LTC6090

LTC6090/LTC6090 -5 - 140V CMOS Rail-to-Rail Output, Picoamp Input Current Op Amp

Document overview

• Manufacturer or author: Linear Technology Corporation
• PDF pages: 26

Technical content

6090feFor more information www.linear .com/L TC6090 TYPICAL APPLICATION FEATURES DESCRIPTION 140V CMOS Rail-to-Rail Output, Picoamp Input Current Op Amp The LT C®6090/LTC6090-5 are high voltage, precision monolithic operational amplifiers. The LTC6090 is unity gain stable. The LTC6090-5 is stable in noise gain con- figurations of 5 or greater. Both amplifiers feature high open loop gain, low input referred offset voltage and noise, and pA input bias current and are ideal for high voltage, high impedance buffering and/or high gain configurations. The amplifiers are internally protected against over- temperature conditions. A thermal warning output, TFLAG, goes active when the die temperature approaches 150°C. The output stage may be turned off with the output disable pin OD. By tying the OD pin to the thermal warning output (TFLAG), the part will disable the output stage when it is out of the safe operating area. These pins easily interface to any logic family. Both amplifiers may be run from a single 140V or spit ±70V power supplies and are capable of driving up to 200pF of load capacitance. They are available in either an 8-lead SO or 16-lead TSSOP package with exposed pad for low thermal resistance. 140VP-P Sine Wave Output

APPLICATIONS

n Supply Range: ±4.75V to ±70V (140V) n 0.1Hz to 10Hz Noise: 3.5μVP-P n Input Bias Current: 50pA Maximum n Low Offset Voltage: 1.25mV Maximum n Low Offset Drift: ±5µV/°C Maximum n CMRR: 130dB Minimum n Rail-to-Rail Output Stage n Output Sink and Source: 50mA n 12MHz Gain Bandwidth Product n 21V/µs Slew Rate n 11nV/√Hz Noise Density n Thermal Shutdown n Available in Thermally Enhanced SOIC-8E or TSSOP-16E Packages n ATE n Piezo Drivers n Photodiode Amplifier n High Voltage Regulators n Optical Networking High Voltage DAC Buffer Application VOUT = ±70V

6090 TA01a

–70V16.2k 10k 470pF 16.9k VREF 2.5V L TC2641DIN 25µs/DIV –20 –40 –60 –80

6090 TA01b

OUTPUT VOL TAGE (V) L, LT, LT C, LT M, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.

6090fe For more information www.linear .com/L TC6090 PIN CONFIGURATION ABSOLUTE MAXIMUM RATINGS Input Voltage Input Current TFLAG Output (Note 1) TOP VIEW OD OUT TFLAG COM –IN +IN V S8E PACKAGE 8-LEAD PLASTIC SO TJMAX = 150°C, θJC = 5°C/W EXPOSED PAD (PIN 9) IS V–, MUST BE SOLDERED TO PCB FE PACKAGE 16-LEAD PLASTIC TSSOP TOP VIEW COM GUARD GUARD –IN +IN GUARD GUARD V OD GUARD V GUARD OUT GUARD GUARD TFLAG TJMAX = 150°C, θJC = 10°C/W EXPOSED PAD (PIN 17) IS V–, MUST BE SOLDERED TO PCB ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION JUNCTION TEMPERATURE RANGE LTC6090CS8E#PBF LTC6090CS8E#TRPBF 6090 8-Lead Plastic SO 0°C to 70°C LTC6090IS8E#PBF LTC6090IS8E#TRPBF 6090 8-Lead Plastic SO –40°C to 85°C LTC6090HS8E#PBF LTC6090HS8E#TRPBF 6090 8-Lead Plastic SO –40°C to 125°C LTC6090CFE#PBF LTC6090CFE#TRPBF 6090FE 16-Lead Plastic TSSOP 0°C to 70°C LTC6090IFE#PBF LTC6090IFE#TRPBF 6090FE 16-Lead Plastic TSSOP –40°C to 85°C LTC6090HFE#PBF LTC6090HFE#TRPBF 6090FE 16-Lead Plastic TSSOP –40°C to 125°C Output Current Operating Junction Temperature Range Specified Junction Temperature Range (Note 4)

6090feFor more information www.linear .com/L TC6090 ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications and all typical values are at TJ = 25°C. Test conditions are V+ = 70V, V– = –70V, VCM = VOUT = 0V, VOD = Open unless otherwise noted. ORDER INFORMATION C-, I-SUFFIXES H-SUFFIX SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS VOS Input Offset Voltage l ±330 ±330 ±1000 ±1250 ±330 ±330 ±1000 ±1250 μV μV OS /∆T Input Offset Voltage Drift TA = 25°C, ∆TJ = 70°C –5 ±3 5 –5 ±3 5 µV/°C IB Input Bias Current (Note 6) Supply Voltage = ±70V Supply Voltage = ±15V Supply Voltage = ±15V l 0.3 0.3 800 pA pA pA I OS Input Offset Current (Note 6) Supply Voltage = ±15V l 0.5 0.5 120 pA pA e n Input Noise Voltage Density f = 1kHz f = 10kHz nV/√Hz nV/√Hz Input Noise Voltage 0.1Hz to 10Hz 3.5 3.5 µV P-P in Input Noise Current Density 1 1 fA/√Hz VCM Input Common Mode Range Guaranteed by CMRR l V–+3V ±68 V+–3V V–+3V ±68 V+–3V V V C IN Common Mode Input Capacitance 9 9 pF CDIFF Differential Input Capacitance 5 5 pF CMRR Common Mode Rejection Ratio VCM = –67V to 67V l 130 126 >140 130 126 >140 dB dB PSRR Power Supply Rejection Ratio V S = ±4.75V to ±70V l 112 106 >120 112 106 >120 dB dB V OUT Output Voltage Swing High (VOH) (Referred to V+) No Load I SOURCE = 1mA ISOURCE = 10mA l l l 450 140 1000 450 140 1000 mV mV mV Output Voltage Swing Low (V OL) (Referred to V–) No Load I SINK = 1mA ISINK = 10mA l l l 250 600 250 600 mV mV mV A VOL Large-Signal Voltage Gain RL = 10k, VOUT from –60V to 60V l 1000 1000 >10000 1000 1000 >10000 V/mV V/mV LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION JUNCTION TEMPERATURE RANGE LTC6090CS8E-5#PBF LTC6090CS8E-5#TRPBF 60905 8-Lead Plastic SO 0°C to 70°C LTC6090IS8E-5#PBF LTC6090IS8E-5#TRPBF 60905 8-Lead Plastic SO –40°C to 85°C LTC6090HS8E-5#PBF LTC6090HS8E-5#TRPBF 60905 8-Lead Plastic SO –40°C to 125°C LTC6090CFE-5#PBF LTC6090CFE-5#TRPBF 6090FE-5 16-Lead Plastic TSSOP 0°C to 70°C LTC6090IFE-5#PBF LTC6090IFE-5#TRPBF 6090FE-5 16-Lead Plastic TSSOP –40°C to 85°C LTC6090HFE-5#PBF LTC6090HFE-5#TRPBF 6090FE-5 16-Lead Plastic TSSOP –40°C to 125°C Consult LT C Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/. Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix.

6090fe For more information www.linear .com/L TC6090 ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications and all typical values are at TJ = 25°C. Test conditions are V+ = 70V, V– = –70V, VCM = VOUT = 0V, VOD = Open unless otherwise noted. C-, I-SUFFIXES H-SUFFIX SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS ISC Output Short-Circuit Current (Source and Sink) Supply Voltage = ±70V Supply Voltage = ±15V l 90 mA mA SR Slew Rate A V = –4, RL = 10k LTC6090 LTC6090-5 l l V/μs V/μs GBW Gain-Bandwidth Product f TEST = 20kHz, RL = 10k LTC6090 LTC6090-5 l l 5.5 MHz MHz Φ M Phase Margin RL = 10k, CL = 50pF 60 60 Deg FPBW Full Power Bandwidth VO = 125VP–P LTC6090 LTC6090-5 l l kHz kHz t S Settling Time 0.1% ∆VOUT = 1V LTC6090, AV = 1V/V LTC6090-5, AV = 5V/V 2.5 2.5 µs µs I S Supply Current No Load l 2.8 3.9 4.3 2.8 3.9 4.3 mA mA V S Supply Voltage Range Guaranteed by the PSRR Test l 9.5 140 9.5 140 V ODH ODL OD Pin Voltage, Referenced to COM Pin V IH VIL l l COM+1.8V COM+0.65V COM+1.8V COM+0.65V V V Amplifier DC Output Impedance, Disabled DC, OD = COM >10 >10 MΩ COM CM COM Pin Voltage Range l V– V+ – 5 V– V+ – 5 V COMV COM Pin Open Circuit Voltage l 17 21 25 17 21 25 V COMR COM Pin Resistance l 500 665 850 500 665 850 kΩ TEMPF Die Temperature Where TFLAG Is Active 145 145 °C TEMP HYS TFLAG Output Hysteresis 5 5 °C ITFLAG TFLAG Pull-Down Current TFLAG Output Voltage = 0V l 70 200 330 70 200 330 µA Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: The LTC6090/LTC6090-5 is capable of producing peak output currents in excess of 50mA. Current density limitations within the IC require the continuous RMS current supplied by the output (sourcing or sinking) over the operating lifetime of the part be limited to under 50mA (Absolute Maximum). Proper heat sinking may be required to keep the junction temperature below the absolute maximum rating. Refer to Figure 7, the Power Dissipation section, and the Safe Operating Area section of the data sheet for more information. Note 3: The LTC6090C/LTC6090I are guaranteed functional over the operating junction temperature range –40°C to 85°C. The LTC6090H is guaranteed functional over the operating junction temperature range –40°C to 125°C. Specifying the junction temperature range as an operating condition is applicable for devices with potentially significant quiescent power dissipation. Note 4: The LTC6090C is guaranteed to meet specified performance from 0°C to 70°C. The LTC6090C is designed, characterized, and expected to meet specified performance from –40°C to 85°C but is not tested or QA sampled at these temperatures. The LTC6090I is guaranteed to meet specified performance from –40°C to 85°C. The LTC6090H is guaranteed to meet specified performance from –40°C to 125°C. Note 5: This device includes over temperature protection that is intended to protect the device during momentary overload conditions. Operation above the specified maximum operating junction temperature is not recommended. Note 6: Input bias and offset current is production tested with ±15V supplies. See Typical Performance Characteristics curves of actual typical performance over full supply range.

6090feFor more information www.linear .com/L TC6090 TYPICAL PERFORMANCE CHARACTERISTICS FREQUENCY (kHz) CMRR (dB)

6090 G02

0.1 1000101 100VS = ±70V L TC6090-5 L TC6090 LTC6090 LTC6090 LTC6090-5 LTC6090-5 FREQUENCY (kHz) PSRR (dB)

6090 G03

0.1 1000101 100 PSRR– PSRR+ AV = 1V/V FREQUENCY (kHz) GAIN (dB) PHASE (DEG)

6090 G01

–20 100 –40 –20 0.1 1000010010 1 1000 PHASE GAIN LTC6090-5 LTC6090 TCVOS (µV/°C) NUMBER OF UNITS

6090 G05

–6 –4 2 0 –2 6 4 VS = ±70V TA = 25°C ∆TJ = 70°C VCM = 0V INPUT COMMON MODE VOL TAGE (V) CHANGE IN OFFSET VOL TAGE (µV)

6090 G06

–20 –10 –75 0 –25 –50 75 50 25 SPECIFIED COMMON MODE RANGE= ±67V VS = ±70V 125°C 85°C 25°C –50°C TEMPERATURE (°C) –50 –500 VOLTAGE OFFSET (µV) –400 –200 –100 500 200 0 50 75 100

6090 G07

–300 300 400 100 –25 25 125 VS = ±70V VCM = 0V

5 SAMPLES

TOTAL SUPPLY VOLTAGE (V) –500 OFFSET VOLTAGE (µV) –300 –100 100 30 55 80 105

6090 G08

–400 –200 200 400 TA = 25°C V+ = – V – VCM = 0V TOTAL SUPPLY VOLTAGE (V) CHANGE IN OFFSET VOLTAGE (µV) –25 8 10

6090 G09

–50 –75 –100 6 7 9 100 125°C 85°C 25°C –50°C VOS (µV) NUMBER OF UNITS

6090 G04

–1000 10005000–500 VS = ±70V TA = 25°C VCM = 0V Open Loop Gain and Phase vs Frequency CMRR vs Frequency PSRR vs Frequency VOS Distribution TCVOS Distribution Change in Offset Voltage vs Input Common Mode Voltage Offset Voltage vs Temperature Offset Voltage vs Total Supply Voltage Minimum Supply Voltage

6090fe For more information www.linear .com/L TC6090 TYPICAL PERFORMANCE CHARACTERISTICS FREQUENCY (kHz) VOL TAGE NOISE DENSITY (nV/√Hz) 100 0.001 0.1 1 10010

6090 G13

0.010 1000 FREQUENCY (kHz) INTEGRATED NOISE (µVRMS) 150 200 250 100 1000 10000

6090 G14

FREQUENCY (kHz) GAIN (dB)

6090 G15

RF = 40.2k RI = 10k CF = 2pF FREQUENCY (kHz) GAIN (dB)

6090 G16

–10 1 10000100010010 RF = 40.2k RI = 10k CF = 2pF CF = 1pF CF = 0pF FREQUENCY (kHz) GAIN (dB) 1 100 1000 10000

6090 G17

–20 –10 AV = 101V/V AV = 11V/V AV = 1V/V FREQUENCY (kHz) GAIN (dB)

6090 G18

–10 1 10000100010010 5V/V 11V/V 33V/V 101V/V TEMPERATURE (°C) –50 SUPPLY CURRENT (mA) 2.8 2.9 3.0 25 75

6090 G10

2.7 2.6 –25 0 50 100 125 2.5 2.4 VS = ±70V VS = ±4.75V SUPPLY VOLTAGE (V) SUPPLY CURRENT (mA) 0.5 1.0 1.5 2.0 3.0 25 50 75 100

6090 G11

2.5 TA = 25°C TOTAL SUPPLY VOLTAGE (V) OUTPUT DISABLE CURRENT (µA) 400

6090 G12

125°C 85°C 25°C –50°C Integrated Noise vs Frequency Small Signal Frequency Response LTC6090-5 Small Signal Frequency Response vs Feedback Capacitance LTC6090 Small Signal Frequency Response vs Closed Loop Gain LTC6090-5 Small Signal Frequency Response vs Closed Loop Gain Voltage Noise Density vs Frequency Supply Current vs Temperature Supply Current vs Total Supply Voltage Output Disable Supply Current vs Total Supply Voltage

6090feFor more information www.linear .com/L TC6090 TYPICAL PERFORMANCE CHARACTERISTICS FREQUENCY (kHz) 0.1 OUTPUT IMPEDACNE (/uni03A9) 100 1000 1 100 1000 100000

6090 G19

0.01 10 10000 AV = 101V/V AV = 11V/V AV = 1V/V FREQUENCY (kHz) OUTPUT IMPEDANCE (k/uni03A9) 100 1000 10 100

6091 G20

CL = 10pF COMMON MODE VOLTAGE (V) INPUT BIAS CURRENT (|pA|) 100 –80 0 40

6090 G21

–40 –60 20 60–20 80 125°CVS = ±70V 100°C 80°C 50°C DIRECTION OF THE CURRENT IS OUT OF THE PIN 25°C 5°C 0.1 1000 10000 COMMON MODE VOLTAGE (V) INPUT BIAS CURRENT (|pA|) 100 1000 –15 5 15

6090 G22

0.1 –5 –10 100 125°C 100°C VS = ±15V 50°C 25°C 85°C DIRECTION OF THE CURRENT IS OUT OF THE PIN OUTPUT, INPUT (V)

6090 G23

–20 –40 –80 5µs/DIV –60 INPUT OUTPUT AV = –10V/V VS = ±70V OUTPUT, INPUT (V)

6090 G24

–20 –40 –80 5µs/DIV –60 INPUT OUTPUT AV = –10V/V VS = ±70V RF = 100k/uni03A9 RI = 10k/uni03A9 CF = 2pF INPUT 50mV/DIV OUTPUT 50mV/DIV 1µs/DIV AV = 1V/V INPUT STEP (0.5V/DIV) OUTPUT STEP (20mV/DIV) 500ns/DIV

6090 G26

AV = 1V/V INPUT OUTPUT INPUT STEP (0.5V/DIV) OUTPUT STEP (20mV/DIV) 500ns/DIV

6090 G27

AV = 1V/V INPUT OUTPUT LTC6090-5 Large Signal Transient Response Small Signal Transient Response LTC6090 Falling Edge Settling Time LTC6090 Rising Edge Settling Time Input Bias Current vs Common Mode Voltage and Temperature Input Bias Current vs Common Mode Voltage and Temperature LTC6090 Large Signal Transient Response Output Impedance vs Frequency Output Impedance vs Frequency with Output Disabled (OD = COM)

6090fe For more information www.linear .com/L TC6090 TYPICAL PERFORMANCE CHARACTERISTICS 0.1Hz to 10Hz Voltage Noise Supply Current vs OD Pin Voltage OD Pin Input Current vs OD Pin Voltage Output Voltage Swing High (VOH) vs Load Current and Temperature LTC6090-5 Falling Edge Settling Time Output Disable (OD) Response Time Output Voltage Swing vs Frequency LTC6090-5 Small Signal Transient Response LTC6090-5 Rising Edge Settling Time 1µs/DIV INPUT 25mV/DIV OUTPUT 100mV/DIV

6090 G28

AV = 5V/V RF = 40.2k/uni03A9 RI = 10k/uni03A9 CF = 2pF 500ns/DIV INPUT (100mV/DIV) OUTPUT (50mV/DIV)

6090 G29

AV = 5V/V RF = 40.2k/uni03A9 RI = 10k/uni03A9 CF = 2pF INPUT OUTPUT 500ns/DIV INPUT (100mV/DIV) OUTPUT (50mV/DIV)

6090 G30

AV = 5V/V RF = 40.2k/uni03A9 RI = 10k/uni03A9 CF = 2pF

6090 G3120µs/DIV

= 0V 2V/DIV OUTPUT ENABLED OUTPUT DISABLED VOUT = 0V AV = –10V/V VIN = –0.5V VOUT FREQUENCY (kHz) VOUT (VP-P)

6090 G32

AV = –10V/V VS = ±70V RF = 100k/uni03A9 RI = 10k/uni03A9 CF = 2pF TIME (1s/DIV) OUTPUT NOISE 2µV/DIV

6090 G33

OD-COM (V) 0.5 SUPPLY CURRENT (mA) 0.5 1.0 1.5 2.0 3.0 0.8 1.0 1.3 1.5

6090 G34

1.8 2.0 2.5 125°C 85°C 25°C –50°C VS = ±70V VCOM = 0V OD-COM (V) 0 1 –50 OD INPUT CURRENT (µA) –25 2 6 3 4 5 7

6090 G35

125°C 85°C 25°C –50°C VS = ±70V VCOM = 0V ISOURCE (mA) VOH (mV) 300 400 500 6 10

6090 G36

800 125°C 85°C 25°C –50°C

6090feFor more information www.linear .com/L TC6090 TYPICAL PERFORMANCE CHARACTERISTICS Output Voltage Swing Low (VOL) vs Load Current and Temperature Open Circuit Voltage of COM, OD, TFLAG LTC6090 Distortion vs Frequency Open Loop Gain Thermal Shutdown Hysteresis Open Loop Gain vs Load Resistance ISOURCE (mA) VOL (mV) 150 200 250 6 10

6090 G37

125°C 85°C 25°C –50°C FREQUENCY (kHz) DISTORTION (dBc)

6090 G38

–20 –120 –110 –100 –90 –50 –40 –30 –80 –70 –60 10 100 VS = ±70V AV = 10 VOUT = 10VP-P RL = 10k 2ND 3RD JUNCTION TEMPERATURE (°C) SUPPL Y CURRENT (mA)

6090 G39

3.0 0.5 1.0 2.5 2.0 1.5 162 178170166 164 168 176 174 172 TOTAL SUPPL Y VOL TAGE (V) PIN VOL TAGE (V)

6090 G40

V– = 0V OUTPUT VOL TAGE (V) CHANGE IN VOL TAGE OFFSET (µV)

6090 G41

–40 –30 –20 –10 –70 –50 –25 0 25 50 75 VS = ±70V RLOAD = 10k TA = 25°C

10 SAMPLES

OUTPUT VOL TAGE (V) CHANGE IN VOL TAGE OFFSET (µV)

6090 G42

–40 –30 –20 –10 –70 –50 –25 0 25 50 75 RLOAD = 100k RLOAD = 10k RLOAD = 500k

6090fe For more information www.linear .com/L TC6090 PIN FUNCTIONS COM (Pin 1/Pin 1): COM Pin is used to interface OD and TFLAG pins to voltage control circuits. Tie this pin to the low voltage ground, or let it float. –IN (Pin 2/Pin 4): Inverting Input Pin. Input common mode range is V– + 3V to V+ – 3V. Do not exceed absolute maximum voltage range. +IN (Pin 3/Pin 5): Noninverting Input Pin. Input common mode range is V– + 3V to V+ – 3V. Do not exceed absolute maximum voltage range. V – (Pin 4, Exposed Pad Pin 9/Pin 8, Exposed Pad Pin 17): Negative Supply Pin. Connect to V– Only. To achieve low thermal resistance connect this pin to the V– power plane. The V– power plane connection removes heat from the device and should be electrically isolated from all other power planes. TFLAG (Pins 5, 9/Pins 9, 17): Temperature Flag Pin. The TFLAG pin is an open drain output that sinks current when the die temperature exceeds 145°C. OUT (Pin 6/Pin 12): Output Pin. If this rail-to-rail output goes below V– , the ESD protection diode will forward bias. If OUT goes above V+, then output device diodes will forward bias. Avoid forward biasing the diodes on the OUT pin. Excessive current can cause damage. V+ (Pin 7/Pin 14): Positive Supply Pin. OD (Pin 8/Pin 16): Output Disable Pin. Active low input disables the output stage. If left open, an internal pull-up resistor enables the amplifier. Input voltage levels are referred to the COM pin. GUARD (NA/Pins 2, 3, 6, 7, 10, 11, 13, 15): Guard pins increase clearance and creepage between other pins. Pins 3 and 6 can be used to build guard rings around the inputs. (S8E/FE)

6090feFor more information www.linear .com/L TC6090 BLOCK DIAGRAM 6090 BD TJ > 175°C TJ > 145°C – + 10k COM –IN +IN 10k DIFFERENTIAL DRIVE GENERATOR OUTPUT ENABLE 500Ω TO COM PIN DIE TEMPERATURE SENSOR INPUT STAGE 125/uni03A9 125/uni03A9 OD TFLAG OUT ESD ESD ESD ESD ESD ESD 1.2V

6090fe For more information www.linear .com/L TC6090 General The LTC6090 high voltage operational amplifier is designed in a Linear Technology proprietary process enabling a rail- to-rail output stage with a 140V supply while maintaining precision, low offset, and low noise. Power Supply The LTC6090 works off single or split supplies. Split sup- plies can be balanced or unbalanced. For example, two ±70V supplies can be used, or a 100V and –40V supply can be used. For single supply applications place a high quality surface mount ceramic 0.1µF bypass capacitor between the supply pins close to the part. For dual supply applications use two high quality surface mount ceramic capacitors between V+ to ground, and V– to ground located close to the part. When using split supplies, supply se- quencing does not cause problems. Input Protection As shown in the block diagram, the LTC6090 has a com- prehensive protection network to prevent damage to the input devices. The current limiting resistors and back to back diodes are to keep the inputs from being driven apart. The voltage-current relationship combines exponential and resistive until the voltage difference between the pins reach 12V. At that point the Zeners turn on. Additional current into the pins will snap back the input differential voltage to 9V. In the event of an ESD strike between an input and V–, the voltage clamps and ESD device fire providing a current path to V– protecting the input devices. The input pin protection is designed to protect against momentary ESD events. A repetitive large fast input swing (>5.5V and <20ns rise time) will cause repeated stress on the MOSFET input devices. When in such an application, anti-parallel diodes (1N4148) should be connected between the inputs to limit the swing. Feedback Resistor Selection To get the most accuracy, the feedback resistor should be chosen carefully. Consider an amplifier with AV = –50 and a 5k feedback resistor. A 1V input will cause the output to Figure 1. Low Voltage Interface APPLICATIONS INFORMATION rise to 50V, causing 10mA to flow through the feedback resistor. The power dissipated in the output stage will create thermal feedback to the input stage potentially causing shifts in offset voltage. A better choice is a 50k feedback resistor reducing the current in the feedback resistor to 1mA. Interfacing to Low Voltage Circuits The COM pin is provided to set a common signal ground for communication to a microprocessor or other low volt- age logic circuit. The COM pin should be tied to the low voltage ground as shown in Figure 1. If left floating, the internal resistive voltage divider will cause the COM pin to rise 30% above mid-supply. The COM, OD, and TFLAG pins are protected from overvoltage by internal Zener diodes and current limiting resistors. Extra care should be taken to observe the absolute maximum voltage limits between (OD and COM) and between (TFLAG and COM). Voltage limits between these pins must remain between –3V and 7V.

6090 F01

Figure 2. Starting Up Figure 3. LTC6090 Output Disable Function

6090 F02

6090 F03

or an open drain NMOS device as shown in Figure 1. coming out of shutdown, respectively. ensure the junction temperature does not exceed 150°C. of the device exceeds 150°C. Figure 4. Automatic Thermal Output

6090 F04

6090fe For more information www.linear .com/L TC6090 APPLICATIONS INFORMATION Board Layout The LTC6090 is a precision low offset high gain ampli- fier that requires good analog PCB layout techniques to maintain high performance. Start with a ground plane that is star connected. Pull back the ground plane from any high voltage vias. Critical signals such as the inputs should have short and narrow PCB traces to reduce stray capacitance which also improves stability. Use high quality surface mount ceramic capacitors to bypass the supply(s). In addition to the typical layout issues encountered with a precision operational amplifier, there are the issues of high voltage and high power. Important consideration for high voltage traces are spacing, humidity and dust. High voltage electric fields between adjacent conductors attract dust. Moisture is absorbed by the dust and can contribute to board leakage and electrical breakdown. It is important to clean the PCB after soldering down the part. Solder flux will accumulate dust and become a leak- age hazard. It is recommended to clean the PCB with a solvent, or simply use soap and water to remove residue. Baking the PCB will remove left over moisture. Depending on the application, a special low leakage board material may be considered. The TSSOP package has guard pins for applications that require a guard ring. An example schematic diagram and PCB layout is shown in Figures 5a and 5b, respectively, of a circuit using a guard ring to protect the –IN pin. The guard ring completely encloses the high impedance node –IN. To simplify the PCB layout avoid using vias on this node. In addition, the solder mask should be pulled back along the guard ring exposing the metal. To help the spacing between nodes, one of the extra pins on the TSSOP package is used to route the guard ring behind the –IN pin. The PCB should be thoroughly cleaned after soldering to ensure there is no solder paste between the exposed pad (Pin 17) and the guard ring.

6090 F05a

Figure 5a. Circuit Diagram Showing Guard Ring Figure 5b. TSSOP Package PCB Layout with Guard Ring

6090 F05b

R1–IN +IN OUT

junction to ambient thermal resistance down to 33°C/W. θJA could be as high 120°C/W. Table 1. Thermal Resistance as PCB Area of Exposed Pad Varies as a function of metal area connected to the exposed pad. The LTC6090 is specified to source and sink 10mA at 140V. increase due to power dissipation.

Figure 8. Closed Loop Response with Figure 7. LTC6090 with Feedback Capacitance Figure 6. Safe Operating Area

6090 F07

6090 F06

6090 F08

Figure 6 show the direct effect of θJA on SOA. stability and causes peaking in the closed loop response. closed loop response with various feedback capacitors. traces should be routed as short and narrow as possible.

settling, stray capacitance should be kept to a minimum. board, supply voltage and load conditions. Slewing is a nonlinear behavior and will affect distortion. width is given in the relationship below. versus frequency for several output levels. Figure 10. Multiplexer Application Figure 9. Distortion vs Frequency for Large Output Swings

6090 F09

6090 F10

6090fe For more information www.linear .com/L TC6090 TYPICAL APPLICATIONS Gain of 20 Amplifier with a 40mA Protected Output Driver Gain of 10 with Protected Output Current Doubler 12V to ±70V Isolated Flyback Converter for Amplifier Supply

6090 TA04

2.2nF 24.9k 10k BAV20W BZX100A EN/UVLO 4.7µF 100k 562k

• CRM1U-06M CRM1U-06M 0.47µF 100V 0.47µF 100V 2.2µF VOUT1+ VOUT2– L TC6090 70V –70V 750311692 1:1:5

6090 TA05

• CMMR1U-2 750311692 1:1:5 CMMR1U-2 CMHZ5266B 1µF 100V 1µF 130V L TC6090 65V –65V 4.7µF 130k EN/UVLO GND R FB VIN SW L T8300 9V to ±65V Isolated Flyback Converter for Amplifier Supply

6090 TA03

–70V 200k 200k TF OD 22.1k VIN 100/uni03A9 L TC6090 70V –70V TF OD 100/uni03A9 ±70V AT ±20mA

6090 TA02

–70V 12.1/uni03A9 40.2k TF OD VOUT CZT5401 CZT5551 2k 40.2k VIN

6090feFor more information www.linear .com/L TC6090 TYPICAL APPLICATIONS Audio Power Amplifier FREQUENCY (Hz) TOTAL HARMONIC DISTORTION PLUS NOISE (%)

6090 TA06b

0.100 0.001 0.010 10 100 100000100001000 8/uni03A9 AT 50W 4/uni03A9 AT 100W Total Harmonic Distortion Plus Noise Analyzer Passband 10Hz to 80kHz L T1166 VTOP SENSE+ VBOTTOM SENSE– VIN VOUT ILIM+ 100k 100pF ILIM– L TC6090 100pF 100k 10Ω 0.1/uni03A9 IXTH50N20 IXTH24P20

6090 TA06a

0.1/uni03A9 33.2k 40.2/uni03A91nF 2.49k CZT5551 1N4148 CZT5401 1N4148 * USE SEVERAL SERIES RESISTORS TO REDUCE DISTORTION (i.e. 5 × 2k/uni03A9). 33.2k 10k* 1nF 100pF 1N41481N4148 39.2/uni03A9 20k IN 499/uni03A9 499Ω 1nF 7 5 –50V 50V 100pF 1µF 1µF 1N4148 1N4148 22nF 1µH

6090fe For more information www.linear .com/L TC6090 TYPICAL APPLICATIONS High Current Pulse Amplifier 60V Step Response Into 10Ω 5µs/DIV VOL TS

6090 TA07b

–20 –10 L TC6090

6090 TA07

499Ω 499Ω 10k IN 4 9 7 5 499/uni03A9 –70V 70V 2SK1057 2SJ161 10k 75pF 100/uni03A9 IHSM-3825 1µH

6090feFor more information www.linear .com/L TC6090 L TC6090

6090 TA08a

499Ω 10k IN 4 9 7 5 100Ω 100nF 100nF 499/uni03A9 –50V 50V 2SK1057 2SJ1612SJ161 2k 2k 2k 50pF 2k 2k IHSM-3825 1µH 2SK1057 100/uni03A9 SET QUIESCENT SUPPL Y CURRENT AT ABOUT 200mA WITH BIAS ADJUSTMENT . SET QUIESCENT CURRENT TO 100mA IF PARALLEL MOSFETs ARE NOT USED (FOR 8/uni03A9 OR HIGHER). 100k 100k 6.8k BIAS 10k 6.8k FREQUENCY (Hz) TOTAL HARMONIC DISTORTION PLUS NOISE (%)

6090 TA08b

0.0001 0.001 0.01 0.1 10k1k100 8/uni03A9 AT 50W 4/uni03A9 AT 100W TYPICAL APPLICATIONS Simple 100W Audio Amplifier Total Harmonic Distortion Plus Noise vs Frequency

6090fe For more information www.linear .com/L TC6090 TYPICAL APPLICATIONS Wide Common Mode Range 10x Gain Instrumentation Amplifier Typically <1mV Input-Referred Error L TC6090 205k 10k* 22pF4 9 7 5 L TC6090 4 9 7 5 24.9k 100k 100k –70V 70V –70V 70V * THESE RESISTORS CAN BE 0/uni03A9 IF INPUT SIGNAL SOURCE IMPEDANCES ARE <20M/uni03A9. 22pF 10k* L TC6090 100k L T5400-2 100k 100k 100k 4 9 7 5 22pF 22pF+IN –IN 70V –70V L TC6090 TA09 49.9/uni03A9 OUT –3dB at 45kHz CM FREQUENCY (kHz) CMRR (dB)

6090 TA09b

6090feFor more information www.linear .com/L TC6090 PACKAGE DESCRIPTION Please refer to http://www.linear.com/product/LTC6090#packaging for the most recent package drawings. FE16 (BA) TSSOP REV K 0913 0.09 – 0.20 (.0035 – .0079) 0° – 8° 0.25 REF 0.50 – 0.75 (.020 – .030) 4.30 – 4.50* (.169 – .177) 1 3 4 5 6 7 8 10 9 4.90 – 5.10* (.193 – .201) 16 1514 13 12 11 1.10 (.0433) MAX 0.05 – 0.15 (.002 – .006) 0.65 (.0256) BSC 2.74 (.108) 2.74 (.108) 0.195 – 0.30 (.0077 – .0118) TYP MILLIMETERS (INCHES) *DIMENSIONS DO NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.150mm (.006") PER SIDE NOTE: 1. CONTROLLING DIMENSION: MILLIMETERS 2. DIMENSIONS ARE IN RECOMMENDED SOLDER PAD LAYOUT 3. DRAWING NOT TO SCALE 0.45 ±0.05

0.65 BSC

4.50 ±0.10 6.60 ±0.10 1.05 ±0.10 2.74 (.108) 2.74 (.108) SEE NOTE 4 4. RECOMMENDED MINIMUM PCB METAL SIZE FOR EXPOSED PAD ATTACHMENT 6.40 (.252) BSC 16-Lead Plastic TSSOP (4.4mm) (Reference LTC DWG # 05-08-1663 Rev K) Exposed Pad Variation BA

6090fe For more information www.linear .com/L TC6090 PACKAGE DESCRIPTION Please refer to http://www.linear.com/product/LTC6090#packaging for the most recent package drawings. .016 – .050 (0.406 – 1.270) .010 – .020 0°– 8° TYP .008 – .010 (0.203 – 0.254) S8E 1015 REV C .053 – .069 (1.346 – 1.752) .014 – .019 (0.355 – 0.483) TYP .004 – .010 (0.101 – 0.254) 0.0 – 0.005 (0.0 – 0.130) .080 – .099 (2.032 – 2.530) .118 – .139 (2.997 – 3.550) .050 (1.270) BSC 1 2 3 4 .150 – .157 (3.810 – 3.988) NOTE 3 8 7 .005 (0.13) MAX 6 5 .189 – .197 (4.801 – 5.004) NOTE 3 .228 – .244 (5.791 – 6.197) .160 ±.005 (4.06 ±0.127) .118 (2.99) REF RECOMMENDED SOLDER PAD LAYOUT .045 ±.005 (1.143 ±0.127) .050 (1.27) BSC INCHES (MILLIMETERS) NOTE: 1. DIMENSIONS IN 2. DRAWING NOT TO SCALE 3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010" (0.254mm) 4. STANDARD LEAD STANDOFF IS 4mils TO 10mils (DATE CODE BEFORE 542) 5. LOWER LEAD STANDOFF IS 0mils TO 5mils (DATE CODE AFTER 542) 8-Lead Plastic SOIC (Narrow .150 Inch) Exposed Pad (Reference LTC DWG # 05-08-1857 Rev C) .089 (2.26) REF .030 ±.005 (0.76 ±0.127) TYP .245 (6.22) MIN 4 5

6090feFor more information www.linear .com/L TC6090 Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.

REVISION HISTORY

REV DATE DESCRIPTION PAGE NUMBER A 11/12 Added ESD Statement. 2 B 9/13 Corrected schematics 16, 17, 18 C 6/14 Added LTC6090-5, Improved specs. All D 5/15 Removed ESD statement to reflect improved ESD performance. Changed internal TFLAG circuit resistor values. Updated Thermal Shutdown description. Corrected application circuit resistor value. 11, 12 19, 20, 21 E 11/15 Corrected resistor values 20, 21

6090fe For more information www.linear .com/L TC6090 Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417  LINEAR TECHNOLOGY CORPORATION 2012 LT 1115 REV E • PRINTED IN USA (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear .com/L TC6090 RELATED PARTS TYPICAL APPLICATION PART NUMBER DESCRIPTION COMMENTS Amplifiers LT1990 ±250V Input Range G = 1, 10, Micropower, Difference Amplifier Pin Selectable Gain of 1 or 10 LT1991 Precision, 100µA Gain Selectable Amplifier Pin Configurable as a Difference Amplifier, Inverting and Noninverting Amplifier Matched Resistors LT5400 Quad Matched Resistor Network Excellent Matching Specifications Over the Entire Temperature Range Digital to Analog Converters LTC2641/LTC2642 16-Bit V OUT DACs in 3mm × 3mm DFN Guaranteed Monotonic Over Temperature LTC2756 Serial 18-Bit SoftSpan IOUT DAC 18-Bit Settling Time: 2.1µs Maximum 18-Bit INL Error: ±1 LSB Over Temperature Flyback Controllers LT3511 Monolithic High Voltage Isolated Flyback Converter 4.5V to 100V Input Voltage Range, No Opto-Coupler Required LT8300 100VIN Micropower Isolated Flyback Converter with 150V/260mA Switch 6V to 100V Input Voltage Range. VOUT Set with a Single External Resistor Extended Dynamic Range 1MΩ T ransimpedance Photodiode Amplifier

6090 TA10

22.1k L TC6090 PHOTODIODE SFH213 125V 0.3pF –3V–3V 10M VOUT VOUT = IPD • 1M OUTPUT NOISE = 21µVRMS (1kHz – 40kHz) OUTPUT OFFSET = 150µV MAXIMUM BANDWIDTH = 40kHz (–3dB) OUTPUT SWING = 0V TO 12V IPD