VCA2618

VCA2618 BURR-BROWN | Alldatasheet

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zzzzz GAIN RANGE: up to 43dB zzzzz 30MHz BANDWIDTH zzzzz LOW CROSSTALK: 65dB at Max Gain, 5MHz zzzzz HIGH-SPEED VARIABLE GAIN ADJUST zzzzz POWER SHUTDOWN MODE zzzzz HIGH IMPEDANCE INPUT BUFFER APPLICA TIONS zzzzz ULTRASOUND SYSTEMS zzzzz WIRELESS RECEIVERS zzzzz TEST EQUIPMENT zzzzz RADAR VCA2618 Dual, VARIABLE GAIN AMPLIFIER with Input Buffer

DESCRIPTION

The VCA2618 is a highly integrated, dual receive channel, Variable Gain Amplifier (VGA) with analog gain control. The VCA2618’s VGA section consists of two parts: the Volt- age Controlled Attenuator (VCA) and the Programmable Gain Amplifier (PGA). The gain and gain range of the PGA can be digitally programmed. The combination of these two program- mable elements results in a variable gain ranging from 0dB up to a maximum gain as defined by the user through external connections. The single-ended unity gain input buffer provides predictable high input impedance. The output of the VGA can be used in either a single-ended or differential mode to drive high-performance Analog-to-Digital (A/D) converters. A sepa- rate power-down pin reduces power consumption. The VCA2618 also features low crosstalk and outstanding distortion performance. The combination of low noise and gain range programmability make the VCA2618 a versa- tile building block in a number of applications where noise performance is critical. The VCA2618 is available in a TQFP-32 package. SBOS254B – JULY 2002 – REVISED NOVEMBER 2003 www.ti.com Copyright © 2002–2003, Texas Instruments IncorporatedPRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. VCA2618 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. Programmable Gain Amplifier Voltage Control Attenuator Buffer Analog Control VCA2618 (1 of 2 Channels) Maximum Gain Select INA VCACNTL CP2A CP1A POUTA NOUTA MGS1 MGS2 MGS3 Maximum Gain Select Programmable Gain Amplifier Voltage Control Attenuator BufferINB CP2B CP1B POUTB NOUTB All trademarks are the property of their respective owners.

VCA26182 SBOS254Bwww.ti.com

ELECTRICAL CHARACTERISTICS

At TA = +25°C, V DD = 5V, load resistance = 500 Ω on each output to ground differential output (2V PP), MGS = 111, and f IN = 5MHz, unless otherwise noted. ELECTROSTATIC DISCHARGE SENSITIVITY This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper han- dling and installation procedures can cause damage. ESD damage can range from subtle performance degrada- tion to complete device failure. Precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications. ABSOLUTE MAXIMUM RATINGS(1) NOTE: (1) Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. Exposure to absolute maximum conditions for extended periods may affect device reliability. SPECIFIED PACKAGE TEMPERATURE PACKAGE ORDERING TRANSPORT PRODUCT PACKAGE-LEAD DESIGNATOR (1) RANGE MARKING NUMBER MEDIA, QUANTITY VCA2618Y TQFP-32 Surface-Mount PBS –40°C to +85°C VCA2618Y VCA2618YT Tape and Reel, 250 "" """ VCA2618YR Tape and Reel, 2000 NOTE: (1) For the most current specifications and package information, refer to our web site at www.ti.com. PACKAGE/ORDERING INFORMATION VCA2618Y PARAMETER CONDITIONS MIN TYP MAX UNITS BUFFER Input Resistance 600 k Ω Input Capacitance 5p F Input Bias Current 1n A Maximum Input Voltage 1V PP Input Voltage Noise PGA Gain = 45dB, R S = 50Ω 5.4 nV/ Hz Input Current Noise Independent of Gain 350 fA/ Hz Noise Figure R F = 550Ω, PGA Gain = 45dB, R S = 75Ω 13 dB Bandwidth 100 MHz PROGRAMMABLE VARIABLE GAIN AMPLIFIER Peak Input Voltage 1V PP –3dB Bandwidth 30 MHz Slew Rate 300 V/µs Output Signal Range R L > 500Ω Each Side to Ground 2.5 ±1 V Output Impedance 1 Ω Output Short-Circuit Current ±40 mA 3rd-Harmonic Distortion V OUT = 2VPP, VCACNTL = 3.0V –45 –50 dBc 2nd-Harmonic Distortion V OUT = 2VPP, VCACNTL = 3.0V –42 –50 dBc 2nd-Harmonic Distortion VOUT = 2VPP, VCACNTL = 3.0V, MGS = 011 –60 dBc Overload Performance (2nd-Harmonic Input Signal = 1V PP, VCACNTL = 2V –40 to –45 dB Distortion) Time Delay 5n s IMD, 2-Tone V OUT = 2VPP, f = 9.95MHz –59 dBc Crosstalk 65 dB Group Delay Variation 1MHz < f < 10MHz, Full Gain Range 13 ns ACCURACY Gain Slope VCA CNTL = 0.2V to 3.0V 16 dB/V Gain Error(1) VCACNTL = 0.2V to 3.0V ±2.0 dB VCACNTL = 0.4V to 2.9V ±1.3 ±2 dB Output Offset Voltage ±50 mV GAIN CONTROL INTERFACE Input Voltage (VCA CNTL) Range 0.2 to 3.0 V Input Resistance 1M Ω Response Time 45dB Gain Change 0.2 µs POWER SUPPLY Specified Operating Range 4.75 5.0 5.25 V Power Dissipation Operating, Each Channel 120 150 mW Power-Down 9.2 mW NOTE: (1) Referenced to best fit dB-linear curve.

SBOS254B www.ti.com 1 +IN A Noninverting Input Channel A

2 NC No Internal Connection

3V DDR Internal Reference Supply 4V BIAS Bias Voltage 5V CM Common-Mode Voltage

6 GND R Internal Reference Ground

7 NC Not Connected

B Noninverting Input Channel B

9 NC No Internal Connection

10 DNC Do Not Connect

P2B Coupling Capacitor Channel B

12 C P1B Coupling Capacitor Channel B

13 V DDB +5V Supply Channel B

14 GND B Ground Channel B

15 P OUTB Positive Output Channel B

16 N OUTB Negative Output Channel B

PIN DESIGNATOR DESCRIPTION PIN DESIGNATOR DESCRIPTION PIN DESCRIPTIONS +INA NC VDDR VBIAS VCM GNDR NC +INB VCACNTL MGS3 MGS2 MGS1 PD NC NC DNC VCA2618 NC DNC C P2B CP1B VDDB GNDB POUTB NOUTB NC DNC C P2A CP1A VDDA GNDA POUTA NOUTA

17 DNC Do Not Connect

18 NC No Internal Connection

19 NC No Internal Connection

20 PD Power-Down (Active LOW)

21 MGS 1 Maximum Gain Select 1 (MSB)

22 MGS 2 Maximum Gain Select 2

23 MGS 3 Maximum Gain Select 3 (LSB)

24 VCA CNTL VCA Analog Control

25 N OUTA Negative VCA Output Channel A

26 P OUTA Positive VCA Output Channel A

27 GND A Ground Channel A

28 V DDA +5V Supply Channel A

29 C P1A Coupling Capacitor Channel A

30 C P2A Coupling Capacitor Channel A

31 DNC Do Not Connect

32 NC No Internal Connection

VCA26184 SBOS254Bwww.ti.com TYPICAL CHARACTERISTICS At TA = +25°C, V DD = 5V, load resistance = 500 Ω on each output to ground, differential output (2V PP) MGS = 111, and f IN = 5MHz, unless otherwise noted. GAIN vs VCA VCACNTL (V) Gain (dB) MGS = 111 MGS = 001 MGS = 011 MGS = 010 MGS = 110 MGS = 101 MGS = 100 GAIN ERROR vs TEMPERATURE VCACNTL (V) Gain Error (dB) 2.0 1.5 1.0 0.5 –0.5 –1.0 –1.5 –2.0 +25°C –40°C +85°C GAIN ERROR vs VCACNTL VCACNTL (V) Gain Error (dB) 2.5 2.0 1.5 1.0 0.5 –0.5 –1.0 –1.5 –2.0 –2.5 10MHz 5MHz 1MHz GAIN ERROR vs VCACNTL VCACNTL (V) Gain Error (dB) 2.5 2.0 1.5 1.0 0.5 –0.5 –1.0 –1.5 –2.0 –2.5 MGS = 001 MGS = 011 MGS = 111 GAIN MATCH: CHA to CHB, VCACNTL = 0.2V Delta Gain (dB) Units –0.36 –0.30 –0.24 –0.18 –0.12 –0.06 0.06 0.12 0.18 0.24 0.30 0.36 0.42 0.48 0.54 0.60 0.66 0.72 0.78 0.84 0.90 GAIN MATCH: CHA to CHB, VCACNTL = 3.0V Delta Gain (dB) Units –0.07 –0.06 –0.05 –0.04 –0.03 –0.02 –0.01 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.10 0.11 0.12 0.13 0.14 0.15 0.16 0.17 0.18

SBOS254B www.ti.com TYPICAL CHARACTERISTICS (Cont.) At TA = +25°C, V DD = 5V, load resistance = 500 Ω on each output to ground, differential output (2V PP) MGS = 111, and f IN = 5MHz, unless otherwise noted. GAIN vs FREQUENCY (VCACNTL = 3.0V) Frequency (Hz) 100k 1M 10M 100M Gain (dB) MGS = 111 MGS = 011 MGS = 001 GAIN vs FREQUENCY Frequency (Hz) 100k 1M 10M 100M Gain (dB) –10 VCACNTL = 3.0V VCACNTL = 1.6V VCACNTL = 0.2V OUTPUT REFERRED NOISE vs VCACNTL VCACNTL (V) Noise (nV/√Hz) 500 450 400 350 300 250 200 150 100 MGS = 111 MGS = 011 RS= 50Ω INPUT REFERRED NOISE vs VCACNTL VCACNTL (V) Noise (nV/√Hz) 600 550 500 450 400 350 300 250 200 150 100 MGS = 111 MGS = 011 RS= 50Ω INPUT REFERRED NOISE vs RS RS (Ω) 1 10 100 1k Noise (nV√Hz) 100 NOISE FIGURE vs RS RS (Ω) 10 100 1k Noise Figure (dB)

VCA26186 SBOS254Bwww.ti.com TYPICAL CHARACTERISTICS (Cont.) At TA = +25°C, V DD = 5V, load resistance = 500 Ω on each output to ground, differential output (2V PP) MGS = 111, and f IN = 5MHz, unless otherwise noted. NOISE FIGURE vs VCACNTL VCACNTL (V) Noise Figure (dB) HARMONIC DISTORTION vs FREQUENCY (Differential, 2Vp-p, MGS = 001) Frequency (Hz) 100k 1M 10M Harmonic Distortion (dBc) –30 –35 –40 –45 –50 –55 –60 –65 –70 VCACNTL = 0.2V, H2 VCACNTL = 0.2V, H3 VCACNTL = 3.0V, H2 VCACNTL = 3.0V, H3 HARMONIC DISTORTION vs FREQUENCY (Differential, 2Vp-p, MGS = 011) Frequency (Hz) 100k 1M 10M Harmonic Distortion (dBc) –30 –35 –40 –45 –50 –55 –60 –65 –70 –75 –80 –85 –90 VCACNTL = 0.2V, H2 VCACNTL = 0.2V, H3 VCACNTL = 3.0V, H2 VCACNTL = 3.0V, H3 HARMONIC DISTORTION vs FREQUENCY (Differential, 2Vp-p, MGS = 111) Frequency (MHz) 100k 1M 10M Harmonic Distortion (dBc) –30 –35 –40 –45 –50 –55 –60 –65 –70 –75 –80 VCACNTL = 0.2V, H2 VCACNTL = 0.2V, H3 VCACNTL = 3.0V, H2 VCACNTL = 3.0V, H3 HARMONIC DISTORTION vs FREQUENCY (Single-Ended, 1Vp-p, MGS = 001) Frequency (Hz) 100k 1M 10M Harmonic Distortion (dBc) –30 –35 –40 –45 –50 –55 –60 –65 –70 –75 –80 –85 –90 VCACNTL = 0.2V, H2 VCACNTL = 0.2V, H3 VCACNTL = 3.0V, H2 VCACNTL = 3.0V, H3 HARMONIC DISTORTION vs FREQUENCY (Single-Ended, 1Vp-p, MGS = 011) Frequency (Hz) 100k 1M 10M Harmonic Distortion (dBc) –30 –35 –40 –45 –50 –55 –60 –65 –70 –75 –80 –85 –90 VCACNTL = 0.2V, H2 VCACNTL = 0.2V, H3 VCACNTL = 3.0V, H2 VCACNTL = 3.0V, H3

SBOS254B www.ti.com TYPICAL CHARACTERISTICS (Cont.) At TA = +25°C, V DD = 5V, load resistance = 500 Ω on each output to ground, differential output (2V PP) MGS = 111, and f IN = 5MHz, unless otherwise noted. CROSS TALK vs FREQUENCY (Differential, 2Vp-p, MGS = 011) Frequency (MHz) 1 6 11 16 21 Cross Talk (dB) –10 –20 –30 –40 –50 –60 –70 –80 –90 VCACNTRL = 1.5V VCACNTRL = 0V VCACNTRL = 3.0V HARMONIC DISTORTION vs VCACNTL (Single-Ended, 1Vp-p) VCACNTL (V) Harmonic Distortion (dBc) –10 –15 –20 –25 –30 –35 –40 –45 –50 –55 –60 –65 –70 –75 MGS = 001, H2 MGS = 011, H2 MGS = 111, H2 MGS = 001, H3 MGS = 011, H3 MGS = 111, H3 HARMONIC DISTORTION vs VCACNTL (Differential, 2Vp-p) VCACNTL (V) Harmonic Distortion (dBc) –10 –15 –20 –25 –30 –35 –40 –45 –50 –55 –60 –65 –70 –75 –80 MGS = 001, H2 MGS = 011, H2 MGS = 111, H2 MGS = 001, H3 MGS = 011, H3 MGS = 111, H3 HARMONIC DISTORTION vs FREQUENCY (Single-Ended, 1Vp-p, MGS = 111) Frequency (Hz) 100k 1M 10M Harmonic Distortion (dBc) –30 –35 –40 –45 –50 –55 –60 –65 –70 –75 –80 –85 –90 VCACNTL = 0.2V, H2 VCACNTL = 0.2V, H3 VCACNTL = 3.0V, H2 VCACNTL = 3.0V, H3 INTERMODULATION DISTORTION (Single-Ended, 1Vp-p, fIN = 10MHz, VCACNTL = 3.0V) Frequency (MHz) Amplitude (dB) –10 –20 –30 –40 –50 –60 –70 –80 –90 –100 INTERMODULATION DISTORTION (Differential, 2Vp-p, fIN = 10MHz, VCACNTL = 3.0V) Frequency (MHz) Amplitude (dB) –10 –20 –30 –40 –50 –60 –70 –80 –90 –100

VCA26188 SBOS254Bwww.ti.com TYPICAL CHARACTERISTICS (Cont.) At TA = +25°C, V DD = 5V, load resistance = 500 Ω on each output to ground, differential output (2Vp-p) MGS = 111, and f IN = 5MHz, unless otherwise noted. GROUP DELAY (1MHz Aperture) Frequency (Hz) 1M 10M 100M Group Delay (ns) VCACNTL = 3.0V VCACNTL = 0.2V I CC vs TEMPERATURE Temperature (°C) –40 –10 5–25 35 50 20 65 80 95 ICC (mA) OVERLOAD DISTORTION vs FREQUENCY Frequency (Hz) 1M 10M 2nd-Harmonic Distortion (dBc) –10 –20 –30 –40 –50 –60 0.1V 0.25V 0.5V

FIGURE 4. Piecewise Approximation to Logarithmic Control Characteristics.

Figure 5 shows a simplified circuit diagram of the PGA block. where CEXTERNAL is the external capacitor value in farads. capacitor, as this can increase the power-on delay time.

000 Not Valid Not Valid

FIGURE 5. Simplified Block Diagram of the PGA Section with the VCA2618. The VCA2618 is an analog amplifier capable of high gain. the layout diagram of Figure 6.

FIGURE 6. VCA2618 Layout.

SBOS254B www.ti.com PBS (S-PQFP-G32) PLASTIC QUAD FLATPACK Gage Plane 0,13 NOM 0,25 0,40 0,70 Seating Plane 0,10 MIN 4087735/A 11/95 0,17 0,23 5,05 4,95 SQ 3,50 TYP 6,90 7,10 SQ 1,05 0,95 1,20 MAX 0,08 0,50 M0,08 0°–7 ° NOTES: A. All linear dimensions are in millimeters. B. This drawing is subject to change without notice. PACKAGE DRAWING

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