LTC1391_1 LINER
Document overview
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Technical content
Cascadable Serial Interface n Low RON: 45W n Single 2.7V to –5V Supply Operation n Low Charge Injection n Serial Digital Interface n Analog Inputs May Extend to Supply Rails n Low Leakage: –5nA Max n Guaranteed Break-Before-Make n TTL/CMOS Compatible for All Digital Inputs n Cascadable to Allow Additional Channels n Can Be Used as a Demultiplexer The LTC 1391 is a high performance CMOS 8-to-1 analog multiplexer. It features a serial digital interface that allows several LTC1391s to be daisy-chained together, increas- ing the number of MUX channels available using a single digital port. The LTC1391 features a typical R ON of 45 W , a typical switch leakage of 50pA and guaranteed break-before- make operation. Charge injection is –10pC maximum. All digital inputs are TTL and CMOS compatible when oper- ated from single or dual supplies. The inputs can with- stand 100mA fault current. The LTC1391 is available in 16-pin PDIP, SSOP and narrow SO packages. For applications requiring 2-way serial data transmission, see the LTC1390 data sheet. n Data Acquisition Systems n Communication Systems n Signal Multiplexing/Demultiplexing , LTC and LT are registered trademarks of Linear Technology Corporation. V D DOUT DIN CS CLK GND ANALOG INPUTS LTC1391 VCC CLK DOUT CS/SHDN VREF +IN –IN GND LTC1285 0.1µF OPTIONAL A/D INPUT FILTER 1µF DATA IN CLK CS DATA OUT SERIAL INTERFACE TO MUX AND ADC
1391 TA01
ANALOG INPUT VOLTAGE (V) –5 –4 –2 0 2 4 ON-RESISTANCE (W ) 300 250 200 150 100 –3 –1 1 3
1391 TA02
TA = 25°C V+ = 2.7V V– = 0V V+ = 5V V– = –5V On-Resistance vs Analog Input Voltage3V, 8-Channel 12-Bit ADC FEATURES DESCRIPTIO U APPLICATIO SU TYPICAL APPLICATIO U
LTC1391ISThe l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. V+ = 5V, V– = – 5V, GND = 0V, unless otherwise specified. Input Voltage Operating Temperature Range TJMAX = 125°C, qJA = 110°C/ W (GN) TJMAX = 125°C, qJA = 70°C/ W (N) TJMAX = 125°C, qJA = 100°C/ W (S) (Note 1) TOP VIEW N PACKAGE 16-LEAD PDIP GN PACKAGE 16-LEAD PLASTIC SSOP S PACKAGE 16-LEAD PLASTIC SO V D DOUT DIN CS CLK GND GN PART MARKING 1391 1391I ABSOLUTE AXI U RATI GSW WW U PACKAGE/ORDER I FOR ATIOUU W
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Switch VANALOG Analog Signal Range (Note 2) l –5 5 V RON On-Resistance V S = –3.5V, ID = 1mA T MIN = 0°C (LTC1391C) 75 W TMIN = –40 °C (LTC1391I) 25°C4 5 7 5 W TMAX = 70°C (LTC1391C) 120 W TMAX = 85°C (LTC1391I) DRON vs VS 20 % DRON vs Temperature 0.5 %/ °C IS(OFF) Off Input Leakage V S = 4V, VD = –4V, V S = –4V, V D = 4V – 0.05 – 5n A Channel Off l – 20 nA ID(OFF) Off Output Leakage V S = 4V, VD = –4V, V S = –4V, V D = 4V – 0.05 – 5n A Channel Off l – 20 nA ID(ON) On Channel Leakage V S = VD = –4V – 0.05 –5n A Channel On l – 20 nA Digital VINH High Level Input Voltage V + = 5.25V l 2.4 V VINL Low Level Input Voltage V + = 4.75V l 0.8 V IINL, IINH Input Current V IN = 5V, 0V l –5 mA VOH High Level Output Voltage V + = 4.75V, IO = – 10mA 4.74 V V+ = 4.75V, IO = –360 mA l 2.4 4.50 V VOL Low Level Output Voltage V + = 4.75V, IO = 1.6mA l 0.5 0.8 V Consult LTC Marketing for parts specified with wider operating temperature ranges.
The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. V+ = 5V, V– = – 5V, GND = 0V, unless otherwise specified. The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. V+ = 2.7V, V– = GND = 0V, unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Dynamic fCLK Clock Frequency (Note 2) 5 MHz tON Enable Turn-On Time V S = 2.5V, RL = 1k, CL = 35pF 260 400 ns tOFF Enable Turn-Off Time V S = 2.5V, RL = 1k, CL = 35pF 100 200 ns tOPEN Break-Before-Make Interval 35 155 ns OIRR Off Isolation V S = 2VP–P, RL = 1k, f = 100kHz 70 dB QINJ Charge Injection R S = 0, CL = 1000pF, VS = 1V (Note 2) –2 –10 pC CS(OFF) Input Off Capacitance 5p F CD(0FF) Output Off Capacitance 10 pF Supply I+ Positive Supply Current All Logic Inputs Tied Together, V IN = 0V or 5V l 15 40 mA I– Negative Supply Current All Logic Inputs Tied Together, V IN = 0V or 5V l –1 5 –4 0 mA SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Switch VANALOG Analog Signal Range (Note 2) l 0 2.7 V RON On-Resistance V S = 1.2V, IO = 1mA T MIN = 0°C (LTC1391C) 300 W TMIN = –40 °C (LTC1391I) 25°C 250 300 W TMAX = 70°C (LTC1391C) 350 W TMAX = 85°C (LTC1391I) DRON vs VS 20 % DRON vs Temperature 0.5 %/ °C Channel Off l – 20 nA Channel Off l – 20 nA ID(ON) On Channel Leakage V S = VD = 0.5V, 2.5V (Note 3) – 0.05 –5n A Channel On l – 20 nA Digital VINH High Level Input Voltage V + = 3.0V l 2.0 V VINL Low Level Input Voltage V + = 2.4V l 0.8 V IINL, IINH Input Current V IN = 2.7V, 0V l –5 mA VOH High Level Output Voltage V + = 2.7V, IO = –20 mA 2.68 V V+ = 2.7V, IO = – 400mA l 2.0 2.30 V VOL Low Level Output Voltage V + = 2.7V, IO = 20mA 0.01 V V+ = 2.7V, IO = 400mA l 0.20 0.8 V
ELECTRICAL CHARACTERISTICSThe l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. V+ = 2.7V, V– = GND = 0V, unless otherwise specified. Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: Guaranteed by Design. Note 3: Leakage current with a single 2.7V supply is guaranteed by correlation with the –5V leakage current specifications. Note 4: Timing specifications with a single 2.7V supply are guaranteed by correlation with the –5V timing specifications. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Dynamic fCLK Clock Frequency (Note 2) 5 MHz tON Enable Turn-On Time V S = 1.5V, RL = 1k, CL = 35pF (Note 4) 490 800 ns tOFF Enable Turn-Off Time V S = 1.5V, RL = 1k, CL = 35pF (Note 4) 190 400 ns tOPEN Break-Before-Make Interval (Note 4) 125 290 ns QIRR Off Isolation V S = 2VP–P, RL = 1k, f = 100kHz 70 dB QINJ Charge Injection R S = 0, CL = 1000pF, VS = 1V (Note 2) –1 –5p C CS(OFF) Input Off Capacitance 5p F CD(OFF) Output Off Capacitance 10 pF Supply I+ Positive Supply Current All Logic Inputs Tied Together, V IN = 0V or 2.7V l 0.2 2 mA TEMPERATURE (°C) –40 –20 ON-RESISTANCE (W ) 300 250 200 150 100
1391 G01
V+ = 2.7V V– = 0V VS = 1.2V V+ = 5V V– = –5V VS = 0V On-Resistance vs Temperature TEMPERATURE (°C) –40 OUTPUT VOLTAGE (V) 0.65 0.60 0.55 0.50 0.45 0.40 0.35 0.30 0.25 0.20 0.15 0.10
1391 G03
–20 02 0 40 80 V+ = 5V V– = –5V IO = 1.8mA V+ = 2.7V V– = 0V IO = 400mA OUTPUT CURRENT (mA) OUTPUT VOLTAGE (V)
1391 G02
1.2 1.1 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 TA = 25°C V+ = 2.7V V– = 0V V+ = 5V V– = –5V Driver Output Low Voltage vs Output Current Driver Output Low Voltage vs Temperature TYPICAL PERFOR A CE CHARACTERISTICS UW
8): Analog Multiplexer Inputs. GND (Pin 9): Digital Ground. Connect to system ground. CLK (Pin 10): System Clock (TTL/CMOS Compatible). The clock synchronizes the channel selection bits and the serial data transfer from DIN to DOUT. CS (Pin 11): Channel Select Input (TTL/CMOS Compat- ible). A logic high on this input enables the LTC1391 to read in the channel selection bits and allows digital data transfer from DIN to DOUT. A logic low on this input puts DOUT into three-state and enables the selected channel for analog signal transmission. DIN (Pin 12): Digital Input (TTL/CMOS Compatible). Input for the channel selection bits. DOUT (Pin 13): Digital Output (TTL/CMOS Compatible). Output from the internal shift register. V– (Pin 14): Negative Supply. For –5V dual supply appli- cations, |V– | should not exceed |V+|by more than 20% for proper channel selection. D (Pin 15): Analog Multiplexer Output. V+ (Pin 16): Positive Supply. TYPICAL PERFOR A CE CHARACTERISTICS UW OUTPUT VOLTAGE (V) 2.0 2.5 OUTPUT CURRENT (mA)
1391 G04
–0.5 –1.0 –1.5 –2.0 –2.5 –3.0 –3.5 –4.0 V+ = 5V V– = –5V TA =25°C V+ = 2.7V V– = 0V TEMPERATURE (°C) –40 OUTPUT VOLTAGE (V) 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5
1391 G05
–20 02 0 40 80 V+ = 5V V– = –5V IO = 1.6mA V+ = 2.7V V– = 0V IO = 400mA Driver Output High Voltage vs Output Current Driver Output High Voltage vs Temperature
channels and there will be no analog signal transmission. Table 1. Logic Table for Channel Selection Figure 2. Multiplexer Operation Figure 1. Simplified Block Diagram of the MUX Operation Figure 3. Simplified Block Diagram of the
1391 F03
V D DOUT DIN CS CLK GND LTC1391 A VCC CLK DOUT CS VREF +IN –IN GND LTC1286 V D DOUT DIN CS CLK GND ANALOG INPUTS LTC1391 E
1391 TA04
0.1µF BYPASS CAPACITORS FROM V+ TO GND FOR EACH LTC1391 V D DOUT DIN CS CLK GND LTC1391 B V D DOUT DIN CS CLK GND LTC1391 C V D DOUT DIN CS CLK GND LTC1391 D 0.1µF ANALOG INPUTS ANALOG INPUTS ANALOG INPUTS ANALOG INPUTS DATA OUT Daisy-Chaining Five LTC1391s
GN16 (SSOP) 1098 * DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE 12 3 4 5 6 7 8 0.229 – 0.244 (5.817 – 6.198) 0.150 – 0.157 (3.810 – 3.988) 16 15 14 13 0.189 – 0.196* (4.801 – 4.978) 12 11 10 9 0.016 – 0.050 (0.406 – 1.270) 0.015 – 0.004 0° – 8° TYP0.007 – 0.0098 (0.178 – 0.249) 0.053 – 0.068 (1.351 – 1.727) 0.008 – 0.012 (0.203 – 0.305) 0.004 – 0.0098 (0.102 – 0.249) 0.0250 (0.635) BSC 0.009 (0.229) REF 16-Lead Plastic SSOP (Narrow .150 Inch) (Reference LTC DWG # 05-08-1641)
0.255 – 0.015* (6.477 – 0.381) 0.770* (19.558) MAX 1 2 3 4 5 6 7 8 9101112131415 0.020 (0.508) MIN 0.125 (3.175) MIN 0.130 – 0.005 (3.302 – 0.127) 0.065 (1.651) TYP 0.045 – 0.065 (1.143 – 1.651) 0.018 – 0.003 (0.457 – 0.076) 0.100 (2.54) BSC 0.009 – 0.015 (0.229 – 0.381) 0.300 – 0.325 (7.620 – 8.255) 0.325 +0.035 –0.015 +0.889 –0.3818.255() *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm) N Package 16-Lead PDIP (Narrow .300 Inch) (Reference LTC DWG # 05-08-1510)
0.016 – 0.050 (0.406 – 1.270) 0.010 – 0.020 0° – 8° TYP 0.008 – 0.010 (0.203 – 0.254) 1 2 3 4 5 6 7 8 0.150 – 0.157** (3.810 – 3.988) 16 15 14 13 0.386 – 0.394* (9.804 – 10.008) 0.228 – 0.244 (5.791 – 6.197) 12 11 10 9 S16 1098 0.053 – 0.069 (1.346 – 1.752) 0.014 – 0.019 (0.355 – 0.483) TYP 0.004 – 0.010 (0.101 – 0.254) 0.050 (1.270) BSC DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE S Package 16-Lead Plastic Small Outline (Narrow .150 Inch) (Reference LTC DWG # 05-08-1610) 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 represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
PART NUMBER DESCRIPTION COMMENTS LTC1285 3V 12-Bit ADC Micropower, Auto Shutdown, SO-8 Package, SPI, QSPI + MICROWIRE TM Compatible LTC1286 5V 12-Bit ADC Micropower, Auto Shutdown, SO-8 Package, SPI, QSPI + MICROWIRE Compatible LTC1380/LTC1393 SMBus-Controlled Analog Multiplexer Low R ON and Low Charge Injection LTC1390 Serial-Controlled 8-to-1 Analog Multiplexer Low R ON, Bidirectional Serial Interface, Low Power, 16-Pin SO LTC1401 3V, 12-Bit, 200ksps Serial ADC 15mW, Internal Reference, SO-8 Package LTC1402 12-Bit, 2.2Msps Serial ADC 90mW with Nap and Sleep Modes, 5V or –5V, Internal Reference LTC1404 12-Bit, 600ksps Serial ADC 5V or –5V, Internal Reference and Shutdown LTC1417 14-Bit, 400ksps Serial ADC 20mW, Single 5V or –5V Supply LTC1451 5V 12-Bit Voltage Output DAC Complete V OUT DAC, SO-8 Package, Daisy-Chainable, Low Power LTC1452 5V and 3V 12-Bit Voltage Output DAC Multiplying V OUT DAC, SO-8 Package, Rail-to-Rail Output, Low Power LTC1453 3V 12-Bit Voltage Output DAC Complete V OUT DAC, SO-8 Package, Daisy-Chainable, Low Power LT1460-2.5 Micropower, Precision Bandgap Reference 130 mA Supply Current, 10ppm/°C, Available in SOT-23 LT1461-2.5 Micropower, Low Dropout Reference 50 mA Supply Current, 300mV Dropout, 3ppm/°C Drift LTC1655/LTC1655L 16-Bit, Voltage Output DAC, 5V/3V SO-8 Package, Micropower, Serial I/O LTC1658 14-Bit, Voltage Output DAC Micropower, Multiplying V OUT, Swings from GND to VREF MICROWIRE is a trademark of National Semiconductor. RELATED PARTS Interfacing LTC1391 with LTC1257 for Demultiplex Operation V D DOUT DIN CS CLK GND LTC1391 VCC VOUT VREF GND CLK DIN LOAD D OUT LTC1257 5V £ V+ £ 12V 0.1µF 0.1µF OPTIONAL D/A OUTPUT FILTER 47k DATA
1391 TA03CS
AT V+ = 5V LT/TP 0701 1.5K REV A • PRINTED IN USA ª LINEAR TECHNOLOGY CORPORATION 1 995 Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 l FAX: (408) 434-0507 l www.linear.com TYPICAL APPLICATIO U