Application Note 62 October 1994 Data Acquisition Circuit Collection Kevin R. Hoskins INTRODUCTION This application note features 8-, 10-, and 12-bit data acquisition components in various circuit configurations. The circuits include battery monitoring, temperature sensing, isolated serial interfaces, and microprocessor and microcontroller serial and parallel interfaces. Also included are voltage reference circuits (Application Note 42 contains more voltage reference circuits). Additional circuit information is located in the information references listed in the Circuit Index. Each information reference refers to either an application note (example: AN42 = Application Note 42), a data sheet (example: LTC®1292 DS = LTC1292 Data Sheet), or a design note (example: DN66 = Design Note 66). and LTC are registered trademarks and LT is a trademark of Linear Technology Corporation. CIRCUIT INDEX FIGURE TITLE FIGURE NO. General Analog-to-Digital Application Circuits Two-Quadrant 150kHz Bandwidth Analog Multiplier ....................................................... Figure 1 ....... Infinite Hold-Time Sample-and-Hold (tACQ = 240ns) ....................................................... Figure 2 ....... Four-Quadrant 250kHz Bandwidth Analog Multiplier ....................................................... Figure 3 ....... Demodulating a Signal Using Undersampling ................................................................. Figure 4 ....... Complete 100ps Resolution ∆Time Circuit with “Bow” Correction .................................. Figure 5 ....... Single 5V 12-Bit Temperature Control System with Shutdown ........................................ Figure 6 ....... Weight Scale .................................................................................................................... Figure 7 ....... Auto-Ranging 8-Channel 12-Bit Data Acquisition System with Shutdown ....................... Figure 8 ....... PAGE AN62-3 AN62-3 AN62-4 AN62-4 AN62-5 AN62-6 AN62-6 AN62-7 INFORMATION REFERENCE/SOURCE .................. LTC1099 DS .................. LTC1099 DS .................. LTC1257 DS .................. LTC1282 DS .................. LTC1257 DS ......... LTC1091/2/3/4 DS .................. LTC1257 DS Analog-to-Digital Battery Monitoring Application Circuits Micropower Battery Voltage Monitor .............................................................................. Figure 9 ....... AN62-8 ............... LTC1096/8 DS 0A to 2A Battery Current Monitor Draws Only 70µA ........................................................ Figure 10 ..... AN62-8 ............... LTC1096/8 DS LTC1297 Data Acquisition System Micropower Battery Current Monitor ........................ Figure 11 ..... AN62-9 Temperature Sensing and Conversion Current Output Silicon Sensor Thermometer Driving 10-Bit Analog-to-Digital Converter Covers – 55°C to 125°C with 0.2°C Resolution ........................................ Thermistor-Based Temperature Measurement System Covers 20°C to 40°C and 0°C to 100°C with 0.25°C Accuracy .................................................................. Digitally Linearized Platinum RTD Signal Conditioner ..................................................... Furnace Exhaust Gas Temperature Monitor Covers 0°C to 500°C and Has Low Supply Detection ................................................................................ Isolated Interfaces Floating Analog-to-Digital Conversion System Powered by Capacitor Charge Pump ...... Micropower Serial 10-Bit Data Acquisition System with 500V Opto-Isolated Communication ....................................................................................................... Opto-Isolated Temperature Monitor ................................................................................ Battery-Powered Digital Thermometer Transmits Over RF-Link ...................................... LTC1092 10-Bit Analog-to-Digital Converter Receives Power and Transmits Data Over Two Transformer-Isolated Lines ............................................. Figure 12 ..... AN62-9 ......... LTC1091/2/3/4 DS Figure 13 ..... AN62-10 ........ LTC1091/2/3/4 DS Figure 14 ..... AN62-10 ........ LTC1091/2/3/4 DS Figure 15 ..... AN62-11 ........ LTC1091/2/3/4/DS Figure 16 ..... AN62-11 .............. LTC1096/8 DS Figure 17 ..... AN62-12 ........ LTC1091/2/3/4 DS Figure 18 ..... AN62-13 ................. LTC1292 DS Figure 19 ..... AN62-13 Figure 20 ..... AN62-14 ............................ DN19 AN62-1 Application Note 62 FIGURE TITLE FIGURE NO. Miscellaneous Circuits Two LTC1390s Cascadable Serially Programmed 8-Channel Multiplexers Provide the Single Channel LTC1096 with 16 Analog Inputs ............................ Small 12-Bit Differential-Input LTC1292 Data Acquisition System Occupies Only 0.35IN2 Including Reference and Power Supply Bypass Components ...... 12-Bit LTC1296 Data Acquisition System Strain Gauge with Bridge-DriverPower Shutdown ............................................................................................... LTC1282 3V Analog-to-Digital Converter with Full-Scale Adjust ............................... Ultra-Low Full-Scale-Drift LTC1282 3V Analog-to-Digital Converter ......................... Ultra-Low Full-Scale-Drift LTC1273 3V Analog-to-Digital Converter ......................... “Tiny” LTC1286 12-Bit Differential-Input Data Acquisition System (In SO Package) and “Tiny” LT1019-2.5 Reference Occupies Only 0.47IN2 Including Reference and Power Supply Bypass Components ............................................................ Hardware Microcontroller Interfaces LTC1296 to Microcontroller Hardware Serial Interface .............................................. LTC1090 to Intel 8051 Microcontroller Hardware Serial Interface ............................ LTC1090 to Motorola MC68HC05C4 Microcontroller Hardware Serial Interface....... LTC1090 to Hitachi HD63705 Microcontroller Hardware Serial Interace .................. LTC1091 to Intel 8051 Microcontroller Hardware Serial Interface ............................ LTC1091 to Motorola MC68HC05C4 Microcontroller Hardware Serial Interface....... LTC1095 to Intel 8051 Microcontroller Hardware Serial Interace ............................. LTC1095 to Motorola MC68HC05C4 Microcontroller Hardware Serial Interace ........ Multiple LTC1095s Sharing One Three-Wire Serial Interface .................................... Multiple LTC1290s Sharing One Three-Wire Serial Interface .................................... Multiple LTC1094s Sharing One Three-Wire Serial Interface .................................... Interfacing the LTC1196 to the Altera EPM5064 PLD ................................................ SNEAK-A-BIT Circuit for the LTC1090: 11-Bit Resolution from a 10-Bit ADC ........... PAGE INFORMATION REFERENCE/SOURCE Figure 21 ..... AN62-15 Figure 22 ..... AN62-15 .......................... LTC1292 DS Figure 23 Figure 24 Figure 25 Figure 26 ..... ..... ..... ..... AN62-16 ................... LTC1293/4/6 DS AN62-16 .......................... LTC1282 DS AN62-16 .......................... LTC1282 DS AN62-16 Figure 27 ..... AN62-17 Figure 28 Figure 29 Figure 30 Figure 31 Figure 32 Figure 33 Figure 34 Figure 35 Figure 36 Figure 37 Figure 38 Figure 39 Figure 40 ..... ..... ..... ..... ..... ..... ..... ..... ..... ..... ..... ..... ..... AN62-17 ................... LTC1293/4/6 DS AN62-17 .......................... LTC1090 DS AN62-17 .......................... LTC1090 DS AN62-17 .......................... LTC1090 DS AN62-18 ................ LTC1091/2/3/4 DS AN62-18 ................ LTC1091/2/3/4 DS AN62-18 .......................... LTC1095 DS AN62-18 .......................... LTC1095 DS AN62-18 .......................... LTC1095 DS AN62-19 ........................... LTC1290 DS AN62-19 ................ LTC1091/2/3/4 DS AN62-19 ....................... LTC1196/8 DS AN62-20 .......................... LTC1090 DS PC Serial Interface Circuits LTC1094 Analog-to-Digital Converter RS232 Serial Interface Using the LT1180A Dual Driver/Receiver ........................................................................... Figure 41 ..... AN62-20 .................................... DN 29 LTC1290 to IBM PC Serial Port ................................................................................. Figure 42 ..... AN62-21 .................................... DN 35 Parallel Interface Circuits LTC1272/LTC1273/LTC1275/LTC1276 to 8085A/Z80 Microprocessor Hardware Parallel Interface ................................................................................ LTC1272/LTC1273/LTC1275/LTC1276 to MC68000 Microprocessor Hardware Parallel Interface ................................................................................ LTC1282 to TMS320C25 DSP Processor Parallel Interface ...................................... LTC1272/LTC1273/LTC1275/LTC1276 to TMS32010 DSP Processor Parallel Interface ................................................................................................ LTC1278 to TMS320C25 DSP Processor Parallel Interface ...................................... Reference Circuits LT1034-2.5 2.5V Voltage Reference .......................................................................... Battery-Powered LT1004-2.5 2.5V Voltage Reference ............................................... LT1431Z 2.5V Voltage Reference (3-Pin Package) .................................................... LT1431 2.5V Voltage Reference (8-Pin Package) ...................................................... LT1431Z 5V Voltage Reference (8-Pin Package) ....................................................... LT1027 12-Bit Accurate 5V Voltage Reference Supplying Input Voltages to the LTC1290’s VREF and VCC Pins .................................................................. Figure 43 ..... AN62-21 .... LTC1272/LTC1273/5/6 DS Figure 44 ..... AN62-21 .... LTC1272/LTC1273/5/6 DS Figure 45 ..... AN62-22 .......................... LTC1282 DS Figure 46 ..... AN62-22 ..... LTC1272/LTC1273/5/6 DS Figure 47 ..... AN62-22 Figure 48 Figure 49 Figure 50 Figure 51 Figure 52 ..... ..... ..... ..... ..... AN62-22 ............................. LT1034 DS AN62-22 ............................ LT1004 DS AN62-23 ............................ LT1431 DS AN62-23 ............................ LT1431 DS AN62-23 ............................ LT1431 DS Figure 53 ..... AN62-23 ............................ LT1027 DS Adjustable References LT1021-5 Adjustable 5V Voltage Reference .............................................................. Figure 54 ..... AN62-23 ............................ LT1021 DS LT1009 2.5V Voltage Reference with ±5% Trim Range ............................................ Figure 55 ..... AN62-23 ............................ LT1009 DS AN62-2 Application Note 62 INFORMATION REFERENCE/SOURCE FIGURE TITLE FIGURE NO. PAGE Appendices Analog-to-Digital/Digital-to-Analog Converter Selection Guides .................................. Appendix A ...... AN62-24 Voltage Reference Selection Guide .............................................................................. Appendix B ...... AN62-28 GENERAL ANALOG-TO-DIGITAL APPLICATION CIRCUITS (VIN) 0V TO 5V ANALOG INPUT 5V (VIN2) +10V TO – 10V ANALOG INPUT 4 DB0 TO DB3 CS AND RD LOW 8 12V DAC 1208 NC 1 0.1µF 3MHZ OSC 2 3 OUT 1 CLK 2 3 4 5V 0.1µF 14 4 13 5 12 74LS90 ÷10 = 300kHz 11 N/C 6 7 5V 5 10 8 6 9 9 7 8 NC 10 20 LTC1099 DB0 DB2 DB7 DB3 DB6 WR/RDY DB5 MODE DB4 RD CS INT GND REF – LT1019-5 6 4 3 4 16 5 15 6 14 7 13 8 4.7µF + 9 11 10 0.1µF 11 CS WR1 GND DI5 DI4 DI3 DI2 DI1 DI0 VREF RFB 7 2 3 2 12 8 = DIGITAL GROUND 1 17 12 REF + 1 = ANALOG GROUND 0.1µF 18 DB1 15VIN 4 DB4 TO DB7 5V 19 5 24 VCC BYTE1/ 23 BYTE2 22 WR2 21 XFER 20 DI6 19 DI7 18 DI8 17 DI9 16 DI10 15 DI11 14 IOUT2 13 IOUT1 5VREF OUT 10µF 50k OFFSET NULL 15V 1 5 15V + LT1122 10pF OUTPUT – –15V 25k = BUS AN62 F01 AGND Figure 1. Two-Quadrant 150kHz Bandwidth Analog Multiplier 5.000V 15V 10k 12 7 20 14 DB7 REF + B1 DB6 VIN SAMPLE HOLD 1 DB5 LTC1099 6 DB4 DB3 DB2 8 DB1 13 DB0 10 11 17 1 16 2 15 3 14 4 5 5 4 6 3 7 2 8 10k 20 V+ 2.5k B2 B4 18 IO B3 2 7 LT1122 AM6012 6 VOUT 3 B5 4 B6 IO B7 B8 REF – 15 19 V– 17 –15V AN62 F02 Figure 2. Infinite Hold Time Sample-and-Hold (tACQ = 240ns) AN62-3 Application Note 62 –5V ≤ VIN1 ≤ 5V –10V ≤ VIN2 ≤ 5V 15V 1 10µF 0.1µF + SAMPLE CLOCK (fSAMPLE ≤ 500kHz) 2 19 22 18 20 21 24 VA+ = 5V VA– = –5V 0.1µF 0.1µF 23 3 17 VD+ = 5V 0.1µF 12 VA+ = POSITIVE ANALOG SUPPLY VOLTAGE VA– = NEGATIVE ANALOG SUPPLY VOLTAGE VD+ = DIGITAL SUPPLY VOLTAGE D11 AIN D10 VREF D9 CONVST D8 BUSY SHDN D7 RD D6 LTC1278 D5 CS AVDD D4 D3 VSS AGND DVDD DGND D2 D1 D0 4 15 5 16 6 17 7 18 8 19 9 20 10 4 11 5 13 6 14 7 15 8 16 9 D11 VREF D10 IOUT1 D9 IOUT2 D8 RFB D7 GND D6 DAC1208 XFER D5 WR2 D4 WR1 D3 CS D2 BYTE1/BYTE2 D1 VCC D0 GND 10 0.1µF 13 – 14 VOUT LT1122 + 11 12 0.1µF –15V 21 22 21 AN62 F03 CS 23 24 3 15V 0.1µF = ANALOG GROUND = DIGITAL GROUND Figure 3. Four-Quadrant 250kHz Bandwidth Analog Multiplier 5V 455kHz AMPLITUDE MODULATED INPUT RD AIN RD 227.5kHz SAMPLE RATE LTC1275 D11 D0 –5V 455kHz AM SIGNAL MODULATED BY – 6dB, 5kHz SINEWAVE 1V/DIV DEMODULATED 5kHz OUTPUT SINEWAVE 1V/DIV DATA OUTPUT AN62 F04a* 5µs/DIV AN62 F04b Figure 4. Demodulating a Signal Using Undersampling AN62-4 Application Note 62 3.3V + 65Ω 2N2369 65Ω 2N2369 200k 10µF 1N457 2N5771 10µF + REFOUT 20k 430Ω LM134 AIN 250pF POLYSTYRENE 45.3Ω VDD 12-BIT DATA OUTPUT LTC1282 CS VSS GND RD BUSY 74HC03 1N457 74HC74 45.3Ω 3.3V D START↑ Q CLK Q CLR 1k 1N4148 DATA LATCH SIGNAL 10k 3.3V D Q CLK Q 5V STOP↑ 1N4148 1k CLR 100k 100pF 0.001µF 1k 3.3V 10k 10pF AN62 F05a 1.0 ∆TIME LINEARITY ERROR (ns) 0.8 0.6 START 5V/DIV 0.4 STOP 5V/DIV RAMP 500mV/DIV 0.2 0 –0.2 –0.4 –0.6 –0.8 –1.0 0 100 300 200 ∆TIME (ns) 400 500 AN62 F05b 50ns/DIV THE PHOTO SHOWS THE START, STOP AND RAMP WAVEFORMS FOR A HALF SCALE, 200ns INPUT. THE RAMP REACHES 2.5V IN 400ns FOR A FULL-SCALE ADC INPUT. THE 4096 CODES SPREAD OVER 400ns EQUATE TO 100ps PER LSB. AN62 F05c Figure 5. Complete 100ps Resolution ∆Time Circuit with “Bow” Correction AN62-5 Application Note 62 5V 100k + 10k 10µF 2N3906 VCC –IN DOUT 0.1µF – + +IN VIN J COMM VREF 47k + 1µF DATA CLK µP LTC1297 ADC LT1025A GND CS/ POWER DOWN CLK CS DAC LOAD GND 1µF 1µF 100k LTC1050 – 74k VREF VCC DIN 1k CONTROL OUTPUT CLK LTC1257 DAC LOAD VOUT DOUT GND AN62 F06 Figure 6. Single 5V 12-Bit Temperature Control System with Shutdown 5V S1 MOTOR DRIVER PB0 PA7 MC68HC05 PC2 MISO SCK RED, YELLOW 5V + 4.7µF NCI 3220 SCALE PLATFORM 1k 5.23k CS CLK 10k 2k GREEN – WHITE 3 2k + 1k 9.09k 2.15M + LT1013 2 1 LTC1092 8 DOUT 7 – 2µF VIOLET 6.2Ω 5 – 6 LT1013 4 2.15M FS ADJ + 4.75k + 4.7µF BLACK, BLUE AN62 F07 Figure 7. Weight Scale AN62-6 Application Note 62 + 5V V CH0 CC CS LTC1296 DOUT 8 ANALOG INPUT CHANNELS CH7 CLK COM DIN REF 50k 22µF + REF – µP SSO 50k 5V 74HC04 2N3906 0.1µF VREF DIN VCC 100Ω VOUT DAC1 LTC1257 0.1µF CLK LOAD DOUT GND VREF DIN VCC 100Ω VOUT CLK DAC2 LTC1257 LOAD 0.1µF DOUT GND NOTE: THE µP SETS THE LTC1296’s FULL-SCALE AND ZERO-SCALE MAGNITUDES WITH THE CODE APPLIED TO DAC1 AND DAC2, RESPECTIVELY. AN62 F08 Figure 8. Auto-Ranging 8-Channel 12-Bit Data Acquisition System with Shutdown AN62-7 Application Note 62 ANALOG-TO-DIGITAL BATTERY MONITORING APPLICATION CIRCUITS 3V BATTERY MONITOR INPUT 8V TO 16V 266k 0.1µF 75k VCC CS +IN 0.1µF LTC1096 100k CLOCK –IN VREF 1µF LT1004-1.2 DOUT GND 3Ω AN62 F09 Figure 9. Micropower Battery Voltage Monitor 0.1µF 0.1µF 73.2k 3V TO 6V 24.9k L O A D 0.2Ω FOR 2A FULL SCALE 0.2Ω FOR 0.2A FULL SCALE 470k 750k + 1/2 LT1178 – CS VCC CLK +IN LTC1096 –IN DOUT GND VREF TO µP 750k + 1/2 LT1178 LO BATTERY – LT1004-1.2 470k AN62 F10 Figure 10. 0A to 2A Battery Current Monitor Draws Only 70µA AN62-8 Application Note 62 IN 5V OUT 0.33µF LT1121 GND SHDN 1N4148 510k 0.1µF 6V TO 12V L O A D 100k 750k 3k 0.005Ω 2A FULL SCALE VCC CS – 1/2 LTC1047 10Ω +IN + 1µF LTC1297 + TO µP 22µF TANT CLK –IN DOUT GND VREF LO BATTERY 470k 0.1µF – 1/2 LTC1047 LT1004-2.5 + 20M AN62 F11 Figure 11. LTC1297 Data Acquisition System Micropower Battery Current Monitor TEMPERATURE SENSING AND CONVERSION 5V 9V 4.7µF + 10µF LT1019-2.5 + LM134 OR OTHER 1µA/°K SENSOR 3Ω 226Ω CS VCC +IN SCLK TO MCU LTC1092 0.1µF 11.5k –IN DOUT GND VREF AN62 F12 Figure 12. Current Output Silicon Sensor Thermometer Driving 10-Bit Analog-to-Digital Converter Covers –55°C to 125°C with 0.2°C Resolution AN62-9 Application Note 62 5V 2N3904 + 10k ±10% YSI 44201 0°C TO 100°C 4.7µV 15k ±10% CHO VCC CH1 ACLK CH2 SCLK CH3 DIN LTC1090 CH4 DOUT YSI 44201 5k AT 25°C 20°C TO 40°C * 2954Ω CH5 CS CH6 REF + CH7 REF – COM V– DGND TO MCU + LT1006 – AGND 5k 1.491k 4.562k *YSI 44007 OR 44034 AN62 F13 Figure 13. Thermistor-Based Temperature Measurement System Covers 20°C to 40°C and 0°C to 100°C with 0.25°C Accuracy 5VOUT 15V LT1027 + 10µF 12k* 500k 400°C TRIM 12.5k* 15V 15V + A1 LT1101 A =10 – 1k* RPLAT + 1k A2 LT1006 – 30.1k** 1µF 3.92M** * TRW-IRC MAR-6 RESISTOR – 0.1% ** 1% FILM RESISTOR † FOR MICROCONTROLLER CODE, SEE AN43, PAGE13 RPLAT = 1k AT 0°C , ROSEMOUNT #118MF CH0 CH1 CH2 CH3 CH4 LTC1294 CH5 CH6 CH7 COM DGND DVCC AVCC CLK CS DOUT DIN REF+ REF – AGND V– 22µF TANTALUM TO/FROM 68HC11 PROCESSOR† 500k 0°C TRIM Figure 14. Digitally Linearized Platinum RTD Signal Conditioner AN62-10 + AN62 F14 Application Note 62 9V 2 2 8 J TYPE J 10µF LT1025A 20k GND COMMON 4 5 + + GND 4 0.1µF VIN – 6 LT1019A-5 3 1µF 7 + 2 CS VCC CH0 CLK 8 – LTC1091A 4 1 0.1µF 0.1µF TO MCU 47Ω 6 LTC1052 1N4148 1µF 10k CH1 DOUT GND DIN AN62 F15 1k 0.1% 0.33µF 3.4k 1% 178k 0.1% Figure 15. Furnace Exhaust Gas Temperature Monitor Covers 0°C to 500°C and Has Low Supply Detection ISOLATED INTERFACES CHARGE PUMP 0.001µF 2kV 1N5817 1N5817 2N3904 47µF 0.1µF 75k VCC 5MHz VREF 0.022µF 100k LT1004-2.5 20k CS 300Ω LTC1096 +IN 1N5817 4N28 –IN CLK 100k CLK ANALOG INPUT DOUT GND 1k 10k DATA 500k + FLOATING SYSTEM AN62 F16 VFLOAT – Figure 16. Floating Analog-to-Digital Conversion System Powered by Capacitor Charge Pump AN62-11 Application Note 62 4 1 2 3 4 NC NC VIN LT1021-5 NC NC VOUT GND TRIM 9V 8 10k 51k 6 5 6 + 2 3 8 ANALOG INPUTS 0V TO 5V RANGE 4 5 6 7 8 9 10 CHO DVCC CH1 AVCC CH2 CLK CH3 CS CH4 LTC1094 DOUT 18 SCK 150Ω 1 4 17 5 16 51k 6 5V 4N28 10k 2 C0 150Ω 1 TO 68HC05** 15 DIN REF + CH7 13 REF – DGND 5.1k ×3 19 CH6 AGND 10k 20 CH5 COM 5V 2 51k 6 1 150Ω 4N28 5 10µF* C1 2N3906 1 4 1Ω 10k 2 5 2M3906 7 5V 4N28 10k 14 12 4 TO ADDITIONAL LTC1094s 10k 2 5 11 V– 5V 4N28 MOSI 51k 6 1 150Ω 300Ω 1 6 51k 5.1k 5 2 * SOLID TANTALUM ** MC68HC05 CODE AVAILABLE FROM LINEAR TECHNOLOGY 10k 2N3904 4N28 4 MISO AN62 F17 ISOLATION BARRIER 5V Figure 17. Micropower Serial 10-Bit Data Acquisition System with 500V Opto-Isolated Communication AN62-12 Application Note 62 ISOLATED 5V + 2k 0.1% 22µF 3.4k 0.1% 1N4148 178k 0.1% LT1019-2.5 1N4148 3 10k 4 1 4N28 5V 0.33 µ F + 1N4148 2 + LTC1292 2 7 – 2 LTC1050 VIN J 3 8 + – 1 47Ω 6 2 3 + 4 4 LT1025A GND 4 + R 5 CS VCC +IN CLK –IN DOUT GND VREF + 1 µF 500k 7 6 5k 5 4.7 µ F 1µF TYPE J CLK IN 6 0.1µF 100k 8 1k + 5V 74C14 1k 5k 1 3Ω 3 4N28 0°C TO 500°C TEMPERATURE RANGE DATA OUT 4 2 6 500k AN62 F18 Figure 18. Opto-Isolated Temperature Monitor 3V V+ R 678Ω 10M 74HC132 LM134 0.22µF 1M 100k V– 2M 300pF 3V 510Ω MBR0540T1 3V 30k VCC 13.5k +IN LTC1096 –IN VREF LT1004-1.2 CARRY VDD CS CLK DOUT GND CLK 74HC161 100k VSS 45.3k 3V 5.1k 15.8k 30nH* REF OUT 300MHz MRF501 *TWO TURNS OF BUS WIRE WRAPPED AROUND A PENCIL AN62 F19 5pF 8pF Figure 19. Battery-Powered Digital Thermometer Transmits Over RF-Link AN62-13 Application Note 62 74HC132 1N4148 10k 5V 2000pF 5.1k 1N4148 1Ω LT1021-5 1µF 1 VCC CS 2 +IN 3 4 LTC1092 CLK –IN DOUT GND VREF 1µF 10k 8 7 6 5 750pF 10k 74HC00 5V 74HC04 74HC132 74HC04 1µF 1 1N4148 RIPPLE 16 CARRY OUT 15 VCC CLK 14 A QA 13 B 74HC161 QB 12 C QC 11 D QD 10 ENABLE P ENABLE T 9 GND LOAD CLR 2 3 4 5 6 7 8 74HC04 5k 39pF 510pF 100pF 75k 74HC00 470Ω 1N4148 74HC04 10k 100pF 74HC00 VCC VCC 100pF 10k LOAD DATA 1N4148 PE-2229X* VCC HP2810 1k 1k 3 4 5 6 8 7 100pF 10k VCC VCC CS 1k + 2 1N4148 2N2905 15V 1 1k 51k 10k 1k 12 11 10 9 16 15 14 13 VCC REXT/ CEXT1 Q1 Q2 CLR2 B2 A2 CEXT1 74HC221 REXT/ A1 B1 CLR1 Q1 Q2 CEXT2 CEXT1 GND D CLR SET Q 74HC74 CLK Q 74HC14 51k HP2810 1µF 1k 5k 10µF 8 CLK 9 CLR 1 IN A 2 IN B 2N3904 74HC14 74HC164 3 4 5 6 10 11 12 13 * PULSE ENGINEERING, INC. P.O. BOX 12235 7250 CONVOY COURT SAN DIEGO, CA 92112 9 CLR 1 IN A 74HC164 2 IN B 3 4 5 LSB 0 1 2 3 4 5 6 7 8 CLK VCC = 5V CS PULSE WIDTH = 2µs TO 6µs LOAD DATA PULSE WIDTH = 1µs fCS = 10kHz 8 9 MSB TIMING DIAGRAM SHOWING PULSE-WIDTH CODING TECHNIQUE CS CLOCK DOUT START BIT 9 8 7 6 5 4 3 2 ENCODED OUTPUT 0 AN62 F20b Figure 20. LTC1092 10-Bit Analog-to-Digital Converter Receives Power and Transmits Data Over Two Transformer-Isolated Lines AN62-14 1 AN62 F20 Application Note 62 MISCELLANEOUS CIRCUITS 5V CH0 CH1 CH2 CH3 CH4 CH5 CH6 CH7 CH8 CH9 CH10 CH11 CH12 CH13 CH14 CH15 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 V+ S0 S1 LTC1390 D S2 V– S3 DATA2 S4 DATA1 S5 CS S6 CLK S7 GND S0 V+ S1 LTC1390 D S2 V– S3 DATA2 S4 DATA1 S5 CS S6 CLK S7 GND 16 –5V 0.1µF 5V 15 14 0.1µF 1 0.1µF 2 R C 4 11 10 8 +IN GND VREF 5 OPTIONAL ADC INPUT FILTER 9 16 VCC 7 CLK LTC1096 3 6 –IN DOUT 13 12 CS 0.1µF 15 14 0.1µF 13 12 11 10 9 CLK CS DATA AN62 F21 Figure 21. Two LTC1390 Cascadable Serially Programmed 8-Channel Multiplexers Provide the Single Channel LTC1096 with 16 Analog Inputs 22µF TANTALUM + VCC CS DIFFERENTIAL INPUTS COMMON-MODE RANGE 0V TO 5V + +IN 5V CLK MC68HC11 SCK 1N4148 LTC1292 – DO –IN DOUT GND VREF MISO LT1027 + 4.7µF TANTALUM 8V TO 40V 1µF AN62 F22 Figure 22. Small 12-Bit Differential-Input LTC1292 Data Acquisition System Occupies Only 0.35IN2 Including Reference and Power Supply Bypass Components AN62-15 Application Note 62 RB 5.1k 2N3906 R2 1.2M + R1 10k CH0 VCC 1/4 LT1014 CH1 SSO – CH2 CLK CH3 CS R2 1.2M CH4 DOUT C2 1µF CH6 REF+ CH7 REF – COM AGND 350Ω STRAIN GAUGE BRIDGE CH5 74HC04 + 5V 47µF MPU LTC1296 1N4148 DIN AN62 F23 THREE ADDITIONAL STRAIN GAUGE INPUTS CAN BE ACCOMMODATED USING THE OTHER AMPLIFIERS IN THE LT1014 V– DGND Figure 23. 12-Bit LTC1296 Data Acquisition System Strain Gauge with Bridge-Driver-Power Shutdown INPUT RANGE ±1.033VREF(OUT) AIN + VREF(OUT) ≥ 1.25V LT1006 – VDD 3V INPUT RANGE ±2.60V 5V VOUT VREF AGND VSS 3V VREF LT1019A-2.5 3Ω 10µF VDD AIN VIN LTC1282 3Ω GND –3V LTC1282 + 10µF AGND VSS –3V AN62 F24 AN62 F25 Figure 25. Ultra-Low Full-Scale Drift LTC1282 3V Analog-to-Digital Converter Figure 24. LTC1282 3V Analog-to-Digital Converter with Full-Scale Adjust INPUT RANGE ±2.583V 5V VDD AIN 5V VIN VOUT LT1019A-2.5 GND VREF 3Ω LTC1273 + 10µF AGND VSS –5V AN62 F26 Figure 26. Ultra-Low Full-Scale Drift LTC1273 3V Analog-to-Digital Converter AN62-16 Application Note 62 0.1µF 5V 1 DIFFERENTIAL INPUTS COMMON-MODE RANGE 0V TO 5V 2 + 3 – 4 VREF VCC +IN CLK LTC1286 –IN DOUT GND CS/SHDN 8 P1.4 0.1µF 7 P1.3 6 MPU (e.g. 8051) P1.2 SERIAL DATA LINK 5 AN62 F27 6 1.5M 100k 5 3 OUT IN TRIM HEATER LT1019-2.5 TEMP NC* NC* GND 2 7 NC 0.1µF 1 *INTERNALLY CONNECTED; DO NOT CONNECT EXTERNALLY 4 Figure 27. “Tiny” LTC1286 12-Bit Differential-Input Data Acquisition System (In SO Package) and “Tiny” LT1019-2.5 Reference Occupies Only 0.47IN2 Including Reference and Power Supply Bypass Components HARDWARE MICROCONTROLLER INTERFACES DOUT P1.1 DIN P1.2 LTC1090 SCLK P1.3 CS P1.4 ACLK ALE CS 8 ANALOG INPUTS DIN 8 ANALOG INPUTS µP LTC1296 CLK DOUT AN62 F29 AN62 F28 Figure 28. LTC1296 to Microcontroller Hardware Serial Interface CS 8 ANALOG INPUTS SCLK Figure 29. LTC1090* to Intel 8051 Microcontroller Hardware Serial Interface C0 SCK MC68HC05C4 LTC1090 DIN MOSI DOUT MISO 8051 AN62 F30 Figure 30. LTC1090* to Motorola MC68HC05C4 Microcontroller Hardware Serial Interface 8 ANALOG INPUTS CS C0 SCLK CK DIN TX DOUT RX HD63705 LTC1090 AN62 F31 Figure 31. LTC1090* to Hitachi HD63705 Microcontroller Hardware Serial Interface *Increase resolution from 10 bits to 12 bits with the pin compatible LTC1290. AN62-17 Application Note 62 CH0 CS P1.4 CLK P1.3 CS CH0 LTC1091 CH1 8051 DOUT C0 SCLK SCK MC68HC05C4 LTC1091 CH1 P1.2 DIN MOSI DOUT MISO MUX ADDRESS DIN A/D RESULT AN62 F32 AN62 F33 Figure 32. LTC1091* to Intel 8051 Microcontroller Hardware Serial Interface 6 ANALOG INPUTS CS P1.4 CLK P1.3 LTC1095 Figure 33. LTC1091* to Motorola MC68HC05C4 Microcontroller Hardware Serial Interface CS 6 ANALOG INPUTS 8051 DOUT P1.2 DIN A/D RESULT 1 SCK DIN MOSI DOUT MISO MC68HC05C4 AN62 F35 AN62 F34 Figure 34. LTC1095 to Intel 8051 Microcontroller Hardware Serial Interface 2 CLK LTC1095 MUX ADDRESS Figure 35. LTC1095 to Motorola MC68HC05C4 Microcontroller Hardware Serial Interface 0 OUTPUT PORT SERIAL DATA MPU C0 3-WIRE SERIAL INTERFACE TO OTHER PERIPHERALS OR LTC1095s 3 3 3 LTC1095 CS 3 LTC1095 CS LTC1095 CS AN62 F36 6 CHANNELS 6 CHANNELS 6 CHANNELS Figure 36. Multiple LTC1095s Sharing One Three-Wire Serial Interface *Increase resolution from 10 bits to 12 bits with the pin compatible LTC1291. AN62-18 Application Note 62 2 1 3-WIRE SERIAL INTERFACE TO OTHER PERIPHERALS OR LTC1290s 0 OUTPUT PORT 3 SERIAL DATA 3 MPU 3 LTC1290 CS LTC1290 8 CHANNELS CS AN62 F37 8 CHANNELS Figure 37. Multiple LTC1290s Sharing One Three-Wire Serial Interface 2 1 0 OUTPUT PORT 3-WIRE SERIAL INTERFACE TO OTHER PERIPHERALS OR LTC1094s 3 SERIAL DATA 3 MPU 3 CS LTC1094 3 CS LTC1094 CS LTC1094 AN62 F38 8 CHANNELS 8 CHANNELS 8 CHANNELS Figure 38. Multiple LTC1094s* Sharing One Three-Wire Serial Interface VCC 1µF 8-BIT SHIFT REGISTER CLK CLK 33 B0-B7 8 + – 12-BIT COUNTER ENA 1 B0-B7 EN CLK ENA 3, 14, 25, 36 DATA DATA 2 3 4 CS CLK CS +IN VCC LTC1196 CLK –IN DOUT GND VREF 8 23 7 34 6 35 ENA B7 EPM5064 CLK DATA 5 CS B0 RESERVE PINS OF EPM5064: 2, 4-8,15-20, 22, 24, 26-30 9-13, 21, 31, 32, 43 1 37 38 39 40 41 42 44 AN62 F39 Figure 39. Interfacing the LTC1196 to the Altera EPM5064 PLD *Increase resolution from 10 bits to 12 bits with the pin compatible LTC1294. AN62-19 Application Note 62 9V + LT1201-5 10µF 2MHz CLOCK OTHER CHANNELS OR SNEAK-A-BIT INPUTS CHO VCC CH1 ACLK MC68HC05C4 SCK SCLK CH2 DIN CH4 LTC1090 DOUT MOSI CH5 CS C0 CH6 REF + CH7 REF – COM V– CH3 VIN –5V TO 5V DGND MISO AGND 0.1µF AN62 F40 –5V Figure 40. SNEAK-A-BIT Circuit for the LTC1090: 11-Bit Resolution from a 10-Bit ADC PC SERIAL INTERFACE CIRCUITS + (NOTE 3) R 400k C 200pF 10µF 2N3906 220Ω (NOTE 1) 10k 1 ANALOG INPUTS ±5V RANGE 2 3 4 5 6 7 8 9 10 LTC1094 1Ω 20 19 18 17 16 15 14 13 12 11 = LOGIC GROUND LT1021-5 4 10Ω 2 NC + 10µF + 4.7µF 1µF + + 1µF 1µF D1 1N752A + 4.7µF 1 2 3 NC 18 17 16 15 4 5 LT1180A 6 10k + = CLEAN ANALOG GROUND 6 7 8 9 14 13 12 11 ON/OFF 5V DATA OUT CLOCK IN 5V (NOTE 2) 10 A/D DATA IN NOTE 1: 10k CURRENT LIMIT RESISTORS CAN BE REMOVED IF THE INPUTS ARE GUARANTEED NOT TO EXCEED THE LT1094’s SUPPLY VOLTAGES. NOTE 2: DRIVER OUTPUTS CAN BE PARALLEL FOR GREATER CURRENT DRIVE. NOTE 3: SELECT RC = 4tCLOCK, MINIMIZE C. NOTE 4: CONNECT THE CLEAN ANALOG GROUND AND THE LOGIC GROUND TOGETHER AT ONLY ONE POINT. AN62 F41 Figure 41. LTC1094 Analog-to-Digital Converter RS232 Serial Interface Using the LT1180A Dual Driver/Receiver AN62-20 Application Note 62 INPUT 7.2V TO 40V 74C14 1 V+ (UNREGULATED) 2 f0SC ≅ 300kHz 14, 13, 12, 11, 10, 4 C1 50pF R1 22k 2 + 10k 8 ANALOG INPUTS 0V TO 5V CH1 ACLK CH2 SCLK CH3 DIN CH4 DOUT LTC1290 CH5 CS CH6 REF + CH7 REF – COM V– DGND R6 100k D C4 47µF R7 1Ω 6 LT1021-5 6 Q RS232 POWERED 150µF OPTION (LTC1090 ONLY) D1 D2 1N4148 10 11 12 9 + C2 R2 50k 1 VREF 2 4 5 Q 74C74 3 ↑CLK 7 GND CLR VCC CHO VREF 5V 13 6 4 5 SCLK 4 (DTR) DIN 7 (RTS) DOUT 8 (CTS) R3 50k 3 8 AGND COM1 INPUT STATUS REGISTER MSB LSB B7 B6 B5 B4 B3 B2 B1 B0 X X X CTS X X X X 3FE 5 (GND) COM1 OUTPUT CONTROL REGISTER MSB LSB B7 B6 B5 B4 B3 B2 B1 B0 X X X X X X RTS DTR 3FC AN62 F42 Figure 42. LTC1290 to IBM PC Serial Port PARALLEL INTERFACE CIRCUITS A15 A0 MREQ ADDRESS BUS EN ADDRESS DECODE Z80 8085A D0 HBEN RD RD D7 AS CS BUSY WAIT DATA BUS A23 A1 A0 ADDRESS BUS EN ADDRESS DECODE MC68000 LTC1272 LTC1273 LTC1275 LTC1276 D0 D0/8 RD R/W D11 D7 CS BUSY DTACK DATA BUS D11 LTC1272 LTC1273 LTC1275 LTC1276 D0/8 HBEN ANALOG FRONT-END CIRCUITRY AND ADDITIONAL PINS OMITTED FOR CLARITY AN62 F43 Figure 43. LTC1272/LTC1273/LTC1275/LTC1276 to 8085A/ Z80 Microprocessor Hardware Parallel Interface ANALOG FRONT-END CIRCUITRY AND ADDITIONAL PINS OMITTED FOR CLARITY AN62 F44 Figure 44. LTC1272/LTC1273/LTC1275/LTC1276 to MC68000 Microproessor Hardware Parallel Interface AN62-21 Application Note 62 A16 A1 IS ADDRESS BUS PA2 PA0 ADDRESS DECODE DEN EN TMS320C25 PORT ADDRESS BUS EN ADDRESS DECODE TMS32010 CS CS BUSY READY RD R/W D16 DATA BUS D0 LTC1282 RD D11 D11 D0/8 D0 DATA BUS D11 D0/8 HBEN ANALOG FRONT-END CIRCUITRY AND ADDITIONAL PINS OMITTED FOR CLARITY ANALOG FRONT-END CIRCUITRY AND ADDITIONAL PINS OMITTED FOR CLARITY AN62 F45 Figure 45. LTC1282 to TMS320C25 DSP Processor Parallel Interface A16 A0 IS AN62 F46 ADDRESS BUS EN ADDRESS DECODE LTC1278 RD READY D0 BUSY DATA BUS D11 D0 CONVST SAMPLE CLOCK CS AN62 F47 ANALOG FRONT-END CIRCUITRY AND ADDITIONAL PINS OMITTED FOR CLARITY Figure 47. LTC1278 to TMS320C25 DSP Processor Parallel Interface REFERENCE CIRCUITS 9V 5V 300k 50k LT1034-2.5 VOUT 2.500V ±40mV TC (TYP/MAX) = 20/40ppm/°C 8-BIT (±4LSB) INITIAL ACCURACY 10-BIT ACCURACY OVER 0°C TO 70°C TEMPERATURE RANGE LT1004-2.5 VOUT 2.500V ±20mV TC (TYP) = 20ppm/°C 8-BIT (±2LSB) INITIAL ACCURACY 11-BIT TYPICAL ACCURACY OVER 0°C TO 70°C TEMPERATURE RANGE AN62 F48 AN62 F49 Figure 48. LT1034-2.5 2.5V Voltage Reference AN62-22 HBEN Figure 46. LTC1272/LTC1273/LTC1275/LTC1276 to TMS32010 DSP Processor Parallel Interface TMS320C25 D15 LTC1272 LTC1273 LTC1275 LTC1276 Figure 49. Battery-Powered LT1004-2.5 2.5V Voltage Reference Application Note 62 RL RL VIN VIN VOUT 2.500V ±10mV TC (TYP) = 50ppm/°C 8-BIT (±1LSB) INITIAL ACCURACY 9-BIT TYPICAL ACCURACY OVER 0°C TO 70°C TEMPERATURE RANGE CATHODE REF LT1431Z ANODE V+ VOUT 2.500V ±10mV TC (TYP) = 30ppm/°C 8-BIT (±1LSB) INITIAL ACCURACY 10-BIT TYPICAL ACCURACY OVER 0°C TO 70°C TEMPERATURE RANGE COLL REF LT1431 SGND AN62 F50 (3-PIN PACKAGE) FGND AN62 F51 (8-PIN PACKAGE) Figure 50. LT1431Z 2.5V Voltage Reference (3-Pin Package) Figure 51. LT1431 2.5V Voltage Reference (8-Pin Package) ANALOG INPUTS RL VIN V+ RTOP COLL REF V IN LT1431 AN62 F52 RMID SGND 8V TO 40V VOUT 5.00V ±50mV 8-BIT (±2.5LSB) TYPICAL ACCURACY VOUT + 2.2µF FGND * V CC SCLK CHO CH1 ACLK CH2 DOUT DIN CH3 CS CH4 CH5 CH6 LTC1290 CH7 COM TO µC REF + LT1027 REF – + 10k VTRIM 22µF AGND V– DGND GND AN62 F53 Figure 52. LT1431Z 5V Voltage Reference (8-Pin Package) * ±1mV TC (TYP/MAX) = 1/2ppm/°C (LT1027A, B) 12-BIT (±1LSB) INITIAL ACCURACY 15-BIT ACCURACY OVER 0°C TO 70°C TEMPERATURE RANGE Figure 53. LT1027 12-Bit Accurate 5V Voltage Reference Supplying Input Voltages to the LTC1290’s VREF and VCC Pins ADJUSTABLE REFERENCES 5V TO 35V 3.6k LT1021-5 IN GND OUT TRIM R1 27k 1N4148 R2 50k V OUT 5.00V ±2.5mV TC (TYP/MAX) = 2/5ppm/°C 11-BIT (±1LSB) INITIAL ACCURACY 14-BIT ACCURACY OVER 0°C TO 70°C TEMPERATURE RANGE LT1009 10k* TRIM VOUT 2.500V ±5mV TC (TYP/MAX) = 15/25ppm/°C 9-BIT (±1LSB) INITIAL ACCURACY 10-BIT ACCURACY OVER 0°C TO 70°C TEMPERATURE RANGE AN62 F55 AN62 F54 * DOES NOT AFFECT TEMPERATURE COEFFICIENT. ±5% TRIM RANGE Figure 54. LT1021-5 Adjustable 5V Voltage Reference Figure 55. LT1009 2.5V Voltage Reference with ±5% Trim Range AN62-23 Application Note 62 APPENDIX A 8-BIT 10-BIT µPOWER SO-8 3V OR 5V MULTIPLEXED MULTIPLEXED WITH SHUTDOWN COMPLETE HIGH SPEED 5V POWERED 5V POWERED 5V POWERED LTC1096 – 1 CHANNEL LTC1098 – 2 CHANNEL 12-BIT LTC1286 – 1 CHANNEL LTC1290 – 8 CHANNEL LTC1291 – 2 CHANNEL LTC1292 – 1 CHANNEL LTC1293 – 6 CHANNEL LTC1294 – 8 CHANNEL LTC1296 – 8 CHANNEL LTC1297 – 1 CHANNEL LTC1298 – 2 CHANNEL LTC1090 – 8 CHANNEL LTC1091 – 2 CHANNEL LTC1092 – 1 CHANNEL LTC1093 – 6 CHANNEL LTC1094 – 8 CHANNEL LTC1095 – WITH REFERENCE FAST SO-8 3V OR 5V LTC1196 – 1Msps LTC1198 – 750ksps 2-CHANNEL 3V POWERED DYNAMIC LTC1283 – 8 CHANNEL 3V POWERED LTC1285 – 1 CHANNEL LTC1287 – 1 CHANNEL LTC1288 – 2 CHANNEL LTC1289 – 8 CHANNEL LT574A SECOND SOURCE LTC1272 – 250ksps 7572 UPGRADE LTC1273 – 300ksps 0V TO 5V INPUT LTC1275 – 300ksps ±2.5V INPUT LTC1276 – 300ksps ±5V INPUT LTC1278 – 500ksps/400ksps ±2.5V OR 0V TO 5V INPUT LTC1279 – 600ksps ±2.5V OR 0V TO 5V INPUT 3V POWERED LTC1282 – 140ksps DYNAMIC DC MONITORING AN62 AF01 Analog-to-Digital Converter Selection Guide PART NUMBER DESCRIPTION RESOLUTION TOTAL UNADJUSTED ERROR SAMPLE VOLTAGE RATE SUPPLY MAXIMUM SUPPLY CURRENT PKGS AVAIL IMPORTANT FEATURES LTC1090C,M 10-Bit, Serial I/O, A/D Converter with 8-Channel Multiplexer. Full Duplex Serial Interface. 10 Bits ±0.5LSB (LTC1090A) Over Full Temperature Range 35ksps 5V, 10V, or ±5V 2.5mA J, N, S 10-Bit ADC with Built-In 8-Channel Analog MUX and Sample-and-Hold. Compatible with All Microprocessors’ Serial Ports. Software Configuable Bipolar or Unipolar Operation. Full Duplex Serial I/O. LTC1091C,M 10-Bit, 8-Pin Serial I/O, A/D Converter with 2-Channel Analog Multiplexer. 10 Bits ±0.5LSB (LTC1091A) Over Full Temperature Range 31ksps 5V or 10V 3.5mA J8, N8 LTC1092C,M 10-Bit, 8-Pin, A/D Converter with Serial Output. 10 Bits ±0.5LSB (LTC1092A) Over Full Temperature Range 38ksps 5V or 10V 2.5mA J8, N8 10-Bit ADC with Built-In 2-Channel Analog MUX and Sample-and-Hold. Compatible with All Microprocessors’ Serial Ports. Unipolar Operation. Separate Reference Pin Allows Reduced Span (Down to 220mV) Operation. Unipolar ADCs Are Performed on a Differential Input Pair. Compatible with All Microprocessors’ Serial Ports. LTC1093C,M 10-Bit, Serial I/O, A/D Converter with 6-Channel Multiplexer. 10 Bits ±0.5LSB (LTC1093A) Over Full Temperature Range 26ksps 5V, 10V, or ±5V 2.5mA J, N, S AN62-24 1-Bit ADC with Built-In 6-Channel Analog MUX and Sample-and-Hold. Compatible with All Microprocessors’ Serial Ports. Software Configurable Bipolar or Unipolar Operation. Half Duplex Serial I/O. Application Note 62 PART NUMBER DESCRIPTION RESOLUTION TOTAL UNADJUSTED ERROR SAMPLE VOLTAGE RATE SUPPLY MAXIMUM SUPPLY CURRENT PKGS. AVAIL. IMPORTANT FEATURES LTC1094C,M 10-Bit, Serial I/O. A/D Converter System with 8-Channel Multiplexer. 10 Bits ±0.5LSB (LTC1094A) Over Full Temperature Range 26ksps 5V, 10V, or ±5V 2.5mA J, N LTC1095C,M 10-Bit, Serial I/O, A/D Converter with 6-Channel Multiplexer and 5V Buried Zener Reference. 10 Bits ±0.15% FSR 26ksps 7.2V to 10V 3.7mA J LTC1096C 8-Bit, 16µs, Micropower, Sampling A/D Converter with Serial I/O and Differential Input. 8 Bits ±0.5LSB (LTC1096A) Over Full Temperature Range 33ksps 3V to 9V 180µA, 3µA During Shutdown N8, S8 Single Differential Input, Sample-andHold with Single-Ended Inputs. Ultra-Low Power, Automatic PowerDown Mode. LTC1098C 8-Bit, 16µs, Micropower, Sampling A/D Converter with Serial I/O and 2-Channel MUX. 8 Bits ±0.5LSB (LTC1098A) Over Full Temperature Range 33ksps 3V to 9V N8, S8 2-Channel Multiplexer, Sampling ADC. Ultra-Low Power, Automatic PowerDown Mode. LTC1099C,M 8-Bit, 2µs A/D Converter with Built-in Sample-and-Hold. Parallel Output. 8 Bits ±1LSB Over Full Temperature Range 256ksps 5V 230µA, 3µA During Shutdown 15mA J, N, S Built-in Sample-and-Hold Allows Direct Conversion of 5VP-P Signals up to 156kHz. Pin Compatible with ADC0820 and AD7820. LTC1196C 8-Bit, 8-Pin, Serial I/O, 600ns, 1MHz, Sampling A/D Converter with Automatic Power-Down. 8-Bit, 8-Pin, Serial I/O, 600ns, 750kHz, Sampling A/D Converter with 2-Channel Analog MUX and Automatic Power-Down. 12-Bit, 3µs, 250ksps Sampling A/D Converter with Parallel Output. Single 5V Supply. Input Range: 0V ≤ VIN ≤ 5V. 8 Bits ±0.5LSB Over Full Temperature Range 1Msps 3V to 6V 10mA N, S 8 Bits ±0.5LSB Over Full Temperature Range 750ksps 3V to 6V 10mA, 3µA During Shutdown N, S 12 Bits ±0.5LSB Linearity, ±1LSB Differential Nonlinearity, and ±4LSB Offset Error Over Full Temperature Range. ±10LSB Full-Scale Error. 72dB SINAD and –82dB THD at fIN = 10kHz. ±0.5LSB Linearity, ±0.75LSB Differential Nonlinearity, and ±4LSB Offset Error Over Full Temperature Range. ±10LSB Full-Scale Error. 70dB SINAD and – 74dB THD at fIN = 150kHz. 250ksps (111ksps also available) 5V 30mA J, N, S 8-Bit ADC with Built-In Sample-andHold. Compatible with All Microprocessors’ Serial Ports. Full Duplex Serial I/O. 8-Bit ADC with Built-In Sample-andHold. Compatible with All Microprocessors’ Serial Ports. Full Duplex Serial I/O. 2-Channel Analog MUX and Automatic Power-Down. Single Supply 12-Bit ADC with Built-In Sample-and-Hold and 250ksps Conversion Rate. Built-In 2.42V Reference. Plug-In Upgrade for AD7572. Operates with or without –15V Supply Required by AD7572. 300ksps 5V 25mA J, N, S ±5V 25mA N, S LTC1198C LTC1272C,M LTC1273C,M 12-Bit, 2.7µs, 300ksps Sampling A/D Converter with Parallel Output. Single 5V Supply. Input Range: 0V ≤ VIN ≤ 5V. 12 Bits LTC1275C 12-Bit, 2.7µs, 300ksps, Sampling A/D Converter with Parallel Output. Split ±5V Supply. Input Range: – 2.5V ≤ VIN ≤ 2.5V. 12 Bits ±0.5LSB Linearity, 300ksps ±0.75LSB Differential Nonlinearity, and ±4LSB Offset Error Over Full Temperature Range. 70dB SINAD and –74dB THD at fIN = 150kHz. ±10LSB Full-Scale Error. 10-Bit ADC with Built-In 8-Channel Analog MUX and Sample-and-Hold. Compatible with All Microprocessors’ Serial Ports. Software Configurable Bipolar or Unipolar Operation. Half Duplex Serial I/O. 10-Bit ADC with Built-In 6-Channel Analog MUX, Sample-and-Hold, and 5V Buried Zener Reference. Compatible with All Microprocessors’ Serial Ports. Software Configurable Bipolar or Unipolar Operation. Half Duplex Serial I/O. Single Supply 12-Bit ADC with Built-In Sample-and-Hold, Internal Clock, and 300ksps Conversion Rate. Built-In 2.42V Reference. Split Supply 12-Bit ADC with Built-In Sample-and-Hold, Internal Clock, and 300ksps Conversion Rate. Built-In 2.42V Reference. AN62-25 Application Note 62 PART NUMBER DESCRIPTION RESOLUTION TOTAL UNADJUSTED ERROR SAMPLE VOLTAGE RATE SUPPLY MAXIMUM SUPPLY CURRENT PKGS. AVAIL. IMPORTANT FEATURES LTC1276C 12-Bit, 2.7µs, 300ksps Sampling A/D Converter with Parallel Output. Split ±5V Supply. Input Range: – 5V ≤ VIN ≤ 5V. 12 Bits ±0.5LSB Linearity, 300ksps ±0.75LSB Differential Nonlinearity, and ±4LSB Offset Error Over Full Temperature Range. 70dB SINAD and – 74dB THD at fIN = 150kHz. ±10LSB Full-Scale Error. ±5V 25mA N, S Split Supply 12-Bit ADC with Built-In Sample-and-Hold, Internal Clock, and 300ksps Conversion Rate. Built-In 2.42V Reference. LTC1278C,I 12-Bit, 1.6µs, 500ksps Sampling A/D Converter with Parallel Output. Input Range with Split ±5V Supply: – 2.5V ≤ VIN ≤ 2.5V; with 5V Supply: 0V ≤ VIN ≤ 5V. 12 Bits ±1LSB Linearity, 500ksps ±1LSB Differential (400ksps Nonlinearity, and ±6LSB also Offset Error Over available) Full Temperature Range. 70dB SINAD and – 74dB THD at fIN = 250kHz. ±15LSB Gain Error. 5V or ±5V 30mA, 3mA During Shutdown N, S Single or Split Supply 12-Bit ADC with Built-In Sample-and-Hold, Internal Clock, and 500ksps Conversion Rate. Built-In 2.42V Reference. Guaranteed 70dB SINAD and –78 THD at 100kHz Input Frequency Over Temperature. LTC1279C,I 12-Bit, 1.4µs, 600ksps Sampling A/D Converter with Parallel Output. Input Range with 5V Supply: 0V ≤ VIN ≤ 5V; with Split ±5V Supply: – 2.5V ≤ VIN ≤ 2.5V. 5V or ±5V 20mA, 3mA During Shutdown N, S Single or Split Supply 12-Bit ADC with Built-In Sample-and-Hold, Internal Clock, and 600ksps Conversion Rate. Built-In 2.42V Reference. Guaranteed 70dB SINAD and –78dB THD at 100kHz Input Frequency Over Temperature. LTC1282C 12-Bit, 6µs, 140ksps Sampling A/D Converter with Parallel Output. Input Range with Single 3V Supply: 0V ≤ VIN ≤ 2.5V; with Split ±3V Supply: – 1.25V ≤ VIN ≤ 1.25V. 3V or ±3V 8mA N, S Single or Split Supply 12-Bit ADC with a 2.7V Guaranteed Minimum Supply Voltage. Complete with Sample-andHold, Internal Clock and a 25ppm/°C 1.2V Reference. LTC1283C 10-Bit, 44µs, 3.3V or ±3.3V Sampling A/D Converter with Serial Output. Input Range with Split ±3.3V Supply: – 2.5V ≤ VIN ≤ 2.5V; with 3.3V Supply: 0V ≤ VIN ≤ 2.5V. ±1LSB Linearity, 600ksps ±1LSB Differential Nonlinearity, and ±6LSB Offset Error Over Full Temperature Range. 70dB SINAD and – 74dB THD at fIN = 300kHz. ±15LSB Gain Error. 12 Bits ±0.5LSB Linearity, 140ksps ±0.75LSB Differential Nonlinearity, and ±4LSB Offset Error Over Full Temperature Range. 69dB SINAD and – 77dB THD at fIN = 70kHz. ±10LSB Full-Scale Error. 10 Bits ±0.5LSB Linearity and 15ksps ±0.5LSB Offset Error Over Full Temperature Range. 3.3V or ±3.3V 350µA N, S 3.3V or ±3.3V Supply 10-Bit ADC with Built-In Sample-and-Hold. 10-Bit Unipolar or 9-Bit + Sign Bipolar Serial Output. Compatible with All Microprocessors’ Serial Ports. Full Duplex Serial I/O. LTC1285C 12-Bit, 8-Pin Serial I/O, 160µA (Typ) 3V Sampling A/D Converter with Automatic Power-Down and Differential Analog Input. 12 Bits 3V 320µA, 3µA During Shutdown N, S 12-Bit ADC with Built-In Sample-andHold. Operates on 3V Supply Voltage. Compatible with All Microprocessors’ Serial Ports. Automatic Power-Down. LTC1286C,I 12-Bit, 8-Pin Serial I/O, 250µA (Typ) Sampling A/D Converter with Automatic Power-Down. 12 Bits ±2LSB Linearity, ±0.75LSB Differential Nonlinearity, ±3LSB Offset, and ±8LSB Full-Scale Error Over Full Temperature Range. 12.5ksps 5V to 9V 500µA, 3µA During Shutdown N, S 12-Bit ADC with Built-In Sample-andHold. Compatible with All Microprocessors’ Serial Ports. Automatic Power Down. LTC1287C,I 12-Bit, 33µs, 3.3V Sampling A/D Converter with Serial Output. Input Range with 3.3V Supply: 0V ≤ VIN ≤ 3.3V. 12 Bits ±0.5LSB Linearity, ±3LSB Offset, and ±0.5LSB Full-Scale Error Over Full Temperature Range. 30ksps 2.7V to 3.3V 5mA J, N, 12-Bit ADC with Built-In Sample-andHold. Guaranteed Operation on a 2.7V Supply. Compatible with All Microprocessors’ Serial Ports. AN62-26 12 Bits ±2LSB Linearity, 7.5ksps ±0.75LSB Differential Nonlinearity, ±3LSB Offset, and ±8LSB FullScale Error Over Full Temperature Range. Application Note 62 PART NUMBER RESOLUTION DESCRIPTION TOTAL UNADJUSTED ERROR SAMPLE VOLTAGE RATE SUPPLY ±2LSB Linearity, 6.6ksps ±0.75 Differential Nonlinearity, ±3LSB Offset, and ±8LSB FullScale Error Over Full Temperature Range. LLTC1288C 12-Bit, 8-Pin, Serial I/O, 210µA (Typ) 3V Sampling A/D Converter with Automatic Power-Down, Differential Analog Input and 2-Channel Multiplexer. 12 Bits LTC1289C,I 12-Bit, 40µs, 3.3V or ±3.3V, Sampling A/D Converter with 8-Channel MUX and Serial Output. Input Range with Split ±3.3V Supply: – 3.3V ≤ VIN ≤ 3.3V; with 3.3V Supply: 0V ≤ VIN ≤ 3.3V. 12 Bits ±0.5LSB Linearity, ±1.5LSB Offset, and ±0.5LSB Full-Scale Error Over Full Temperature Range. LTC1290C,I,M 12-Bit, 8-Pin Serial I/O, A/D Converter with 8-Channel Multiplexer. Full Duplex Serial Interface. 12 Bits LTC1291C,I,M 12-Bit, 12µs, 5V, Sampling A/D Converter with Serial Output. Input Range: 0V ≤ VIN ≤ 5V. 12 Bits LTC1292C,I,M 12-Bit, 8-Pin A/D Converter Serial Output. 12 Bits LTC1293C,I,M 12-Bit, Serial I/O, A/D Converter System with 6-Channel Multiplexer. 12 Bits LTC1294C,I,M 12-Bit, Serial I/O, A/D Converter System with 8-Channel Multiplexer. 12 Bits LTC1296C,I,M 12-Bit, Serial I/O, A/D Converter System with 8-Channel Multiplexer. LTC1297C,I,M 12-Bit, 20µs, 5V, Sampling A/D Converter with Differential Input and Serial Output. Input Range with 5V Supply: 0V ≤ VIN ≤ 5V. LTC1298C,I 12-Bit, 8-Pin, Serial I/O, 340µA (Typ) Sampling A/D Converter with Automatic Power-Down. MAXIMUM SUPPLY CURRENT PKGS. AVAIL. IMPORTANT FEATURES 3V 390µA, 3µA During Shutdown N, S 12-Bit ADC with Built-In Sample-andHold. Operates on 3V Supply Voltage. Compatible with All Microprocessors’ Serial Ports. Automatic Power-Down. 2-Channel Multiplexer. 25ksps 2.7V to 3.3V or ±2.7V to ±3.3V 5mA, 10µA During Shutdown J, N, S 12-Bit ADC with Built-In Sample-andHold and 8-Channel MUX. Guaranteed Operation on a 2.7V Supply. Compatible with All Microprocessors’ Serial Ports. Automatic Power-Down. ±0.5LSB Linearity, ±1.5LSB Offset, and ±0.5LSB Full-Scale Error Over Full Temperature Range. 50ksps 5V or ±5V 12mA J, N, S 12-Bit ADC with Built-In 8-Channel Analog MUX and Sample-and-Hold. Compatible with All Microprocessors’ Serial Ports. Software Configurable Bipolar or Unipolar Operation. Full Duplex Serial I/O. ±0.5LSB Linearity, ±3LSB Offset, and ±1LSB Full-Scale Error Over Full Temperature Range. ±0.5LSB Linearity, ±3LSB Offset, and ±0.5LSB Full-Scale Error Over Full Temperature Range. ±0.5LSB Linearity, ±3LSB Offset, and ±0.5LSB Full-Scale Error Over Full Temperature Range. 54ksps 2.7V to 3.3V or ±3.3V 5V 12mA, 10µA During Shutdown J, N 12-Bit ADC with Built-In Sample-andHold. Compatible with All Microprocessors’ Serial Ports. Automatic Power-Down. 12mA J, N 46ksps 5V or ±5V 12mA J, N 12-Bit ADC, Unipolar Conversion of Single Differential Input. Separate Reference Pin Allows Reduced Span. Compatible with All Microprocessors’ Serial Ports. 12-Bit ADC with Built-In 6-Channel MUX and Sample-and-Hold. Compatible with All Microprocessors’ Serial Ports. Software Configurable Bipolar or Unipolar Operation. Full Duplex Serial I/O. ±0.5LSB Linearity, ±3LSB Offset, and ±0.5LSB Full-Scale Error Over Full Temperature Range. 46ksps 5V or ±5V 12mA J, N 12 Bits ±0.5LSB Linearity, ±3LSB Offset, and ±0.5LSB Full-Scale Error Over Full Temperature Range. 46ksps 5V or ±5V 12mA, 10µA During Shutdown J, N 12 Bits ±0.5LSB Linearity, ±3LSB Offset, and ±1LSB Full-Scale Error Over Full Temperature Range. ±2LSB Linearity, ±0.75LSB Differential Nonlinearity, ±3LSB Offset, and ±8LSB Full-Scale Error Over Full Temperature Range. 20ksps 5V 12mA, 10µA During Shutdown J, N 11.1ksps 5V to 9V 640µA, 3µA During Shutdown N, S 12 Bits 60ksps 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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. 12-Bit ADC with Built-In 8-Channel MUX and Sample-and-Hold. Compatible with All Microprocessors’ Serial Ports. Software Configurable Bipolar or Unipolar Operation. Half Duplex Serial I/O. 12-Bit ADC with Built-In 8-Channel MUX and Sample-and-Hold. Compatible with All Microprocessors’ Serial Ports. Software Configurable Bipolar or Unipolar Operation. Programmable Power-Down Includes a System Shutdown Output. 12-Bit ADC with Built-In Sample-andHold. Compatible with All Microprocessors Serial Ports. Automatic Power-Down. 12-Bit ADC with Built-In Sample-andHold and 2-Channel MUX. Compatible with All Microprocessors Serial Ports. Automatic Power-Down. AN62-27 Application Note 62 Digital-to-Analog Converter Selection Guide PART NUMBER LTC1257C,I DESCRIPTION 12-Bit, Serial I/O, 8-Pin D/A Converter. Cascadable Serial I/O. Internal 2.048V Reference. Voltage Output. RESOLUTION 12 Bits TOTAL UNADJUSTED ERROR SETTLING VOLTAGE TIME SUPPLY ±0.5LSB DNL, ±3.5LSB INL 6µs (±1/2LSB) 5V to 15.5V MAXIMUM SUPPLY CURRENT 600µA at VCC = 5V PKGS. AVAIL. IMPORTANT FEATURES N, S 12-Bit DAC with Cascadable Serial I/O, Built-In Reference, and Voltage Output. Wide Supply Range of 5V to 15.5V. Space Saving SO-8 Package. APPENDIX B VOLTAGE REFERENCES Listed by Temperature Drift (T.C.) and Initial Accuracy 4.5V OUTPUT 1.25V OUTPUT T.C. *LT1034B-1.2 *LT1034-1.2 *LT1004-1.2 *LM385B-1.2 *LM385-1.2 ACCURACY *LT1004-1.2 *LT1034B-1.2 *LT1034-1.2 *LM385B-1.2 *LM385-1.2 2.5V OUTPUT T.C. LT1019C-2.5 LT1009C-2.5 LT580M LT1034B-2.5 LT580L *LT1004C-2.5 LT1034-2.5 LT580K *LM385B-2.5 LM336B-2.5 *LM385-2.5 LM336-2.5 ACCURACY LT580M LT1019C-2.5 LT1009-2.5 LT580L LT1034-2.5 LT580K *LT1004C-2.5 *LM385B-2.5 *LM385-2.5 LT580J LM336B-2.5 LM336-2.6 T.C. LT1019C-4.5 5V OUTPUT T.C. LT1027C-5 LT1027D-5 LT1027E-5 LT1021C-5 LT1019-5 LT1029A REF-02E REF-02H LT1021B-5 LT1021D-5 LT1029 REF-02C REF-02D ACCURACY LT1027C-5 LT1021B-5 LT1027D-5 LT1027E-5 REF-02E LT1019-5 LT1021C-5 LT1021D-5 LT1029A REF-02H LT1029 REF-02C REF-02D T.C. LT1021B-7 LT1021D-7 LT1034 ACCURACY LT1021B-7 LT1021D-7 LT1034 10V OUTPUT T.C. LT1021C-10 LT1031C LT581K LT1019-10 LT1031D LT581J REF-01E LT1021B-10 LT1021D-10 LT1031B REF-01H REF-01C ACCURACY LT1021B-10 LT1031B-10 REF-01E LT1031C LT581K LT1019-10 LT1021C-10 LT1021D-10 LT1031D REF-01H LT581J REF-01C 6.9V TO 6.95V OUTPUT T.C. LTZ1000 LM399A LM399 LM329A LM329B LM329C Linear Technology Corporation AN62-28 ACCURACY LT1019C-4.5 7V OUTPUT ACCURACY LM329A LTZ1000 LM329B LM329C LM329D LM399A *Micropower AN62 BF01 LT/GP 1094 10K • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7487 (408) 432-1900 ● FAX: (408) 434-0507 ● TELEX: 499-3977 LINEAR TECHNOLOGY CORPORATION 1994