LTC1594/LTC1598 4- and 8-Channel, Micropower Sampling 12-Bit Serial I/O A/D Converters FEATURES DESCRIPTIO 12-Bit Resolution The LTC 1594/LTC1598 are micropower, 12-bit sampling Auto Shutdown to 1nA A/D converters that feature 4- and 8-channel multiplexers, Low Supply Current: 320 A Typ respectively. They typically draw only 320A of supply Guaranteed 3/4LSB Max DNL current when converting and automatically power down to Single Supply 5V Operation a typical supply current of 1nA between conversions. The (3V Versions Available: LTC1594L/LTC1598L) LTC1594 is available in a 16-pin SO package and the Multiplexer: 4-Channel MUX (LTC1594) LTC1598 is packaged in a 24-pin SSOP. Both operate on 8-Channel MUX (LTC1598) a 5V supply. The 12-bit, switched-capacitor, successive Separate MUX Output and ADC Input Pins approximation ADCs include a sample-and-hold. MUX and ADC May Be Controlled Separately On-chip serial ports allow efficient data transfer to a wide Sampling Rate: 16.8ksps range of microprocessors and microcontrollers over three TM I/O Compatible with QSPI, SPI and MICROWIRE , etc. or four wires. This, coupled with micropower consump- Small Package: 16-Pin Narrow SO (LTC1594) tion, makes remote location possible and facilitates trans- 24-Pin SSOP (LTC1598) mitting data through isolation barriers. U APPLICATIO S The circuit can be used in ratiometric applications or with an external reference. The high impedance analog inputs Pen Screen Digitizing and the ability to operate with reduced spans (to 1.5V full Battery-Operated Systems scale) allow direct connection to sensors and transducers Remote Data Acquisition in many applications, eliminating the need for gain stages. Isolated Data Acquisition , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Battery Monitoring All other trademarks are the property of their respective owners. Temperature Measurement TYPICAL APPLICATIO 24W, 4-Channel, 12-Bit ADC Samples at 200Hz and Runs Off a 5V Supply OPTIONAL ADC FILTER Supply Current vs Sample Rate 5V 1k 1000 1F T = 25C A V = 5V CC 18 17 16 15, 19 1F V = 5V REF MUXOUT ADCIN V V f = 320kHz REF CC CLK 20 CH0 SERIAL DATA LINK 100 MICROWIRE AND 21 CH1 10 CSADC SPI COMPATABLE 22 CH2 6 CSMUX ANALOG 23 CH3 5, 14 12-BIT 8-CHANNEL INPUTS CLK + SAMPLING MPU 24 CH4 MUX 7 0V TO 5V 10 D ADC IN RANGE 1 CH5 11 D OUT 2 CH6 12 3 CH7 NC 13 8 COM 1 NC GND 0.1 1 10 100 1594/98 TA01 SAMPLE FREQUENCY (kHz) 4, 9 1594/98 TA02 15948fb 1 SUPPLY CURRENT (A) U ULTC1594/LTC1598 ABSOLUTE AXI U RATI GS (Notes 1, 2) Supply Voltage (V ) to GND................................... 12V Power Dissipation.............................................. 500mW CC Voltage Operating Temperature Range Analog Reference .................... 0.3V to (V + 0.3V) LTC1594CS/LTC1598CG ......................... 0C to 70C CC Analog Inputs .......................... 0.3V to (V + 0.3V) LTC1594IS/LTC1598IG ..................... 40C to 85C CC Digital Inputs .........................................0.3V to 12V Storage Temperature Range ................. 65C to 150C Digital Output .......................... 0.3V to (V + 0.3V) Lead Temperature (Soldering, 10 sec).................. 300C CC UUW PACKAGE/ORDER I FOR ATIO TOP VIEW ORDER PART ORDER PART NUMBER NUMBER 1 CH4 CH5 24 TOP VIEW 2 CH3 CH6 23 CH0 1 16 V LTC1594CS LTC1598CG CC 3 CH2 CH7 22 CH1 2 15 MUXOUT LTC1594IS LTC1598IG 4 CH1 GND 21 CH2 3 14 D IN 5 CH0 CLK 20 CH3 4 13 CSMUX 6 V CSMUX 19 CC ADCIN 5 12 CLK 7 MUXOUT D 18 IN V 6 11 V REF CC 8 ADCIN COM 17 COM 7 10 D OUT 9 V GND 16 REF GND 8 9 CSADC 10 V CSADC 15 CC 11 CLK D 14 S PACKAGE OUT 16-LEAD PLASTIC SO 12 NC NC 13 T = 125C, = 120C/ W JMAX JA G PACKAGE 24-LEAD PLASTIC SSOP T = 150C, = 110C/ W JMAX JA Order Options Tape and Reel: Add TR Lead Free: Add PBF Lead Free Tape and Reel: Add TRPBF Lead Free Part Marking: