LTC1298| Datasheet

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FEATURES
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LTC1286/LTC1298 Micropower Sampling 12-Bit A/D Converters In S0-8 Packages DESCRIPTION
The LTC1286/LTC1298 are micropower, 12-bit, successive approximation sampling A/D converters. They typically draw only 250uA of supply current when converting and automatically power down to a typical supply current of 1nA whenever they are not performing conversions. They are packaged in 8-pin SO packages and operate on 5V to 9V supplies. These 12-bit, switched-capacitor, successive approximation ADCs include sample-and-holds. The LTC1286 has a single differential analog input. The LTC1298 offers a software selectable 2-channel MUX. On-chip serial ports allow efficient data transfer to a wide range of microprocessors and microcontrollers over three wires. This, coupled with micropower consumption, makes remote location possible and facilitates transmitting data through isolation barriers. These circuits can be used in ratiometric applications or with an external reference. The high impedance analog inputs and the ability to operate with reduced spans (to 1.5V full scale) allow direct connection to sensors a
nd transducers in many applications, eliminating the need for gain stages.

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12-Bit Resolution 8-Pin SOIC Plastic Package Low Cost Low Supply Current: 250uA Typ. Auto Shutdown to 1nA Typ. Guaranteed 3/4LSB Max DNL Single Supply 5V to 9V Operation On-Chip Sample-and-Hold 60us Conversion Time Sampling Rates: 12.5 ksps (LTC1286) 11.1 ksps (LTC1298) I/O Compatible with SPI, Microwire, etc. Differential Inputs (LTC1286) 2-Channel MUX (LTC1298) 3V Versions Available: LTC1285/LTC1288

APPLICATIONS
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Battery-Operated Systems Remote Data Acquisition Battery Monitoring Handheld Terminal Interface Temperature Measurement Isolated Data Acquisition

TYPICAL APPLICATIONS N
25uW, S0-8 Package, 12-Bit ADC Samples at 200Hz and Runs Off a 5V Supply
4.7uF 5V

Supply Current vs Sample Rate
1000 TA = 25 C VCC = VREF = 5V fCLK = 200kHz 100

MPU (e.g., 8051) 1 ANALOG INPUT 0V TO 5V RANGE 2 3 4 VREF +IN IN GND VCC LTC1286 CLK DOUT CS/SHDN 8 7 6 5 SERIAL DATA LINK
LTC1286/98 TA01

P1.4 P1.3 P1.2

SUPPLY CURRENT (uA)

10

1 0.1k 1k 10k SAMPLE FREQUENCY (Hz) 100k

U

U

U

LTC1286/98 TA02

1

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LTC1298 DATASHEET