LINEAR TECHNOLOGY LTC1285 LTC1288 Data Sheet User Guide
Summary
Ideal for building low-power, battery-operated sensing equipment, these 12-bit micropower A/D converters provide high accuracy with ultra-low supply current consumption. Designed for remote data acquisition and systems requiring single-supply operation (3V–6V), they feature advanced capabilities like auto-shutdown to conserve power for demanding applications such as temperature monitoring. This guide covers technical specifications, integration details for both single differential inputs and dual multiplexing, and guidelines for system designers implementing reliable, high-precision signal capture.
Page 1 Text Content
LTC1285/LTC1288 3V Micropower Sampling 12-Bit A/D Converters in SO-8 Packages
FEATURES DESCRIPTION 12-Bit Resolution The LTC®1285/LTC1288 are 3V micropower, 12-bit, suc- 8-Pin SO Plastic Package cessive approximation sampling A/D converters. They Low Cost typically draw only 160µA of supply current when con- Low Supply Current: 160µA Typ verting and automatically power down to a typical supply Auto Shutdown to 1n A Typ current of 1n A whenever they are not performing conver- Guaranteed ±3/4LSB Max DNL sions. They are packaged in 8-pin SO packages and Single Supply 3V to 6V Operation operate on 3V to 6V supplies. These 12-bit, switched- Differential Inputs (LTC1285) capacitor, successive approximation ADCs include 2-Channel MUX (LTC1288) sample-and-holds. The LTC1285 has a single differential On-Chip Sample-and-Hold analog input. The LTC1288 offers a software selectable 100µs Conversion Time 2-channel MUX.
Sampling Rates:
On-chip serial ports allow efficient data transfer to a wide
7.5ksps (LTC1285)
range of microprocessors and microcontrollers over three
SU PP LY UR RE NT (µ A)
6.6ksps (LTC1288)
wires. This, coupled with micropower consumption, makes
I/O Compatible with SPI, Microwire, etc.
remote location possible and facilitates transmitting data through isolation barriers.
APPLICATIONS
These circuits can be used in ratiometric applications or
Pen Screen Digitizing
with an external reference. The high impedance analog
Battery-Operated Systems
inputs and the ability to operate with reduced spans (to
Remote Data Acquisition
1.5V full scale) allow direct connection to sensors and
Isolated Data Acquisition
transducers in many applications, eliminating the need for
Battery Monitoring
gain stages.
Temperature Measurement
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIONS N 12µW, S0-8 Package, 12-Bit ADC Supply Current vs Sample Rate Samples at 200Hz and Runs Off a 3V Supply
TA = 25°C 3V1µF VCC = 2.7V VREF = 2.5V f CLK = 120k Hz
MPU (e.g., 8051)
VREF VCC P1.4
+IN CLK P1.3
ANALOG INPUT
LTC1285
0V TO 3V RANGE
–IN DOUT P1.2
SERIAL DATA LINK
GND CS/SHDN
LTC1285/88 • TA01
SAMPLE FREQUENCY (k Hz)
LTC1285/88 • TA02
Page Summary Contents For LINEAR TECHNOLOGY LTC1285 LTC1288 Data Sheet User Guide
Manual Details
| Brand | Linear |
|---|---|
| Pages | 24 |
| File Size | 342.49 KB |
| Published | July 16, 2026 |
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Frequently Asked Questions
What is the maximum supply current?
The device typically draws only 160μA of supply current and can auto-shutdown to a typical current of 1nA.
Which model has a built-in multiplier (MUX)?
The LTC1288 offers a software selectable 2-channel MUX, while the LTC1285 has a single differential analog input.
What are these chips compatible with in data transmission?
They are compatible with SPI, Microwire, etc., allowing for efficient data transfer to microprocessors and microcontrollers.
What voltage range can the device operate on?
The devices operate on a single supply voltage ranging from 3V to 6V.