LINEAR TECHNOLOGY LTC1090 User Guide
Summary
The LTC1090 is a high-precision, programmable 10-Bit Data Acquisition System designed for robust signal conversion. Featuring an 8-channel multiplexer that supports both single-ended and differential inputs, it records data in up to 16 bits while maintaining compatibility with established serial interfaces (up to 30kHz). This manual provides comprehensive technical specifications, detailed timing requirements, error characteristics, and operational parameters for engineers building advanced measurement or embedded systems.
Page 1 Text Content
LTC1090
Single Chip 10-Bit Data Acquisition System
FEATURES DESCRIPTIO Software Programmable Features: The LTC®1090 is a data acquisition component which Unipolar/Bipolar Conversions contains a serial I/O successive approximation A/D con- 4 Differential/8 Single Ended Inputs verter. It uses LTCMOSTM switched capacitor technology MSB or LSB First Data Sequence to perform either 10-bit unipolar, or 9-bit plus sign bipolar Variable Data Word Length A/D conversions. The 8-channel input multiplexer can be
Built-In Sample and Hold configured for either single ended or differential inputs (or Single Supply 5V, 10V or ±5V Operation combinations thereof). An on-chip sample and hold is
Direct 4 Wire Interface to Most MPU Serial Ports and included for all single ended input channels. All MPU Parallel Ports
The serial I/O is designed to be compatible with industry
30k Hz Maximum Throughput Rate
standard full duplex serial interfaces. It allows either MSB or LSB first data and automatically provides 2’s KEY SPECIFICATIO S complement output coding in the bipolar mode. The output data word can be programmed for a length of 8, 10,
Resolution: 10 Bits
12 or 16 bits. This allows easy interface to shift registers
ER RO (L SB s)
Total Unadjusted Error (LTC1090A): ±1/2LSB Max
and a variety of processors.
Conversion Time: 22µs
The LTC1090A is specified with total unadjusted error
Supply Current: 2.5m A Max, 1.0m A Typ
(including the effects of offset, linearity and gain errors)
, LTC and LT are registered trademarks of Linear Technology Corporation. less than ±0.5LSB. LTCMOS is a trademark of Linear Technology Corp.
The LTC1090 is specified with offset and linearity less than ±0.5LSB but with a gain error limit of ±2LSB for applications where gain is adjustable or less critical.
TYPICAL APPLICATIO
FOR 8051 CODE SEE APPLICATIONS INFORMATION SECTION
LTC1090 MPU
Linearity Plot
DIFFERENTIAL INPUT
BIPOLAR INPUT 0.5 5V
P1.1DOUT 0.0
P1.2DIN
P1.3SCLK –0.5
UNIPOLAR INPUTS P1.4CS
SERIAL DATA LINK –1.0
OUTPUT CODE
LTC1090 • TA02
– UNIPOLAR (–) INPUT
LTC1090 • TA01
–5V 1090fc
Page Summary Contents For LINEAR TECHNOLOGY LTC1090 User Guide
Manual Details
| Brand | Linear |
|---|---|
| Pages | 28 |
| File Size | 344.72 KB |
| Published | June 16, 2026 |
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Frequently Asked Questions
What is the maximum data throughput rate?
The serial I/O supports a standard full duplex serial interface up to 30kHz.
Does the unit support bipolar or unipolar measurements?
It can perform either 10-bit unipolar or 9-bit plus sign bipolar A/D conversions.
What are the available channel inputs and signal types?
There are internal differential/8 single ended inputs, and the input multiplexer supports both single ended and differential inputs.
How can the LTC1090 interface with microprocessors?
It provides a direct 4-wire interface to most MPU Serial Ports, as well as compatibility with all MPU Parallel Ports.