LTC1283 Datasheet, PDF (1/24 Pages) Linear Technology – 3V Single Chip 10-Bit Data Acquisition System

FEATURES
s _{Single Supply 3.3V or ±3.3V Operation}
s _{Software Programmable Features:}
Unipolar/Bipolar Conversions
4 Differential/8 Single-Ended Inputs
MSB- or LSB-First Data Sequence
Variable Data Word Length
s _{Built-In Sample-and-Hold}
s _{Direct 4-Wire Interface to Most MPU Serial Ports}
and all MPU Parallel Ports
s _{15kHz Maximum Throughput Rate}
KEY SPECIFICATIO S
s _{Minimum Guaranteed Supply Voltage: 3V}
s _{Resolution: 10 Bits}
s _{Offset Error: ±0.5LSB Max}
s _{Linearity Error: ±0.5LSB Max}
s _{Gain Error (LTC1283A): ±1LSB Max}
s _{Conversion Time: 44µs}
s _{Supply Current: 350µA Max, 150µA Typ}
TYPICAL APPLICATI
4.7µF
3V
FOR 83CL410 CODE SEE
APPLICATIONS INFORMATION SECTION
LTC1283
DIFFERENTIAL
INPUT
MPU
(e.g., 83CL410)
3V
–3V
3V
T
BIPOLAR
INPUT
D_OUT
P1.1
D_IN
P1.2
SCLK
P1.3
UNIPOLAR
INPUTS
CS
P1.4
SERIAL DATA LINK
(+)
(–)
–UNIPOLAR
INPUT
–3V
LTC1283 • TA01
LTC1283
3V Single Chip 10-Bit Data
Acquisition System
DESCRIPTIO
The LTC1283 is a 3V data acquisition component which
contains a serial I/O successive approximation A/D con-
verter. It uses LTCMOS^TM switched capacitor technology
to perform either 10-bit unipolar, or 9-bit plus sign bipolar
A/D conversions. The 8-channel input multiplexer can be
configured for either single-ended or differential inputs (or
combinations thereof). An on-chip sample-and-hold is
included for all single-ended input channels.
The serial I/O is designed to be compatible with industry-
standard full-duplex serial interfaces. It allows either MSB-
or LSB-first data and automatically provides 2’s comple-
ment output coding in the bipolar mode. The output data
word can be programmed for a length of 8-, 10-, 12-, or
16-bit. This allows easy interface to shift registers and a
variety of processors.
Both the LTC1283A and LTC1283 are specified with offset
and linearity errors less than ±0.5LSB. The LTC1283A has
a gain error limit of ±1LSB. The 1283 is specified with a
gain error limit of ±2LSB for applications where gain is
adjustable or less critcial.
LTCMOS is a trademark of Linear Technology Corp.
1.0
0.5
0
–0.5
– 1.0
0
Linearity Plot
512
OUTPUT CODE
1024
LTC1283 • TA02
1