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LTC1289 Datasheet(PDF) 1 Page - Linear Technology

Part No. LTC1289
Description  3 Volt Single Chip 12-Bit Data Acquisition System
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Maker  LINER [Linear Technology]
Homepage  http://www.linear.com
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1
LTC1289
3 Volt Single Chip 12-Bit
Data Acquisition System
S
FEATURE
DESCRIPTIO
s
Single Supply 3.3V or
±3.3V Operation
s
Software Programmable Features
Unipolar/Bipolar Conversions
4 Differential/8 Single-Ended Inputs
Variable Data Word Length
Power Shutdown
s
Built-In Sample and Hold
s
Direct 4-Wire Interface to Most MPU Serial Ports
and all MPU Parallel Ports
s
25kHz Maximum Throughput Rate
APPLICATI
TYPICAL
Single Cell 3V 12-Bit Data Acquisition System
KEY SPECIFICATIO S
s
Minimum Guaranteed Supply Voltage ............... 2.7V
s
Resolution ...................................................... 12 Bits
s
Fast Conversion Time .............. 26
µs Max Over Temp
s
Low Supply Currents ...................................... 1.0mA
The LTC1289 is a 3V data acquisition component which
contains a serial I/O successive approximation A/D con-
verter. The device specifications are guaranteed at a
supply voltage of 2.7V. It uses LTCMOS
TM switched ca-
pacitor technology to perform a 12-bit unipolar, or 11-bit
plus sign bipolar A/D conversion. 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. When the LTC1289 is idle it can be powered
down in applications where low power consumption is
desired.
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, 12 or 16 bits.
This allows easy interface to shift registers and a variety of
processors.
LTCMOS
TM is a trademark of Linear Technology Corporation
LTC1289 TA01
LTC1289
1N4148
10
µF
+
10
1/4 LTC1079
+3V
–3V
TO AND
FROM
MPU
+
22
µF
TANTALUM
1N4148
10k
+
LT1004-1.2
0.1
µF
22
µF
1N5817
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7
COM
DGND
VCC
ACLK
SCLK
DIN
DOUT
CS
REF+
REF
V
AGND
BOOST
CAP+
GND
CAP
V+
OSC
LV
VOUT
LTC1044
10
µF
+
22
µF
–3V
3V
LITHIUM
FOR OVERVOLTAGE PROTECTION ON
ONLY ONE CHANNEL LIMIT THE INPUT
CURRENT TO 15mA. FOR MORE THAN
ONE CHANNEL LIMIT THE INPUT
CURRENT TO 7mA PER CHANNEL AND
28mA FOR ALL CHANNELS.
CONVERSION RESULTS ARE NOT VALID
WHEN THE SELECTED OR ANY OTHER
CHANNEL IS OVERVOLTAGED (VIN < V
or VIN > VCC).




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