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LTC1289BC Datasheet

  • LTC1289BC

  • 3 Volt Single Chip 12-Bit Data Acquisition System

  • 485.31KB

  • 28頁(yè)

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LTC1289
3 Volt Single Chip 12-Bit
Data Acquisition System
FEATURES
s
s
DESCRIPTIO
s
s
s
Single Supply 3.3V or
鹵3.3V
Operation
Software Programmable Features
Unipolar/Bipolar Conversions
4 Differential/8 Single-Ended Inputs
Variable Data Word Length
Power Shutdown
Built-In Sample and Hold
Direct 4-Wire Interface to Most MPU Serial Ports
and all MPU Parallel Ports
25kHz Maximum Throughput Rate
KEY SPECIFICATIO S
s
s
s
s
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鈥檚 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
Minimum Guaranteed Supply Voltage ............... 2.7V
Resolution ...................................................... 12 Bits
Fast Conversion Time .............. 26碌s Max Over Temp
Low Supply Currents ...................................... 1.0mA
TYPICAL APPLICATI
+3V
Single Cell 3V 12-Bit Data Acquisition System
CH0
1N4148
CH1
CH2
CH3
10碌F
鈥?V
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 (V
IN
< V
鈥?/div>
or V
IN
> V
CC
).
V
CC
ACLK
SCLK
D
IN
TO AND
FROM
MPU
+
鈥?/div>
1/4 LTC1079
22碌F
TANTALUM
10k
BOOST
V
+
OSC
LTC1044
LV
10鈩?/div>
+
CH4 LTC1289 D
OUT
CH5
CS
CH6
CH7
COM
DGND
REF
+
REF
鈥?/div>
V
鈥?/div>
AGND
1N4148
+
22碌F
LT1004-1.2
0.1碌F
1N5817
LTC1289 TA01
+
U
3V
LITHIUM
UO
U
+
10碌F
CAP
+
GND
CAP
鈥?/div>
V
OUT
鈥?V
22碌F
1

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