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LTC1290CM Datasheet

  • LTC1290CM

  • Linear Technology [Single Chip 12-Bit Data Acquisition Syst...

  • LINER

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LTC1290
Single Chip 12-Bit Data
Acquisition System
FEATURES
s
DESCRIPTIO
s
s
s
s
Software Programmable Features
鈥?Unipolar/Bipolar Conversion
鈥?Four Differential/Eight Single-Ended Inputs
鈥?MSB- or LSB-First Data Sequence
鈥?Variable Data Word Length
鈥?Power Shutdown
Built-In Sample-and-Hold
Single Supply 5V or
鹵5V
Operation
Direct Four-Wire Interface to Most MPU Serial Ports
and All MPU Parallel Ports
50kHz Maximum Throughput Rate
The LTC
廬
1290 is a 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 12-bit unipolar or 11-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. When the
LTC1290 is idle it can be powered down with a serial word
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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
LTCMOS is a trademark of Linear Technology Corporation.
KEY SPECIFICATIO S
s
s
s
Resolution: 12 Bits
Fast Conversion Time: 13碌s Max Over Temp
Low Supply Current: 6.0mA
TYPICAL APPLICATI
SINGLE-ENDED INPUT
0V TO 5V OR
鹵5V
鹵15V
OVERVOLTAGE RANGE*
12-Bit 8-Channel Sampling Data Acquisition System
1k
CH0
CH1
CH2
CH3
DIFFERENTIAL INPUT (+)
鹵5V
COMMON MODE RANGE (鈥?
CH4
CH5
LTC1290
V
CC
ACLK
SCLK
D
IN
D
OUT
CS
REF
+
REF
鈥?/div>
V
鈥?/div>
AGND
0.1碌F
1290 鈥?TA01
鈥?/div>
鈥?/div>
鈥?/div>
+
22碌F
TANTALUM
1N5817
TO AND FROM
MICROPROCESSOR
鈥?/div>
鈥?/div>
鈥?/div>
CH6
CH7
COM
DGND
+
4.7碌F
TANTALUM
鈥?V
1N5817
* FOR OVERVOLTAGE PROTECTION ON ONLY ONE CHANNEL LIMIT THE INPUT CURRENT TO 15mA. FOR OVERVOLTAGE PROTECTION
ON MORE THAN ONE CHANNEL LIMIT THE INPUT CURRENT TO 7mA PER CHANNEL AND 28mA FOR ALL CHANNELS. (SEE SECTION ON
OVERVOLTAGE PROTECTION IN THE APPLICATIONS INFORMATION SECTION.) CONVERSION RESULTS ARE NOT VALID WHEN THE SELECTED
OR ANY OTHER CHANNEL IS OVERVOLTAGED (V
IN
< V
鈥?/div>
OR V
IN
> V
CC
).
U
5V
1N4148
LT
廬
1027
8V TO 40V
1碌F
UO
U
1

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