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LTC1291BI

Description
2-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDIP8
Categorysemiconductor    logic   
File Size302KB,20 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Download Datasheet Parametric View All

LTC1291BI Overview

2-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDIP8

LTC1291BI Parametric

Parameter NameAttribute value
Number of functions1
Number of terminals8
Maximum operating temperature70 Cel
Minimum operating temperature0.0 Cel
Rated supply voltage5 V
Maximum conversion time12 uS
Maximum linear error0.0122 %
Maximum limit analog input voltage5.05 V
Minimum limit analog input voltage-0.0500 V
Processing package description0.300 INCH, PLASTIC, DIP-8
stateACTIVE
CraftsmanshipCMOS
packaging shapeRECTANGULAR
Package SizeIN-LINE
Terminal formTHROUGH-HOLE
Terminal spacing2.54 mm
terminal coatingTIN LEAD
Terminal locationDUAL
Packaging MaterialsPLASTIC/EPOXY
Temperature levelCOMMERCIAL
Output formatSERIAL
Type of converterSUCCESSIVE APPROXIMATION
Number of digits12
Output bit encodingBINARY
Number of analog channels2
Sample and hold and track and holdSAMPLE
LTC1291
Single Chip 12-Bit
Data Acquisition System
FEATURES
s
s
s
s
DESCRIPTIO
s
s
s
Built-In Sample-and-Hold
Single Supply 5V Operation
Power Shutdown
Direct 3- or 4-Wire Interface to Most MPU Serial
Ports and All MPU Parallel Ports
Two-Channel Analog Multiplexer
Analog Inputs Common Mode to Supply Rails
8-Pin DIP Package
KEY SPECIFICATIO S
s
s
s
The LTC1291 is a data acquisition system that contains a
serial I/O successive approximation A/D converter. It uses
LTCMOS
TM
switched capacitor technology to perform a
12-bit unipolar A/D conversion. The input multiplexer can
be configured for either single-ended or differential in-
puts. An on-chip sample-and-hold is included on the “+”
input. When the LTC1291 is idle, it can be powered down
in applications where low power consumption is desired.
An external reference is not required because the LTC1291
takes its reference from the power supply (V
CC
). All these
features are packaged in an 8-pin DIP.
The serial I/O is designed to communicate without external
hardware to most MPU serial ports and all MPU parallel
I/O ports allowing data to be transmitted over three or four
wires. Given the accuracy, ease of use and small package
size, this device is well suited for digitizing analog signals
in remote applications where minimum number of inter-
connects, small physical size, and low power consump-
tion are important.
LTCMOS
TM
is a trademark of Linear Technology Corporation
Resolution: 12 Bits
Fast Conversion Time: 12µs Max Over Temp.
Low Supply Current:
6.0mA (Typ) Active Mode
10µA (Max) Shutdown Mode
TYPICAL APPLICATI
2-Channel 12-Bit Data Acquisition System
22µF
TANTALUM
+5V
0.5
0.4
0.3
CS
CH0
2-CHANNEL
MUX*
CH1
GND
DELTA (LSB)
V
CC
(V
REF
)
0.1µF
CLK
LTC1291
D
OUT
D
IN
DO
SCK
MC68HC11
MISO
MOSI
1291 TA01
*FOR OVERVOLTAGE PROTECTION LIMIT THE INPUT CURRENT TO 15mA
PER PIN OR CLAMP THE INPUTS TO V
CC
AND GND WITH 1N4148 DIODES.
CONVERSION RESULTS ARE NOT VALID WHEN THE SELECTED CHANNEL OR
THE OTHER CHANNEL IS OVERVOLTAGED (V
IN
< GND OR V
IN
> V
CC
). SEE
SECTION ON OVERVOLTAGE PROTECTION IN THE APPLICATIONS INFORMATION.
U
Channel-to-Channel
INL Matching
0.2
0.1
0
–0.1
–0.2
–0.3
–0.4
–0.5
0
512 1024 1536 2048 2560 3072 3584 4096
CODE
1291 TA02
UO
U
+
1
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