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LTC1272-8CCN Datasheet(PDF) 1 Page - Linear Technology

Part # LTC1272-8CCN
Description  12-Bit, 3us, 250kHz Sampling A/D Converter
Download  20 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC1272-8CCN Datasheet(HTML) 1 Page - Linear Technology

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1
LTC1272
12-Bit, 3
µs, 250kHz
Sampling A/D Converter
DESCRIPTIO
s
AD7572 Pinout
s
12-Bit Resolution
s
3
µs and 8µs Conversion Times
s
On-Chip Sample-and-Hold
s
Up to 250kHz Sample Rates
s
5V Single Supply Operation
s
No Negative Supply Required
s
On-Chip 25ppm/
°C Reference
s
75mW (Typ) Power Consumption
s
24-Pin Narrow DIP and SOL Packages
s
ESD Protected on All Pins
S
FEATURE
s
High Speed Data Acquisition
s
Digital Signal Processing (DSP)
s
Multiplexed Data Acquisition Systems
s
Single Supply Systems
S
APPLICATI
The LTC1272 is a 3
µs, 12-bit, successive approximation
sampling A/D converter. It has the same pinout as the
industry standard AD7572 and offers faster conversion
time, on-chip sample-and-hold, and single supply opera-
tion. It uses LTBiCMOS
TM switched-capacitor technology to
combine a high speed 12-bit ADC with a fast, accurate
sample-and-hold and a precision reference.
The LTC1272 operates with a single 5V supply but can also
accept the 5V/–15V supplies required by the AD7572 (Pin
23, the negative supply pin of the AD7572, is not connected
on the LTC1272). The LTC1272 has the same 0V to 5V input
range as the AD7572 but, to achieve single supply opera-
tion, it provides a 2.42V reference output instead of the
– 5.25V of the AD7572. It plugs in for the AD7572 if the
reference capacitor polarity is reversed and a 1
µs sample-
and-hold acquisition time is allowed between conversions.
The output data can be read as a 12-bit word or as two
8-bit bytes. This allows easy interface to both 8-bit and
higher processors. The LTC1272 can be used with a
crystal or an external clock and comes in speed grades of
3
µs and 8µs.
FREQUENCY (kHz)
0
–140
20
40
60
80
LTC1272 • TA02
–120
–100
–80
–60
–40
–20
0
100
120
S
(N+D)
= 72.1
Single 5V Supply, 3
µs, 12-Bit Sampling ADC
10 F
µ
IN
REF
D11 (MSB)
D10
D9
D8
D7
CLK IN
CLK OUT
HBEN
RD
CS
BUSY
NC
V
LTC1272
D6
D5
D4
DGND
D3/11
D2/10
D1/9
D0/8
A
V
AGND
DD
P
CONTROL
LINES
µ
µ
0.1 F
5V
8 OR 12-BIT
PARALLEL
BUS
ANALOG INPUT
(0V TO 5V)
10
µF
0.1
µF
LTC1272 • TA01
+
+
2.42V
V
OUTPUT
REF
APPLICATI
TYPICAL
LTBiCMOS is a trademark of Linear Technology Corporation
1024 Point FFT, fS = 250kHz, fIN = 10kHz


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