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LTC1277IS Datasheet

  • LTC1277IS

  • 12-Bit, 10mW, 100ksps ADCs with 1uA Shutdown

  • 20頁(yè)

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LTC1274/LTC1277
12-Bit, 10mW, 100ksps
ADCs with 1碌A(chǔ) Shutdown
FEATURES
s
s
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DESCRIPTIO
s
s
s
s
s
s
s
Low Power Dissipation: 10mW
Sample Rate: 100ksps
Samples Inputs Beyond Nyquist, 72dB S/(N + D)
and 82dB THD at f
IN
= 100kHz
Single Supply 5V or
鹵5V
Operation
Power Shutdown to 1碌A(chǔ) in Sleep Mode
180碌A(chǔ) Nap Mode (LTC1277) with Instant Wake-Up
Internal Reference Can Be Overdriven
Internal Synchronized Clock
0V to 4.096V or
鹵2.048V
Input Ranges (1mV/LSB)
24-Lead SO Package
The LTC
廬
1274/LTC1277 are 8碌s sampling 12-bit A/D
converters which draw only 2mA (typ) from single 5V or
鹵5V
supplies. These easy-to-use devices come complete
with a 2碌s sample-and-hold, a precision reference and an
internally trimmed clock. Unipolar and bipolar conversion
modes add to the flexibility of the ADCs.
Two power-down modes are available in the LTC1277. In
Nap mode, the LTC1277 draws only 180碌A(chǔ) and the instant
wake-up from Nap mode allows the LTC1277 to be pow-
ered down even during brief inactive periods. In Sleep
mode only 1碌A(chǔ) will be drawn. A REFRDY signal is used to
show the ADC is ready to sample after waking up from
Sleep mode. The LTC1274 also provides the Sleep mode
and REFRDY signal.
The A/D converters convert 0V to 4.096V unipolar inputs
from a single 5V supply or
鹵2.048V
bipolar inputs from
鹵5V
supplies.
The LTC1274 has a single-ended input and a 12-bit
parallel data format. The LTC1277 offers a differential
input and a 2-byte read format. The bipolar mode is
formatted as 2鈥檚 complement for the LTC1274 and offset
binary for the LTC1277.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATI
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Battery-Powered Portable Systems
High Speed Data Acquisition for PCs
Digital Signal Processing
Multiplexed Data Acquisition Systems
Audio and Telecom Processing
Spectrum Analysis
TYPICAL APPLICATI
Single 5V Supply, 10mW, 100kHz, 12-Bit ADC
LTC1277
1
ANALOG
V
DD
A
IN+
DIFFERENTIAL INPUTS 2
鈥?/div>
A
IN
V
SS
(0V TO 4.096V)
3
2.42V
V
REF
BUSY
V
REF
OUTPUT
+
4
CS
AGND
0.1碌F
10碌F
5
RD
REFRDY
6
CONVST
SLEEP
7
HBEN
NAP
8
V
LOGIC
D7
9
D6
D0/8
10
D5
D1/9
8-BIT
11
D4
D2/10
PARALLEL
12
BUS
DGND
D3/11
5V
24
23
22
21
20
19
18
17
16
15
14
13
OPTIONAL 3V SUPPLY
TO INTERFACE WITH 3V
PROCESSOR
10碌F
碌P
CONTROL
LINES
10000
C
REF
= 4.7碌F
0.1碌F
+
SUPPLY CURRENT (碌A(chǔ))
1000
100
NAP = REFRDY
(SLEEP MODE)
10
NAP = 5V
(SLEEP MODE)
1
0.1
LTC1274/77 鈥?TA01
U
Supply Current vs Sample Rate with
Sleep and Nap Modes
WITHOUT SLEEP OR NAP
NAP MODE
1
10
100
1k
10k
100k
SAMPLE RATE (Hz)
LTC1274/77 鈥?TA02
UO
UO
1

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