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LTC1274CSW Datasheet(PDF) 7 Page - Linear Integrated Systems

Part # LTC1274CSW
Description  12-Bit, 10mW, 100ksps ADCs with 1A Shutdown
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Manufacturer  LINEAR [Linear Integrated Systems]
Direct Link  http://www.linearsystems.com
Logo LINEAR - Linear Integrated Systems

LTC1274CSW Datasheet(HTML) 7 Page - Linear Integrated Systems

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7
LTC1274/LTC1277
TYPICAL PERFORMANCE CHARACTERISTICS
Reference Voltage vs
Load Current
LOAD CURRENT (mA)
–6
2.435
2.430
2.425
2.420
2.415
2.410
2.405
–3
–1
LT1274/77 • TPC13
–5
–4
–2
0
1
Supply Current vs Temperature
TEMPERATURE (
°C)
–55
3.0
2.5
2.0
1.5
1.0
0.5
0
25
75
LT1274/77 • TPC11
–25
0
50
100
125
fSAMPLE = 100kHz
Power Supply Feedthrough vs
Ripple Frequency
RIPPLE FREQUENCY (kHz)
1
10
100
1000
LTC1274/77 • TPC12
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
fSAMPLE = 100kHz
AVDD (VRIPPLE = 1mV)
VSS (VRIPPLE = 10mV)
DGND (VRIPPLE = 0.1V)
Supply Current vs Sample Rate
With Sleep and Nap Modes
SAMPLE RATE (Hz)
10000
1000
100
10
1
0.1
1k
100k
LTC1274/77 • TPC15
10
1
10k
100
WITHOUT SLEEP OR NAP
NAP = 5V
(SLEEP MODE)
NAP = REFRDY
(SLEEP MODE)
NAP MODE
CREF = 4.7µF
Wake-Up Time vs
CREF (Sleep Mode)
Supply Current vs
Supply Voltage
CREF (µF)
0
10
9
8
7
6
5
4
3
2
1
0
40
LTC1274/77 • TPC16
10
515
25
35
45
20
30
50
TA = 25°C
SUPPLY VOLTAGE (V)
0
3.0
2.5
2.0
1.5
1.0
0.5
0
1
23
4
LTC1274/77 • TPC14
56
fSAMPLE = 100kHz
PI FU CTIO S
LTC1274
AIN (Pin 1): Analog Input. 0V to 4.096V, unipolar (VSS =
0V) or
±2.048V, bipolar (VSS = –5V).
VREF (Pin 2): 2.42V Reference Output. Bypass to AGND
(10
µFtantaluminparallelwith0.1µFceramic).VREFcanbe
overdriven positive with an external reference voltage.
AGND (Pin 3): Analog Ground.
D11 to D4 (Pins 4 to 11): Three-State Data Outputs. D11
is the Most Significant Bit.
DGND (Pin 12): Digital Ground.
D3 to D0 (Pins 13 to 16): Three-State Data Outputs.
REFRDY (Pin 17): Reference Ready Signal. It goes high
when the reference has settled after SLEEP indicating that
the ADC is ready to sample.
SLEEP (Pin 18): SLEEP Mode Input. Tie this pin to low to
put the ADC in Sleep mode and save power (REFRDY will
go low). The device will draw 1
µA in this mode.
CONVST (Pin 19): Conversion Start Signal. This active low
signal starts a conversion on its falling edge (to recognize
CONVST, CS has to be low.)


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