LTC1277 Просмотр технического описания (PDF) - Linear Technology
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LTC1277 Datasheet PDF : 20 Pages
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LTC1274/LTC1277
TYPICAL PERFORMANCE CHARACTERISTICS
Supply Current vs Temperature
3.0
fSAMPLE = 100kHz
2.5
2.0
1.5
1.0
0.5
0
–55 –25
0 25 50 75 100 125
TEMPERATURE (°C)
LT1274/77 • TPC11
Power Supply Feedthrough vs
Ripple Frequency
0
–10 fSAMPLE = 100kHz
–20
–30
–40
–50
DGND (VRIPPLE = 0.1V)
–60 VSS (VRIPPLE = 10mV)
–70
–80
–90
AVDD (VRIPPLE = 1mV)
–100
1
10
100
1000
RIPPLE FREQUENCY (kHz)
LTC1274/77 • TPC12
Reference Voltage vs
Load Current
2.435
2.430
2.425
2.420
2.415
2.410
2.405
–6 –5
–4 –3 –2 –1 0 1
LOAD CURRENT (mA)
LT1274/77 • TPC13
Supply Current vs
Supply Voltage
3.0
fSAMPLE = 100kHz
2.5
2.0
1.5
1.0
0.5
0
012
3
4
56
SUPPLY VOLTAGE (V)
LTC1274/77 • TPC14
Supply Current vs Sample Rate
With Sleep and Nap Modes
10000
CREF = 4.7µF
WITHOUT SLEEP OR NAP
1000
NAP MODE
100
10
1
0.1
NAP = REFRDY
(SLEEP MODE)
NAP = 5V
(SLEEP MODE)
1 10 100 1k 10k 100k
SAMPLE RATE (Hz)
LTC1274/77 • TPC15
Wake-Up Time vs
CREF (Sleep Mode)
10
9 TA = 25°C
8
7
6
5
4
3
2
1
0
0 5 10 15 20 25 30 35 40 45 50
CREF (µF)
LTC1274/77 • TPC16
UU U
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
(10µF tantalum in parallel with 0.1µF ceramic). VREF can be
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 1µA 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.)
7
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