LTC1420 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
LTC1420 Datasheet PDF : 20 Pages
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LTC1420
TYPICAL PERFOR A CE CHARACTERISTICS
IDD vs Clock Frequency
52
50
48
VREF = 4.096V
46
44
VREF = 2.048V
42
40
0
2
4
6
8
10
CLOCK FREQUENCY (MHz)
1420 G10
CMRR vs Input Frequency
90
80
70
60
50
40
30
20
10
0
0.01
0.1
1
INPUT FREQUENCY (MHz)
10
1420 G12
ISS vs Clock Frequency
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
0
2
4
6
8
10
CLOCK FREQUENCY (MHz)
1420 G11
LTC1420 Nonaveraged 4096 Point FFT
0
fSAMPLE = 10Msps
fIN = 5.048828125MHz
–20 SFDR = 83.2dB
SINAD = 71dB
–40
VIN = 4VP-P
±5V SUPPLIES
–60
–80
–100
–120
0
1
2
3
4
5
FREQUENCY (MHz)
1420 G13
PIN FUNCTIONS
+ AIN (Pin 1): Positive Analog Input.
– AIN (Pin 2): Negative Analog Input.
VCM (Pin 3): 2.5V Reference Output.Optional input com-
mon mode for single supply operation. Bypass to GND
with a 1µF to 10µF ceramic.
SENSE (Pin 4): Reference Programming Pin. Ground
selects VREF = 4.096V. Short to VREF for 2.048V. Connect
SENSE to VDD to drive VREF with an external reference.
VREF (Pin 5): DAC Reference. Bypass to GND with a 1µF to
10µF ceramic.
GND (Pin 6): DAC Reference Ground.
VDD (Pin 7): Analog 5V Supply. Bypass to GND with a 1µF
to 10µF ceramic.
GND (Pin 8): Analog Power Ground.
D11 to D0 (Pins 9 to 20): Data Outputs. The output format
is two’s complement.
OGND (Pin 21): Output Logic Ground. Tie to GND.
OVDD (Pin 22): Positive Supply for the Output Logic.
Connect to Pin 23 for 5V logic. If not shorted to Pin 23,
bypass to GND with a 1µF ceramic.
6
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