LTC1420IGN datasheet(6/20 Pages) LINER

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LTC1420

TYPICAL PERFOR A CE CHARACTERISTICS

IDD vs Clock Frequency

CLOCK FREQUENCY (MHz)

246

1420 G10

VREF = 4.096V

VREF = 2.048V

CLOCK FREQUENCY (MHz)

1.0

1.2

1.4

1420 G11

0.8

0.6

0.4

0.2

ISS vs Clock Frequency

CMRR vs Input Frequency

INPUT FREQUENCY (MHz)

0.01

1420 G12

0.1

+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 1

µF 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

µF ceramic.

GND (Pin 6): DAC Reference Ground.

VDD (Pin 7): Analog 5V Supply. Bypass to GND with a 1µF

to 10

µF 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 1

µF ceramic.

PIN FUNCTIONS

LTC1420 Nonaveraged 4096 Point FFT

FREQUENCY (MHz)

–120

–100

–80

–60

–40

–20

123

1420 G13

fSAMPLE = 10Msps

fIN = 5.048828125MHz

SFDR = 83.2dB

SINAD = 71dB

VIN = 4VP-P

±5V SUPPLIES

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