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LTC1412

TYPICAL PERFOR A CE CHARACTERISTICS

RIPPLE FREQUENCY (Hz)

–80

–40

–100

–60

–20

10k

100k

10M

1412 G08

–120

VSS

VDD

DGND

Power Supply Feedthrough

vs Ripple Frequency

INPUT FREQUENCY (Hz)

100k

10M

1412 G09

10k

Input Common Mode Rejection

vs Input Frequency

PIN FUNCTIONS

AIN+ (Pin 1): Positive Analog Input. ±2.5V input range

when AIN– is grounded. ±2.5V differential if AIN– is

driven.

AIN– (Pin 2): Negative Analog Input. Can be grounded or

driven differentially with AIN+.

VREF (Pin 3): 2.5V Reference Output.

REFCOMP (Pin 4): 4.06V Reference Bypass Pin.

Bypass to AGND with 10

µF ceramic (or 10µF tantalum in

parallel with 0.1

µF ceramic).

AGND (Pin 5): Analog Ground.

D11 to D4 (Pins 6 to 13): Three-State Data Outputs.

DGND (Pin 14): Digital Ground for Internal Logic.

D3 to D0 (Pins 15 to 18): Three-State Data Outputs.

OGND (Pin 19): Digital Ground for the Output Drivers.

OVDD (Pin 20): Positive Supply for the Output Drivers. Tie

to Pin 28 when driving 5V logic. Tie to 3V when driving

3V logic.

DVDD (Pin 21): 5V Positive Supply. Tie to Pin 28. Bypass

to AGND with 0.1

µF ceramic.

DGND (Pin 22): Digital Ground for Internal Logic.

CONVST (Pin 23): Conversion Start Signal. This active low

signal starts a conversion on its falling edge.

CS (Pin 24): Chip Select. This input must be low for the

ADC to recognize the CONVST inputs.

BUSY (Pin 25): The BUSY Output Shows the Converter

Status. It is low when a conversion is in progress.

VSS (Pin 26): – 5V Negative Supply. Bypass to AGND with

µF ceramic (or 10µF tantalum in parallel with 0.1µF

ceramic).

DVDD (Pin 27): 5V Positive Supply. Tie to Pin 28.

AVDD (Pin 28): 5V Positive Supply. Bypass to AGND with

µF ceramic (or 10µF tantalum in parallel with 0.1µF

ceramic).

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