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LTC1603IG

High Speed, 16-Bit, 250ksps Sampling A/D Converter with Shutdown

Linear Technology 

LTC1603

PIN FUNCTIONS

AIN+ (Pin 1): Positive Analog Input. The ADC converts the

difference voltage between AIN+ and AIN– with a differen-

tial range of ±2.5V. AIN+ has a ±2.5V input range when

AIN– is grounded.

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

to a DC voltage or driven differentially with AIN+.

VREF (Pin 3): 2.5V Reference Output. Bypass to AGND with

2.2µF tantalum in parallel with 0.1µF ceramic.

REFCOMP (Pin 4): 4.375V Reference Compensation Pin.

Bypass to AGND with 47µF tantalum in parallel with 0.1µF

ceramic.

AGND (Pins 5 to 8): Analog Grounds. Tie to analog ground

plane.

DVDD (Pin 9): 5V Digital Power Supply. Bypass to DGND

with 10µF tantalum in parallel with 0.1µF ceramic.

DGND (Pin 10): Digital Ground for Internal Logic. Tie to

analog ground plane.

D15 to D0 (Pins 11 to 26): Three-State Data Outputs. D15

is the Most Significant Bit.

BUSY (Pin 27): The BUSY output shows the converter

status. It is low when a conversion is in progress. Data is

valid on the rising edge of BUSY.

OGND (Pin 28): Digital Ground for Output Drivers.

OVDD (Pin 29): Digital Power Supply for Output Drivers.

Bypass to OGND with 10µF tantalum in parallel with 0.1µF

ceramic.

RD (Pin 30): Read Input. A logic low enables the output

drivers when CS is low.

CONVST (Pin 31): Conversion Start Signal. This active

low signal starts a conversion on its falling edge when CS

is low.

CS (Pin 32): The Chip Select Input. Must be low for the

ADC to recognize CONVST and RD inputs.

SHDN (Pin 33): Power Shutdown. Drive this pin low with

CS low for nap mode. Drive this pin low with CS high for

sleep mode.

VSS (Pin 34): – 5V Negative Supply. Bypass to AGND with

10µF tantalum in parallel with 0.1µF ceramic.

AVDD (Pin 35): 5V Analog Power Supply. Bypass to AGND

with 10µF tantalum in parallel with 0.1µF ceramic.

AVDD (Pin 36): 5V Analog Power Supply. Bypass to AGND

with 10µF tantalum in parallel with 0.1µF ceramic and

connect this pin to Pin 35 with a 10Ω resistor.

1603f

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