LTC2450-1

6

24501fb

PIN FUNCTIONS

ence Voltage. Bypass to GND (Pin 3) with a 10μF capacitor

in parallel with a low series inductance 0.1μF capacitor

located as close to the part as possible.

GND (Pin 3): Ground. Connect to a ground plane through

a low impedance connection.

CS (Pin 4): Chip Select (Active LOW) Digital Input. A

LOW on this pin enables the SDO digital output. A HIGH

on this pin places the SDO output pin in a high imped-

ance state.

SDO (Pin 5): Three-State Serial Data Output. SDO is used

for serial data output during the DATA OUTPUT state and

can be used to monitor the conversion status.

SCK (Pin 6): Serial Clock Input. SCK synchronizes the serial

data output. While digital data is available (the ADC is not

in CONVERT state) and CS is LOW (ADC is not in SLEEP

state) a new data bit is produced at the SDO output pin

following every falling edge applied to the SCK pin.

Exposed Pad (Pin 7): Ground. The Exposed Pad must be

soldered to the same point as Pin 3.

Figure 1. Functional Block Diagram

SPI

INTERFACE

16 BIT ΔΣ

A/D

CONVERTER

INTERNAL

OSCILLATOR

REF +

CS

SDO

SCK

GND

REF –

24501 BD

FUNCTIONAL BLOCK DIAGRAM