Datasheet LTC2450 (Analog Devices) - 6

LTC2450
PIN FUNCTIONS VCC (Pin 1):
Positive Supply Voltage and Converter Refer-
SDO (Pin 5):
Three-State Serial Data Output. SDO is used ence Voltage. Bypass to GND (Pin 3) with a 10μF capacitor for serial data output during the DATA OUTPUT state and in parallel with a low series inductance 0.1μF capacitor can be used to monitor the conversion status. located as close to the part as possible.
SCK (Pin 6):
Serial Clock Input. SCK synchronizes the serial
VIN (Pin 2):
Analog Input Voltage. data output. While digital data is available (the ADC is not in CONVERT state) and CS is LOW (ADC is not in SLEEP
GND (Pin 3):
Ground. Connect to a ground plane through state) a new data bit is produced at the SDO output pin a low impedance connection. following every falling edge applied to the SCK pin.
CS (Pin 4):
Chip Select Active LOW Digital Input. A LOW on
Exposed Pad (Pin 7):
Ground. The Exposed Pad must be this pin enables the SDO digital output. A HIGH on this pin soldered to the same point as Pin 3. places the SDO output pin in a high impedance state.
FUNCTIONAL BLOCK DIAGRAM
VCC V CS CC REF + SPI SDO INTERFACE 16 BIT ΔΣ SCK V A/D IN CONVERTER INTERNAL REF – OSCILLATOR GND 2450 BD
Figure 1. Functional Block Diagram
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