LTC2430CGN datasheet(9/40 Pages) LINER

Part #	LTC2430CGN

Description	20-Bit No Latency Delta-Sigma ADCs with Differential Input and Differential Reference

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Manufacturer	LINER [Linear Technology]

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LTC2430/LTC2431

9

24301f

VCC (Pin 1): Positive Supply Voltage. Bypass to GND

(Pin 6) with a 10

µF tantalum capacitor in parallel with

0.1

µF ceramic capacitor as close to the part as possible.

REF+ (Pin 2), REF– (Pin 3): Differential Reference Input.

The voltage on these pins can have any value between GND

and VCC as long as the reference positive input, REF+, is

maintained more positive than the reference negative

input, REF –, by at least 0.1V.

IN+ (Pin 4), IN– (Pin 5): Differential Analog Input. The

voltage on these pins can have any value between

GND – 0.3V and VCC + 0.3V. Within these limits, the

converter bipolar input range (VIN = IN+ – IN–) extends

from – 0.5 • (VREF) to 0.5 • (VREF). Outside this input

range, the converter produces unique overrange and

underrange output codes.

GND (Pin 6): Ground. Connect this pin to a ground plane

through a low impedance connection.

CS (Pin 7): Active LOW Digital Input. A LOW on this pin

enables the SDO digital output and wakes up the ADC.

Following each conversion, the ADC automatically enters

the Sleep mode and remains in this low power state as

long as CS is HIGH. A LOW-to-HIGH transition on CS

during the Data Output transfer aborts the data transfer

and starts a new conversion.

PI FU CTIO S

GND (Pins 1, 7, 8, 9, 10, 15, 16): Ground. Multiple ground

pins internally connected for optimum ground current flow

and VCC decoupling. Connect each one of these pins to a

ground plane through a low impedance connection. All seven

pins must be connected to ground for proper operation.

VCC (Pin 2): Positive Supply Voltage. Bypass to GND with

a 10

µF tantalum capacitor in parallel with 0.1µF ceramic

capacitor as close to the part as possible.

REF+ (Pin 3), REF– (Pin 4): Differential Reference Input.

The voltage on these pins can have any value between GND

and VCC as long as the reference positive input, REF+, is

maintained more positive than the reference negative

input, REF –, by at least 0.1V.

IN+ (Pin 5), IN– (Pin 6): Differential Analog Input. The

voltage on these pins can have any value between

GND – 0.3V and VCC + 0.3V. Within these limits the

converter bipolar input range (VIN = IN+ – IN–) extends

from – 0.5 • (VREF) to 0.5 • (VREF). Outside this input range

the converter produces unique overrange and underrange

output codes.

CS (Pin 11): Active LOW Digital Input. A LOW on this pin

enables the SDO digital output and wakes up the ADC.

Following each conversion the ADC automatically enters

the Sleep mode and remains in this low power state as

long as CS is HIGH. A LOW-to-HIGH transition on CS

during the Data Output transfer aborts the data transfer

and starts a new conversion.

SDO (Pin 12): Three-State Digital Output. During the Data

Output period, this pin is used as serial data output. When

the chip select CS is HIGH (CS = VCC) the SDO pin is in a

high impedance state. During the Conversion and Sleep

periods, this pin is used as the conversion status output.

The conversion status can be observed by pulling CS LOW.

SCK (Pin 13): Bidirectional Digital Clock Pin. In Internal

Serial Clock Operation mode, SCK is used as digital output

for the internal serial interface clock during the Data

Output period. In External Serial Clock Operation mode,

SCK is used as digital input for the external serial interface

clock during the Data Output period. A weak internal pull-

up is automatically activated in Internal Serial Clock Op-

eration mode. The Serial Clock Operation mode is deter-

mined by the logic level applied to the SCK pin at power up

or during the most recent falling edge of CS.

FO (Pin 14): Frequency Control Pin. Digital input that

controls the ADC’s notch frequencies and conversion

time. When the FO pin is connected to VCC (FO = VCC), the

converter uses its internal oscillator and the digital filter

first null is located at 50Hz. When the FO pin is connected

to GND (FO = OV), the converter uses its internal oscillator

and the digital filter first null is located at 60Hz. When FO

is driven by an external clock signal with a frequency fEOSC,

the converter uses this signal as its system clock and the

digital filter first null is located at a frequency fEOSC/2560.

(LTC2430)

(LTC2431)

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