LTC2436-1IGN datasheet(6/28 Pages) LINER

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LTC2436-1

24361f

VCC (Pin 1): 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 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.

CH0+ (Pin 4): Positive Input for Differential Channel 0.

CH0– (Pin 5): Negative Input for Differential Channel 0.

CH1+ (Pin 6): Positive Input for Differential Channel 1.

CH1– (Pin 7): Negative Input for Differential Channel 1.

The voltage on these four analog inputs (Pins 4 to 7) can

have any value between GND and VCC. 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 (Pins 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

planethroughalowimpedanceconnection.Allfive pinsmust

be connected to ground for proper operation.

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 GND (FO = 0V), the

converter uses its internal oscillator and rejects 50Hz and

60Hz simultaneously. 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 has 87dB

minimum rejection in the range fEOSC/2560 ±14% and

110dB minimum rejection at fEOSC/2560 ±4%.

PI FU CTIO S

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