CS5509-ASZR【PDF 11/24 页】IC ADC 16BIT SGL SUPP 16-SOIC

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Sheet目录1991

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CS5509

DS125F3

PIN DESCRIPTIONS*

* Pinout applies to both PDIP and SOIC

Clock Generator

XIN; XOUT - Crystal In; Crystal Out, Pins 4, 5.

A gate inside the chip is connected to these pins and can be used with a crystal to provide the

master clock for the device. Alternatively, an external (CMOS compatible) clock can be

supplied into the XIN pin to provide the master clock for the device. Loss of clock will put the

device into a lower powered state (approximately 70% power reduction).

Serial Output I/O

CS - Chip Select, Pin 1.

This input allows an external device to access the serial port.

DRDY - Data Ready, Pin 16.

Data Ready goes low at the end of a digital filter convolution cycle to indicate that a new

output word has been placed into the serial port. DRDY will return high after all data bits are

shifted out of the serial port or two master clock cycles before new data becomes available if

the CS pin is inactive (high).

SDATA - Serial Data Output, Pin 15.

SDATA is the output pin of the serial output port. Data from this pin will be output at a rate

determined by SCLK. Data is output MSB first and advances to the next data bit on the falling

edges of SCLK. SDATA will be in a high impedance state when not transmitting data.

SCLK - Serial Clock Input, Pin 14.

A clock signal on this pin determines the output rate of the data from the SDATA pin. This pin

must not be allowed to float.

DRDY

SDATA

SCLK

VD+

GND

VA+

VREF-

VREF+

AIN-

AIN+

BP/UP

XOUT

XIN

CAL

CONV

DIFFERENTIAL ANALOG INPUT

BIPOLAR / UNIPOLAR

CRYSTAL OUT

CRYSTAL IN

CALIBRATE

CONVERT

CHIP SELECT

DATA READY

SERIAL DATA OUTPUT

SERIAL CLOCK INPUT

POSITIVE DIGITAL POWER

GROUND

POSITIVE ANALOG POWER

VOLTAGE REFERENCE INPUT

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