LTC1857 查看數據表（PDF） - Linear Technology

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LTC1857

8-Channel, 12-/14-/16-Bit, 100ksps SoftSpan A/D Converters with Shutdown

Linear Technology 

LTC1857/LTC1858/LTC1859

PIN FUNCTIONS

DGND (Pin 24): Digital Ground.

SDI (Pin 25): Serial Data Input. SDI will ignore clocked

data while RD is high.

SCK (Pin 26): Serial Data Clock.

RD (Pin 27): Read Input. This active low signal enables

the digital output pin SDO.

CONVST (Pin 28): Conversion Start. This active high signal

starts a conversion on its rising edge.

FUNCTIONAL BLOCK DIAGRAM

AVDD DVDD

CH0

CH1

•

INPUT MUX

•

AND

RANGE

•

SELECT

CH7

COM

MUX ADDRESS AND RANGE

INTERNAL

CLOCK

CONTROL

LOGIC

+

12-/14-/16-BIT

SAMPLING ADC

–

DATA OUT

2.5V

REFERENCE

8k

4.096V

1.6384X

SERIAL I/O

CONVST

SDI

BUSY

SCK

RD

OVDD

SDO

MUXOUT–

AGND1

MUXOUT+ ADC+

ADC–

VREF

REFCOMP

1859 BD

AGND2 AGND3 DGND

TEST CIRCUITS

Load Circuits for Access Timing

5V

DN

1k

25pF

1k

DN

25pF

(A) Hi-Z TO VOH AND VOL TO VOH

(B) Hi-Z TO VOL AND VOH TO VOL

1859 TC01

Load Circuits for Output Float Delay

5V

DN

1k

1k

DN

25pF

25pF

(A) VOH TO Hi-Z

(B) VOL TO Hi-Z

1859 TC02

185789fb

8

For more information www.linear.com/LTC1857

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