LTC1850 Datasheet, PDF(1/28 Page) Linear Technology – 8-Channel, 10-Bit/12-Bit, 1.25Msps Sampling ADCs

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LTC1850 Datasheet, PDF (1/28 Pages) Linear Technology – 8-Channel, 10-Bit/12-Bit, 1.25Msps Sampling ADCs

FEATURES

s Flexible 8-Channel Multiplexer

s Single-Ended or Differential Inputs

s Two Gain Ranges Plus Unipolar and Bipolar

Operation

s 1.25Msps Sampling Rate

s Single 5V Supply and 40mW Power Dissipation

s Scan Mode and Programmable Sequencer

s Pin Compatible 10-Bit LTC1850 and 12-Bit LTC1851

s True Differential Inputs Reject Common Mode Noise

s Internal 2.5V Reference

s Parallel Output Includes MUX Address

s Easy Interface to 3V Logic

s Nap and Sleep Shutdown Modes

APPLICATIO S

s High Speed Data Acquisition

s Test and Measurement

s Imaging Systems

s Telecommunications

s Industrial Process Control

s Spectrum Analysis

LTC1850/LTC1851

8-Channel, 10-Bit/12-Bit,

1.25Msps Sampling ADCs

DESCRIPTIO

The 10-bit LTCÂ®1850 and 12-bit LTC1851 are complete

8-channel data acquisition systems. They include a flex-

ible 8-channel multiplexer, a 1.25Msps successive approxi-

mation analog-to-digital converter with sample-and-hold,

an internal 2.5V reference and reference buffer amplifier,

and a parallel output interface. The multiplexer can be con-

figured for single-ended or differential inputs, two gain

ranges and unipolar or bipolar operation.

The ADCs have a scan mode that will repeatedly cycle

through all 8 multiplexer channels and can also be

programmed with a sequence of up to 16 addresses and

configurations that can be scanned in succession. The

sequence memory can also be read back. The reference

and buffer amplifier provide pin strappable ranges of

4.096V, 2.5V and 2.048V. The parallel output includes

the 10-bit or 12-bit conversion result plus the 4-bit

multiplexer address. The digital outputs are powered

from a separate supply allowing for easy interface to 3V

digital logic. Typical power consumption is 40mW at

1.25Msps from a single 5V supply.

, LTC and LT are registered trademarks of Linear Technology Corporation.

BLOCK DIAGRA

CH0

CH1

CH2

CH3

CH4

CH5

CH6

CH7

COM

REFOUT

8-CHANNEL

MULTIPLEXER

2.5V

REFERENCE

REFIN

REFCOMP

REF AMP

LTC1851

INTERNAL

CLOCK

12-BIT

1.25Msps ADC

CONTROL LOGIC

AND

PROGRAMMABLE

SEQUENCER

DATA

LATCHES

OUTPUT

DRIVERS

SHDN

CONVST

DIFF

UNI/BIP

PGA

OVDD

BUSY

DIFFOUT/S6

A2OUT/S5

A1OUT/S4

A0OUT/S3

D11/S2

D10/S1

D9/S0

OGND

1851 BD

Integral Linearity, LTC1851

1.00

0.50

0.00

â0.50

â1.00

0 512 1024 1536 2048 2560 3072 3584 4096

CODE

LTC1850/51 G01

18501f

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