LTC2274I(RevB) View Datasheet(PDF) - Linear Technology

Part Name

Description

Manufacturer

LTC2274I
(Rev.:RevB)

16-Bit, 105Msps Serial Output ADC

Linear Technology 

LTC2274

PIN FUNCTIONS

SENSE (Pin 38): Reference Mode Select and External

Reference Input. Tie SENSE to VDD to select the internal

2.5V bandgap reference. An external reference of 2.5V or

1.25V may be used; both reference values will set a full

scale ADC range of 2.25V (PGA = 0).

VCM (Pin 39): 1.25V Output. Optimum voltage for input

common mode. Must be bypassed to ground with a

minimum of 2.2μF. Ceramic chip capacitors are recom-

mended.

GND (Exposed Pad) (Pin 41): ADC Power Ground. The

Exposed Pad on the bottom of the package needs to be

soldered to ground.

BLOCK DIAGRAM

AIN+

+

S/H

AND PGA

AIN– –

FIRST

STAGE

PIPELINED ADC STAGES

SECOND

STAGE

THIRD

STAGE

FOURTH

STAGE

FIFTH

STAGE

FAM

8B/10B

ENCODER

16

SYNC+

SYNC–

DITHER SIGNAL

GENERATOR

REFERENCE

CONTROL

SENSE

0.5x

VCM

1x OR 2x

ADC

REFERENCE

2.5V

REFERENCE

CLOCK DRIVER

WITH DUTY CYCLE

CONTROL

ENC+

ENC–

CORRECTION

LOGIC

20

OVDD

SERIALIZER

CMLOUT+

CMLOUT–

20X CLK

CONTROL LOGIC

PGA DITH MSBINV SHDN

SCRAMBLER/

PATTERN

GENERATOR

PAT1 PAT0

SCRAM

VDD

PLL

SRR1 SRR0 GND

22743 BD

Figure 1. Functional Block Diagram

2274fb

13

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