XRD87L94AID Просмотр технического описания (PDF) - Exar Corporation

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XRD87L94AID

CMOS, 1 MSPS, 12-Bit Analog-to-Digital Converter with Parallel Logic Interface Port

Exar Corporation 

...the analog plus companyTM

FEATURES

 12-Bit ADC with DNL = +1 LSB, INL = +2.5 LSB

 SNR > 60 dB

 Sampling Frequency < 1 MHz

 Single 3.3 V Supply

 Rail-to-Rail Input Range

 VREF Range: 1.5 V to VDD

 CMOS Low Power: 30 mW (typ)

 1/4, 1/2 and 3/4 Scale Reference Resistor Taps

 Three-State Outputs

 Binary and Two’s Complement Digital Output Mode

 Latch-Up Proof

 ESD: 2000 V Minimum Protection

XRD87L94

CMOS, 1 MSPS, 12-Bit

Analog-to-Digital Converter

with Parallel Logic Interface Port

APPLICATIONS

 Scanners

 Digital Cameras

 Instrumentation

 Medical Imaging

 Digital Oscilloscopes

 Spectrum Analysis

March 1996-3

GENERAL DESCRIPTION

The XRD87L94 is a 1 MSPS 12-bit subranging

Analog-to-Digital Converter with DNL = +1 LSB and INL = +2.5

LSB. The XRD87L94 contains an internal track and hold and an

analog input bandwidth of 10 MHz.

The XRD87L94 operates with a single 3.3 V supply while

consuming 30 mW of power (typical). Separate pins for

reference ladder terminals and power supplies allow flexibility

for various AIN, VREF, and power supply ranges.

Data is presented at the parallel output port every clock cycle

after a 2.5 cycle pipeline delay from sample edge. The digital

output port is also equipped with a 3-state function. MINV

enables binary and 2’s complement data formatting. Through

pins R1-R3, transfer function adjustment can be

accommodated.

SIMPLIFIED BLOCK DIAGRAM

AIN

VRT

3

R1-R3

VRB

Aperture

CLK

MINV

n1

n

S/H

n2

Fine

Comp.

Coarse

Comp.

n1

Lm

11

A

R

T

O

n2

C

H

M

1

3

3

AVDD AGND

Clock Logic

L 12

A

T

C

H

12

DB0-DB11

OE

Rev. 1.00

E1996

EXAR Corporation, 48720 Kato Road, Fremont, CA 94538 z (510) 668-7000 z FAX (510) 668-7017

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