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CLC5957

12-Bit, 70 MSPS Broadband Monolithic A/D Converter

General Description

The CLC5957 is a monolithic 12-bit, 70MSPS analog-to-

digital converter. The device has been optimized for use in

IF-sampled digital receivers and other applications where

high resolution, high sampling rate, wide dynamic range, low

power dissipation, and compact size are required. The

CLC5957 features differential analog inputs, low jitter differ-

ential universal clock inputs, a low distortion track-and-hold

with 0-300MHz input bandwidth, a bandgap voltage refer-

ence, data valid clock output, TTL compatible CMOS (3.3V

or 2.5V) programmable output logic, and a proprietary 12-bit

multi-stage quantizer. The CLC5957 is fabricated on the

ABIC-V 0.8 micron BiCMOS process.

The CLC5957 features a 74dBc spurious free dynamic

range (SFDR) and a 67dB signal to noise ratio (SNR). The

wideband track-and-hold allows sampling of IF signals to

greater than 250MHz. The part produces two-tone, dithered,

SFDR of 83dBFS at 75MHz input frequency. The differential

analog input provides excellent common mode rejection,

while the differential universal clock inputs minimize jitter.

The 48-pin TSSOP package provides an extremely small

footprint for applications where space is a critical consider-

ation. The CLC5957 operates from a single +5V power

supply. Operation over the industrial temperature range of

-40˚C to +85˚C is guaranteed. National Semiconductor tests

each part to verify compliance with the guaranteed specifi-

cations.

Features

n 70MSPS

n Wide dynamic range:

— SFDR: 74dBc

— SFDR with dither: 85dBFS

— SNR: 67dB

n IF sampling capability

n Input bandwidth = 0-300MHz

n Low power dissipation: 640mW

n Very small package: 48-pin TSSOP

n Single +5V supply

n Data valid clock output

n Programmable output levels: 3.3V or 2.5V

Applications

n Cellular base stations

n Digital communications

n Infrared/CCD imaging

n IF sampling

n Electro-optics

n Instrumentation

n Medical imaging

n High definition video

01502928

Block Diagram

01502902

April 2002

CLC5957 12-Bit, 70 MSPS Broadband Monolithic A/D Converter

1 2 3 4 5 6 ... 15 16

Summary of Contents

Page 1 - Block Diagram

CLC595712-Bit, 70 MSPS Broadband Monolithic A/D ConverterGeneral DescriptionThe CLC5957 is a monolithic 12-bit, 70MSPS analog-to-digital converter. Th

Page 2 - Pin Descriptions

Single IF Down Converter (Diversity Receiver Chipset)0150292001502922CLC5957www.national.com 10

Page 3 - Error (Note 2) −30 0 30 mV

Evaluation Board01502923Evaluation Board SchematicCLC5957www.national.com11

Page 4

Evaluation Board (Continued)01502924CLC5957PCASM Layer 101502926CLC5957PCASM Layer 2CLC5957www.national.com 12

Page 5

Evaluation Board (Continued)01502925CLC5957PCASM Layer 301502927CLC5957PCASM Layer 4CLC5957www.national.com13

Page 6 - 01502908

CLC5957 ApplicationsAnalog Inputs and BiasFigure 1depicts the analog input and bias scheme. Each ofthe differential analog inputs are internally biase

Page 7

CLC5957 Applications (Continued)Digital Outputs and Level SelectFigure 6depicts the digital output buffer and bias used in theCLC5957. Although each o

Page 8 - = +5V) (Continued)

Physical Dimensions inches (millimeters) unless otherwise noted48-Lead TSSOP (Millimeters Only)Order Number CLC5957MTDNS Package Number MTD48LIFE SUPP

Page 9 - Timing Diagrams

Pin Configuration01502901Ordering InformationCLC5957MTD 48-Pin TSSOPCLC5957MTDX 48-Pin TSSOP (TapedReel)CLC5957PCASM Evaluation BoardPin DescriptionsP

Page 10 - 01502922

Absolute Maximum Ratings (Note 1)If Military/Aerospace specified devices are required,please contact the National Semiconductor Sales Office/Distribut

Page 11

Converter Electrical Characteristics (Continued)The following specifications apply for AVCC=DVCC= +5V, 66MSPS. Boldface limits apply for TA=Tmin= −40˚

Page 12 - Evaluation Board (Continued)

Converter Electrical Characteristics (Continued)The following specifications apply for AVCC=DVCC= +5V, 66MSPS. Boldface limits apply for TA=Tmin= −40˚

Page 13

Typical Performance Characteristics (AVCC=DVCC= +5V)01502905 0150290401502903015029060150290701502908CLC5957www.national.com 6

Page 14 - CLC5957 Applications

Typical Performance Characteristics (AVCC=DVCC= +5V) (Continued)01502909 01502910015029110150291201502913 01502914CLC5957www.national.com7

Page 15 - CLC5957 Evaluation Board

Typical Performance Characteristics (AVCC=DVCC= +5V) (Continued)015029300150291501502916 01502917CLC5957www.national.com 8

Page 16 - NS Package Number MTD48

Timing Diagrams015029F8CLC5957 APERTURE DELAY Diagram015029F9CLC5957 ENCODE to Data Timing Diagram015029H1CLC5957 ENCODE to DAV Timing Diagram015029H2

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