CLC5957PCASM/NOPB National Semiconductor, CLC5957PCASM/NOPB Datasheet

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CLC5957PCASM/NOPB

Manufacturer Part Number
CLC5957PCASM/NOPB
Description
Manufacturer
National Semiconductor
Datasheet
1.CLC5957PCASMNOPB.pdf (16 pages)

Specifications of CLC5957PCASM/NOPB

Lead Free Status / Rohs Status
Compliant
© 2002 National Semiconductor Corporation
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.
Block Diagram
DS015029
Features
n 70MSPS
n Wide dynamic range:
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
— SFDR: 74dBc
— SFDR with dither: 85dBFS
— SNR: 67dB
01502928
01502902
www.national.com
April 2002

CLC5957PCASM/NOPB Summary of contents

Page 1

... 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. Block Diagram © ...

Page 2

Pin Configuration Pin Descriptions Pin Pin Name No 13 ENCODE 9, 10 ENCODE V CM 30–34, D0–D11 39–45 1–4, 8, 11, 12, 15, 19, GND 20, 23–26, 35, 36, 47, 48 +AV 5–7, 16–18, 22 ...

Page 3

... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Positive Supply Voltage ( Differential Voltage between any two Grounds Analog Input Voltage Range Digital Input Voltage Range Output Short Circuit Duration ...

Page 4

Converter Electrical Characteristics The following specifications apply for AV +85˚C, all other limits T = 25˚C (Note 3). A Symbol Parameter ANALOG INPUTS V Analog Diff Input Voltage Range IN Analog Input Resistance R (SE) IN (Single-Ended) R (Diff) Analog ...

Page 5

Converter Electrical Characteristics The following specifications apply for AV +85˚C, all other limits T = 25˚C (Note 3). A Symbol Parameter POWER REQUIREMENTS Total Operating Supply Current (Note Power Dissipation (Note 2) Power Supply Rejection Ratio Note ...

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Typical Performance Characteristics www.national.com ( +5V 01502905 01502903 01502907 6 01502904 01502906 01502908 ...

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Typical Performance Characteristics ( +5V) (Continued 01502909 01502911 01502913 7 01502910 01502912 01502914 www.national.com ...

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Typical Performance Characteristics www.national.com ( +5V) (Continued 01502930 01502916 8 01502915 01502917 ...

Page 9

Timing Diagrams CLC5957 APERTURE DELAY Diagram CLC5957 ENCODE to Data Timing Diagram CLC5957 ENCODE to DAV Timing Diagram CLC5957 DAV to Data Timing Diagram 9 015029F8 015029F9 015029H1 015029H2 www.national.com ...

Page 10

Single IF Down Converter (Diversity Receiver Chipset) www.national.com 01502922 10 01502920 ...

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Evaluation Board Evaluation Board Schematic 11 01502923 www.national.com ...

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Evaluation Board (Continued) www.national.com 01502924 CLC5957PCASM Layer 1 01502926 CLC5957PCASM Layer 2 12 ...

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Evaluation Board (Continued) 01502925 CLC5957PCASM Layer 3 01502927 CLC5957PCASM Layer 4 13 www.national.com ...

Page 14

CLC5957 Applications Analog Inputs and Bias Figure 1 depicts the analog input and bias scheme. Each of the differential analog inputs are internally biased to a nomi- nal voltage of 2.40V DC through a 500 impedance buffer. This enables a ...

Page 15

CLC5957 Applications Digital Outputs and Level Select Figure 6 depicts the digital output buffer and bias used in the CLC5957. Although each of the twelve output bits uses a controlled current buffer to limit supply transients rec- ommended ...

Page 16

... NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant ...