clc5956 National Semiconductor Corporation, clc5956 Datasheet

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clc5956

Manufacturer Part Number
clc5956
Description
12-bit, 65 Msps Broadband Monolithic A/d Converter
Manufacturer
National Semiconductor Corporation
Datasheet

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© 1999 National Semiconductor Corporation
CLC5956
12-bit, 65 MSPS Broadband Monolithic A/D Converter
General Description
The
analog-to-digital converter subsystem. The device has been
optimized for use in cellular base stations and other applica-
tions where high resolution, high sampling rate, wide dy-
namic range, low power dissipation, and compact size are
required. The CLC5956 features differential analog inputs,
low jitter differential PECL clock inputs, a low distortion
track-and-hold with DC to 300 MHz input bandwidth, a band-
gap voltage reference, TTL compatible CMOS output logic,
and a proprietary 12-bit multi-stage quantizer. The CLC5956
is fabricated on the ABIC-IV 0.8 micron BiCMOS process.
The part features a 73 dB spurious free dynamic range
(SFDR) and 67 dB SNR. The wideband track-and-hold al-
lows sampling of IF signals to greater than 250 MHz. The
part produces two-tone, dithered, spurious-free dynamic
range of 83 dBFS at 75 MHz input frequency. The differential
analog input provides excellent common-mode rejection,
while the differential PECL clock inputs permit the use of bal-
anced transmission to minimize jitter in distributed systems.
The 48-pin TSSOP package provides an extremely small
footprint for applications where space is a critical consider-
ation. The CLC5956 operates from a single +5V power sup-
ply over the industrial temperature range of −40˚C to +85˚C.
National thoroughly tests each part to verify full compliance
with the guaranteed specifications.
Block Diagram
CLC5956
is
a
monolithic
12-bit,
DS015011
65
MSPS
Features
n Wide dynamic range
n IF sampling capability
n 300 MHz input bandwidth
n Small 48-pin TSSOP
n Single +5V supply
n Low cost
Key Specifications
n Sample Rate
n SFDR
n SFDR with dither
n SNR
n Low power consumption
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
DS015011-2
www.national.com
June 1999
65 MSPS
85 dBFS
615 mW
73 dBc
67 dB

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clc5956 Summary of contents

Page 1

... The 48-pin TSSOP package provides an extremely small footprint for applications where space is a critical consider- ation. The CLC5956 operates from a single +5V power sup- ply over the industrial temperature range of −40˚C to +85˚C. National thoroughly tests each part to verify full compliance with the guaranteed specifications ...

Page 2

... CC +DV 37, 38 www.national.com Ordering Information CLC5956IMTD CLC5956IMTDX CLC5956PCASM DS015011-1 Description Differential input with a common mode voltage of +2.4V. The ADC full scale input is 1.024 V on each of the complimentary input PP signals. Differential clock where ENCODE initiates a new data conversion cycle on each rising edge. Logic for these inputs are a 50% duty cycle differential PECL signal ...

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 ...

Page 4

... TTL load on each digital output). The values of absolute maximum power dissipation will only be reached when the CLC5956 is operated in a severe fault condition (e.g., when input or output pins are driven beyond the power supply voltages, or the power supply polarity is reversed) ...

Page 5

Typical Performance Characteristics SNR and SFDR vs Sample Rate DS015011-6 Differential Non-Linearity DS015011-9 SNR and SFDR vs Input Amplitude DS015011-12 Two Tone Output Spectrum (with Dither) DS015011- +5V) (Continued) ( Single Tone Output Spectrum DS015011-7 ...

Page 6

Typical Performance Characteristics Spectral Response Timing Diagram Full Scale Analog Input Levels Single IF Down Converter www.national.com = DV = +5V) (Continued) ( SINAD vs Input Level DS015011-21 DS015011-19 6 DS015011-22 DS015011-18 DS015011-20 ...

Page 7

Evaluation Board Evaluation Board Schematic 7 DS015011-23 www.national.com ...

Page 8

Evaluation Board (Continued) CLC730079 Layer 1 CLC730079 Layer 3 www.national.com DS015011-24 CLC730079 Layer 2 DS015011-25 CLC730079 Layer 4 8 DS015011-26 DS015011-27 ...

Page 9

... MHz to 260 MHz range which allows sample rates of 10 Msps to 65 Msps. Clock Option The CLC5956 board is configured for a 4x clock input to pro- vide optimal performance with some (i.e., HP8662) synthe- sizers. The HP8662 output has lower jitter above 160 MHz. ...

Page 10

... National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications. 48-Lead TSSOP (Millimeters Only) Order Number CLC5956IMTD NS Package Number MTD48 2. A critical component is any component of a life ...

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