Rainbow Electronics ADC12281 - Manual

ADC12281
12-Bit, 20 MSPS Single-Ended Input, Pipelined A/D
Converter
General Description
The ADC12281 is a monolithic CMOS analog-to-digital con-
verter capable of converting analog input signals into 12-bit
digital words at 20 megasamples per second (MSPS). It
utilizes a pipeline architecture to minimize die size and
power dissipation. Self-calibration and error correction main-
tain accuracy and performance over temperature.
The ADC12281 operates on a 5V power supply and can
digitize single-ended analog input signals in the range of 0V
to 2V. A single convert clock controls the conversion opera-
tion and all digital I/O is TTL compatible.
The ADC12881 is designed to minimize external compo-
nents necessary for the analog input interface. An internal
sample-and-hold circuit samples the single-ended analog
input and an internal amplifier buffers the reference voltage
input.
The Power Down feature reduces power consumption to
20 mW, typical.
The ADC12281 is available in the 32-lead TQFP package
and is designed to operate over the industrial temperature
range of −40˚C to +85˚C.
Features
n Single 5V power supply
n Single-ended analog input
n Internal sample-and-hold
n Internal reference buffer amplifier
n Low offset and gain errors
Key Specifications
n Resolution 12 bits
n Conversion rate up to 20 MSPS
n DNL 0.35 LSB (typ)
n SNR 65.5 dB (typ)
n ENOB 10.5 bits (typ)
n Analog input range 2 V
PP
(min)
n Supply voltage +5V ± 5%
n Power consumption, 20 MHz 443 mW (typ)
Applications
n Digital signal processing front end
n Digital television
n Radar
n High speed data links
n Waveform digitizers
n Quadrature demodulation
Connection Diagram
10102701
32-Lead TQFP Package
Order Number ADC12281CIVT
See NS Package Number VBE32A
TRISTATE& ® is a registered trademark of National Semiconductor Corporation.
November 2002
ADC12281
12-Bit,
20
MSPS
Single-Ended
Input,
Pipelined
A/D
Converter
© 2002 National Semiconductor Corporation DS101027 www.national.com