Rainbow Electronics ADC1251 - Manual

TL H 11025
ADC12451
Dynamically-Tested
Self-Calibrating
12-Bit
Plus
Sign
AD
Converter
with
Sample-and-Hold
December 1994
ADC12451 Dynamically-Tested Self-Calibrating
12-Bit Plus Sign A D Converter with Sample-and-Hold
General Description
The ADC12451 is a CMOS 12-bit plus sign successive ap-
proximation analog-to-digital converter whose dynamic
specifications (S N THD etc ) are tested and guaranteed
On request the ADC12451 goes through a self-calibration
cycle that adjusts linearity zero and full-scale errors The
ADC12451 also has the ability to go through an Auto-Zero
cycle that corrects the zero error during every conversion
The analog input to the ADC12451 is tracked and held by
the internal circuitry so an external sample-and-hold is not
required The ADC12451 has a S H control input which di-
rectly controls the track-and-hold state of the A D A unipo-
lar analog input voltage range (0V to a5V) or a bipolar
range (b5V to a5V) can be accommodated with
g 5V sup-
plies
The 13-bit data result is available on the eight outputs of the
ADC12451 in two bytes high-byte first and sign extended
The digital inputs and outputs are compatible with TTL or
CMOS logic levels
Applications
Y Digital Signal Processing
Y Audio
Y Telecommunications
Y High Resolution Process Control
Y Instrumentation
Features
Y Self-calibration provides excellent temperature stability
Y Internal sample-and-hold
Y 8-bit mP DSP interface
Y Bipolar input range with a single a5V reference
Key Specifications
Y Resolution 12 bits plus sign
Y Conversion Time 7 7 ms (max)
Y Sampling Rate 83 kHz (max)
Y Bipolar Signal Noise 73 5 dB (min)
Y Total Harmonic Distortion b 78 0 dB (max)
Y Aperture Time 100 ns
Y Aperture Jitter 100 ps
rms
Y Zero Error g 2 LSB (max)
Y Positive Full-Scale Error g 1 5 LSB (max)
Y Power Consumption g 5V 113 mW (max)
Simplified Block Diagram
TL H 11025 – 1
Connection Diagram
Dual-In-Line Package
TL H 11025 – 2
Top View
Ordering Information
Industrial
Package
(b40 C s T
A s 85 C)
ADC12451CIJ J24A
Military
Package
(b55 C s T
A s 125 C)
ADC12451CMJ
J24A
ADC12451CMJ 883
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C1995 National Semiconductor Corporation RRD-B30M115 Printed in U S A