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National Semiconductor - Self-Calibrating 12-Bit Plus Sign A/D Converter with Sample-and-Hold

Numéro de référence ADC1251
Description Self-Calibrating 12-Bit Plus Sign A/D Converter with Sample-and-Hold
Fabricant National Semiconductor 
Logo National Semiconductor 





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ADC1251 fiche technique
December 1994
ADC1251 Self-Calibrating 12-Bit Plus Sign
A D Converter with Sample-and-Hold
General Description
The ADC1251 is a CMOS 12-bit plus sign successive ap-
proximation analog-to-digital converter On request the
ADC1251 goes through a self-calibration cycle that adjusts
for any zero full scale or linearity errors The ADC1251 also
has the ability to go through an Auto-Zero cycle that cor-
rects the zero error during every conversion
The analog input to the ADC1251 is tracked and held by the
internal circuitry so an external sample-and-hold is not re-
quired The ADC1251 has an S H control input which direct-
ly controls the track-and-hold state of the A D A unipolar
analog input voltage range (0 to a5V) or a bipolar range
(b5V to a5V) can be accommodated with g5V supplies
The 13-bit data result is available on the eight outputs of the
ADC1251 in two bytes high-byte first and sign extended
The digital inputs and outputs are compatible with TTL or
CMOS logic levels
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
Y No missing codes over temperature
Y TTL MOS input output compatible
Key Specifications
Y Resolution
12 bits plus sign
Y Conversion Time
8 ms (max)
Y Sampling Rate
83 kHz (max)
Y Linearity Error
g0 6 LSB (g0 0146%) (max)
Y Zero Error
g1 LSB (max)
Y Full Scale Error
g1 5 LSB (max)
Y Power Consumption g5V
113 mW (max)
Applications
Y Digital signal processing
Y High resolution process control
Y Instrumentation
Simplified Block Diagram
Connection Diagram
Dual-In-Line Package
TRI-STATE is a registered trademark of National Semiconductor Corporation
C1995 National Semiconductor Corporation TL H 11024
Top View
TL H 11024 – 2
Ordering Information
TL H 11024 – 1
Industrial
Package
(b40 C s TA s a85 C)
ADC1251BIJ
ADC1251CIJ
J24A
Military
Package
(b55 C s TA s a125 C)
ADC1251CMJ
ADC1251CMJ 883
J24A
RRD-B30M115 Printed in U S A

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