ADC1251 Datasheet, PDF (1/16 Pages) National Semiconductor (TI) – Self-Calibrating 12-Bit Plus Sign A/D Converter with Sample-and-Hold

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} a_{5V 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} g_5V
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 T_A ^s a85 C)
ADC1251BIJ
ADC1251CIJ
J24A
Military
Package
(b55 C ^s T_A ^s a125 C)
ADC1251CMJ
ADC1251CMJ 883
J24A
RRD-B30M115 Printed in U S A