Rainbow Electronics ADC12138 - Manual

TL H 12079
ADC12130ADC12132ADC12138
Self-Calibrating
12-Bit
Plus
Sign
Serial
IO
AD
Converters
with
MUX
and
SampleHold
March 1995
ADC12130 ADC12132 ADC12138 Self-Calibrating 12-Bit
Plus Sign Serial I O A D Converters with MUX and
Sample Hold
General Description
The ADC12130 ADC12132 and ADC12138 are 12-bit plus
sign successive approximation A D converters with serial
I O and configurable input multiplexer The ADC12132 and
ADC12138 have a 2 and an 8 channel multiplexer respec-
tively The differential multiplexer outputs and A D inputs
are available on the MUXOUT1 MUXOUT2 A DIN1 and
A DIN2 pins The ADC12130 has a two channel multiplexer
with the multiplexer outputs and A D inputs internally con-
nected The ADC12130 family is tested with a 5 MHz clock
On request these A Ds go through a self calibration pro-
cess that adjusts linearity zero and full-scale errors to typi-
cally less than
g 1 LSB each
The analog inputs can be configured to operate in various
combinations of single-ended differential or pseudo-differ-
ential modes A fully differential unipolar analog input range
(0V to a5V) can be accommodated with a single a5V sup-
ply In the differential modes valid outputs are obtained
even when the negative inputs are greater than the positive
because of the 12-bit plus sign output data format
The serial I O is configured to comply with the NSC
MICROWIRE
TM For complementary voltage references see
the LM4040 LM4041 or LM9140
Applications
Y Pen-based computers
Y Digitizers
Y Global positioning systems
Features
Y Serial I O (MICROWIRE SPI and QSPI Compatible)
Y 2 or 8 channel differential or single-ended multiplexer
Y Analog input sample hold function
Y Power down mode
Y Programmable acquisition time
Y Variable digital output word length and format
Y No zero or full scale adjustment required
Y 0V to 5V analog input range with single 5V power
supply
Key Specifications
Y Resolution 12-bit plus sign
Y 12-bit plus sign conversion time 8 8 ms (max)
Y 12-bit plus sign throughput time 14 ms (max)
Y Integral linearity error g 2 LSB (max)
Y Single supply 3 3V or 5V g 10%
Y Power dissipation
3 3V 15 mW (max)
3 3V power down 40 mW (typ)
5V 33 mW (max)
5V power down 100 mW (typ)
ADC12138 Simplified Block Diagram
TL H 12079 – 1
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C1995 National Semiconductor Corporation RRD-B30M75 Printed in U S A