Rainbow Electronics ADC10738 - Manual

TL H 11390
ADC10731ADC10732ADC10734ADC10738
10-Bit
Plus
Sign
Serial
IO
AD
Converters
with
Mux
SampleHold
and
Reference
December 1994
ADC10731 ADC10732 ADC10734 ADC10738
10-Bit Plus Sign Serial I O A D Converters
with Mux Sample Hold and Reference
General Description
This series of CMOS 10-bit plus sign successive approxima-
tion A D converters features versatile analog input multi-
plexers sample hold and a 2 5V band-gap reference The
1- 2- 4- or 8-channel multiplexers can be software config-
ured for single-ended or differential mode of operation
An input sample hold is implemented by a capacitive refer-
ence ladder and sampled-data comparator This allows the
analog input to vary during the A D conversion cycle
In the differential mode valid outputs are obtained even
when the negative inputs are greater than the positive be-
cause of the 10-bit plus sign output data format
The serial I O is configured to comply with the NSC
MICROWIRE
TM serial data exchange standard for easy in-
terface to the COPS TM and HPC TM families of controllers
and can easily interface with standard shift registers and
microprocessors
Applications
Y Medical instruments
Y Portable and remote instrumentation
Y Test equipment
Features
Y 0V to 5V analog input range with single 5V power
supply
Y Serial I O (MICROWIRE compatible)
Y 1- 2- 4- or 8-channel differential or single-ended
multiplexer
Y Software or hardware power down
Y Analog input sample hold function
Y Ratiometric or absolute voltage referencing
Y No zero or full scale adjustment required
Y No missing codes over temperature
Y TTL CMOS input output compatible
Y Standard DIP and SO packages
Key Specifications
Y Resolution 10 bits plus sign
Y Single supply 5V
Y Power dissipation 37 mW (Max)
In powerdown mode 18 mW
Y Conversion time 5 ms (Max)
Y Sampling rate 74 kHz (Max)
Y Band-gap reference 2 5V g 2% (Max)
ADC10738 Simplified Block Diagram
TL H 11390 – 1
COPS TM HPC TM and MICROWIRE TM are trademarks of National Semiconductor Corporation
C1995 National Semiconductor Corporation RRD-B30M75 Printed in U S A