Rainbow Electronics ADC12L038 - Manual

TL H 11830
ADC12L030ADC12L032ADC12L034ADC12L038 33V
Self-Calibrating
12-Bit
Plus
Sign
Serial
IO
AD
Converters
with
MUX
and
SampleHold
March 1995
ADC12L030 ADC12L032 ADC12L034 ADC12L038
3 3V Self-Calibrating 12-Bit Plus Sign Serial I O
A D Converters with MUX and Sample Hold
General Description
The ADC12L030 family is 12-bit plus sign successive ap-
proximation A D converters with serial I O and configurable
input multiplexers These devices are fully tested with a sin-
gle 3 3V power supply The ADC12L032 ADC12L034 and
ADC12L038 have 2 4 and 8 channel multiplexers respec-
tively Differential multiplexer outputs and A D inputs are
available on the MUXOUT1
MUXOUT2 A DIN1 and
A DIN2 pins The ADC12L030 has a two channel multiplex-
er with the multiplexer outputs and A D inputs internally
connected On request these A Ds go through a self cali-
bration process that adjusts linearity zero and full-scale er-
rors to less than
g 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 a3 3V) can be accommodated with a single a3 3V
supply 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 two’s compliment output
data format
The serial I O is configured to comply with NSC’s MICRO-
WIRE
TM and Motorola’s SPI standards For complementary
voltage references see the LM4040 LM4041 or LM9140
data sheets
Applications
Y Portable Medical instruments
Y Portable computing
Y Portable Test equipment
Features
Y 0V to 3 3V analog input range with single 3 3V power
supply
Y Serial I O (MICROWIRE and SPI Compatible)
Y 2 4 or 8 channel differential or single-ended
multiplexer
Y Analog input sample hold function
Y Power down mode
Y Variable resolution and conversion rate
Y Programmable acquisition time
Y Variable digital output word length and format
Y No zero or full scale adjustment required
Y Fully tested and guaranteed with a 2 5V reference
Y No Missing Codes over temperature
Key Specifications
Y Resolution 12-bit plus sign
Y 12-bit plus sign conversion time 8 8 ms (min)
Y 12-bit plus sign sampling rate 73 kHz (max)
Y Integral linearity error g 1 LSB (max)
Y Single supply 3 3V g 10%
Y Power dissipation 15 mW (max)
Power down 40 mW (typ)
ADC12L038 Simplified Block Diagram
TL H 11830 – 1 TRI-STATE is a registered trademark of National Semiconductor Corporation
COPS TM microcontrollers HPC TM and MICROWIRE TM are trademarks of National Semiconductor Corporation
Microsoft TM is a trademark of Microsoft Corporation
C1995 National Semiconductor Corporation RRD-B30M75 Printed in U S A