ADC12L030 Datasheet, PDF (1/36 Pages) National Semiconductor (TI) – 3.3V Self-Calibrating 12-Bit Plus Sign Serial I/O A/D Converters with MUX and Sample/Hold

June 1999
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
single 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 multiplexer with the
multiplexer outputs and A/D inputs internally connected. On
request, these A/Ds go through a self calibration process
that adjusts linearity, zero and full-scale errors to less than
±¹â„2 LSB each.
The analog inputs can be configured to operate in various
combinations of single-ended, differential, or
pseudo-differential modes. A fully differential unipolar analog
input range (0V to +3.3V) can be accommodated with a
single +3.3V 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
MICROWIRE™ and Motorola’s SPI standards. For voltage
references, see the LM4040 or LM4041 data sheets.
Features
n 0V to 3.3V analog input range with single 3.3V power
supply
n Serial I/O ( MICROWIRE and SPI Compatible)
n 2, 4, or 8 channel differential or single-ended multiplexer
n Analog input sample/hold function
n Power down mode
n Variable resolution and conversion rate
n Programmable acquisition time
n Variable digital output word length and format
n No zero or full scale adjustment required
n Fully tested and guaranteed with a 2.5V reference
n No Missing Codes over temperature
Key Specifications
n Resolution
n 12-bit plus sign conversion time
n 12-bit plus sign sampling rate
n Integral linearity error
n Single supply
n Power dissipation
n Power down
12-bit plus sign
8.8 µs (min)
73 kHz (max)
±1 LSB (max)
3.3V ±10%
15 mW (max)
40 µW (typ)
Applications
n Portable Medical instruments
n Portable computing
n Portable Test equipment
ADC12L038 Simplified Block Diagram
TRI-STATE^® is a registered trademark of National Semiconductor Corporation.
COPS™ microcontrollers, HPC™ and MICROWIRE™ are trademarks of National Semiconductor Corporation.
Microsoft™ is a trademark of Microsoft Corporation.
© 1999 National Semiconductor Corporation DS011830
DS011830-1
www.national.com