ADC12L030_06 Datasheet, PDF (1/35 Pages) National Semiconductor (TI) – 3.3V Self-Calibrating 12-Bit Plus Sign Serial I/O A/D Converters with MUX and Sample/Hold

OBSOLETE
September 2006
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
NOTE: These products are now obsolete.
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 at 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, LM4050 or LM4041 data
sheets.
The ADC12L032 and the ADC12L034 are not recommended
for new designs and are presented for reference only.
Features
n 0V to 3.3V analog input range with single 3.3V supply
n Serial I/O ( MICROWIRE and SPI Compatible)
n 2 or 8 channel differential or single-ended multiplexer
n Power down mode
n Programmable acquisition time
n Variable digital output word length and format
n No zero or full scale adjustment required
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 consumption, active
n Power consumption, pwr 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
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© 2006 National Semiconductor Corporation DS011830
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