ADC12048 Datasheet, PDF (1/30 Pages) National Semiconductor (TI) – 12-Bit Plus Sign 216 kHz 8-Channel Sampling Analog-to-Digital Converter

April 2000
ADC12048
12-Bit Plus Sign 216 kHz 8-Channel Sampling
Analog-to-Digital Converter
General Description
Operating from a single 5V power supply, the ADC12048 is a
12 bit + sign, parallel I/O, self-calibrating, sampling
analog-to-digital converter (ADC) with an eight input fully dif-
ferential analog multiplexer. The maximum sampling rate is
216 kHz. On request, the ADC goes through a
self-calibration process that adjusts linearity, zero and
full-scale errors.
The ADC12048’s 8-channel multiplexer is software program-
mable to operate in a variety of combinations of
single-ended, differential, or pseudo-differential modes. The
fully differential MUX and the 12-bit + sign ADC allows for the
difference between two signals to be digitized.
The ADC12048 can be configured to work with many popular
microprocessors/microcontrollers and DSPs including Na-
tional’s HPC family, Intel386 and 8051, TMS320C25, Mo-
torola MC68HC11/16, Hitachi 64180 and Analog Devices
ADSP21xx.
For complementary voltage references see the LM4040,
LM4041 or LM9140.
Features
n 8-channel programmable Differential or Single-Ended
multiplexer
n Programmable Acquisition Times and user-controllable
Throughput Rates
n Programmable data bus width (8/13 bits)
n Built-in Sample-and-Hold
n Programmable Auto-Calibration and Auto-Zero cycles
n Low power standby mode
n No missing codes
Key Specifications
(f_CLK = 12 MHz)
n Resolution
n 13-bit conversion time
n 13-bit throughput rate
n Integral Linearity Error (ILE)
n Single Supply
n V_IN Range
n Power consumption
— Normal operation
— Stand-by mode
12-bits + sign
3.6 µs, max
216 ksamples/s, min
±1 LSB, max
+5V ±10%
GND to V_A+
34 mW, max
75 µw, max
Applications
n Medical instrumentation
n Process control systems
n Test equipment
n Data logging
n Inertial guidance
Block Diagram
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