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other rights of third parties which may result from its use. No license is granted by
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FEATURES
14-BIT Resolution and Accuracy
Fast 12
s Conversion Time (ADC1131J/K)
Low 10ppm/
C Maximum Gain TC
User Choice of Input Range
No Missing Codes
APPLICATIONS
Wide Band Data Digitizing Multi-Channel
Computer Interface High Accuracy Data
Acquisition X-Ray Tomography
Nuclear Accelerator Instrumentation
GENERAL DESCRIPTION
The ADC11130 and ADCI 131 are high speed analog-to-digital
converters packaged in a small 2" x 4" x 0.4" (51 x 102 x 10mm)
module, which perform complete 14-bit conversions in 25
s and 12
s
respectively. Using the successive approximations technique, they
convert analog input voltages into natural binary, offset binary, or two's
complement coded outputs. Data outputs are provided in both parallel
and non-return-to-zero serial form.
Four analog input ranges are available: 0V to +20V, 0V to +10V, 10V,
and 5V. The user selects the desired range by making appropriate
connections to the module terminals. The ADC1130 and ADC1131 can
also be connected so as to perform conversions of less than 14 bit
resolution with a proportionate decrease in conversion time.
TIMING
As shown in Figure 1, the leading edge of the convert command set the
MSB output to Logic "0" and the CLOCK OUT, STATUS, MSB, and
BIT 2 through BIT 12 outputs to Logic "1". Nothing further happens
until the convert command returns to Logic "0", at which time the clock
starts to run and the conversion proceeds.
With the MSB in the Logic "0" state, the internal digital-to-analog
converter's output is compared with the analog input. If the D/A
output is less than the analog input, the first "0" to "1" clock
transition resets the MSB to Logic "1". If the D/A output is
greater than the analog input, the MSB remains at Logic "0".
The first "0" to "1" clock transition also sets the BIT 2 output to Logic
0" and another comparison is made. This process continues through
ach successive bit until the BIT 14 (LSB) comparison is completed.
At this point the STATUS and CLOCK OUT return to Logic "0" and the
conversion cycle ends.
The serial data output is of the non-return-to-zero (NRZ) format. The
data is available, MSB first, 20ns after each of the fourteen "0" to "1"
clock transitions.
1400 Providence Highway, Building #2
Norwood, MA 02062
Phone (781) 551-5500
FAX (781) 551-5555
www.intronicspower.com
14-Bit High Speed
Analog to Digital Converter
Models ADC1130, ADC1131
Figure 1. Timing Diagram
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