ADC1103_15 Datasheet, PDF (1/4 Pages) Analog Devices – FAST A/D CONVERTER

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FastAID Converter
..' ADC1103
FEATURES
High Speed
8 Bits in 1.0/-ISmax
10 Bits in 1.5~s max
12 Bits in 3.5/-1Smax
Error Relative to Full Scale :t1lSB max
Gain TC :t10ppmfC max
User Choice of Three Input Ranges
Small 2" x 4" x 0.75" Module
OB _{GENERAL DESCRIPTION}
S _{The ADCll03 is a hi~h speed analog-to-digital converter}
packaged in a small 2' x 4" x 0.75" module. It is available in 8,
O _{10, and 12 bit versions. The 8 bit model performs a conversion}
in 1.0~s max, the 10 bit version in 1.5~s max, and the 12 bit
8 ^{L unit in 3.5/-1Smax, The ADCll03 uses the successive approxi-}
E mations technique to convert analog input voltages into natUral
binary, offset binary, or two's complement coded parallel out-
TE _{put digital data. Careful design and the use of Schottky TTL}
TIMING
As shown in Figure 1, the STATUS output is set to a logic" 1"
on the leading edge of the convert command pulse. On the
trailing edge of the convert command pulse, the MSB output
is set to a logic "1", the remaining bit outputs are set to "0",
and the conversion commences.
The output data is valid 4ns prior to the "1" to "0" transition
of the STATUS output (or "0" to "1" transition of the STATUS
output). This set-up time is sufficient to allow the output data
have resulted in a very fast A/D converter that features an
to be strobed into a following Schottky TTL register on either
error relative to full scale of only :tlLSB max. The unit has a
maximum gain TC of only :tl0ppm/C.
of these two edges. If a standard TTL register is used, data
should not be strobed into it until at least 16ns after the
Three analog input ranges are available. The user, with connec-
tions at the module pins, can select the 0 to +10V range, the
-5V to +5V range, or the -10V to +lOV range. When using the
STATUS and STATUS transitions occur. The SERIAL DATA
output (which does not appear on the standard unit) is of the
nonretUrn-to-zero type (NRZ). The data is available, MSB first,
on successive "0" to "1" DATA STROBE transitions.
0 to +10V range, the output coding is natUral binary. How-
ever, when using either the -5V to +5V range or the -10V to
+lOV range, either offset binary or two's complement coding
can be selected. The user can also choose to short cycle the
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converter (i.e., have it perform conversions of less than the
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maximum number of bits).
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APPLICATIONS
The ADCll03 is a general purpose fast AID converter. It is
especially well suited for applications requiring high through-
put rates with no compromise in accuracy. A typical application
would be a multiple channel data acquisition system, where a
high throughput rate/channel is needed. The ADCll03's high
speed makes it an excellent choice for such applications as fast
Fourier transform analysis, radar pulse analysis, conversion of
analog data acquired from simultaneous sample-and-hold data
collection systems, and for conversion of analog data to be fed
into digital filters and correlators.
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Figure 1. Timing Diagram
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parties which may result from its use. No license is granted by implica-
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