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ADS7861 Datasheet(PDF) 10 Page - Texas Instruments

No. de pieza ADS7861
Descripción Electrónicos  Dual, 500kSPS, 12-Bit, 2 2 Channel Simultaneous Sampling ANALOG-TO-DIGITAL CONVERTER
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
Logo TI1 - Texas Instruments

ADS7861 Datasheet(HTML) 10 Page - Texas Instruments

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ADS7861
10
SBAS110D
Code (decimal)
8000
7000
6000
5000
4000
3000
2000
1000
0
2044
2045
2046
2047
2048
FIGURE 5. Histogram of 8,000 Conversions of a DC Input.
FIGURE 6. Test Circuits for Timing Specifications.
FIGURE 7. Level Shift Circuit for Bipolar Input Ranges.
TRANSITION NOISE
Figure 5 shows a histogram plot for the ADS7861 following
8,000 conversions of a DC input. The DC input was set at
output code 2046. All but one of the conversions had an
output code result of 2046 (one of the conversions resulted
in an output of 2047). The histogram reveals the excellent
noise performance of the ADS7861.
BIPOLAR INPUTS
The differential inputs of the ADS7861 were designed to
accept bipolar inputs (–VREF and +VREF) around the internal
reference voltage (2.5V), which corresponds to a 0V to 5V
input range with a 2.5V reference. By using a simple op amp
circuit featuring a single amplifier and four external resis-
tors, the ADS7861 can be configured to except bipolar
inputs. The conventional
±2.5V, ±5V, and ±10V input
ranges can be interfaced to the ADS7861 using the resistor
values shown in Figure 7.
TIMING AND CONTROL
The operation of the ADS7861 can be configured in four
different modes by using the address pins M0, M1 and A0.
The M0 pin selects between two- and four-channel operation
(in two-channel operation, the A0 pin selects between Chan-
nels 0 and 1; in four-channel operation the A0 pin is ignored
and the channels are switched automatically after each
conversion). The M1 pin selects between having serial data
transmitted simultaneously on both the Serial A data output
and the Serial B data output or having both channels output
data through the Serial A port. The A0 pin selects either
Channel 0 or Channel 1 (see Pin Descriptions and Serial
Output Truth Table for more information).
The next four sections will explain the four different modes
of operation.
Mode I (M0 = 0, M1 = 0)
With the M0 and M1 pins both set to ‘0’, the ADS7861 will
operate in two-channel operation (the A0 pin must be used
to switch between Channels A and B). A conversion is
initiated by bringing CONVST HIGH for a minimum of
15ns. It is very important that CONVST be brought HIGH
a minimum of 10ns prior to a rising edge of the external
clock or 5ns after the rising edge. If CONVST is brought
R
1
R
2
+IN
–IN
REF
OUT
2.5V
4k
20k
Bipolar Input
BIPOLAR INPUT
R
1
R
2
±10V
1k
5k
±5V
2k
10k
±2.5V
4k
20k
OPA132
ADS7861
DATA
1.4V
Test Point
3k
100pF
C
LOAD
t
R
DATA
Voltage Waveforms for DATA Rise and Fall Times t
R, and tF.
V
OH
V
OL
t
F
DESCRIPTION
ANALOG INPUT
Full-Scale Input Span
–VREF to +VREF(1)
Least Significant
(–VREF to +VREF)/4096(2)
Bit (LSB)
+Full Scale
4.99878V
0111 1111 1111
7FF
Midscale
2.5V
0000 0000 0000
000
Midscale – 1 LSB
2.49878V
1111 1111 1111
FFF
–Full Scale
0V
1000 0000 0000
800
NOTES: (1) –VREF to +VREF around VREF. With a 2.5V reference, this corre-
sponds to a 0V to 5V input span. (2) 1.22mV with a 2.5V reference.
TABLE I. Ideal Input Voltages and Output Codes.
DIGITAL OUTPUT
BINARY TWO’S COMPLEMENT
BINARY CODE
HEX CODE


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