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ADS1201 Datasheet(PDF) 5 Page - Burr-Brown (TI)

[Old version datasheet] Texas Instruments acquired Burr-Brown Corporation. Click here to check the latest version.
Part # ADS1201
Description  High Dynamic Range DELTA-SIGMA MODULATOR
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Manufacturer  BURR-BROWN [Burr-Brown (TI)]
Direct Link  http://www.burr-brown.com
Logo BURR-BROWN - Burr-Brown (TI)

ADS1201 Datasheet(HTML) 5 Page - Burr-Brown (TI)

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5
®
ADS1201
FIGURE 1. Connection Diagram for the ADS1201 Delta-Sigma Modulator Including External Processor.
110
105
100
95
90
85
80
CMRR vs V
DIN
V
DIN (V)
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
TYPICAL PERFORMANCE CURVES (Cont.)
At TA = +25°C, AVDD = DVDD = +5V, MCLK = 320kHz, REFEN LOW, BIASEN LOW, and external +2.5V reference, unless otherwise specified.
ADS1201
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
AV
DD
REF
OUT
REF
IN
NIC
A
INP
A
INN
AGND
V
BIAS
REF
EN
MOUT
MCLK
DV
DD
DGND
CAL
GAIN/OFFSET
BIAS
EN
Processor
200
Analog Supply
10
µF
0.1
µF
Digital
Supply
200
0.1
µF
47pF
47pF
GENERAL DESCRIPTION
The ADS1201 is a single channel, second-order, CMOS
analog modulator designed for high resolution conversions
from dc to 1000Hz. The output of the converter (MOUT)
provides a stream of digital ones and zeros. The time
average of this serial output is proportional to the analog
input voltage. The combination of an ADS1201 and a
processor that is programmed to implement a digital filter
results in a high resolution A/D converter system. This
system allows flexibility with the digital filter design and is
capable of A/D conversion results that have a dynamic range
that exceeds 130dB (see Figure 1).
THEORY OF OPERATION
The differential analog input of the ADS1201 is imple-
mented with a switched capacitor circuit. This switched
capacitor circuit implements a 2nd-order modulator stage
which digitizes the input signal into a binary output stream.
The input stage of the converter can be configured to sample
an analog signal or to perform a calibration which quantifies
offset and gain errors. The sample clock (MCLK) provides
the switched capacitor network and modulator clock signal
for the A/D conversion process, as well as the output data
framing clock. Different frequencies for this clock allows
for a variety of performance solutions in resolution and
signal bandwidth. The analog input signal is continuously
sampled by the A/D converter and compared to an internal
or external voltage reference. A digital stream appears at the
output of the converter. This digital stream accurately repre-
sents the analog input voltage over time.


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