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PDF ADS1201 Data sheet ( Hoja de datos )
| Número de pieza | ADS1201 | |
| Descripción | High Dynamic Range DELTA-SIGMA MODULATOR | |
| Fabricantes | Burr-Brown Corporation | |
| Logotipo |  |
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®
ADS1201
ADS1201
High Dynamic Range
DELTA-SIGMA MODULATOR
FEATURES
q 130dB DYNAMIC RANGE
q FULLY DIFFERENTIAL INPUT
q TWO-WIRE INTERFACE
q INTERNAL/EXTERNAL REFERENCE
q ON-CHIP SWITCHES FOR CALIBRATION
APPLICATIONS
q INDUSTRIAL PROCESS CONTROL
q INSTRUMENTATION
q SMART TRANSMITTERS
q PORTABLE INSTRUMENTS
q WEIGH SCALES
q PRESSURE TRANSDUCERS
DESCRIPTION
The ADS1201 is a precision, 130dB dynamic range,
delta-sigma (∆Σ) modulator operating from a single
+5V supply. The differential inputs are ideal for direct
connection to transducers or low level signals. With
the appropriate digital filter and modulator rate, the
device can be used to achieve 24-bit analog-to-digital
(A/D) conversion with no missing codes. Effective
resolution of 20 bits can be maintained with a digital
filter bandwidth of 1kHz at a modulator rate of 320kHz.
The ADS1201 is designed for use in high resolution
measurement applications including smart transmit-
ters, industrial process control, weigh scales, chroma-
tography, and portable instrumentation. It is available
in a 16-lead SOIC package.
AVDD AGND
REF IN
REF OUT
+2.5V
Reference
VBIAS
Bias
Generator
AINP
AINN
Second-Order
∆Σ
Modulator
BIASEN
REFEN
MOUT
MCLK
CAL GAIN/OFFSET
DVDD DGND
International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: (520) 746-1111
Twx: 910-952-1111 • Internet: http://www.burr-brown.com/ • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
©1997 Burr-Brown Corporation
PDS-1417C
Printed in U.S.A. October, 1999
1 page  
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.
CMRR vs VDIN
110
105
100
95
90
85
80
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
VDIN (V)
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.
Analog Supply
200Ω
200Ω
10µF
0.1µF
47pF
47pF
1 AVDD
REFEN 16
2 REFOUT
MOUT 15
3 REFIN
MCLK 14
4 NIC
DVDD 13
ADS1201
5 AINP
DGND 12
6 AINN
CAL 11
7 AGND GAIN/OFFSET 10
8 VBIAS
BIASEN 9
Digital
Supply
0.1µF
Processor
FIGURE 1. Connection Diagram for the ADS1201 Delta-Sigma Modulator Including External Processor.
5 ADS1201
®
5 Page 
+5V
10Ω
+
10µF
0.1µF
1 AVDD
REFEN 16
2 REFOUT
MOUT 15
3 REFIN
MCLK 14
4 NIC
DVDD 13
ADS1201
5 AINP
DGND 12
6 AINN
CAL 11
7 AGND GAIN/OFFSET 10
8 VBIAS
BIASEN 9
0.1µF
FIGURE 10. Power Supply Connection Using One Power Plane and One Digital Plane.
6kΩ
10kΩ
8
100µA
7
100µA
12
REF200
54
3
0.1µF
1 AVDD
REFEN 16
2 REFOUT
MOUT 15
3 REFIN
MCLK 14
1µF 4 NIC
DVDD 13
ADS1201
0.1µF
5 AINP
DGND 12
6 AINN
CAL 11
7 AGND GAIN/OFFSET 10
8 VBIAS
BIASEN 9
Isolated Power
+5V
Opto
Coupler
DSP
MDATA
+5V
SCLK
SDATA
+5V
Opto
Coupler
MCLK
FIGURE 11. Bridge Transducer Interface with Current Excitation.
11
ADS1201
®
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet ADS1201.PDF ] | |
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