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CS5520 Datasheet Preview

CS5520 Datasheet

16-Bit/20-Bit Bridge Transducer A/D Converter

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CS5516
CS5520
16-Bit/20-Bit Bridge Transducer A/D Converter
Features
Description
l On-chip Instrumentation Amplifier
l On-chip Programmable Gain Amplifier
l On-Chip 4-Bit D/A For Offset Removal
l Dynamic Excitation Options
l Linearity Error: ±0.0015% FS
- 20-Bit No Missing Codes
l CMRR at 50/60 Hz > 200 dB
l System Calibration Capability with calibration
read/write option
l 3, 4 or 5 wire Serial Communications Port
l Low Power Consumption: 40 mW
- 10 µW Standby Mode for Portable applications
The CS5516 and CS5520 are complete solutions for dig-
itizing low level signals from strain gauges, load cells,
and pressure transducers. Any family of mV output
transducers, including those requiring bridge excitation,
can be interfaced directly to the CS5516 or CS5520. The
devices offer an on-chip software programmable instru-
mentation amplifier block, choice of DC or AC bridge
excitation, and software selectable reference and signal
demodulation.
The CS5516 uses delta-sigma modulation to achieve
16-bit resolution at output word rates up to 60 Hz. The
CS5520 achieves 20-bit resolution at word rates up to
60 Hz.
The CS5516 and CS5520 sample at a rate set by the
user in the form of either an external CMOS clock or a
crystal. On-chip digital filtering provides rejection of all
frequencies above 12 Hz for a 4.096 MHz clock.
The CS5516 and CS5520 include system calibration to
null offset and gain errors in the input channel. The digi-
tal values associated with the system calibration can be
written to, or read from, the calibration RAM locations at
any time via the serial communications port. The 4-bit
DC offset D/A converter, in conjunction with digital cor-
rection, is initially used to zero the input offset value.
ORDERING INFORMATION
See page 29.
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Cirrus Logic, Inc.
Crystal Semiconductor Products Division
P.O. Box 17847, Austin, Texas 78760
(512) 445 7222 FAX: (512) 445 7581
http://www.crystal.com
Copyright © Cirrus Logic, Inc. 1997
(All Rights Reserved)
MAR ‘95
DS74F1
1




Crystal

CS5520 Datasheet Preview

CS5520 Datasheet

16-Bit/20-Bit Bridge Transducer A/D Converter

No Preview Available !

CS5516
ANALOG CHARACTERISTICS (TA = TMIN to TMAX; VA+, VD+, MDRV+ = 5V; VA-, VD- = -5V;
VREF= 2.5V(external differential voltage across VREF+ and VREF-); fCLK = 4.9152 MHz;
AC Excitation 300 Hz; Gain = 25; Bipolar Mode; Rsource = 300with a 4.7nF to AGND at AIN (see Note 1);
unless otherwise specified.)
Parameter*
Min Typ Max Units
Specified Temperature Range
-40 to +85
°C
Accuracy
Linearity Error
- 0.0015 0.003 ±%FS
Differential Nonlinearity
-
±0.25
±0.5 LSB16
Unipolar Gain Error
(Note 2)
-
±8 ±31 ppm
Bipolar Gain Error
(Note 2)
-
±8 ±31 ppm
Unipolar/Bipolar Gain Drift
- ±1 - ppm/°C
Unipolar Offset
(Note 2)
-
±1 ±2 LSB16
Bipolar Offset
(Note 2)
-
±1 ±2 LSB16
Offset Drift
- ±0.005 - µV/°C
Noise (Referred to Input)
Gain = 25 (25 x 1)
-
250
- nVrms
Gain = 50 (25 x 2)
-
200
- nVrms
Gain = 100 (25 x 4)
-
150
- nVrms
Gain = 200 (25 x 8)
-
150
- nVrms
Notes:
1. The AIN and VREF pins present a very high input resistance at dc and a minor dynamic load which
scales to the master clock frequency. Both source resistance and shunt capacitance are therefore
critical in determining the source impedance requirements of the CS5516 and CS5520 at these pins.
2. Applies after system calibration at the temperature of interest.
Unipolar Mode
Bipolar Mode
µV
LSB’s
% FS
ppm FS
LSB’s
% FS
ppm FS
0.4 0.26 0.0004 4
0.13 0.0002
2
0.76 0.50 0.0008 8
0.26 0.0004
4
1.52 1.00 0.0015 15
0.50 0.0008
8
3.04 2.00 0.0030 30
1.00 0.0015
15
6.08 4.00 0.0061 61
2.00 0.0030
30
VREF = 2.5V
PGA gain = 1
CS5516; 16-Bit Unit Conversion Factors
* Refer to the Specification Definitions immediately following the Pin Description Section.
Specifications are subject to change without notice.
2
DS74F1


Part Number CS5520
Description 16-Bit/20-Bit Bridge Transducer A/D Converter
Maker Crystal
PDF Download

CS5520 Datasheet PDF






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