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CS5501 Datasheet Preview

CS5501 Datasheet

(CS5501 / CS5503) Measurement A/D Converter

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CS5501
CS5503
Low-Cost, 16 & 20-Bit Measurement A/D Converter
Features
l Monolithic CMOS ADC with Filtering
- 6-Pole, Low-Pass Gaussian Filter
l Up to 4 kHz Output Word Rates
- On Chip Self-Calibration Circuitry
- Linearity Error: ±0.0003%
- Differential Nonlinearity:
CS5501: 16-Bit No Missing Codes
(DNL ±1/8 LSB)
CS5503: 20-Bit No Missing Codes
l System Calibration Capability
l Flexible Serial Communications Port
- µC-Compatible Formats
- 3-State Data and Clock Outputs
- UART Format (CS5501 only)
l Pin-Selectable Unipolar/Bipolar Ranges
l Low Power Consumption: 25 mW
- 10 µW Sleep Mode for Portable Applications
l Evaluation Boards Available
Description
The CS5501 and CS5503 are low-cost CMOS A/D con-
verters ideal for measuring low-frequency signals
representing physical, chemical, and biological process-
es. They utilize charge-balance techniques to achieve
16-bit (CS5501) and 20-bit (CS5503) performance with
up to 4 kHz word rates at very low cost.
The converters continuously sample at a rate set by the
user in the form of either a CMOS clock or a crystal. On-
chip digital filtering processes the data and updates the
output register at up to a 4 kHz rate. The converters’ low-
pass, 6-pole Gaussian response filter is designed to al-
low corner frequency settings from 0.1 Hz to 10 Hz in the
CS5501 and 0.5 Hz to 10 Hz in the CS5503. Thus, each
converter rejects 50 Hz and 60 Hz line frequencies as
well as any noise at spurious frequencies.
The CS5501 and CS5503 include on-chip self-calibra-
tion circuitry which can be initiated at any time or
temperature to insure offset and full-scale errors of typi-
cally less than 1/2 LSB for the CS5501 and less than
4 LSB for the CS5503. The devices can also be applied
in system calibration schemes to null offset and gain er-
rors in the input channel.
Each device’s serial port offers two general purpose
modes of operation for direct interface to shift registers
or synchronous serial ports of industry-standard micro-
controllers. In addition, the CS5501’s serial port offers a
third, UART-compatible mode of asynchronous
communication.
ORDERING INFORMATION
See page 33.
I
BP/UPSLEEP
12 11
Calibration
SRAM
SC1 SC2
4
Calibration
Microcontroller
VREF 10
AIN 9
Charge-Balanced A/D Converter
Analog
6-Pole Gaussian
Modulator Low-Pass Digital Filter
AGND 8
DGND 5
Clock Generator Serial Interface Logic
23
18 16 1 19
CLKOUTCLKIN DRDY CS MODESCLK
13 CAL
14 VA+
7 VA-
15 VD+
6 VD-
20 SDATA
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
DS31F2
1




Crystal

CS5501 Datasheet Preview

CS5501 Datasheet

(CS5501 / CS5503) Measurement A/D Converter

No Preview Available !

CS5501/CS5503
CS5501 ANALOG CHARACTERISTICS (TA = TMIN to TMAX; VA+, VD+ = 5V;
VA-, VD- = -5V; VREF = 2.5V; CLKIN = 4.096MHz; Bipolar Mode; MODE = +5V; Rsource = 750with a 1nF
to AGND at AIN (see Note 1); Digital Inputs: Logic 0 = GND; Logic 1 = VD+; unless otherwise specified.)
Parameter*
CS5501-A, B, C
Min Typ Max
CS5501-S, T
Min Typ Max
Units
Specified Temperature Range
-40 to +85
-55 to +125
°C
Accuracy
Linearity Error
-A, S -
0.0015 0.003
-
- 0.003 ±%FS
-B, T - 0.0007 0.0015 - 0.0007 0.0015 ±%FS
-C -
0.0003 0.0012
±%FS
Differential Nonlinearity
TMIN to TMAX - ±1/8 ±1/2 - ±1/8 ±1/2 LSB16
Full Scale Error
(Note 2) -
±0.13 ±0.5
- ±0.13 ±0.5 LSB16
Full Scale Drift
(Note 3) - ±1.2 -
- ±2.3 - LSB16
Unipolar Offset
(Note 2) -
±0.25 ±1
- ±0.25 ±1 LSB16
Unipolar Offset Drift
(Note 3) - ±4.2 -
- +3.0 - LSB16
-25.0
Bipolar Offset
(Note 2) -
±0.25 ±1
- ±0.25 ±1 LSB16
Bipolar Offset Drift
(Note 3) - ±2.1 -
- +1.5 - LSB16
-12.5
Bipolar Negative Full Scale Error (Note 2) -
±0.5 ±2
-
±0.5
±2 LSB16
Bipolar Negative Full Scale Drift (Note 3) -
±0.6
-
- ±1.2 - LSB16
Noise (Referred to Output)
- 1/10 -
- 1/10 - LSBrms
Notes:
1. The AIN pin presents 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 CS5501’s source impedance requirements. For more information refer the text section
Analog Input Impedance Considerations.
2. Applies after calibration at the temperature of interest.
3. Total drift over the specified temperature range since calibration at power-up at 25°C (see Figure 11).
This is guaranteed by design and /or characterization. Recalibration at any temperature will remove
these errors.
Unipolar Mode
Bipolar Mode
µV LSB’s %FS ppm FS LSB’s %FS ppm FS
10 0.26 0.0004 4 0.13 0.0002 2
19 0.50 0.0008 8 0.26 0.0004 4
38 1.00 0.0015 15 0.50 0.0008 8
76 2.00 0.0030 30 1.00 0.0015 15
152 4.00 0.0061 61 2.00 0.0030 30
CS5501 Unit Conversion Factors, VREF = 2.5V
* Refer to the Specification Definitions immediately following the Pin Description Section.
2 DS31F2


Part Number CS5501
Description (CS5501 / CS5503) Measurement A/D Converter
Maker Crystal
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CS5501 Datasheet PDF






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