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CS5508 Datasheet Preview

CS5508 Datasheet

16-Bit and 20-Bit A/D Converters

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CS5505/6/7/8
Very Low Power, 16-Bit and 20-Bit A/D Converters
Features
l Very Low Power Consumption
- Single supply +5 V operation: 1.7 mW
- Dual supply ±5 V operation: 3.2 mW
l Offers superior performance to VFCs and
multi-slope integrating ADCs
l Differential Inputs
- Single Channel (CS5507/8) and Four-Channel
(CS5505/6) pseudo-differential versions
l Either 5 V or 3.3 V Digital Interface
l Linearity Error:
- ±0.0015% FS (16-bit CS5505/7)
- ±0.0007% FS (20-bit CS5506/8)
l Output update rates up to 100/second
l Flexible Serial Port
l Pin-Selectable Unipolar/Bipolar Ranges
Description
The CS5505/6/7/8 are a family of low power CMOS A/D
converters which are ideal for measuring low-frequency
signals representing physical, chemical, and biological
processes.
The CS5507/8 have single-channel differential analog
and reference inputs while the CS5505/6 have four
pseudo-differential analog input channels. The
CS5505/7 have a 16-bit output word. The CS5506/8
have a 20-bit output word.The CS5505/6/7/8 sample
upon command up to 100 output updates per second.
The on-chip digital filter offers superior line rejection at
50 and 60 Hz when the device is operated from a
32.768 kHz clock (output word rate = 20 Hz.).
The CS5505/6/7/8 include on-chip self-calibration cir-
cuitry which can be initiated at any time or temperature
to ensure minimum offset and full-scale errors.
The CS5505/6/7/8 serial port offers two general-purpose
modes for the direct interface to shift registers or syn-
chronous serial ports of industry-standard
microcontrollers.
ORDERING INFORMATION
See page 30.
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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
DS59F4
1




Crystal

CS5508 Datasheet Preview

CS5508 Datasheet

16-Bit and 20-Bit A/D Converters

No Preview Available !

CS5505/6/7/8
ANALOG CHARACTERISTICS (TA = TMIN to TMAX; VA+ = 5V ± 10%; VA- = -5V ± 10%; VD+ =
3.3V ± 5%; VREF+ = 2.5V(external); VREF- = 0V; fCLK = 32.768kHz; Bipolar Mode; Rsource = 1kwith a 10nF
to AGND at AIN; Analog input channel AIN1+; AIN- = AGND; unless otherwise specified.) (Notes 1, 2)
CS5505/7-A
CS5507-S
Parameter*
Min Typ Max Min Typ Max Units
Specified Temperature Range
-40 to +85
-55 to +125
°C
Accuracy
Linearity Error
- 0.0015 0.003
- 0.0015 0.003 ±%FS
Differential Nonlinearity
- ±0.25 ±0.5
- ±0.25 ±0.5 LSB16
Full Scale Error
(Note 3) -
±0.25 ±2
-
±0.5
±2 LSB16
Full Scale Drift
(Note 4) - ±0.5 -
- ±2 - LSB16
Unipolar Offset
(Note 3) -
±0.5 ±2
-
±1 ±4 LSB16
Unipolar Offset Drift
(Note 4) - ±0.5 -
- ±1 - LSB16
Bipolar Offset
(Note 3) -
±0.25 ±1
-
±0.5
±2 LSB16
Bipolar Offset Drift
(Note 4) -
±0.25
-
- ±0.5 - LSB16
Noise (Referred to Output)
- 0.16 -
- 0.16 - LSB-
rms16
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 CS5505/6/7/8’s source impedance requirements. For more information refer to the
text section Analog Input Impedance Considerations.
2. Specifications guaranteed by design, characterization and/or test.
3. Applies after calibration at the temperature of interest.
4. Total drift over the specified temperature range since calibration at power-up at 25°C.
Recalibration at any temperature will remove these errors.
Unipolar Mode
Bipolar Mode
mV
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
VREF = 2.5V
CS5505/7; 16-Bit Unit Conversion Factors
* Refer to the Specification Definitions immediately following the Pin Description Section.
Specifications are subject to change without notice.
2
DS59F4


Part Number CS5508
Description 16-Bit and 20-Bit A/D Converters
Maker Crystal
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CS5508 Datasheet PDF






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