CS5505/6/7/8
CS5505/6/7/8
Very Lo Very Low Power, 16-bit & 20-bit A/D Convertersw Power, 16-Bit and 20-Bit A/D Converters
Features Description
The CS5505/6/7/8 are a family of low power CMOS A/D
lVery Low Power Consumption
converters which are ideal for measuring low-frequency
- Single supply +5 V operation: 1.7 mW
signals representing physical, chemical, and biological
- Dual supply 5 V operation: 3.2 mW
processes.
lOffers superior performance to VFCs and
The CS5507/8 have single-channel diferf ential analog
multi-slope integrating ADCs
and reference inputs while the CS5505/6 have four
lDifferential Inputs
pseudo-differential analog input channels. The
- Single-channel (CS5507/8) and Four-channel CS5505/7 have a 16-bit output word. The CS5506/8
have a 20-bit outpt wou rd.The CS5505/6/7/8 sample
(CS5505/6) pseudo-differential versions
upon command up to 100 Sps.
lEither 5 V or 3.3 V Digital Interface
The on-chip digital filter offers superior line rejection at
lLinearity Error:
50 and 60 Hz when the device is operated from a
- 0.0015% FS (16-bit CS5505/7)
32.768 kHz clock (output word rate = 20 Sps).
- 0.0007% FS (20-bit CS5506/8)
The CS5505/6/7/8 incudel on-chip self-calibration cir-
lOutput update rates up to 100 Sps
cuitry which can be initiated at any time or temperature
lFlexible Serial Port
to ensure minimum offset and full-scale errors.
lPin-Selectable Unipolar/Bipolar Ranges
The CS5505/6/7/8 serial port offers two general-purpose
modes for the driect interface to shift registers or syn-
chronous sriael ports ofnd iustry-standard
microcontrollers.
ORDERING INFORMATION
See page 30.
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Cirrus Logic, Inc.
Copyright CirrCopyright us Logic, Inc. 2009 Cirrus Logic, Inc. 1997
Crystal Semiconductor Products Division
MOCT 09AR 95
CS5505/6/7/8
CS5505/6/7/8
ANALOG CHARACTERISTICS
(T = T to T ; VA+ = 5V 10%; VA- = -5V 10%; VD+ =
A MIN MAX
3.3V 5%; VREF+ = 2.5V(external); VREF- = 0V; f = 32.768kHz; Bipolar Mode; R = 1k with a 10nF
CLK source
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 - - LSB
0.25 0.5 0.25 0.5 16
Full Scale Error (Note 3) - - LSB
0.25 2 16
0.5 2
Full Scale Drift (Note 4) - - - - LSB
0.5 2 16
Unipolar Offset (Note 3) - - LSB
0.5 2 1 4 16
Unipolar Offset Drift (Note 4) - - - - LSB
0.5 1 16
Bipolar Offset (Note 3) - - LSB
16
0.25 1 0.5 2
Bipolar Offset Drift (Note 4) - - - - LSB
0.25 0.5 16
Noise (Referred to Output) - 0.16 - - 0.16 - LSB-
rms
16
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 CS5505/6/7/8s 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 25C.
Recalibration at any temperature will remove these errors.
Unipolar Mode Bipolar Mode
mV LSBs % FS ppm FS LSBs % 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.
22 DS59FDS59F77