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CS5509 Datasheet Preview

CS5509 Datasheet

16-Bit A/D Converter

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CS5509
Single Supply, 16-Bit A/D Converter
Features
l Delta-Sigma A/D Converter
- 16-bit No Missing Codes
- Linearity Error: ±0.0015%FS
l Differential Input
- Pin Selectable Unipolar/Bipolar Ranges
- Common Mode Rejection
105 dB @ dc
120 dB @ 50, 60 Hz
l Either 5 V or 3.3 V Digital Interface
l On-chip Self-Calibration Circuitry
l Output Update Rates up to 200/second
l Ultra Low Power: 1.7 mW
Description
The CS5509 is a single supply, 16-bit, serial-output
CMOS A/D converter. The CS5509 uses charge-bal-
anced (delta-sigma) techniques to provide a low cost,
high resolution measurement at output word rates up to
200 samples per second.
The on-chip digital filter offers superior line rejection at
50 Hz and 60 Hz when the device is operated from a
32.768 kHz clock (output word rate = 20 Hz.).
The CS5509 has on-chip self-calibration circuitry which
can be initiated at any time or temperature to ensure
minimum offset and full-scale errors.
Low power, high resolution and small package size
make the CS5509 an ideal solution for loop-powered
transmitters, panel meters, weigh scales and battery
powered instruments.
ORDERING INFORMATION
CS5509-AP -40° to +85° C 16-pin Plastic DIP
CS5509-AS -40° to +85° C 16-pin SOIC
I
VREF+
9
VREF-
10
7
AIN+
8
AIN-
Differential
4th-Order
Delta-Sigma
Modulator
VA+ DGND VD+
11 12 13
Digital
Filter
Serial
Interface
Logic
1
CS
14 SCLK
15
SDATA
16
DRDY
Calibration SRAM
Calibration µC
OSC
2
CONV
45
XIN XOUT
3 CAL
6 BP/UP
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
DS125F1
1




Crystal

CS5509 Datasheet Preview

CS5509 Datasheet

16-Bit A/D Converter

No Preview Available !

CS5509
ANALOG CHARACTERISTICS (TA = 25°C; VA+ = 5V ± 10%; VD+ = 3.3V ± 5%; VREF+ = 2.5V,
VREF- = 0V; fCLK = 330kHz; Bipolar Mode; Rsource = 50with a 10nF to GND at AIN; AIN- = 2.5V; unless
otherwise specified.) (Notes 1, 2)
Accuracy
Parameter*
Min Typ Max Units
Linearity Error
fCLK = 32.768 kHz
fCLK = 165 kHz
fCLK = 247.5 kHz
fCLK = 330 kHz
Differential Nonlinearity
Full Scale Error
Full Scale Drift
Unipolar Offset
Unipolar Offset Drift
Bipolar Offset
Bipolar Offset Drift
Noise (Referred to Output)
Analog Input
(Note 3)
(Note 4)
(Note 3)
(Note 4)
(Note 3)
(Note 4)
-
-
-
-
-
-
-
-
-
-
-
-
0.0015
0.0015
0.0015
0.005
±0.25
±0.25
±0.5
±0.5
±0.5
±0.25
±0.25
0.16
0.003
0.003
0.003
0.0125
±0.5
±2
-
±2
-
±1
-
-
±%FS
±%FS
±%FS
±%FS
LSB
LSB
LSB
LSB
LSB
LSB
LSB
LSBrms
Analog Input Range:
Common Mode Rejection:
fCLK = 32.768kHz
Input Capacitance
Unipolar
Bipolar
dc
50,60 Hz
(Note 5, 6)
(Note 2)
-
-
-
120
-
0 to +2.5
±2.5
105
-
15
-
-
-
-
-
Volts
Volts
dB
dB
pF
DC Bias Current
(Note 1)
-
5
- nA
Power Supplies
DC Power Supply Currents:
Power Dissipation
ITotal
IAnalog
IDigital
(Note 7)
-
-
-
-
360 450 µA
300 - µA
60 - µA
1.7 2.25 mW
Power Supply Rejection
- 80 - dB
Notes:
1. Both source resistance and shunt capacitance are critical in determining the CS5509’s source
impedance requirements. 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.
5. The input is differential. Therefore, GND Signal + Common Mode Voltage VA+.
6. The CS5509 can accept input voltages up to the VA+ analog supply. In unipolar mode the CS5509
will output all 1’s if the dc input magnitude ((AIN+)-(AIN-)) exceeds ((VREF+)-(VREF-)) and will
output all 0’s if the input becomes more negative than 0 Volts. In bipolar mode the CS5509 will
output all 1’s if the dc input magnitude ((AIN+)-(AIN-)) exceeds ((VREF+)-(VREF-)) and will output all
0’s if the input becomes more negative in magnitude than -((VREF+)-(VREF-)).
7. All outputs unloaded. All inputs CMOS levels.
* Refer to the Specification Definitions immediately following the Pin Description Section.
Specifications are subject to change without notice.
2
DS125F1


Part Number CS5509
Description 16-Bit A/D Converter
Maker Crystal
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CS5509 Datasheet PDF






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