CS5490 datasheet(11/57 Pages) CIRRUS

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CS5490

DS982F3

Notes:

All outputs unloaded. All inputs CMOS level.

Temperature accuracy measured after calibration is performed.

Measurement method for PSRR: VDDA = +3.3V, a 150mV (zero-to-peak) (60Hz) sinewave is imposed onto the +3.3V DC supply

voltage at the VDDA pin. The “+” and “-” input pins of both input channels are shorted to GNDA. The CS5490 is then commanded

to continuous conversion acquisition mode, and digital output data is collected for the channel under test. The (zero-to-peak) value

of the digital sinusoidal output signal is determined, and this value is converted into the (zero-to-peak) value of the sinusoidal

voltage (measured in mV) that would need to be applied at the channel’s inputs, in order to cause the same digital sinusoidal

output. This voltage is then defined as Veq PSRR is (in dB):

VOLTAGE REFERENCE

Notes:

It is strongly recommended that no connection other than the required filter capacitor be made to VREF±.

The voltage at VREF± is measured across the temperature range. From these measurements the following formula is used to

calculate the VREF temperature coefficient:

10.

Specified at maximum recommended output of 1µA sourcing. VREF is a very sensitive signal, the output of the VREF circuit has

a very high output impedance so that the 0.1µF reference capacitor provides attenuation even to low frequency noise, such as

50Hz noise on the VREF output. As such VREF intended for the CS5490 only and should not be connected to any external

circuitry. The output impedance is sufficiently high that standard digital multi-meters can significantly load this voltage. The

accuracy of the metrology IC can not be guaranteed when a multimeter or any component other than the 0.1µF capacitor is

attached to VREF. If it is desired to measure VREF for any reason other than a very course indicator of VREF functionality, Cirrus

recommends a very high input impedance multimeter such as the Keithley Model 2000 Digital Multimeter be used, but still cannot

guarantee the accuracy of the metrology with this meter connected to VREF.

Power Supplies

Power Supply Currents (Active State)

IA+ (VDDA = +3.3V)

PSCA

3.9

Power Consumption

(Note 5)

Active State (VDDA = +3.3V)

Stand-by State

12.9

4.5

Parameter

Symbol

Min

Typ

Max

Unit

Reference

(Note 8)

Output Voltage

VREF

+2.3

+2.4

+2.5

Temperature Coefficient

(Note 9)

TCVREF

-25

ppm/°C

Load Regulation

(Note 10)

VR

-30

Parameter

Symbol

Min

Typ

Max

Unit

PSRR

150

Veq

-----------

log



TCVREF

VREFMAX VREFMIN

–

VREFAVG

------------------------------------------------------------





TAMAX TAMIN

–

----------------------------------------------



 1.0 106





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