CS5461A datasheet(8/44 Pages) CIRRUS

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CS5461A

DS661F2

ANALOG CHARACTERISTICS (Continued)

Applies when the HPF option is enabled.

Applies before system calibration.

All outputs unloaded. All inputs CMOS level.

Measurement method for PSRR: VREFIN tied to VREFOUT, VA+ = VD+ = 5 V, a 150 mV (zero-to-peak) (60 Hz)

sinewave is imposed onto the +5 V DC supply voltage at VA+ and VD+ pins. The “+” and “-” input pins of both input

channels are shorted to AGND. Then the CS5461A is 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 then (in dB):

When voltage level on PFMON is sagging, and LSD bit is at 0, the voltage at which LSD bit is set to 1.

If the LSD bit has been set to 1 (because PFMON voltage fell below PMLO), this is the voltage level on PFMON at

which the LSD bit can be permanently reset back to 0.

VOLTAGE REFERENCE

Notes:

The voltage at VREFOUT is measured across the temperature range. From these measurements the following

formula is used to calculate the VREFOUT Temperature Coefficient:.

Specified at maximum recommended output of 1 µA, source or sink.

Parameter

Symbol

Min

Typ

Max

Unit

Temperature Channel

Temperature Accuracy

±5

°C

Power Supplies

Power Supply Currents (Active State)

IA+

ID+ (VA+ = VD+ = 5 V)

ID+ (VA+ = 5 V, VD+ = 3.3 V)

PSCA

PSCD

1.1

2.9

1.7

Power Consumption

Active State (VA+ = VD+ = 5 V)

(Note 3)

Active State (VA+ = 5 V, VD+ = 3.3 V)

Stand-By State

Sleep State

16.5

µW

Power Supply Rejection Ratio

(DC, 50 and 60 Hz)

(Note 4)

Voltage Channel

Current Channel

PSRR

PFMON Low-voltage Trigger Threshold

(Note 5)

PMLO

2.3

2.45

PFMON High-voltage Power-On Trip Point

(Note 6)

PMHI

2.55

2.7

Parameter

Symbol

Min

Typ

Max

Unit

Reference Output

Output Voltage

VREFOUT

+2.4

+2.5

+2.6

Temperature Coefficient

(Note 7)

TCVREF

ppm/°C

Load Regulation

(Note 8)

∆VR

-6

Reference Input

Input Voltage Range

VREFIN

+2.4

+2.5

+2.6

Input Capacitance

Input CVF Current

PSRR

150

----------

⎩⎭

⎨⎬

⎧⎫

log

⋅

( V REF O UT MA X - VR EF O U T MIN )

VR EF O U T AVG

(

MA X

- T

MI N

(

1. 0 x 1 0

(

VR EF

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