CS5501-SD datasheet(51/54 Pages) CIRRUS

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Analog Input: Overrange Precautions

In normal operation the value of the reference

voltage determines the range of the analog input

signal. Under abnormal conditions the analog sig-

nal can extend to be equal to the VA+ and VA-

supply voltages. In the event the signal exceeds

these supply voltages the input current should be

limited to

± 10 mA as the analog input of the chip

is internally diode clamped to both supplies. Ex-

cess current into the pin can damage the device.

On the evaluation board, resistor R16 (see Figure

6) does provide some current limiting in the event

of an overrange signal which exceeds the supply

voltage.

CS5501/

VA+

VD+

VREF

AGND

AIN

GND

VIN

TP14

TP11

TP13

+5V

-5V

GND

V+

TP15

VA-

VD-

TP12

V-

TP16

AIN

DGND

0.1

µF

0.1

µF

R10

2.4

C16

0.1

µF

C19

µF

0.1

µF0.1 µF

R16

200

C21

0.0047

µF

X7R

LT1019-2.5

1 M

50 k

C18

µF

C10

0.1

µF

C20

µF

C17

µF

6.8

VOUT

TRIM

CS5503

Figure 6. Voltage Reference / Analog Input

CDB5501/CDB5503

DS31DB3

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