ISD5216PI datasheet(40/75 Pages) WINBOND

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ISD5216

- 40 -

MIC- pins compared to the situation in which the external microphone is powered up through the

power supply. It also saves current during power down.

ACAP (AGC Capacitor)

This pin provides the capacitor connection for setting the parameters of the microphone AGC circuit. It

should have a 4.7 µF capacitor connected to ground. It cannot be left floating. This is because the

capacitor is also used in the playback mode for the AutoMute circuit or when signal compression is

chosen (AMT0 is set to ONE). This circuit reduces the amount of noise present in the output during

quiet pauses. Tying this pin to ground gives maximum gain. Tying it to VCCA gives minimum gain for

the AGC amplifier, but cancels the AutoMute function. Connect the capacitor to low noise ground as

ground noise directly affects the microphone performance

SP +, SP-

(Speaker +/-)

This is the speaker differential output circuit. It is designed to drive an 8Ω speaker connected across

the speaker pins, up to a maximum of 23.5 mW RMS power. This stage has two selectable gains,

1.32 and 1.6, which can be chosen through the configuration registers. These pins are biased to ap-

proximately 1.2 VDC and, if used single-ended, must be capacitively coupled to their load. Do NOT

ground the unused pin.

AUX OUT (Auxiliary Output)

The AUX OUT is an additional audio output pin to be used, for example, to drive the speaker circuit in

a “car kit.” It drives a minimum load of 5 kΩ and up to a maximum of 1 V p-p. The AC signal is

superimposed on approximately 1.2 VDC bias and must be capacitively coupled to the load.

AUX IN (Auxiliary Input)

The AUX IN is an additional audio input to the Winbond ISD5216, such as from the microphone circuit

in a mobile phone “car kit.” This input has a nominal 694 mV p-p level at its minimum gain setting

(0 dB). (See Aux In Amplifier Gain Settings Table below). Additional gain is available in 3 dB steps

(controlled by the I

2C interface) up to 9 dB.

0TLP Input VP-P

(2)

Gain Setting

Gain

(1) (dB)

Gain

(1)

Array In/Out VP-P

Speaker Out VP-

(3)

0.694

1.00

0.694

0.491

1.41

0.694

0.347

2.00

0.694

0.245

2.82

0.694

Gain from AUX IN to ARRAY IN

0TLP Input is the reference Transmission Level Point that is used for testing. This level is typically 3 dB

below clipping

Differential

ISD5216PI Datasheet(PDF) 40 Page - Winbond

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