ISD5216 Datasheet, PDF (40/75 Pages) Winbond – 8 to 16 minutes voice record/playback device with integrated codec

ISD5216
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 V_CCA 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 I²C interface) up to 9 dB.
0TLP Input V_P-P(2)
0.694
0.491
0.347
0.245
Gain Setting
00
01
10
11
Gain ⁽¹⁾ (dB)
0
3
6
9
Gain ⁽¹⁾
1.00
1.41
2.00
2.82
Array In/Out V_P-P
0.694
0.694
0.694
0.694
Speaker Out VP-
(3)
P
0.694
0.694
0.694
0.694
1. Gain from AUX IN to ARRAY IN
2. 0TLP Input is the reference Transmission Level Point that is used for testing. This level is typically 3 dB
below clipping
3. Differential
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