ISD5100 – SERIES
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. 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.
SP +, SP- (Speaker +/-)
This is the speaker differential output circuit. It is designed to drive an 8ꢀ 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 5kꢀ and up to a maximum of 1V p-p. The AC signal is
superimposed on approximately 1.2 VDC bias and must be capacitively coupled to the load.
Car Kit
AUX OUT (1 Vp-p Max)
OUT PUT
MUX
VOL
ANA IN AMP
FILTO
Speak er
SP+
SP–
2
SUM2
(OPA1, OPA0)
2
(OPS1,OPS0)
OPS1
OPS0
SOURCE
VOL
OPS1
OPA0
SPKR DRIVE
Power Down
3.6 Vp.p @150Ω
AUX OUT
0
0
1
1
0
1
0
1
0
0
1
1
0
1
0
1
Power Down
Power Down
ANA IN
FILTO
SUM2
23.5 mWatt @ 8Ω Power Down
Power Down 1 Vp.p Max @ 5KΩ
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
AIG1 AIG0 AIPD AXG1 AXG0 AXPD INS0 AOS2 AOS1 AOS 0 AOPD OPS1 OPS0 OPA1 OPA0 VLPD
CFG0
Publication Release Date: October, 2003
Revision 0.2
- 51 -
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