MB86437 Datasheet, PDF (16/35 Pages) Fujitsu Component Limited. – 3 V Single Power Supply Audio Interface Unit (AIU)

MB86437
3. Analog Output Relationships
The four analog outputs consist of three speaker drivers (for receiver, earphone, and tone) and an accessory output.
(1) Speaker driver amps
The speaker driver amps consist of one BTL output (the receiver output) and one single output (the earphone
output). Also, the sounder driver consists of one single output and the sounder output can be obtained via a transistor.
As the speaker amps have high power consumption, separate power-down control is available for each speaker amp.
Parameter
Output type
Load resistance *¹
Load capacitance *²
Maximum output power
Receiver Speaker Amp
(EAR, XEAR)
BTL
32 Ω (typ.)
0.1 µF
10 mW (min.)
Earphone Speaker Amp
(JEAR)
Single
32 Ω (typ.)
0.1 µF
5 mW (min.)
Tone Amp
(TONE)
Single
600 Ω (typ.)
*1: Dynamic speaker
*2: A capacitor is required to prevent oscillation.
• Analog output connection example
EV6
_
+
SGC
EAR
C1
Receiver speaker
Dynamic type: 32 Ω (typ)
TBO
–
+
SGC
EV7
–
+
SGC
XEAR
C1
JEAR
C2
C1
Earphone speaker
Dynamic type: 32 Ω (typ)
EV8
Sounder
EV4
EV9
SGC
–
+
SW 14
TONE
(Inside IC)
Note: Insert C1 capacitors of approximately 0.1 µF to prevent oscillation. C2 is to cut DC.
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