MB86434 Datasheet, PDF (19/38 Pages) Fujitsu Component Limited. – 5V Single Power Supply Audio Interface Unit (AIU)

MB86434
3. Analog Output
The MB86434 has a total of four analog output circuits, including the three speaker drive circuits (receiver, earphone
and tone) and the accessory output.
(1) Speaker Drive Amp
The speaker drive amps include two circuits (receiver and tone) with BTL output and one system (earphone) with
single output. Because the speaker amp requires relatively high levels of power, it is connected to speaker selection
switches (sw6-sw9) for power-down mode selection.
Two systems (receiver and earphone) have fixed gain levels, while the other system (tone) allows gain adjustment
by means of external resistors.
In addition, the tone speaker amp is able to use the 200 mW large-current power circuit
Table Speaker Drive Amp Output Standards
Parameter
Receiver speaker amps
(EAR, XEAR)
Output type
Load resistance *¹
Load resistance *²
Load capacity *²
Final stage gain
Maximum output power
BTL
32 Ω (typ)
2.8 kΩ (typ)
70 nF
6.0 dB
(between EAR-XEAR)
10 mW (min)
*1: Dynamic-type speaker
*2: Piezoelectric-ceramic type speaker
Earphone speaker amp
(JEAR)
Single
32 Ω (typ)
2.8 kΩ (typ)
70 nF
0.0 dB/–6.0 dB
(JEAR)
5 mW (min)
Tone speaker amps
(TONE, XTONE)
BTL
32 Ω (typ)
2.8 kW (typ)
70 nF
–5 to 20 dB
(between TONE-XTONE)
200 mW (min)
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