MB86435PFV Просмотр технического описания (PDF) - Fujitsu

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MB86435PFV

3 V Single Power Supply Audio Interface Unit (AIU)

Fujitsu 

MB86435

Table 5 Microphone Amp Characteristics

Parameter

Gain measurement range

Minimum load level

Maximum output level

Characteristics (typ)

0 to 35 dB

50 kΩ

0.75 VOP

(2) Accessory Input

Direct input from the TAUD to the codec unit is possible through SW5, without passing through the microphone

amp. Care must be taken with the input signal in this case, however, because input resistance is not at high-

impedance level.

Microphone amp output may be added to the signal by using switching controls.

In this case, the result will be at the additional output level.

In addition, SW10 and SW11 may be used to transmit digital data from the TAUD to EXSD and DSCK, allowing the

sending of fax or PC data without modification.

CODEC

0dB

SW5

SW10

SGC

SW11

(Inside IC)

TAUD

EXSD

DSCK

Note: TAUD, EXSD, and DSCK contain no digital buffers. If not used,

TAUD, EXSD and DSCK should be connected to SGC.

3. Analog Output

The MB86435 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.

Table 6 Speaker Drive Amp Output Standards

Parameter

Output type

Load resistance *1

Load resistance *2

Load capacity *2

Final stage gain

Maximum output power

Receiver speaker amps

(EAR, XEAR)

BTL

32 Ω (typ)

2.8 kΩ (typ)

70 nF

–4.3 dB

(between EAR-XEAR)

6.4 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

–2.5 dB/–8.5 dB

(JEAR)

2 mW (min)

Tone speaker amps

(TONE, XTONE)

BTL

25 Ω (typ)

2.8 kW (typ)

70 nF

–5 to 20 dB

(between TONE-XTONE)

10 mW (min)

17

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