HA12228F データシートの表示（PDF） - Renesas Electronics

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HA12228F

Audio Signal Processor for Car Deck (Decode only Dolby B-type NR* with PB Amp.)

Renesas Electronics 

HA12228F/HA12229F

Functional Description

Power Supply Range

HA12228F/HA12229F are provided with three line output level, which will permit on optimum overload margin for

power supply conditions. And these are designed to operate on single supply only.

Table 1 Supply Voltage Range

Product

Single Supply

HA12228F

6.5 V to 12.0 V

HA12229F

Note: The lower limit of supply voltage depends on the line output reference level.

The minimum value of the overload margin is specified as 12 dB by Dolby Laboratories.

Reference Voltage

These devices provide the reference voltage of half the supply voltage that is the signal grounds. As the peculiarity of

these devices, the capacitor for the ripple filter is very small about 1/100 compared with their usual value. The block

diagram is shown as figure 1.

VCC

15

26

36

+

GND

+

Rch

−

Dolby NR circuit

+

Lch

−

Dolby NR circuit

3 Vref4

28 Vref3

38 Vref2

+

−

32 Vref1

Lch equalizer

Rch equalizer

+

−

MS block

: Internal reference voltage

Figure 1a The HA12228F Block Diagram of Reference Supply Voltage

VCC

3 Vref4

15

+

−

Line Amp. circuit

28 Vref3

26

36

+

GND

38 Vref2

+

−

32 Vref1

Lch equalizer

Rch equalizer

+

−

MS block

: Internal reference voltage

Figure 1b The HA12229F Block Diagram of Reference Supply Voltage

Rev.2.00 Jun 15, 2005 page 8 of 48

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