HA12209F データシートの表示（PDF） - Hitachi -> Renesas Electronics

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HA12209F

Audio Signal Processor for Cassette Deck (Dolby B-type NR with Recording System)

Hitachi -> Renesas Electronics 

HA12209F

External components shown figure 8 gives frequency response to take 6dB boost. And cut off frequency

can request it, by lower formulas.

Gv

f1

f2

f1 =

1

[Hz]

2π · CEX3 · (REX3 + R0)

f2 =

1

[Hz]

2π · CEX3 · REX3

R0 = REX1 · REX2 [Ω]

REX1 + REX2

f

Figure 9 Frequency Characteristic of Low-Boost

Bias Switch

This series built-in DC voltage generator for bias oscillator and its bias switches.

External resistor R8, R10 which corresponded with tape positions and bias out voltage are relater with

below.

Vbias =

R9

× (VCC – 0.7) [V]

(R10 or R8) + R9

Bias switch follows to a logic of 14 pin (B 120/70).

Note: A current that flows at bias out pin, please use it less than 5mA.

R10

BIAS (N) 26

R8

BIAS (C) 25

Vbias

R9

GND

Figure 10 External Components of Bias Block

Rev.2, Jun. 1999, page 13 of 49

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