HA12167FB Datasheet, PDF (26/73 Pages) Hitachi Semiconductor – Audio Signal Processor for Cassette Deck (Deck 1 Chip)

HA12167FB/HA12169FB
BIAS DAC
The full-scale of DAC is computed by the formula mentioned below.
[ ] V₂₉
=
2.4
R_{14 to 16}
× R₁₀
V
[ ] V₃₂
=
2.4
R_{14 to 16}
× R₁₃
V
R₁₄: Normal Tape (pin 35)
R₁₅: Metal Tape (pin 36)
R₁₆: Chrome Tape (pin 37)
The maximum source current of DAC output (pin 29, 32) is 2 mA. Therefor the Bias-osc is drived through
external transisitor of emitter-follower.
Level Meter
The coupling capacitor of LMIN pin (9 pin and 52 pin).
For these capacitors, please employ a small object of the leak.
Rev.3, Jun. 1997, page 26 of 73