HA12211NT Renesas Electronics Corporation., HA12211NT Datasheet - Page 11

• Manufacturer Part Number: HA12211NT
• Description: Audio Signal Processor For Cassette Deck Deck 1 Chip
• Manufacturer: Renesas Electronics Corporation.

Level Diagram
It is the target that total play back output level is adjusted to 300mV; Dolby level, which the PB system
gain in all is included of external amplifier’s (Dolby IC etc.) as follows figure 3. Though A head
adjustment is independent of B, select the value of R9, R18 adequately.
Regarding REC-EQ adjust the gain in front of input to this IC.
The level diagram at 1kHz is shown by figure 4.
Note: 1. R1 needs the value more than 1kHz.
2. Depending on the employed REC/PB head and test tape characteristics, there is rare case that
the REC-EQ frequency characteristics of this IC can not be matched to the required
characteristics because of built-in resistors which determined the REC-EQ parameters in this
case, please inquire the responsible agent because of the adjustment of built-in resistors is
necessary.
(Dolby Level)
Figure 3 PB Level Diagram (Normal Speed, Normal Tape, 1kHz)
300mV
23.9mV
11.3mV
0.6mV
25.5dB
10kΩ
0 to 20.8dB
100kΩ VR
+
–
100kΩ
VR = 11kΩ
Dolby IC
20dB
HA12134A
Rev.2, Jun. 1997, page 9 of 34
HA12211NT