HA12134A Datasheet, PDF (9/27 Pages) Hitachi Semiconductor – Dolby B-Type Noise Reduction System

HA12134A, HA12135A, HA12136A
3.0
HA12134A/5A/6A
2.5
2.0
NR-ON
1.5
1.0
NR-OFF
0.5
0
4 6 8 10 12 14 16 18
Supply voltage Vcc [V]
Figure 3 NR-ON/OFF Control Voltage vs. Supply Voltage
12
HA12136A
10
8
6
12 V
16 V
–40 dB
9.5 V
–30 dB
4
2
0
100 200
–20 dB
–10 dB
0 dB
500 1 k 2 k 5 k 10 k 20 k 50 k 100 k
Frequency [Hz]
Figure 4 Encode Boost vs. Frequency
Rev.3, Jun. 1999, page 9 of 27