HA12134A Datasheet, PDF (17/27 Pages) Hitachi Semiconductor – Dolby B-Type Noise Reduction System

HA12135A
–10
HA12134A, HA12135A, HA12136A
–20
–30
–40
NR–OFF
–50
NR–ON
100 200 400
1k 2k 4k
Frequency [Hz]
10 k 20 k
Figure 19 PB Mode Ripple Rejection Ratio vs. Frequency
10
HA12135A
3
1.0
VCC= 12 V
0.3
0.1
10 kHz
0.03
100 Hz
1 kHz
0.01
–20 –15 –10 –5
0
5 10 15 20
Vout [dB]
Figure 20 REC NR-OFF Total Harmonic Distortion vs. Output Level
Rev.3, Jun. 1999, page 17 of 27