HA12228F/HA12229F
The Tolerances of External Components for Dolby NR (Only HA12228F)
For adequate Dolby NR tracking response, take external components shown below.
Also, leak is small capacity, and please employ a good quality object.
BIAS
5
R10
18kΩ
±2%
C14
0.1µF
±10%
23
DET(R)
HA12228F
DET(L)
8
C7
0.1µF
±10%
Figure 6 Tolerance of External Components
Countermeasure of a Cellular Phone Noise
This IC have reinforced a cellular phone noise countermeasure, to show it hereinafter.
However, it is presumed that this effect change it greatly, by a mount set.
Please sufficiently examine an arrangement of positions, shield method, wiring pattern, in order to oftain a
maximum effect.
A high terminal of a noise sensitivity of this IC is FIN, RIN, NFI and RIP.
ref
HA12228F
1000 p
SG
FIN
180
NFI
+
−
270 k
13 k
M-OUT EQOUT
0.01µ
AC VM
wait DIN/AUDIO
Note: Test condition
• Use for SG by cellular radio for an evaluation use.
• SG output mode
PDC system, burst
UP Tch (Transmission mode on the side of a movement machine)
• To evaluate a capacitor of 1000 pF as connecting with it directly.
• About EQOUT output, what you measure through DIN/AUDIO filter.
Figure 7 Test Circuit
Rev.2, Dec. 2000, page 15 of 51