HA12229F datasheet(13/49 Pages) RENESAS

13 / 49 page

HA12228F/HA12229F

Rev.2.00 Jun 15, 2005 page 13 of 48

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.

DET(R)

HA12228F

R10

18k

Ω

±2%

BIAS

C14

0.1

µF

±10%

0.1

µF

±10%

DET(L)

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.

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.

Note:

ref

EQOUT

−

HA12228F

NFI

FIN

1000 p

AC VM

wait DIN/AUDIO

0.01

M-OUT

180

270 k

13 k

Figure 7 Test Circuit

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