CXA2500M データシートの表示（PDF） - Sony Semiconductor

部品番号

コンポーネント説明

メーカー

CXA2500M

Dual REC/PB Preamplifier

Sony Semiconductor 

CXA2500M/N

2. PB Mode:

To reduce the PB amplifier DC output offset, it is recommended that 39kΩ resistor be connected as shown

in the Application Circuit. However, too low this resistor value may affect the low frequency portion of the

PB frequency response. The inter-relationship of the RC values in the playback equalization network is as

shown below:

IN

+

PB

–

R1

330k

R3

22k

R5

330

C1

0.01µ

R2

15k

REF

C2

R4

33µ

39k

55 GV (dB)

50

45

40

35

30

25

CXA2500

TAPE PB: GV, THD vs f

VO = –15dBm

VCC = 2V

NORMAL

G1

G2

METAL

10

100

1kf1 f2

10k

100k

f [Hz]

During Normal PB mode,

Gain G1 = 20 log (R2 + R5)/R5

3dB cut-off frequency, f1 = 1/(2 × 3.1416 × C1 × R2)

During Metal PB mode,

Gain G2 = 20 log (R2//R3 + R5)/R5

3dB cut-off frequency, f2 = 1/(2 × 3.1416 × C1 × R2//R3)

3. Use of RC at Tape/Tuner and PB/REC pins:

The purpose of the external RC components at the switch inputs is to create an internal mute pulse so as to

mute the REC OUT momentally during the switching operation. By doing so, the switching click noise that

may appear at REC OUT can be reduced. The selection of the RC values affects the duration of the mute

pulse. It is recommended to use resistor of 2.2kΩ and below at Tape/Tuner pin, i.e Pin 12. These RC

components may be removed if such internal pop noise countermeasure is not required.

– 10 –

Share Link: