CXA1597P 查看數據表（PDF） - Sony Semiconductor

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CXA1597P

Recording Equalizer Amplifier for Stereo Cassette Decks

Sony Semiconductor 

CXA1597M/P

Also, the relationship of time constants fM, fP and Q is configured by the product of the current obtained with

the "voltage → current converter circuits" and the IC's internal capacitance connected to the output of each

"multiplier circuit". By using the currents determined by the CXA1597 external resistance which are not

dependent on the internal resistance for control, the coefficients for voltage → current conversion become

certain ratios to the internal resistance; therefore, the frequency response does not depend on the internal

resistance.

GP

Low frequency boost

GL

Q

GH

fM

fP

Frequency [Hz]

Fig. 2. Conceptual diagram of CXA1597 frequency response

2. Low frequency boost

The CXA1597 implements low frequency boost simply by attaching an external capacitor. As shown in Fig. 1,

this IC contains a resistance-based attenuation circuit after the input amplifier, with one of the resistors

connected to the BOOST pins (Pins 6 and 11). When a capacitor is connected to these BOOST pins (Pins 6

and 11), the following transfer function is obtained.

GBOOST (s) =

s • C1 • R7 • R8 + R7

(s = jω)

s • C1 • (R4 • R7 + R7 • R8 + R8 • R4) + (R4 + R7)

From the above, items f1, f2, A1, and A2 in Fig. 3 are transformed into the following:

( ) f1 =

R4 + R7

2π • C1 • (R4 • R7 + R7 • R8 + R8 • R4)

=

2π • C1 •

1

R4 • R7 + R8

R4 + R7

f2 =

1

2π • C1 • R8

A1

=

R7

R4 + R7

A2 =

R7 • R8

R4 • R7 + R7 • R8 + R8 • R4

=

R7 • R8

R7 + R8

R4

+

R7

R7

•

+

R8

R8

– 11 –

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