cxa1597m Sony Electronics, cxa1597m Datasheet - Page 11

• Manufacturer Part Number: cxa1597m
• Description: Recording Equalizer Amplifier For Stereo Cassette Decks
• Manufacturer: Sony Electronics

2. Low frequency boost
Also, the relationship of time constants f
the "voltage
"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
certain ratios to the internal resistance; therefore, the frequency response does not depend on the internal
resistance.
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.
G
From the above, items f
f
f
A
A
1
2
1
2
BOOST
=
=
=
=
R
2 • C
2 • C
R
4
4
R
(s) =
+ R
• R
7
1
1
1
7
7
Low frequency boost
current converter circuits" and the IC's internal capacitance connected to the output of each
• R
• (R
+ R
s • C
R
8
4
7
7
• R
• R
• R
Fig. 2. Conceptual diagram of CXA1597 frequency response
1
R
• (R
7
8
8
4
+ R
+ R
+ R
1
, f
4
2
• R
7
8
7
, A
• R
• R
s • C
7
1
, and A
+ R
8
4
G
+ R
1
=
L
7
• R
• R
8
M
R
• R
7
2
, f
4
8
• R
in Fig. 3 are transformed into the following:
R
R
P
+
+ R
4
)
7
7
and Q is configured by the product of the current obtained with
8
R
R
+ R
• R
+ R
f
8
7
7
M
=
+ R
• R
• R
8
8
7
2 • C
– 11 –
4
Frequency [Hz]
8
8
) + (R
1
4
•
+ R
(
G
R
R
H
1
7
4
4
)
+ R
• R
(s = j )
7
7
+ R
8
)
Q
G
f
P
current conversion become
P
CXA1597M/P