cxa1597m Sony Electronics, cxa1597m Datasheet - Page 17

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

5. Recording level calibration
6. High frequency calibration
7. Monolithic filter (the resistance connected to the IREF pin)
The CXA1597 allows the recording level to be finely adjusted with a DC voltage as described in Description
of Operation. Therefore, the recording level can be varied by approximately ±6dB simply by applying DC
voltages of 0 to 5V (for positive/negative dual power supplies) to the REC CAL pin (Pin 14).
The table below shows the input range regulation of control voltages with the power supplies used.
The CXA1597 allows the high frequency equalizer amplifier characteristics to be finely adjusted with a DC
voltage as described in Description of Operation. Therefore, the recording level in high frequencies (peak)
can be varied by approximately ±4dB simply by applying DC voltages of 0 to 5V (for positive/negative dual
power supplies) to the G
The table below shows the input range regulation of control voltages with the power supplies used.
To increase the accuracy of the frequency response of its internal monolithic filter, the CXA1597 entrusts the
control current that determines the filter time constant to an external resistance. Specifically, this resistance
is the 27k
recording equalizer amplifier frequency response is determined by the resistance connected to the IREF pin.
Therefore, the resistor used for this purpose must be free of unevenness and have excellent temperature
characteristics (e.g., a metallic film resistor).
Also note that the recording equalizer amplifier frequency response can be shifted as desired by altering the
value of the resistance connected to the IREF pin. For example, when the resistance value is reduced, the
frequency response is shifted to the high-frequency side, and when the resistance value is increased, the
frequency response is shifted to the low-frequency side.
1
2
3
4
Although the above range of voltages can be input to the control pin, the controllable input voltage range
is as follows:
2.5V < Vup
DGND
Control voltages for this IC are referenced to the DGND pin (Pin 3).
Also note that when not using this recording calibration function, simply leave the REC CAL pin (Pin 14)
open, so that the voltage on the REC CAL pin is matched to the internal reference voltage (2.5V), with
the recording level set for the standard gain.
Although the above range of voltages can be input to the control pin, the controllable input voltage range
is as follows:
2.5V < Vup
DGND
Control voltages for this IC are referenced to the DGND pin (Pin 3).
Also note that when not using this high frequency calibration function, simply leave the G
16) open, so that the voltage on the G
the high frequency equalizer amplifier characteristics set for the standard gain.
Positive/negative dual power supplies
Positive/negative dual power supplies
Vdown < 2.5V
Vdown < 2.5V
Single power supply
Single power supply
external resistor connected to the IREF pin (Pin 12). This means that the accuracy of the
5.0V
5.0V
P
CAL pin (Pin 16).
P
CAL pin is matched to the internal reference voltage (2.5V), with
2.5V to V
2.5V to V
2.5V to V
2.5V to V
– 17 –
Up
Up
CC
CC
CC
CC
2.5V
2.5V
2.5V
2.5V
Typ.
Typ.
DGND to 2.5V
DGND to 2.5V
DGND to 2.5V
DGND to 2.5V
Down
P
Down
CAL pin (Pin
CXA1597M/P
1
3
,
,
2
4