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CXA1598

Recording Equalizer Amplifier for Stereo Cassette Decks

Sony Semiconductor 

CXA1598M/S

3. Recording mute function

The CXA1598 contains a built-in recording mute circuit which varies the recording equalizer amplifier gain

according to the magnitude of the DC voltage applied to the REC MUTE pin just like an electronic volume

control. Also, any desired soft mute or fader can be freely set depending on momentary changes in the DC

voltage applied to the REC MUTE pin. Fig. 3 illustrates the recording mute waveforms.

Fig. 3. Recording mute waveform

4. Recording level calibration function

The CXA1598 allows the recording level to be finely adjusted with a DC voltage. The recording equalizer

amplifier gain can be varied by approximately ±5dB simply by applying a DC voltage to the REC CAL pin.

When not using the recording level calibration function, simply leave the REC CAL pin open, and the REC

CAL pin is matched to the internal reference voltage (2.5V), with the recording level set for the standard

output gain.

5. Medium frequency equalizer amplifier calibration function

The CXA1598 allows the medium frequency equalizer amplifier characteristics to be finely adjusted with a DC

voltage. By simply applying a DC voltage to the GH CAL pin, the medium frequency equalizer amplifier gain

can be varied by approximately ±4dB. When not using this calibration function, simply leave the GH CAL pin

open, and the GH CAL pin is matched to the internal reference voltage (2.5V), with the medium frequency

equalizer amplifier characteristics set for the standard output gain.

6. High frequency equalizer amplifier calibration function

The CXA1598 allows the high frequency equalizer amplifier characteristics to be finely adjusted with a DC

voltage. By simply applying a DC voltage to the GP CAL pin, the high frequency equalizer amplifier gain can

be varied by approximately ±4dB. Also, when not using this calibration function, simply leave the GP CAL pin

open, and the GP CAL pin is matched to the internal reference voltage (2.5V), with the high frequency

equalizer amplifier characteristics set for the standard output gain.

7. fp peaking frequency calibration function

The CXA1598 allows the fp peaking frequency to be finely adjusted with a DC voltage. By simply applying a

DC voltage to the FP CAL pin, the fp peaking frequency can be varied by approximately 46% to 200%. Also,

when not using this calibration function, simply leave the FP CAL pin open, and the FP CAL pin is matched to

the internal reference voltage (2.5V), with the fp peaking frequency response set for the standard fp peaking

frequency.

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