BA1701 Rohm, BA1701 Datasheet

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BA1701

Manufacturer Part Number
BA1701
Description
VSC system processor IC
Manufacturer
Rohm
Datasheet

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The BA1701 is a monolithic audio-compression system controller IC that uses VSC .
When used in combination with an analog delay circuit and low-pass filter, it can replay recorded audio at 1 to 2.5 times
the recording speed, without altering the pitch.
FApplications
Audio compression systems for tape-based answering machines and learning aids
FFeatures
1) Wide operating voltage range (4.5V to 14V).
2) Built-in two-phase sweep oscillator that can directly
FAbsolute maximum ratings (Ta = 25_C)
FRecommended operating conditions (Ta = 25_C)
VSC system processor IC
BA1701
VSC is a trademark of The Variable Speech Control Company. This product is manufactured under licence from VSC
Ltd. for use in VSC systems.
Audio ICs
drive BBD.
3) Built-in motor controller is synchronized with the au-
4) Built-in voltage regulator.
dio compression ratio.
861

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BA1701 Summary of contents

Page 1

... Audio ICs VSC system processor IC BA1701 The BA1701 is a monolithic audio-compression system controller IC that uses VSC . When used in combination with an analog delay circuit and low-pass filter, it can replay recorded audio 2.5 times the recording speed, without altering the pitch. FApplications Audio compression systems for tape-based answering machines and learning aids FFeatures 1) Wide operating voltage range (4 ...

Page 2

... Audio ICs FBlock diagram FElectrical characteristics (unless otherwise noted 25_C, V 862 = 6V 1kHz, and P-P BA1701 ...

Page 3

... Audio ICs FMeasurement circuit BA1701 863 ...

Page 4

... Audio ICs FApplication example 864 BA1701 ...

Page 5

... By expanding this using an analog delay cir- cuit, a compressed audio signal with the same pitch as Fig. 3). The BA1701 has a built-in motor driver control circuit that is synchronized with the pitch control that allows the sys- tem to be built with just one pitch control potentiometer (see Fig ...

Page 6

... Audio ICs FApplication board patterns (solder side) FApplication board component layout (solder side) 866 BA1701 ...

Page 7

... F), and the BBD clock time constant ca- 17 pacitor (0.0047 F). (2) If the AF output pin (pin 8) has a capacitive load, you must take precautions to ensure that the BA1701 AF am- plifier does not oscillate. We recommend that you insert R (about 10k ) in the signal output line. 19 ...

Page 8

... Audio ICs 868 BA1701 ...

Page 9

... Audio ICs FExternal dimensions (Units: mm) BA1701 869 ...

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