BA335.pdf

Audio ICs

Audio level sensor

BA335

The BA335 is a sensor amplifier which consists of three blocks : a small signal audio amplifier, a hysteresis comparator,

and a driver. Housed in a 9-pin SIP package, it is optimal for tape recorder end detection and tape mute detection.

Applications

Tape end detection

Tape mute detection

Features

Built-in comparator with stable hysteresis under

power supply voltage and temperature fluctuations.

Time delays can be created as needed with an exter-

nal CR circuit.

Built-in transistor and diode capable of driving an in-

ductive load at 600mA.

Absolute maximum ratings (Ta = 25

Internal circuit schematic

829

Audio ICs

BA335

Electrical characteristics (unless otherwise noted, Ta = 25

C and V CC = 9.0V)

Measurement circuit

830

Audio ICs

BA335

Attached components

C 1 : Input coupling capacitor. 1 to 2.2

F recommended.

C 2 : AC bypass capacitor. 0.1 to 0.47

F recommended.

R 1 , C 3 : Resistor and capacitor for setting time delay.

R 2 , C 4 : Resistor and capacitor for ripple filter.

Input characteristics

As shown in Fig. 4, V P6 and V P8 invert when the input

reaches approximately

Time delay using the hysteresis comparator is as follows.

When an input signal of

45dBm. V P8 is designed to be

able to directly drive the NPN small signal transistor at

this time. When on, V P6 is capable of accepting a maxi-

mum of 600mA of current (this will vary as shown in the

duty cycle table). A continuous ON should last for no

more than 3 seconds.

45dBm or more goes to noth-

ing ceases, the electrical potential of Pin 2 begins to fall

due to the CR circuit connected to Pin 2. The time until

the hysteresis comparator inverts is the time delay. When

deciding the values of the capacitor and resistor, select

a resistor value from 100 to 500k

831

Audio ICs

BA335

Electrical characteristic curves

External dimensions (Units: mm)

832

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