TK10651 Просмотр технического описания (PDF) - Toko America Inc

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TK10651

LOW VOLTAGE COMPANDOR

Toko America Inc  

TK10651

APPLICATION INFORMATION (CONT.)

RECTIFIER

COMPRESSOR DATA INPUT

The rectifier's smoothing capacitor pins (6 & 18), determine

the smoothing characteristics and the time constants of the

compressor and the expander. The time constant is deter-

mined by the external capacitor value and the internal 10

kΩ resistance.

RECTIFIER

10 k

TO GAIN CELL

An inverting amplifier is used at the DATA input. The

internal input resistors are 100 kΩ, and the DC bias (VREF)

is about 1.5 V. The maximum load at the output pin is 10 kΩ.

100 k

FROM COMP

100 k

+

-

100 k

TO VREF

DATA IN 4

COMP OUT

3

COMPRESSOR SUMMING AMPLIFIER

The compressor summing amplifier (SUM AMP) must have

unity DC gain and the AC open loop gain is high. Since the

feedback resistors are internal to the device, only one

external capacitor is needed between pin 5 and GND. The

cutoff frequency is determined by the external capacitor

and the internal resistors.

BUFFER AMPLIFIER

Up to a third order LPF (for example, a splatter filter) can be

constructed using this amplifier. The maximum load at the

output pin is 10 kΩ. The non-inverting input of the amplifier

is not biased internally, therefore an external bias is needed

(for example Pin 3 Vref) whenever this pin is not direct-

coupled from the compressor output pin (pin 3).

1

C-DCFB 5

30 k

30 k

+

-

3 kHz LPF

18000 p

10 k 10 k 10 k

2

+

100 k

-

6800 p

1000 p

TO VREF

Page 10

January 2000 TOKO, Inc.

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