TEA0677T View Datasheet(PDF) - Philips Electronics

Part Name

Description

Manufacturer

TEA0677T

Dual pre-amplifier and equalizer for reverse tape decks

Philips Electronics 

Philips Semiconductors

Dual pre-amplifier and equalizer for

reverse tape decks

Product specification

TEA0677T

PINNING

SYMBOL PIN

DESCRIPTION

OUTA

1 output channel A

n.c.

2 not connected

n.c.

3 not connected

n.c.

4 not connected

n.c.

5 not connected

n.c.

6 not connected

EQA

7 equalizing output channel A

EQFA

8 equalizing input channel A

VCC

INA1

9 supply voltage

10 input channel A1 (forward or

reverse)

VREF

INA2

11 reference voltage

12 input channel A2 (reverse or

forward)

INB2

13 input channel B2 (reverse or

forward)

HS

14 head switch input

INB1

15 input channel B1 (forward or

reverse)

GND

16 ground

EQFB

17 equalizing input channel B

EQB

18 equalizing output channel B

EQS

19 equalizing switch input

n.c.

20 not connected

ACUR

21 auxiliary current

n.c.

22 not connected

n.c.

23 not connected

OUTB

24 output channel B

Fig.2 Pin configuration.

FUNCTIONAL DESCRIPTION

Head switching is achieved when pin 14 (HS) is

connected to GND via a 27 kΩ resistor (inputs INA2, INB2

active), or left open-circuit (inputs INA1, INB1 active).

The 10 µF capacitor at pin 14 sets the time constant for

smooth switching.

Time constant switching for equalization

(70 µs/120 µs) is achieved when pin 19 (EQS) is

connected to ground via an 18 kΩ resistor (120µs) or left

open-circuit (70 µs).

August 1993

4

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