TEA0677 NXP Semiconductors, TEA0677 Datasheet - Page 4

• Manufacturer Part Number: TEA0677
• Description: Dual Pre-amplifier and Equalizer for Reverse tape Decks
• Manufacturer: NXP Semiconductors

Philips Semiconductors
PINNING
FUNCTIONAL DESCRIPTION
Head switching is achieved when pin 14 (HS) is
connected to GND via a 27 k resistor (inputs INA2, INB2
active), or left open-circuit (inputs INA1, INB1 active).
The 10 F capacitor at pin 14 sets the time constant for
smooth switching.
August 1993
SYMBOL
OUTA
n.c.
n.c.
n.c.
n.c.
n.c.
EQA
EQFA
V
INA1
V
INA2
INB2
HS
INB1
GND
EQFB
EQB
EQS
n.c.
ACUR
n.c.
n.c.
OUTB
CC
REF
Dual pre-amplifier and equalizer for
reverse tape decks
PIN
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
1
2
3
4
5
6
7
8
9
output channel A
not connected
not connected
not connected
not connected
not connected
equalizing output channel A
equalizing input channel A
supply voltage
input channel A1 (forward or
reverse)
reference voltage
input channel A2 (reverse or
forward)
input channel B2 (reverse or
forward)
head switch input
input channel B1 (forward or
reverse)
ground
equalizing input channel B
equalizing output channel B
equalizing switch input
not connected
auxiliary current
not connected
not connected
output channel B
DESCRIPTION
4
Time constant switching for equalization
(70 s/120 s) is achieved when pin 19 (EQS) is
connected to ground via an 18 k resistor (120 s) or left
open-circuit (70 s).
Fig.2 Pin configuration.
Product specification
TEA0677T