TEA0677 NXP Semiconductors, TEA0677 Datasheet - Page 6

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

Philips Semiconductors
Note to the characteristics
1. For an application with a fixed EQ time constant of 120 s the equalizing network may be applied completely
General note
It is recommended to switch off V
between tape and tape head while switching off.
August 1993
SYMBOL
A
N
(S+N)/N
I
I
Z
Switching thresholds
Equalization (pin 19)
V
I
I
Head switch (pin 14)
V
I
V
I
OGND
OVCC
EQ70
EQ120
IN1
IN2
O
V
EQS
IN1
IN2
Dual pre-amplifier and equalizer for
reverse tape decks
external. In this application the 8.2 k resistor has to be changed to 14 k and the internal resistor R
must be short-circuited by fixing the EQ-switch input at the 70 s position (pin 19; EQS left open-circuit). To activate
the inputs INA1 and INB1 pin 10 (HS) may be left open-circuit. In this event the DC level at pin 10 (HS) is 0.775 V
open-loop gain
equivalent noise voltage input
(RMS value)
signal-plus-noise to noise ratio
DC output voltage; pins 1 (OUTA)
and 16 (OUTB)
DC output current capability
DC output current capability
output impedance
voltage at pin EQS
70 s input current
120 s input current
inputs INA1 and INB1 active
maximum input current
inputs INA2 and INB2 active
maximum input current
pins INA1/INA2 to pin OUTA
pins INB1/INB2 to pin OUTB
PARAMETER
CC
with a gradient of 400 V/s at maximum to avoid plops on tape in the event of contact
f = 10 kHz
f = 400 Hz
unweighted;
20 Hz to 20 kHz;
R
internal gain 40 dB
linear;
CCIR/ARM weighted;
see Fig.4
reference to V
tape head DC coupled
to ground
to V
note 1
source
CC
CONDITIONS
6
= 0
REF;
80
104
68
300
0.65V
0.1V
2
250
150
50
MIN.
CC
CC
86
110
0.7
74
80
0.775V
90
0.225V
90
TYP.
CC
CC
Product specification
TEA0677T
1.4
100
5
1.0V
150
0.35V
0.15
150
1000
150
MAX.
EQ
CC
CC
= 5.8 k
dB
dB
dB
V
mA
V
V
V
UNIT
V
A
A
A
A
A
CC
.