TEA0677T View Datasheet(PDF) - Philips Electronics
Part Name
Description
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TEA0677T Datasheet PDF : 13 Pages
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Philips Semiconductors
Dual pre-amplifier and equalizer for
reverse tape decks
Product specification
TEA0677T
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX. UNIT
AV
open-loop gain
pins INA1/INA2 to pin OUTA
pins INB1/INB2 to pin OUTB
N
equivalent noise voltage input
(RMS value)
(S+N)/N signal-plus-noise to noise ratio
f = 10 kHz
80
86
f = 400 Hz
104
110
unweighted;
−
0.7
20 Hz to 20 kHz;
Rsource = 0 Ω
internal gain 40 dB
68
74
linear;
−
dB
−
dB
1.4
µV
−
dB
CCIR/ARM weighted;
see Fig.4
DC output voltage; pins 1 (OUTA)
reference to VREF;
−
−
and 16 (OUTB)
tape head DC coupled
±0.15 V
IOGND
IOVCC
ZO
DC output current capability
DC output current capability
output impedance
to ground
to VCC
−2
−
300
−
−
80
−
mA
−
µA
100
Ω
Switching thresholds
Equalization (pin 19)
VEQS
voltage at pin EQS
IEQ70
70 µs input current
IEQ120
120 µs input current
Head switch (pin 14)
−
−
−
−
−250 −
5
V
−150 µA
−1000 µA
VIN1
inputs INA1 and INB1 active
IIN1
maximum input current
VIN2
inputs INA2 and INB2 active
IIN2
maximum input current
note 1
0.65VCC 0.775VCC 1.0VCC V
−150 90
150
µA
0.1VCC 0.225VCC 0.35VCC V
−50
−90
−150 µA
Note to the characteristics
1. For an application with a fixed EQ time constant of 120 µs the equalizing network may be applied completely
external. In this application the 8.2 kΩ resistor has to be changed to 14 kΩ and the internal resistor REQ = 5.8 kΩ
must be short-circuited by fixing the EQ-switch input at the 70 µs 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 VCC.
General note
It is recommended to switch off VCC with a gradient of 400 V/s at maximum to avoid plops on tape in the event of contact
between tape and tape head while switching off.
August 1993
6
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