August 1993

6

Philips Semiconductors

Product specification

Dual pre-amplifier and equalizer for

reverse tape decks

TEA0677T

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 k

must be short-circuited by fixing the EQ-switch input at the 70

µs position (pin 19; EQS left open-circuit). To activate

General note

between tape and tape head while switching off.

open-loop gain

pins INA1/INA2 to pin OUTA

f = 10 kHz

80

86

−

dB

pins INB1/INB2 to pin OUTB

f = 400 Hz

104

110

−

dB

N

equivalent noise voltage input

unweighted;

−

0.7

1.4

µV

(RMS value)

20 Hz to 20 kHz;

(S+N)/N

signal-plus-noise to noise ratio

internal gain 40 dB

linear;

68

74

−

dB

CCIR/ARM weighted;

see Fig.4

DC output voltage; pins 1 (OUTA)

−−

±0.15

V

and 16 (OUTB)

tape head DC coupled

DC output current capability

to ground

−2

−−

mA

DC output current capability

300

−−

µA

output impedance

−

80

100

Ω

Switching thresholds

Equalization (pin 19)

voltage at pin EQS

−−

5V

70

µs input current

−−

−150

µA

120

µs input current

−250

−−1000

µA

Head switch (pin 14)

inputs INA1 and INB1 active

note 1

V

maximum input current

−150

90

150

µA

inputs INA2 and INB2 active

maximum input current

−50

−90

−150

µA

SYMBOL

PARAMETER

CONDITIONS

MIN.

TYP.

MAX.

UNIT