TEA0676 データシートの表示（PDF） - Philips Electronics

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TEA0676

Dual pre-amplifier and equalizer for reverse tape decks

Philips Electronics 

Philips Semiconductors

Dual pre-amplifier and equalizer for

reverse tape decks

Product specification

TEA0676T

SYMBOL

PARAMETER

CONDITIONS

MIN.

TYP.

MAX. UNIT

Switching thresholds

EQUALIZATION TIME CONSTANT SWITCHING

VEQSW

pin voltage

IEQSW

input current

VEQSW(HIGH) pin voltage

VEQSW(LOW) pin voltage

load current +100 to −100 µA

VEQSW = 0 to VCC

time constant 70 µs active

time constant 120 µs active

−

0.8VCC −

V

−180

−

+180

µA

1⁄2VCC + 0.5 −

VCC

V

0

−

1⁄2VCC − 0.5 V

HEAD SWITCHING

VHSW

IHSW

VHSW(HIGH)

VHSW(LOW)

pin voltage

input current

HIGH-level pin voltage

LOW-level pin voltage

load current +90 to −90 µA

VHSW = 0 to VCC

inputs INA1 and INB1 active

inputs INA2 and INB2 active

−

0.8VCC −

V

−170

−

+170

µA

1⁄2VCC + 0.5 −

VCC

V

0

−

1⁄2VCC − 0.5 V

Notes

1. For an application with a fixed equalization 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 equalization switch input at 70 µs (pin 15 left open-circuit). To activate the inputs

INA1 and INB1, pin 10 (HSW) might be left open-circuit. In this event the DC level at pin 10 (HSW) is 0.8VCC

2. It is recommended to switch off VCC with a gradient of 400 V/s at maximum to avoid plops on the tape in the event

of contact between tape and tape head while switching off.

1997 Oct 07

7

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