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TEA0677 数据表(PDF) 6 Page - NXP Semiconductors |
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TEA0677 数据表(HTML) 6 Page - NXP Semiconductors |
6 / 13 page 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 Ω 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. AV 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; Rsource = 0 Ω (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) reference to VREF; −− ±0.15 V and 16 (OUTB) tape head DC coupled IOGND DC output current capability to ground −2 −− mA IOVCC DC output current capability to VCC 300 −− µA ZO output impedance − 80 100 Ω Switching thresholds Equalization (pin 19) VEQS voltage at pin EQS −− 5V IEQ70 70 µs input current −− −150 µA IEQ120 120 µs input current −250 −−1000 µA Head switch (pin 14) VIN1 inputs INA1 and INB1 active note 1 0.65VCC 0.775VCC 1.0VCC V IIN1 maximum input current −150 90 150 µA VIN2 inputs INA2 and INB2 active 0.1VCC 0.225VCC 0.35VCC V IIN2 maximum input current −50 −90 −150 µA SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT |
类似零件编号 - TEA0677 |
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类似说明 - TEA0677 |
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