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TP5700AM 数据表(PDF) 5 Page - National Semiconductor (TI) |
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TP5700AM 数据表(HTML) 5 Page - National Semiconductor (TI) |
5 / 8 page Connection Diagram Dual-In-Line Package TLH5201 – 5 Top View Order Number TP5700AM or TP5700AN See NS Package M16B or N16A Pin Descriptions Pins 1 2 RCV0a and RCV0b The push-pull complementary outputs of the receive amplifi- er Dynamic transducers with a minimum impedance of 100 X can be directly driven by these outputs Pin 3 Vb This is the negative supply input to the device and should be connected to the negative output of the polarity guard All other voltages on the device are referred to this pin Pin 4 ST This is the output of the Sidetone cancellation signal which requires a balance impedance of approximately 10 times the subscriber’s line impedance to be connected from this pin to Va (pin 13) Pin 5 XDI The input to the line output driver amplifier Transmit AGC is applied in this stage Pin 6 XPO This is the transmit pre-amp output which is normally capac- itively coupled to pin 5 Pin 7 MIC IN1 This is the inverting input to the transmit pre-amplifier and is intended to be capacitively coupled to an FET-buffered electret microphone Pin 8 DTMF IN The DTMF input which has an internal resistor to Vb to provide the emitter load resistor for a CMOS DTMF genera- tor This input is only active when MUTE IN (pin 9) is pulled high Pin 9 MUTE IN The MUTE Input which must be pulled at least 15V higher than Vb to mute MIC IN and enable DTMF IN Pin 10 VREG1 The regulated output for biasing a pulse dialer or DTMF generator A 47 mF decoupling capacitor to Vb should be fitted if this output is used Pin 11 VREG2 A 12V regulated output suitable for powering a low-voltage electret microphone A 1mF decoupling capacitor to Vb should be fitted if this output is used Pin 12 RCV IN The receive AGC amplifier input Pin 13 Va This is the positive supply input to the device and should be connected to the positive output of the polarity guard The current through this pin is modulated by the transmit signal Pin 14 RDC An external 1W resistor is required from this pin to Vb to control the DC input impedance of the circuit The nominal value is 56X for low voltage operation Values up to 82X may be used to increase the available transmit output volt- age swing at the expense of low voltage operation Pin 15 VBIAS This internal voltage bias line must be connected to Va via an external resistor Ro and decoupled to Vb with a 22 mF capacitor Ro dominates the AC input impedance of the cir- cuit and should be 620X for a 600X input impedance or 910X for a 900X input impedance Pin 16 RAGC The range of transmit and receive gain variations between short and long loops may be adjusted by connecting a resis- tor from this pin to Vb (pin 3) Figure 3 shows the relation- ship between the resistor value and the AGC range This pin may be left open-circuit to defeat AGC action TLH5201 – 7 FIGURE 3 5 |
类似零件编号 - TP5700AM |
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类似说明 - TP5700AM |
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