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

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

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 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

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

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

Pin 10

The regulated output for biasing a pulse dialer or DTMF

fitted if this output is used

Pin 11

A 12V regulated output suitable for powering a low-voltage

should be fitted if this output is used

Pin 12

RCV IN

The receive AGC amplifier input

Pin 13

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

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

cuit and should be 620X for a 600X input impedance or

910X for a 900X input impedance

Pin 16

The range of transmit and receive gain variations between

short and long loops may be adjusted by connecting a resis-

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