TP5700AM datasheet(3/8 Pages) NSC

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DC Electrical Characteristics (Continued)

Unless otherwise specified all tests based on the test circuits shown in

Figure 1 all limits printed in bold characters are

guaranteed at TA e 0 Cto a60 C by correlation with 100% testing at TA e 25 C All other limits are assured by by correlation

with other production tests andor product design and characterization

Symbol

Parameter

Conditions

Min

Typ

Max

Units

RECEIVE AMPLIFIER

RRIN

Input Resistance

From Pin 12 to Vb

GRA

Gain at 1 kHz

RAGC e 0X MUTE IN s VMOFF

ILOOP e 20 mA TA e 25 C only

GRT

Gain Variation v TA

GRI

Gain Variation v ILOOP

ILOOP e 20 to 100 mA

6dB

GRM

Gain Change when MUTED

MUTE IN t VMON

Receive Noise

VRCVIN e 0V

dBrnC

SDR

SignalTotal Harmonic

VR e 200 mVrms

Distortion

ILOOP t 20 mA

VRC

Output Clipping Level

ILOOP t 20 mA

Vp-p

VROS

Output Offset Voltage

100

SIDETONE CHARACTERISTICS

STC

Sidetone Cancellation at 1kHz

20 mA s ILOOP s 100 mA (Note 2)

VOLTAGE REGULATOR OUTPUTS

VREG1

Output Voltage Pin 10

ILOOP t 20 mA

MUTE IN s VMOFF

MUTE IN t VMON

IREG1

Maximum Output Current

MUTE IN s VMOFF

200

Pin 10

MUTE IN t VMON

VREG2

Output Voltage Pin 11

ILOOP t 20 mA

IREG2

Maximum Output Current Pin 11

ILOOP t 20 mA

300

500

TLH5201 – 2

1a Test Circuit for Transmit and Sidetone

TLH5201 – 3

1b Test Circuit for Receive

FIGURE 1 Test Circuits for Electrical Characteristics

Note 1

Adjust VDC to set specified ILOOP current

Note 2

To measure Sidetone Cancellation set oscillator in

Fig 1a for VLe100 mVrms measure VS Then in Fig 1b set oscillator e 100 mVrms measure VR

STCe20log VR VS

Note 3

For operation above 25 C the device must be derated based on a 150 C maximum junction temperature and a thermal resistance of 70 CW junction to

ambiant

Functional Description

The TP5700A Telephone Speech Circuits are powered from

the telephone Tip and Ring terminals via a full-wave rectifier

bridge to protect against loop polarity reversals The devic-

es provide the following functions

LINE REGULATOR

A DC regulator sinks current from the loop in order to main-

tain a DC slope resistance similar to that of a standard phone

RDC provides an adjustment for the slope resistance

MICROPHONE AMPLIFIER

A single-ended input amplifier on the TP5700A enables a

low cost electret microphone to be used This provides su-

perior distortion linearity and noise performance compared

to a traditional carbon microphone The electret should be

capacitively coupled to the amplifier input The acoustic

sensitivity of the microphone is intended to be in the range

of b60 to b70 dBV mBar

Loss can be inserted if required by adding a resistive poten-

tiometer either at MIC IN1 or the connection between the

pre-amp output and driver stage input The driver stage pro-

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