Speech Network. XR-T5995 Datasheet
The XR-T5995 Speech Network is a monolithic integrated
circuit specifically designed for implementing a low cost
telephone set circuit. It is designed to use a electrodynamic
microphone and electromagnetic receiver to replace a car-
bon microphone and telephone network hybrid.
FUNCTIONAL BLOCK DIAGRAM
Interfaces with Inexpensive'Condenser Electret
Microphone, Electromagnetic Receiver
Low Voltage CMOS Process to Operate from 20 mA
to 100 mA Loop Current
Minimum External Component Counts
Uses Inexpensive and Non-critical External Components
A DTMF Input for Tone Dialing
External Mute Capability
Low Cost Telephone Set
OOC to 70°C
OOC to 70°C
ABSOLUTE MAXIMUM RATINGS
DC Supply Voltage VDD
OOC to 70°C
-55°C to 125°C
The XR-T5995 Speech Network contains all the necessary
circuits to perform hybrid operation. (On board micro-
phone, receiver amplifier and driver, external muting for
tone dialing or pulse dialing.) A DTMF is provided to inter-
face to Touch Tone dialing.
VL Operating Voltage
IL Operating Current
GT Transmitter Gain
DT Transmit Distortion
NT Transmit Noise Level
OT Transmit Output
GR Receiver Gain
DR Receive Distortion
NR Receive Noise Level
OR Receiver Output Level
ZNET Network Impedance
ST Side Tone
GDT DTMF Gain
GAT Audible Tone Gain
ZT Transmit Input Impedance
ZR Receive Input Impedance
MIN. TYP. MAX. UNIT
2.7 9 V
15 100 mA
39.5 43.5 47.5 dB
-14.8 -10.8 -6.8 dB
350 750 n
10 14 18 dB
-7 -3 +1
VIN = 3 mY, I = 1 KHz
VL::: 1.2 Vp/p,1 = 1 KHz
VL = 100 mV,I= 1 KHz
VR = .3 Vp/p, f = 1 KHz
VL = .5 Vp/p, f = 1 KHz
VDT = .03 V, f = 1 KHz
PIN AND FUNCTION DESCRIPTIONS
Most negative supply terminal.
Current sense input, allows loop loos compensation for re-
ceiving or transmitting amplifiers.
To hold DC current and AC input impedance matching seen
on the phone line.
Automatic gain control unit to set transmit and receive
ar1plifier gain and attenuation on different line loop
Most positive regulated supply terminal.
OUT (-1). OUT (+)
Differential output driver, used to drive a speaker or an
External pacifier tone input, to provide audio feedback
to the user that a key has been depressed in dial pulse
RC .. RIN
Input, output of receiving amplifJOr.
External mute input is provided to mute the line receive
amp and to insert the tone to the receiver.
This input is used with a Touch Tone dialer to insert the
DTMF signal to the line.
Microphone input, output to transmitting amplifier.
Sidetone compensation input.