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TEA1112 Datasheet(PDF) 2 Page - NXP Semiconductors

Part No. TEA1112
Description  Low voltage versatile telephone transmission circuits with dialler interface
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Maker  PHILIPS [NXP Semiconductors]
Homepage  http://www.nxp.com
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TEA1112 Datasheet(HTML) 2 Page - NXP Semiconductors

 
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1997 Mar 26
2
Philips Semiconductors
Product specification
Low voltage versatile telephone
transmission circuits with dialler interface
TEA1112; TEA1112A
FEATURES
• Low DC line voltage; operates down to 1.6 V (excluding
polarity guard)
• Voltage regulator with adjustable DC voltage
• Provides a supply for external circuits
• Symmetrical high impedance inputs (64 kΩ) for
dynamic, magnetic or piezo-electric microphones
• Asymmetrical high impedance input (32 kΩ) for electret
microphones
• DTMF input with confidence tone
• Mute input for pulse or DTMF dialling (MUTE for
TEA1112 and MUTE for TEA1112A)
• Receiving amplifier for dynamic, magnetic or
piezo-electric earpieces
• AGC line loss compensation for microphone and
earpiece amplifiers
• LED on-hook/off-hook status indication
• Microphone mute function (MMUTE for TEA1112 and
MMUTE for TEA1112A).
APPLICATION
• Line powered telephone sets, cordless telephones, fax
machines and answering machines.
GENERAL DESCRIPTION
The TEA1112; TEA1112A are bipolar integrated circuits
that perform all speech and line interface functions
required in fully electronic telephone sets. They perform
electronic switching between speech and dialling. The ICs
operate at a line voltage down to 1.6 V DC (with reduced
performance) to facilitate the use of telephone sets
connected in parallel.
A current (proportional to the line current and internally
limited to a typical value of 19.5 mA) is available to drive
an LED which indicates the on-hook/off-hook status.
The microphone amplifier can be disabled during speech
condition by means of a microphone mute function.
All statements and values refer to all versions unless
otherwise specified.
QUICK REFERENCE DATA
Iline = 15 mA; VEE =0V; RSLPE =20 Ω; AGC pin connected to VEE; Zline = 600 Ω; f = 1 kHz; Tamb =25 °C;
unless otherwise specified.
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
Iline
line current operating range
normal operation
11
140
mA
with reduced performance
1
11
mA
ILED(max)
maximum supply current available
Iline =18mA
0.5
mA
Iline >76mA
19.5
mA
VLN
DC line voltage
3.35
3.65
3.95
V
ICC
internal current consumption
VCC = 2.9 V
1.15
1.4
mA
VCC
supply voltage for peripherals
Ip =0mA
2.9
V
Gvtrx
typical voltage gain range
microphone amplifier
VMIC = 2 mV (RMS)
38.8
51.8
dB
receiving amplifier
VIR = 6 mV (RMS)
19.2
31.2
dB
∆G
vtrx
gain control range for microphone and
receiving amplifiers with respect to
Iline =15mA
Iline =85mA
5.8
dB
∆G
vtxm
microphone amplifier gain reduction
80
dB


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