tea1099h NXP Semiconductors, tea1099h Datasheet - Page 10

• Manufacturer Part Number: tea1099h
• Description: Speech And Handsfree Ic With Auxiliary Inputs/outputs And Analog Multiplexer
• Manufacturer: NXP Semiconductors

Philips Semiconductors
Transmit channels (pins MIC+, MIC , DTMF, TXAUX,
HFTX and LN)
H
LN)
The TEA1099H has symmetrical microphone inputs.
The input impedance between MIC+ and MIC is
70 k
and LN is set to 44.3 dB. Without limitation from the output,
the microphone input stage can accommodate signals up
to 18 mV (RMS) at room temperature for 2% of THD.
The microphone inputs are biased at one diode voltage.
Automatic gain control is provided for line loss
compensation.
DTMF
The TEA1099H has an asymmetrical DTMF input.
The input impedance between DTMF and GND is
20 k (typ.). The voltage gain between pins DTMF and LN
is set to 25.35 dB. Without limitation from the output, the
input stage can accommodate signals up to
180 mV (RMS) at room temperature for 2% of THD.
When the DTMF amplifier is enabled, dialling tones may
be sent on the line. These tones can be heard in the
earpiece or in the loudspeaker at a low level. This is called
the confidence tone. The voltage attenuation between pins
DTMF and RECO is typically equal to 16.5 dB.
The DC biasing of this input is 0 V.
The automatic gain control has no effect on these
channels.
A
The TEA1099H has an asymmetrical auxiliary input
TXAUX. The input impedance between TXAUX and GND
is 20 k (typ.). The voltage gain between pins TXAUX and
LN is set to 12.5 dB. Without limitation from the output, the
input stage can accommodate signals up to 1.2 V (RMS)
at room temperature for 2% of THD. The TXAUX input is
biased at two diodes voltage.
Automatic gain control is provided for line loss
compensation.
1999 Apr 08
UXILIARY TRANSMIT AMPLIFIER
ANDSET MICROPHONE AMPLIFIER
Speech and handsfree IC with auxiliary
inputs/outputs and analog multiplexer
AMPLIFIER
typ. . The voltage gain between pins MIC+/MIC
(
PINS
DTMF, LN
(
PINS
(
AND
PINS
TXAUX
RECO)
MIC+, MIC
AND
LN)
AND
10
H
The TEA1099H has an asymmetrical HFTX input, which is
mainly intended for use in combination with the TXOUT
output. The input impedance between HFTX and GND is
20 k (typ.). The voltage gain between pins HFTX and LN
is set to 34.7 dB. Without limitation from the output, the
input stage can accommodate signals up to 95 mV (RMS)
at room temperature for 2% of THD. The HFTX input is
biased at two diodes voltage.
Automatic gain control is provided for line loss
compensation.
M
AND
The voltage gain between the microphone inputs
MIC+/MIC and the output TXOUT is set to 49.8 dB. This
channel gives an image of the signal sent on the line while
speaking in the handset microphone. Using external
circuitry, this signal can be used for several purposes such
as sending dynamic limitation or anti-howling in a
listening-in application. The TXOUT output is biased at two
diodes voltage.
The automatic gain control has no effect on these
channels.
Receive channels (pins IR, RAUX, RECO, GARX and
QR)
RX
The receive amplifier has one input IR which is referred to
the line. The input impedance between pins IR and LN is
20 k (typ.) and the DC biasing between these pins is
equal to one diode voltage. The gain between pins IR
(referred to LN) and RECO is typically equal to 29.7 dB.
Without limitation from the output, the input stage can
accommodate signals up to 50 mV (RMS) at room
temperature for 2% of THD.
This receive amplifier has a rail-to-rail output RECO, which
is designed for use with high ohmic (real) loads (larger
than 5 k ). This output is biased at two diodes voltage.
Automatic gain control is provided for line loss
compensation.
ANDSFREE TRANSMIT OUTPUT STAGE
ICROPHONE MONITORING ON
AMPLIFIER
TXOUT)
(
PINS
IR
AND
RECO)
TXOUT (
(
Product specification
PINS
PINS
TEA1099H
HFTX
MIC+, MIC
AND
LN)