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零件编号 | TEA1096T | ||
描述 | Speech and listening-in IC | ||
制造商 | NXP Semiconductors | ||
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INTEGRATED CIRCUITS
DATA SHEET
TEA1096; TEA1096A
Speech and listening-in IC
Product Specification
File under Integrated Circuits, IC03
November 1994
Philips Semiconductors
Philips Semiconductors
Speech and listening-in IC
Product Specification
TEA1096; TEA1096A
FUNCTIONAL DESCRIPTION
Remark: all data given in this chapter are typical values
except when otherwise specified.
Supply pins SLPE, LN, VEE, VBB, VDD, REG and PD
The supply for the TEA1096/TEA1096A and its
peripherals is obtained from the telephone line. The
circuits regulate the line voltage and generate their own
supply voltages VDD and VBB to power the transmission
part and the loudspeaker amplifier respectively.
As can be seen from Fig.5, the line current (Iline) is split
between the sending output stage (Iln), the circuitry
connected to SLPE (Isl), the transmission circuit (IDD), the
peripheral circuits (Ip) and the current switch (ISUP). It can
be shown that:
ISUP = Iline − (Iln + Isl + IDD + IP)
With nominal conditions where:
Iln = 5 mA, Isl = 0.3 mA and IDD = 2.4 mA
it therefore follows that ISUP ≈ Iline − 7.7 mA − IP.
The remaining current ISUP is available for the listening-in
part. The current consumption IBB0 of the listening-in
circuitry is 2.5 mA. To power the loudspeaker, the line
current has to be more than 10 mA.
The voltage at SLPE is stabilized at 4.45 V nominal. The
DC line voltage is regulated at:
VLN = VSLPE + RSLPE × (Iline − Iln).
The supply voltage for the transmission part and
peripheral circuits (VDD) is generated from VSLPE and is
equal to VDD = VSLPE − RDD × (IDD + Ip).
VBB supplies the listening-in circuitry and is stabilized at
3.6 V nominal.
A resistor connected between pin REG and VEE can be
used to decrease the SLPE voltage while maintaining VBB
at its nominal value, whereas a resistor connected
between pin REG and pin SLPE will increase the SLPE
voltage while maintaining VBB at its nominal value. When
adjusting the SLPE voltage to a lower value, care should
be taken that the VSLPE is at least 0.4 V higher than VBB
(VBB supply efficiency).
November 1994
Fig.5 Supply arrangement.
8
Philips Semiconductors
Speech and listening-in IC
Product Specification
TEA1096; TEA1096A
Fig.16 Loudspeaker amplifier channel.
Dynamic limiter/loudspeaker amplifier disabling;
pin DLL/DIL
The dynamic limiter in the loudspeaker channel of the
TEA1096/TEA1096A prevents clipping of the loudspeaker
output stage and protects the functioning of the circuit
when low supply conditions are detected.
Hard clipping of the loudspeaker output stage is prevented
by rapidly reducing the gain when the output stage starts
to saturate. The time in which the gain reduction is effected
(clipping attack time) is approximately a few milliseconds.
The loudspeaker amplifier stays in the reduced gain mode
until the peaks of the loudspeaker signals no longer start
to cause saturation. The gain of the loudspeaker amplifier
then returns to its normal value within the clipping release
time. Both attack and release time are proportional to the
value of the capacitor CDLL. The THD of the loudspeaker
amplifier in the reduced gain mode stays below 5% up to
10 dB of input voltage overdrive.
When the supply conditions drop below the required level,
the gain of the loudspeaker amplifier is reduced in order to
prevent the device from malfunctioning. When the supply
current drops below the required level, the supply voltage
VBB decreases. In this condition, the gain of the
loudspeaker amplifier is reduced slowly (approximately a
few seconds). When the supply voltage continues to
decrease and drops below an internal threshold of 2.8 V,
the gain of the loudspeaker amplifier is rapidly reduced
(approximately 1 ms). After returning to normal supply
conditions, the gain of the loudspeaker amplifier is raised
again.
The dynamic limiter also provides a loudspeaker disable
when pin DLL/DIL is short-circuited to VEE. The
loudspeaker gain is then typically 80 dB lower. The
release time is approximately 10 ms.
November 1994
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页数 | 30 页 | ||
下载 | [ TEA1096T.PDF 数据手册 ] |
零件编号 | 描述 | 制造商 |
TEA1096 | Speech and listening-in IC | NXP Semiconductors |
TEA1096A | Speech and listening-in IC | NXP Semiconductors |
TEA1096AT | Speech and listening-in IC | NXP Semiconductors |
TEA1096T | Speech and listening-in IC | NXP Semiconductors |
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