TEA1096 查看數據表（PDF） - Philips Electronics
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TEA1096 Datasheet PDF : 32 Pages
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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
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