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參數(shù)資料
| 型號： | 935262584512 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | TELEPHONE SPEECH CKT, PDSO16 |
| 封裝： | PLASTIC, SOT-109, SO-16 |
| 文件頁數(shù)： | 26/30頁 |
| 文件大小： | 178K |
| 代理商： | 935262584512 |
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2000 Feb 18
5
Philips Semiconductors
Product specication
Speech circuit with dialler interface, regulated
supply and earpiece volume control
TEA1111A
FUNCTIONAL DESCRIPTION
All data given in this chapter concerns typical values,
except when otherwise specified.
Supply (pins LN, SLPE, REG, VCC and VDD)
The supply for the TEA1111A and its peripherals is
obtained from the telephone line (see Fig.3).
THE LINE INTERFACE (PINS LN, SLPE AND REG)
The IC generates a stabilized reference voltage (Vref)
across pins LN and SLPE. Vref is temperature
compensated and can be adjusted by using an external
resistor (RVA). Vref equals 3.8 V and can be increased by
connecting RVA between pins REG and SLPE or
decreased by connecting RVA between pins REG and LN.
The voltage at pin REG is used by the internal regulator to
generate Vref and is decoupled by CREG, which is
connected to VEE. This capacitor, converted to an
equivalent inductance, (see Section “Set impedance”)
determines the set impedance conversion from its DC
value (RSLPE) to its AC value (RCC in the audio-frequency
range). The voltage at pin SLPE is proportional to the line
current.
The voltage at pin LN is:
VLN =Vref +RSLPE × ISLPE
ISLPE =Iline ICC IP ISUP ILEDC
where:
Iline = line current
ICC = current consumption of the IC
IP = supply current for external circuits
ISUP = current consumed between LN and VEE by the
VDD regulator
ILEDC = supply current for external LED circuitry.
The preferred value for RSLPE is 20 . Changing RSLPE will
affect more than the DC characteristics; it also influences
the microphone and DTMF gains, the gain control
characteristics, the sidetone level and the maximum
output swing on the line.
The DC line current flowing into the set is determined by
the exchange supply voltage (VEXCH), the feeding bridge
resistance (REXCH), the DC resistance of the telephone
line (Rline) and the reference voltage (Vref). With line
currents below Ilow (9 mA), the internal reference voltage
(generating Vref) is automatically adjusted to a lower value.
This means that several sets can operate in parallel with
DC line voltages (excluding the polarity guard) down to an
absolute minimum voltage of 1.5 V. At line currents below
Ilow, the circuit has limited sending and receiving levels.
This is called the low voltage area.
THE INTERNAL SUPPLY POINT (PIN VCC)
The internal circuitry of the TEA1111A is supplied from
pin VCC. This voltage supply is derived from the line
voltage by means of a resistor (RCC) and must be
decoupled by a capacitor CVCC. It may also be used to
supply some external circuits.
The VCC voltage (see also Figs 4 and 5) depends on the
current consumed by the IC and the peripheral circuits as:
VCC0 =VLN RCC × ICC
VCC =VCC0 RCC × (IP +Irec)
Where Irec is the current consumed by the output stage of
the earpiece amplifier.
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