參數(shù)資料
型號(hào)： 935084920112
廠商： NXP SEMICONDUCTORS
元件分類(lèi)： 無(wú)繩電話(huà)/電話(huà)
英文描述： TELEPHONE SPEECH CKT, PDSO20
封裝： PLASTIC, SOT-163, SO-20
文件頁(yè)數(shù)： 36/38頁(yè)
文件大?。?/td> 303K
代理商： 935084920112
March 1994
7
Philips Semiconductors
Product specication
Low voltage versatile telephone transmission circuit
with dialler interface and transmit level dynamic limiting
TEA1064A
The maximum AC output swing on the line at low line
currents is influenced by R16 (limited by current) and the
maximum output swing on the line at high line currents is
influenced by the DC voltage VLN-SLPE (limited by voltage).
In both these situations, the internal dynamic limiter in the
sending channel prevents distortion when the microphone
input is overdriven. The maximum AC output swing on LN
is shown in Fig.5; practical values for R16 are from 200 to
600
and this influences both the maximum output swing
at low line currents and the supply capabilities.
The SLPE pin is the ground reference for peripheral
circuits, therefore inputs MUTE, PD and DTMF are also
referenced to SLPE.
Active microphones can be supplied between VCC1 and
VEE. Low-power circuits that provide only MUTE and/or PD
inputs to the TEA1064A also can be powered from VCC1.
However VCC1 cannot be used for circuits that provide
DTMF signals to the TEA1064A because VCC1 is referred
to ground.
If the line current lline exceeds ICC1 + 0.25 mA, the voltage
converter shunts the excess current to SLPE via LN;
where ICC1 ≈ 1.3 mA, the value required by the IC for
normal operation.
Fig.4
Minimum supply current for peripherals (Ip)
as a function of the peripheral supply
voltage (Vp).
handbook, halfpage
2
5
0
1
MGR059
2
3
4
34
Vp (V)
Ip
(mA)
R
VA
(REG-SLPE)
=
20
k
without
R
VA
(REG-SLPE)
lline = 15 mA; R16 = 392 ; R15 = 0 ; valid for MUTE = 0 and 1.
Line current has very little influence
The DC line voltage on LN is:
VLN =VLN-SLPE + (ISLPE × R9)
VLN =Vref + ([Iline ICC1 0.25 × 103 A] × R9)
in which
Vref = 3.3 V ± 0.25 V is the internal reference voltage
between VCC2 and SLPE; its value can be adjusted by
external resistor RVA
R9 = external resistor between SLPE and VEE (20 in
basic application).
With R9 = 20
, this results in:
VLN = 3.57 ± 0.25 V at lline =15mA
VLN = 4.17 ± 0.3 V at lline =15mA,
RVA(REG-SLPE) =33k
VLN = 4.57 ± 0.35 V at lline = 15 mA,
RVA(REG-SLPE) =20k
The preferred value for R9 is 20
. Changing R9
influences microphone gain, DTMF gain, the gain control
characteristics, sidetone, and the DC characteristics
(especially the low voltage characteristics).
In normal conditions, ISLPE >> (ICC1 + 0.25 mA) and the
static behaviour is equivalent to a voltage regulator diode
with an internal resistance of R9. In the audio frequency
range the dynamic impedance is determined mainly by R1.
The equivalent impedance of the circuit in the audio
frequency range is shown in Fig.6.
The internal reference voltage VCC2-SLPE can be increased
by external resistor RVA(REG-SLPE) connected between
REG and SLPE. The supply voltage VCC2-SLPE is shown as
a function of RVA(REG-SLPE) in Fig.7. Changing the
reference voltage influences the output swing of both
sending and receiving amplifiers.
At line currents below 8 mA (typ.), the DC voltage dropped
across the circuit is adjusted to a lower level automatically
(approximately 1.8 V at 2 mA). This gives the possibility of
operating more telephone sets in parallel with DC line
voltages (excluding polarity guard) down to an absolute
minimum of 1.8 V. At line currents below 8 mA (typ.), the
circuit has limited sending and receiving levels.
相關(guān)PDF資料
PDF描述
935084920118 TELEPHONE SPEECH CKT, PDSO20
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