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TEA1110A View Datasheet(PDF) - Unisonic Technologies

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TEA1110A Datasheet PDF : 9 Pages
1 2 3 4 5 6 7 8 9
TEA1110A
LINEAR INTEGRATED CIRCUIT
„ FUNCTIONAL DESCRIPTION
Supply (pins LN, SLPE, VCC and REG)
The UTC TEA1110A and its peripheral circuit derive the power supply from telephone line (see Fig.1). The IC
generates a stabilized reference voltage (VREF) between pins LN and SLPE. The voltage at pin SLPE is proportional
to the line current. VREF is temperature compensated and can be adjusted by means of an external resistor (RVA).
VREF is set to 3.35 V, which can be increased by connecting RVA between pins REG and SLPE (see Fig.2) and be
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, which is connected to VEE. This CREG capacitor converted into an equivalent
inductance (see Section “Set impedance”) realizes the set impedance conversion from its DC value (RSLPE) to its AC
value (RCC in the audio-frequency range).
In the following formula, the most appropriate value for RSLPE is 20 . The changing of RSLPE will affect the DC
characteristics; furthermore, it can influence the microphone and DTMF gains, the gain control characteristics, the
side tone level and the maximum output swing on the line.
The voltage at pin LN is:
VLN = VREF +RSLPE×ISLPE
ISLPE = IIINE-ICC-IP-I*
Where: ILINE = line current
ICC = current consumption of the IC
IP = supply current for peripheral circuits
I* = current consumed between LN and VEE.
Rline
lline
Rexch
Ish
+
- Vexch
ISLPE
RCC
LN
619
1
UTC
TEA1110A
I*
+
-
Vd
-+
from pre amp
2
SLPE
RSLPE
20
3
REG
+
CREG
4.7μF
VCC
14
ICC
11
VEE
IP
+ CVCC Peripheral
100μF circuits
Fig 1. Supply configuration.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
6 of 9
QW-R108-014.C
 

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