TEA1110AL-S14-R datasheet(6/9 Pages) UTC

6 / 9 page

TEA1110A

LINEAR INTEGRATED CIRCUIT

UNISONICTECHNOLOGIESCO.,LTD

6 of 9

www.unisonic.com.tw

QW-R108-014.C

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 Ω. 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.

RCC

SLPE

REG

VEE

from pre amp

ICC

VCC

Fig 1. Supply configuration.

Rexch

Vexch

lline

Rline

UTC

TEA1110A

Ish

ISLPE

RSLPE

20Ω

619Ω

CREG

4.7μF

CVCC

100μF

Peripheral

circuits

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