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參數(shù)資料
| 型號： | 935263971118 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 通信及網(wǎng)絡 |
| 英文描述： | SPECIALTY TELECOM CIRCUIT, PDSO28 |
| 封裝： | PLASTIC, SOT-136, SO-28 |
| 文件頁數(shù)： | 5/38頁 |
| 文件大?。?/td> | 287K |
| 代理商： | 935263971118 |
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1999 Feb 17
13
Philips Semiconductors
Product specication
Cordless telephone, answering machine
line interface
UBA1707
Fig.11 Equivalent circuit of an anti-sidetone network in a Wheatstone bridge configuration.
handbook, full pagewidth
MGL217
Im
ZRXI
RXI
Zbal
Rast1
SLPE
RSLPE
GND
Zline
ZSET
LN
RA
AUTOMATIC GAIN CONTROL (PIN AGC; BITS RAGC1,
RAGC2, SAGC AND AGC)
The UBA1707 performs automatic line loss compensation.
The automatic gain control varies the gain of the transmit
amplifier and the gain of the receive amplifier in
accordance with the DC line current. The control range is
6.5 dB (which roughly corresponds to a line length of
5.5 km for a 0.5 mm diameter twisted-pair copper cable
with a DC resistance of 176
/km and an average
attenuation of 1.2 dB/km).
When the line current is greater than Istop, the voltage
gains are minimum. When the line current is less than Istart,
the voltage gains are maximum. When the AGC pin is
connected to pin GND, the start line current (Istart) can be
chosen between 22.5 and 29.5 mA via bits RAGC1 and
RAGC2 through the serial interface. Two values for the
Istop/Istart ratio (slope of the AGC) are possible via the bit
SAGC through the serial interface. When bit SAGC is at
logic 0 then Istop = 2.7 × Istart (optimized for voltage
regulation mode). When SAGC is at logic 1 then
Istop = 1.9 × Istart (optimized for current regulation mode).
An external resistor RAGC (connected between pins GND
and AGC) enables the Istart and Istop line currents to be
increased (the ratio between Istart and Istop is not affected
by this external resistor). So internal and external
adjustments of the automatic gain control allow
optimization of the IC for many configurations of exchange
supply voltage and feeding bridge resistance. Part of the
line current flows into the ZSET impedance network. The IC
has been optimized for ZSET = 619 . Changing this 619
value slightly modifies Istop and Istart line currents as well as
the value of the two AGC slopes.
The automatic gain control function can be disabled by
setting the AGC bit to logic 0 via the serial interface or
when pin AGC is left open-circuit. In this case both of the
voltage gains are maximum.
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