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參數資料
| 型號： | UBA2051T |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | One-chip telephone ICs with speech, dialler and ringer functions |
| 中文描述： | TELEPHONE MULTIFUNCTION CKT, PDSO28 |
| 封裝： | PLASTIC, SOT-136, SO-28 |
| 文件頁數： | 15/52頁 |
| 文件大小： | 292K |
| 代理商： | UBA2051T |
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2000 May 19
15
Philips Semiconductors
Product specification
One-chip telephone ICs with speech,
dialler and ringer functions
UBA2050(A); UBA2051(A;C)
A
UTOMATIC GAIN CONTROL
(
PIN
AGC)
The UBA205xx performs automatic line loss
compensation. The automatic gain control varies the gain
of the microphone amplifier and the gain of the receive
amplifier in accordance with the DC line current.
The control range is 6.0 dB. This corresponds
approximately to the loss for a cable length of 5 km with an
0.5 mm diameter twisted copper-pair, a DC resistance of
176
/km and an average attenuation of 1.2 dB/km).
The IC can be used with different configurations of
exchange supply voltage and feeding bridge resistance by
connecting an external resistor R
AGC
between pins AGC
and GND (see Fig.15). This resistor enables the I
start
and
I
stop
line currents to be increased (the ratio between I
start
and I
stop
is not affected by the resistor).
The AGC function is disabled when pin AGC is left
open-circuit.
handbook, full pagewidth
MGT049
6
4
2
0
100
80
60
40
20
90
70
50
30
10
0
Gv
(dB)
Iline (mA)
0
10
20
30 k
RAGC =
∞
Fig.15 Variation of gain as a function of line current with R
AGC
as parameter.
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