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參數(shù)資料
| 型號(hào)： | BL1062A1 |
| 廠(chǎng)商： | 上海貝嶺股份有限公司 |
| 英文描述： | Low voltage transmission circuits with dialer interface |
| 中文描述： | 低電壓與撥號(hào)器接口傳輸電路 |
| 文件頁(yè)數(shù)： | 2/7頁(yè) |
| 文件大?。?/td> | 263K |
| 代理商： | BL1062A1 |
BL1062A1
Pin Configurations, Definitions
SYMBOL
PIN
DESCRIPTION
LN
1
positive line terminal
GAS1
2
gain
adjustment;
transmitting
amplifier
GAS2
3
gain adjustment; transmitting
amplifier
QR
4
non-inverting output; receiving
amplifier
GAR
5
gain adjustment; receiving
amplifier
MI
Χ
6
Inverting microphone input
MIC+
7
non-inverting microphone input
NC
8
NC
V
EE
9
Negative line terminal
IR
10
Receiving amplifier input
DTMF
11
dual-tone multi-frequency input
MUTE
12
mute input (see note 1)
V
CC
13
positive supply decoupling
REG
14
voltage regulator decoupling
AGC
15
automatic gain control input
SLPE
16
slope (DC resistance) adjustment
http://www.belling.com.cn
- 2 -
8/25/2006
Wrote by 2006
Total
7 Pages
4.
5.
Supplies VCC , LN, SLPE, REG
Power for the IC and its peripheral circuits is usually obtained from the telephone line. The
supply voltage is derived from the line via a dropping resistor and regulated by the IC. The supply
voltage
VCC
may also be used to supply external circuits e.g. dialling and control circuits.
Decoupling of the supply voltage is performed by a capacitor between V
CC
and V
EE
. The internal
voltage regulator is decoupled by a capacitor between REG and V
EE
. The DC current flowing into
the set is determined by the exchange supply voltage V
exch,
the feeding bridge resistance R
exch
and the DC resistance of the telephone line R
line
.
At line currents below 9 mA the internal reference voltage is automatically adjusted to a lower
value (typically 1.6 V at 1 mA). This means that more sets can be operated in parallel with DC line
voltages (excluding the polarity guard) down to an absolute minimum voltage of 1.6 V. At line
currents below 9 mA the circuit has limited sending and receiving levels. The internal reference
voltage can be adjusted by means of an external resistor (R
VA
). This resistor when connected
between LN and REG will decrease the internal reference voltage and when connected between
REG and SLPE will increase the internal reference voltage.
Function Description
Microphone inputs MIC+ and MIC
and gain pins GAS1 and GAS2
The circuit has symmetrical microphone inputs. Its input impedance is 64 k
(2 x
32 k
) and
its voltage gain is typically 52 dB (when R7 = 68 k
, see Figures 2 and 3). Dynamic, magnetic,
piezoelectric or electret (with built-in FET source followers) can be used. The gain of the
microphone amplifier can be adjusted between 44 dB and 52 dB to suit the sensitivity of the
transducer in use. The gain is proportional to the value of R7, which is connected between GAS1
and GAS2.
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