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參數(shù)資料
| 型號： | FM1062 |
| 英文描述： | Low Voltage Transmission Circuit |
| 中文描述： | 低壓輸電線路 |
| 文件頁數(shù)： | 2/6頁 |
| 文件大?。?/td> | 102K |
| 代理商： | FM1062 |
4.
Pin Configurations, Definitions
SYMBOL
LN
GAS1
PIN
1
2
DESCRIPTION
positive line terminal
gain
adjustment;
amplifier
gain adjustment; transmitting
amplifier
non-inverting output; receiving
amplifier
gain adjustment; receiving
amplifier
inverting microphone input
non-inverting microphone input
NC
negative line terminal
receiving amplifier input
dual-tone multi-frequency input
mute input (see note 1)
positive supply decoupling
voltage regulator decoupling
automatic gain control input
slope (DC resistance) adjustment
transmitting
GAS2
3
QR
4
GAR
5
MI
Χ
MIC+
NC
V
EE
IR
DTMF
MUTE
V
CC
REG
AGC
SLPE
Note
Pin 12 is active HIGH (MUTE) for FM1062 and LOW (MUTE) for FM1062A.
6
7
8
9
10
11
12
13
14
15
16
5.
Supplies V
CC
, 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.
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
5
6
7
8
12
11
10
9
F
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| FM1062A | Low Voltage Transmission Circuit |
| FM1208-250PC | NVRAM (Ferroelectric Based) |
| FM1208-250PSC | NVRAM (Ferroelectric Based) |
| FM1208-250SC | NVRAM (Ferroelectric Based) |
| FM120 | CABLE ASSEM 2MM 10POS F-F 2,1 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| FM1062A | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Low Voltage Transmission Circuit |
| FM1063-3005-A | 功能描述:支架與墊片 M3X0.5 Aluminum RoHS:否 制造商:Schurter 類型:Transipillar Spacers 長度:16 m 螺紋大小:M4 外徑:10 mm 材料:Nylon with Steel 電鍍:Zinc |
| FM-106PIN | 制造商:MA-COM 制造商全稱:M/A-COM Technology Solutions, Inc. 功能描述:Broadband Frequency Doubler, 400 - 6000 MHz Output |
| FM-106-PIN | 功能描述:射頻MOSFET電源晶體管 RoHS:否 制造商:Freescale Semiconductor 配置:Single 晶體管極性: 頻率:1800 MHz to 2000 MHz 增益:27 dB 輸出功率:100 W 汲極/源極擊穿電壓: 漏極連續(xù)電流: 閘/源擊穿電壓: 最大工作溫度: 封裝 / 箱體:NI-780-4 封裝:Tray |
| FM106SPT | 制造商:CHENMKO 制造商全稱:Chenmko Enterprise Co. Ltd. 功能描述:FAST RECOVERY RECTIFIER |
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