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參數(shù)資料
| 型號(hào)： | FM1062A |
| 英文描述： | Low Voltage Transmission Circuit |
| 中文描述： | 低壓輸電線路 |
| 文件頁(yè)數(shù)： | 3/6頁(yè) |
| 文件大?。?/td> | 102K |
| 代理商： | FM1062A |
transducer in use. The gain is proportional to the value of R7 which is connected between GAS1
and GAS2.
Input MUTE (FM1062)
When MUTE is HIGH the DTMF input is enabled and the microphone and receiving amplifier
inputs are inhibited. The reverse is true when MUTE is LOW or open-circuit. MUTE switching
causes only negligible clicking on the line and earpiece output. If the number of parallel sets in use
causes a drop in line current to below 6 mA the speech amplifiers remain active independent to the
DC level applied to the MUTE input.
Input MUTE (FM1062A)
When MUTE is LOW or open-circuit, the DTMF input is enabled and the microphone and
receiving amplifier inputs are inhibited. The reverse is true when MUTE is HIGH. MUTE switching
causes only negligible clicking on the line and earpiece output. If the number of parallel sets in use
causes a drop in line current to below 6 mA the DTMF amplifier becomes active independent to the
DC level applied to the MUTE input.
Dual-tone multi-frequency input DTMF
When the DTMF input is enabled dialling tones may be sent on to the line. The voltage gain
from DTMF to LN is typically 25.5 dB (when R7 = 68 k
) and varies with R7 in the same way as the
microphone gain. The signalling tones can be heard in the earpiece at a low level (confidence tone).
Receiving amplifier IR, QR and GAR
The receiving amplifier has one input (IR) and a non-inverting output (QR). The IR to QR gain is
typically 31 dB (when R4 = 100 k
). It can be adjusted between 20 and 31 dB to match the
sensitivity of the transducer in use. The gain is set with the value of R4 which is connected between
GAR and QR. The overall receive gain, between LN and QR, is calculated by subtracting the anti-
sidetone network attenuation (32 dB) from the amplifier gain. The output voltage of the receiving
amplifier is specified for continuous-wave drive. The maximum output voltage will be higher under
speech conditions where the peak to RMS ratio is higher.
Automatic Gain Control input AGC
Automatic line loss compensation is achieved by connecting a resistor (R6) between AGC and
V
EE
. The automatic gain control varies the gain of the microphone amplifier and the receiving
amplifier in accordance with the DC line current. The control range is 5.8 dB which corresponds to a
line length of 5 km for a 0.5 mm diameter twisted-pair copper cable with a DC resistance of 176
/km and average attenuation of 1.2 dB/km). Resistor R6 should be chosen in accordance with the
exchange supply voltage and its feeding bridge resistance. The ratio of start and stop currents of
the AGC curve is independent of the value of R6. If no automatic line-loss compensation is required
the AGC pin may be left open-circuit. The amplifiers, in this condition, will give their maximum
specified gain.
Enhanced EMC performance
The input pins FM1062 / FM1062A are added RC filters to improve the EMC performance, so
the telephone sets which used FM1062 / FM1062A are easily to handle the EMC design.
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