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參數(shù)資料
| 型號： | MC34118DW |
| 廠商： | Freescale Semiconductor |
| 文件頁數(shù)： | 11/22頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC VOICE SWITCH SPKPHONE 28-SOIC |
| 標準包裝： | 26 |
| 功能： | 語音切換式揚聲電話 |
| 電路數(shù)： | 1 |
| 電源電壓： | 3.5 V ~ 6.5 V |
| 電流 - 電源： | 5.5mA |
| 工作溫度： | -20°C ~ 60°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 28-SOIC（0.295"，7.50mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 28-SOIC W |
| 包裝： | 管件 |
| 包括： | 背景噪聲監(jiān)視器，芯片禁用，撥號音調(diào)檢測器，驅(qū)動器放大器，電平檢測器，麥克風(fēng)放大器，靜音 |
MC34118
MOTOROLA
19
ringer, dialer, and handset functions. The circuit is powered
entirely by the telephone line’s loop current, and its charac-
teristics are shown in Figures 27 -- 30.
Figure 27. DC V--1 Characteristics
0
16
12
8.0
4.0
20
40
60
80
LOOP CURRENT (mA)
20
24
100
120
VOL
TAGE
AT
TIP/RING
(VOL
TS)
Figure 28. AC Termination Impedance
100
600
400
200
0
1.0K
5.0K
FREQUENCY (Hz)
800
1000
Z(
O
HM
S)
AC
600 T
RZac
FIGURE 23
Figure 29. Transmit Gain — Microphone to Tip/Ring
GAIN
(dB)
MCI
GAIN=VLINE/VM
FIGURE 23
VM
100
46
44
40
1.0K
5.0K
48
50
FREQUENCY (Hz)
0.2
5.1 k
T
R
VLINE
600
Figure 30. Receive Gain
GAIN
(dB)
100
24
22
20
1.0K
5.0K
26
28
FREQUENCY (Hz)
500
GAIN=VSPKR/VL
FIGURE 23
VL
T
R
VSPKR
600
Figure 31 shows how the same circuit can be configured to
be powered from a 3.5 -- 6.0 volt power supply rather than
the phone line.
TO
HTO--
TO
FILTER
TO
HTO+
TO VCC
TO CD
(MC34119)
100 F
(NOTE 1)
1. This capacitor must be
physically adjacent to
Pin 4 of the MC34118.
FROM
POWER
SUPPLY
DISABLE
RING
TIP
HOOK
SWITCH
0.01
0.05
300
820
Figure 31. Operating from a Power Supply
+
--
ADDING A DIALER
Figure 32 shows the addition of a dialer to the circuit of Fig-
ure 23, with the additional components shown in bold. The
MC145412 pulse/tone dialer is shown configured for DTMF
operation. The DTMF output (Pin 18) is fed to the hybrid am-
plifiers at HTI, and the DTMF levels at Tip/Ring are adjusted
by varying the 39 k resistor. The Mute Output (active low at
Pin 11) mutes the microphone amplifier, and attenuates the
DTMF signals in the receive path (by means of the 10 k/3.0 k
divider). The MC34118 is forced into the fast idle mode dur-
ing dialing. The 3.0 volt battery provides for memory reten-
tion of the dialer’s 10 number storage when the circuit is
unpowered.
RFI INTERFERENCE
Potential radio frequency interference problems should be
addressed early in the electrical and mechanical design of
the speakerphone. RFI may enter the circuit through Tip and
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