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參數(shù)資料
| 型號(hào)： | MC34118DW |
| 廠商： | Freescale Semiconductor |
| 文件頁(yè)數(shù)： | 13/22頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC VOICE SWITCH SPKPHONE 28-SOIC |
| 標(biāo)準(zhǔn)包裝： | 26 |
| 功能： | 語(yǔ)音切換式揚(yáng)聲電話(huà) |
| 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(lèi)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(hào)音調(diào)檢測(cè)器，驅(qū)動(dòng)器放大器，電平檢測(cè)器，麥克風(fēng)放大器，靜音 |
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MC34118
MOTOROLA
20
Ring, through the microphone wiring to the microphone am-
plifier, or through any of the PC board traces. The most sen-
sitive pins on the MC34118 are the inputs to the level
detectors (RLI1, RLI2, TLI1, TLI2) since, when there is no
speech present, the inputs are high impedance and these op
amps are in a near open loop condition. The board traces to
these pins should be kept short, and the resistor and capaci-
tor for each of these pins should be physically close to the
pins. Any other high impedance input pin (MCI, HTI, FI, VLC)
should be considered sensitive to RFI signals.
IN THE FINAL ANALYSIS . . .
Proper operation of a speakerphone is a combination of
proper mechanical (acoustic) design as well as proper elec-
tronic design. The acoustics of the enclosure must be con-
sidered early in the design of a speakerphone. In general,
electronics cannot compensate for poor acoustics, low
speaker quality, or any combination of the two. Proper
acoustic separation of the speaker and microphone, as de-
scribed in the Design Equations, is essential. The physical
location of the microphone, along with the characteristics of
the selected microphone, will play a large role in the quality
of the transmitted sound. The microphone and speaker ven-
dors can usually provide additional information on the use of
their products.
In the final analysis, the circuits shown in this data sheet
will have to be “fine tuned” to match the acoustics of the en-
closure, the specific hybrid, and the specific microphone and
speaker selected. The component values shown in this data
sheet should be considered as starting points only. The gains
of the transmit and receive paths are easily adjusted at the
microphone and speaker amplifiers, respectively. The
switching response can then be fine tuned by varying (in
small steps) the components at the level detector inputs until
satisfactory operation is obtained for both long and short
lines.
SUGGESTED VENDORS
Microphones
Primo Microphones Inc.
MURA Corp.
Bensenville, IL 60106
Westbury, N.Y. 11590
312--595--1022
516--935--3640
Model EM--60
Model EC--983--7
Hosiden America Corp.
Elk Grove Village, IL 60007
312--981--1144
Model KUC2123
25 Speakers
Panasonic Industrial Co.
Seacaucus, N.J. 07094
201--348--5233
Model EAS--45P19S
Telecom Transformers
Microtran Co., Inc.
Stancor Products
Valley Stream, N.Y. 11528
Logansport, IN 46947
516--561--6050
219--722--2244
Various models — ask for
catalog and Application
catalog
Bulletin F232
PREM Magnetics, Inc.
Onan Power/Electronics
McHenry, IL 60050
Minneapolis, MN 55437
815--385--2700
612--921--5600
Various models — ask for
Model TC 38--6
catalog
Motorola Inc. does not endorse or warrant the suppliers
referenced.
D
#
0
*
C
9
8
7
B
6
5
4
A
3
2
1
+
--
+
--
16
15
14
13
2
5
4
3
18
1
8
9
11
10
12
6
TO TIP
&RING
10 k
3.0 k
0.1
51 k
10 k
0.05
0.01
300
820
2N2222A
OR EQUIVALENT
MUTE
VCC
27 k
240 k
3300
56 k
180 k
0.1
2.0 k
VCC
TXO
HTI
HTO--
12
1
MUT
FO
3.58
MHz
2
5
HTO+
FI
VB
R
FILTER
4700 pF
VB
R
4
87
6
3.0 V
MC145412
0.1
39 k
Figure 32. Adding a Dialer to the Speakerphone
+1
MC34118
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MC34118-E28-T | 制造商:UTC-IC 制造商全稱(chēng):UTC-IC 功能描述:VOICE SWITCHED SPEAKER-PHONE CIRCUIT |
| MC34118EG | 制造商:Rochester Electronics LLC 功能描述: |
| MC34118G-D28-T | 制造商:UTC-IC 制造商全稱(chēng):UTC-IC 功能描述:VOICE SWITCHED SPEAKER-PHONE CIRCUIT |
| MC34118G-E28-T | 制造商:UTC-IC 制造商全稱(chēng):UTC-IC 功能描述:VOICE SWITCHED SPEAKER-PHONE CIRCUIT |
| MC34118G-S28-R | 制造商:UTC-IC 制造商全稱(chēng):UTC-IC 功能描述:VOICE SWITCHED SPEAKER-PHONE CIRCUIT |
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