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U3750BM 参数 Datasheet PDF下载

U3750BM图片预览
型号: U3750BM
PDF下载: 下载PDF文件 查看货源
内容描述: 单芯片电话线路 [One Chip Telephone Circuit]
分类和应用: 电信电路电话电路
文件页数/大小: 20 页 / 206 K
品牌: TEMIC [ TEMIC SEMICONDUCTORS ]
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U3750BM  
TELEFUNKEN Semiconductors  
Parameters  
Test Conditions / Pins  
Symbol  
Min.  
Typ.  
Max.  
Unit  
DTMF generation Pin 4 grounded  
Tone frequency accuracy  
(confidence tone included)  
Low group tone level  
(depends on external  
components)  
V
= 3.5 V  
–0.4  
–10  
+0.25  
–6  
%
RAM  
(Note 2)  
Measured on 600  
I = 28 mA  
L
–8  
–6  
2
dBm  
figure 3  
High group tone level  
(depends on external  
components)  
(Note 2)  
Measured on 600  
I = 28 mA  
L
–8  
1
–4  
3
dBm  
dB  
figure 3  
Preemphasis (depends on  
external components)  
(Note 2)  
Measured on 600  
I = 28 mA  
L
figure 3  
DTMF distortion (depends (Note 2 and note 3)  
on external components)  
Measured on 600  
3.5  
%
I = 28 mA,  
L
300 < f < 3400 Hz  
figure 3  
DTMF transmission time  
DTMF interdigit time  
t
80.2  
89.2  
82.4  
89.2  
ms  
ms  
MF  
t
IMF  
Transmission mute tm  
Confidence tone  
FCT frequency  
Tone level (depends on  
external components)  
169.4  
171.6  
ms  
MF  
Only by serial bus  
Measured on 600  
440.9  
–9  
Hz  
dBm  
I = 25 mA  
L
figure 3  
Note 1: sending gain: G = V /V with the values of  
S
L
MI  
R
AG1  
and R  
(figure 3) so the maximum gain  
AG2  
is at 28 mA and the minimum gain is at 60 mA.  
Note 2: For DTMF measurements, close switches S1 and  
S3 and select each group of frequencies on the  
keyboard.  
Note 3: The level of each harmonic on line is under the  
limited curve given below with the filter compo-  
nents value chosen for the test.  
Figure 1  
Rev. A1: 16.07.1996  
7 (20)