BU8877 [ETC]
Call Progress Tone Decoder for Telephone; 呼叫进程音解码器的电话
| 型号： | BU8877 |
| 厂家： | 
ETC |
| 描述： | Call Progress Tone Decoder for Telephone |
| 文件： | 总3页 (文件大小：104K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
99W121A
Call Progress Tone Decoder for Telephone
BU8877/F
Description
Dimension(Units:mm)
BU8877
The BU8877 and BU8877F are ICs that
detect dial tones from a call progress signal
used in the telephone lines. The ICs detect
dual signals 350Hz(from 345 to 355Hz)and
440Hz(from 435 to 445Hz).
Features
1) No malfunction by voice signal
2) Dual tone detection (350Hz and 440Hz)
3) Wide dynamic range
DIP8
4) 3.58MHz crystal resonator
BU8877F
Applications
Telephone, Codeless telephone and Facsimile for the U.S.
SOP16
Absolute Maximum Ratings (Ta=25˚C)
Parameter
Symbol
VCC
Limits
7
Unit
V
Power supply voltage
*1
*2
800
DIP8
Power
dissipation
Pd
mW
SOP16
300
Operating temperature range
Storage temperature range
Topr
Tstg
-30 ~ +80
˚C
˚C
-55 ~ +125
*1 Derating:8.0mW/˚C for operation above Ta=25˚C
*2 Derating:3.0mW/˚C for operation above Ta=25˚C
Recommended Operating Conditions (Ta=25˚C)
Symbol
VDD
Min.
2.85
Typ.
-
Max.
5.25
Unit
V
Parameter
Power supply voltage
December, 1999
Electrical characteristics (Unless otherwise noted, Ta=25˚C, VDD= 5.0V, Xtal frequency=3.58MHz)
Parameter
Symbol
IDD2-1
Min.
-
Typ.
3.7
-
Max.
5.0
-
Unit
mA
Conditions
Supply current operation 2-1
Minimum input signal level
Maximum input signal level
Must not detect signal level
ENABLE="H"(VDD=5.0V)
Input frequency:
Must detect frequency range
VRECL, VRECH are proportional
to VDD.
VRECL
-38
-
dBm
dBm
dBm
Hz
VRECH
-
2
VREJ
-50
345
435
-
-
-
350Hz fV350
440Hz fV440
Zin
350
440
100
-
355
445
-
Input signal level: 0dBm
Must detect frequency range
Input Impedance
Hz
kW
Input frequency: 100Hz~2000Hz
Call progress tone response time
Call pogress tone de-response time
t
RES
28
28
35
56
56
65
ms
ms
%
t
DRES
-
*
WDU
Detect duty ratio
50
*Detect Duty Ratio which input signal (350Hz+440Hz) burst at 5Hz (Duty Ratio=50%)
Block Diagram
VDD
VSS
VDD
VSS
ENABLE
ENABLE
BPF
(350Hz)
Comparator
Timer
DETECT
VREF
INPUT
AGC
AAF
BPF
(440Hz)
Comparator
XIN
CLOCK
GENERATOR
OSC
VREF
CLOCK
XOUT
BU8877/F
Appendix
Notes
No technical content pages of this document may be reproduced in any form or transmitted by any
means without prior permission of ROHM CO.,LTD.
The contents described herein are subject to change without notice. The specifications for the
product described in this document are for reference only. Upon actual use, therefore, please request
that specifications to be separately delivered.
Application circuit diagrams and circuit constants contained herein are shown as examples of standard
use and operation. Please pay careful attention to the peripheral conditions when designing circuits
and deciding upon circuit constants in the set.
Any data, including, but not limited to application circuit diagrams information, described herein
are intended only as illustrations of such devices and not as the specifications for such devices. ROHM
CO.,LTD. disclaims any warranty that any use of such devices shall be free from infringement of any
third party's intellectual property rights or other proprietary rights, and further, assumes no liability of
whatsoever nature in the event of any such infringement, or arising from or connected with or related
to the use of such devices.
Upon the sale of any such devices, other than for buyer's right to use such devices itself, resell or
otherwise dispose of the same, no express or implied right or license to practice or commercially
exploit any intellectual property rights or other proprietary rights owned or controlled by
ROHM CO., LTD. is granted to any such buyer.
Products listed in this document use silicon as a basic material.
Products listed in this document are no antiradiation design.
The products listed in this document are designed to be used with ordinary electronic equipment or devices
(such as audio visual equipment, office-automation equipment, communications devices, electrical
appliances and electronic toys).
Should you intend to use these products with equipment or devices which require an extremely high level of
reliability and the malfunction of with would directly endanger human life (such as medical instruments,
transportation equipment, aerospace machinery, nuclear-reactor controllers, fuel controllers and other
safety devices), please be sure to consult with our sales representative in advance.
About Export Control Order in Japan
Products described herein are the objects of controlled goods in Annex 1 (Item 16) of Export Trade Control
Order in Japan.
In case of export from Japan, please confirm if it applies to "objective" criteria or an "informed" (by MITI clause)
on the basis of "catch all controls for Non-Proliferation of Weapons of Mass Destruction.
Appendix1-Rev1.0
相关型号：
©2020 ICPDF网 联系我们和版权申明