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99W121A
Call Progress Tone Decoder for Telephone
BU8877/F
Description 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).
Dimension(Units:mm)
BU8877
Features 1) No malfunction by voice signal 2) Dual tone detection (350Hz and 440Hz) 3) Wide dynamic range 4) 3.58MHz crystal resonator
BU8877F
DIP8
Applications Telephone, Codeless telephone and Facsimile for the U.S.
SOP16
Absolute Maximum Ratings (Ta=25C)
Parameter Power supply voltage Power dissipation DIP8 SOP16 Symbol VCC Pd Topr Tstg Limits 7 800 300
*1 *2
Unit V mW C C
Operating temperature range Storage temperature range
-30 ~ +80 -55 ~ +125
*1 Derating:8.0mW/C for operation above Ta=25C *2 Derating:3.0mW/C for operation above Ta=25C
Recommended Operating Conditions (Ta=25C)
Parameter Power supply voltage Symbol VDD Min. 2.85 Typ. Max. 5.25 Unit V
December, 1999
Electrical characteristics
Parameter Supply current operation 2-1 Minimum input signal level Maximum input signal level Must not detect signal level Must detect frequency range Input Impedance
(Unless otherwise noted, Ta=25C, VDD= 5.0V, Xtal frequency=3.58MHz) Symbol IDD2-1 VRECL VRECH VREJ 350Hz 440Hz fV350 fV440 Zin Min. -38 -50 345 435 28 28 35 Typ. 3.7 350 440 100 50 Max. 5.0 2 355 445 56 56 65 Unit mA dBm dBm dBm Hz Hz k ms ms % Conditions ENABLE="H"(VDD=5.0V) Input frequency: Must detect frequency range VRECL, VRECH are proportional to VDD. Input signal level: 0dBm Input frequency: 100Hz~2000Hz
Call progress tone response time Call pogress tone de-response time Detect duty ratio
*
tRES tDRES
WDU
*Detect Duty Ratio which input signal (350Hz+440Hz) burst at 5Hz (Duty Ratio=50%)
Block Diagram
VDD VSS ENABLE
VDD VSS ENABLE
BPF (350Hz)
Comparator
INPUT
AGC
AAF
BPF (440Hz)
Comparator
Timer
DETECT
XIN OSC XOUT
CLOCK GENERATOR
CLOCK
VREF
VREF
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

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