Communication ICs PCM codec IC for digital cellular telephones BU8731KV The BU8731KV is a PCM codec IC developed for use with digital cellular telephones. It contains analog input / output features such as a 14-bit linear precision, / A-LAW codec, mic and speaker amplifiers, and switching transistor for the ringer drive. This all makes the BU8731KV perfect for PDC and CDMA-type cellular telephones. Applications Digital cellular telephones Features 1) 3V single power supply (VDD = 2.7V to 3.3V). 2) Built-in 14-bit precision linear, / A-LAW codec. 3) Transmission filter for the codec unit conforms to ITU-T recommendations. 4) Built-in PLL circuit for system clock generation. 5) Clock frequency for PCM data transmission can be set anywhere between 64kHz (128kHz when linear) to 2048kHz. 6) Analog input / output functions: Built-in mic amplifier. Built-in receiver speaker amplifier (32 BTL type). Built-in earphone speaker amplifier (32 single type). Absolute maximum ratings (Ta = 25C) 610 Built-in drive amplifier for reception REXT (600). Built-in electronic volume control for gain adjustment (for reception, transmission, and tone). Data signal I / O circuit allows for connection to external devices. For the REXT output and earphone output, softmute function reduces pop noise when the power is turned on and off. 7) DTMF signal and scale tone signal generator functions are built into the tone signal generator block. 8) Internal switching transistor for ringer drive. 9) VQFP 48-pin package. Communication ICs BU8731KV Recommended operating conditions (Ta = 25C) Block diagram 611 Communication ICs Pin descriptions 612 BU8731KV Communication ICs BU8731KV 613 Communication ICs BU8731KV Electrical characteristics (unless otherwise noted, Ta = 25C, DVDD = RXVDD = TXVDD = 3.0V, FSYNC = 8kHz) 614 Communication ICs BU8731KV Electrical characteristics (unless otherwise noted, Ta = 25C, DVDD = RXVDD = TXVDD = 3.0V, FSYNC = 8kHz, FElectrical characteristics (gain of each attenuator = 0dB) 615 Communication ICs 616 BU8731KV Communication ICs BU8731KV 617 Communication ICs Digital AC characteristics 618 BU8731KV Communication ICs BU8731KV Measurement circuit 619 Communication ICs External dimensions (Units: mm) 620 BU8731KV 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