ANTIOCH, Tennessee Rohm Electronics Division has introduced two linear pulse-code-modulation coder/decoder ICs for cellular telephones. The BU8731KV and the BU8733KV have respective typical operating currents of 8.0 mA and 5.4 mA and standby current of 0.1 microamps.
Both devices include a 14-bit linear or mu-law/A-law codec, an on-board dual-tone modulated frequency (DTMF) and a tone generator.
The internal clock for both ICs is generated from an 8-kHZ frame synchronous signal as part of the PLL unit. The PCM data-transfer clock in the BU8731KV can be adjusted externally between 64 kHz (128 kHz linear) and 2,048 kHz.
The codecs are priced from $3.50 in 1,000-unit quantities.
Call (615) 641-2020
Issue of January 4, 1999; EETInfo No. 603