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| 00W121A T one generator LSI for cellular phones BU8768FV Description The BU8768FV is a tone generator IC for cellular phones that can produce triple chords simultaneously. Tone and volume in each sound source can be controlled separately by serial control. Master volume is integrated. Output can be selected from pseudo sine wave and special square wave. The special square wave is a waveform that can take sound pressure by even a small speaker. Dimension (Units : mm) 5.00.2 16 9 6.40.3 4.40.2 1. 150.1 1 8 0. 1 0.65 0.220. 1 0.3Min. 0. 1 SSOP-B16 Features 1) Three chords are generated by CPU control. 2) Master clock (4.8MHz/3.25MHz) 3) Adjustable parameter needed for generating chords. 4) Built-in DTMF generating function 5) Can select a waveform parameter for generating sound. 6) Control from CPU by serial data 7) Built-in LPF for smoothing 8) SSOP-B16 package Applications Melody sound at receiving or holding a call. December, 2000 0.150. 1 Absolute Maximum Ratings (Ta=25C) Parameter Digital block supply voltage Analog block supply voltage Digital pin applied voltage Analog pin applied voltage Power dissipation Storage temperature range Operating temperature range Symbol DVDD AVDD VDin VAin Pd Tstg Topr Limits --0.3 ~ --0.3 ~ DVSS--0.3 ~ AVSS--0.3 ~ +4.5 +4.5 DVDD+0.3 AVDD+0.3 * Unit V V V V mW 450 --50 ~ +125 --20 ~ +70 C C *Derating : 4mW/C for operation above Ta=25C , (70mmx70mm, t=1.6mm) glass epoxy mounting . Electrical characteristics (Unless otherwise noted; Ta=25C, DVDD=AVDD=3.0V) Parameter Analog block supply voltage Current consumption 1 Current consumption 2 AOUT maximum output (1 sound source) level Load resistance Load capacity Symbol AVDD Idd1 Idd2 Vout Rload Cload Min. 2.7 -- -- 289.0 20 -- Typ. 3.0 -- 1.2 342.5 -- -- Max. 3.6 1.8 2.5 415.4 -- 100 Unit V A mA mVrms k pF Conditions Difference with DVDD: Less than 0.3V Clock stop at sleep mode Operating: ATT123=000, f=986Hz pseudo-sine wave ATT123=000, f=986Hz pseudo-sine wave Block Diagram PRMOD TEST1 TEST2 DGND TEST3 AVDD AGND DVDD 16 15 14 13 12 11 10 9 TEST CIRCUIT WAVE GEN1(h) WAVEFORM GENERATOR WAVE GEN2(m) WAVE GEN3(I) ATT 1 + ATT 1 ATT 3 VOLUME DAC SMOOTHING FILTER CLOCK GENERATOR CONTROL REGISTER BU8768FV 1 MCLK 2 CKSEL 3 SCLK 4 SDATA 5 SSTB 6 RSTB 7 TEST4 8 AOUT |
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