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| BH2220FVM Standard IC 8bit 3ch D/A converter BH2220FVM BH2220FVM is 8bit 3 channel D/A converter for electronic adjustment. The 3-channel DC output can be independently controlled by three-wire serial interface from micro-controller. The D/A converter can generate without loss by Rail to Rail output within the setting voltage. This small MSOP8 package is suitable for portable appliances. !Applications The voltage adjustment for DVC, DSC etc. !Features 1) 8bit 3-channel D/A converters adopting R-2R system. 2) 3-wire 10-bit serial interface. 3) POWER ON RESET circuit. 4) The full scale output voltage range : 2.7V5.5V. 5) MSOP8 package. !Absolute maximum ratings (Ta=25C) Parameter Power supply voltage Maximum output voltage Storage temperature Power dissipation Symbol VCC VIN Tstg Pd Limits -0.3~+7.0 -0.3~VCC -55~+125 310 Unit V V C mW Reduced by 3.1mW for each increase in Ta of 1C over 25C. This product is not designed for protection against radioactive rays. !Recommended operating conditions (Ta=25C) Parameter VCC supply voltage Analog output source current Analog output sink current Operating temperature range Clock frequency Limit load capacitance Symbol VCC IOL IOH Topr FSCLK CL Min. 2.7 - - -20 - - Typ. - - - - 1.0 - Max. 5.5 1.0 1.0 85 - 0.1 Unit V mA mA C MHz F 1/5 BH2220FVM Standard IC !Block diagram AO1 1 VCC R-2R DAC 8bitREG + DEC 8 VCC Serial Interface LD VCC AO2 2 3 4 R-2R DAC 8bitREG + DEC 8bitREG + DEC 7 6 CLK AO3 R-2R DAC DI VCC 5 GND Power on reset 2/5 BH2220FVM Standard IC !Pin descriptions Pin No. 1 2 3 4 5 6 7 8 Symbol AO1 AO2 AO3 VCC GND DI CLK LD In / Out OUT OUT OUT - - IN IN IN Power supply pin Common GND pin Serial Data input pin Serial Clock input pin Serial Load input pin Description Analog output pins !Electrical characteristics (unless otherwise noted, Ta=25C, VCC=3.0V, RL=OPEN, CL=0pF) Parameter 3/5 BH2220FVM Standard IC !Circuit operation (1) Power on reset This LSI has a power on reset circuit that sets an analog output to low level in VCC power stand-up. Please be sure that the time constant meets below condition, because the output is undefined when VCC power stand up too rapidly. Parameter VCC supply voltage rise time Power on reset voltage Symbol TrVCC VPOR Min. 10 - Typ. - 1.9 Max. - - Unit ms V VCC=02.7V Conditions (2) Conditions of operating timing (unless otherwise noted, Ta=25C, VCC=3.0V) Parameter CLK L level pulse width CLK H level pulse width DI setup time DI hold time LD setup time LD hold time LD "H" level pulse width Analog output delay time Symbol tCLKL tCLKH tsDI thDI tsLD thLD tLDH tOUT Min. 200 200 30 60 200 100 100 - - Typ. - - - - - - - - - Max. - - - - - - - 300 100 Unit ns ns ns ns ns ns ns s s CL=50pF, RL=10k CL=50pF, RL=0.5M Conditions tCLKL tCLKH 0.8VCC 0.2VCC CLK DI LAST DATA 0.8VCC 0.2VCC tsDI thDI tLDH tsLD thLD 0.8VCC 0.2VCC LD OUTPUT tOUT 0.8VCC 0.2VCC A signal level is judged at 80% or 20% of VCC 4/5 BH2220FVM Standard IC (3) Command sending Control command is 3wire 10bit serial interface. (MSB first) Data is taken in with the rise edge of the CLK and output data is fixed in the LD high section. Data is maintained in the LD low section. LSB (LAST) Data set D0 D1 D2 D3 D4 D5 D6 D7 MSB (FIRST) Channel select D8 D9 *Data set D0 0 1 0 1 0 D1 0 0 1 1 0 D2 0 0 0 0 1 D3 0 0 0 0 0 D4 0 0 0 0 0 D5 0 0 0 0 0 D6 0 0 0 0 0 D7 0 0 0 0 0 GND (VCC-GND) / 256x1 (VCC-GND) / 256x2 (VCC-GND) / 256x3 (VCC-GND) / 256x4 Analog output voltage level 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 (VCC-GND) / 256x254 (VCC-GND) / 256x255 *Channel select D8 0 1 0 1 D9 0 0 1 1 AO1 AO2 AO3 Don't Care Adress select !Operation notes (1) Regarding to the DNL & INL This item is guaranteed under below condition. Input code 02HFDH (2) Regarding to the power on reset function This function operates detecting the voltage level of the VCC. So, if the voltage level of the VCC become less than power on reset voltage when working, it is a possibility that the outputs become reset condition. !External dimensions (Units : mm) 2.90.1 8 5 4.00.2 2.80.1 1 4 0.475 0.9Max. 0.750.05 0.080.05 0.22 0.65 +0.05 -0.04 0.290.15 0.60.2 +0.05 0.145-0.03 0.08 M 0.08 S MSOP8 5/5 |
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