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 : 2.7V∼5.5V. 5) MSOP8 package. !Absolute maximum ratings (Ta=25°C) Parameter Symbol Limits Unit Power supply voltage VCC −0.3~+7.0 V Maximum output voltage VIN −0.3~VCC V Tstg −55~+125 310 ∗ mW Storage temperature Power dissipation Pd °C ∗Reduced by 3.1mW for each increase in Ta of 1°C over 25°C. This product is not designed for protection against radioactive rays. !Recommended operating conditions (Ta=25°C) Parameter Symbol Min. Typ. Max. VCC supply voltage VCC 2.7 − 5.5 V Analog output source current IOL − − 1.0 mA Analog output sink current Operating temperature range Clock frequency Limit load capacitance Unit IOH − − 1.0 mA Topr −20 − 85 °C FSCLK − 1.0 − MHz CL − − 0.1 µF 1/5 BH2220FVM Standard IC !Block diagram 2 R-2R DAC AO3 3 R-2R DAC VCC 4 VCC VCC AO2 8bitREG + DEC 8bitREG + DEC VCC 8bitREG + DEC R-2R DAC AO1 1 Serial Interface 8 LD 7 CLK 6 DI 5 GND Power on reset 2/5 BH2220FVM Standard IC !Pin descriptions Pin No. Symbol In / Out 1 AO1 OUT Description 2 AO2 OUT 3 AO3 OUT 4 VCC − Power supply pin Analog output pins 5 GND − Common GND pin 6 DI IN Serial Data input pin 7 CLK IN Serial Clock input pin 8 LD IN Serial Load input pin !Electrical characteristics (unless otherwise noted, Ta=25°C, VCC=3.0V, RL=OPEN, CL=0pF) Parameter Symbol Min. Typ. Max. Unit Conditions ICC − 0.4 0.8 mA Input low voltage VIL GND − 0.2VCC V Input high voltage VIH 0.8VCC − VCC V Input low current IIL − − 10 µA Input high current IIH − − 10 µA ZS1 GND − 0.1 V 00H set IOH=0.0mA ZS2 GND − 0.2 V 00H set IOH=0.5mA ZS3 GND − 0.3 V 00H set IOH=1.0mA FS1 VCC −0.1 − VCC V FFH set IOL=0.0mA FS2 VCC −0.2 − VCC V FFH set IOL=0.5mA FS3 VCC −0.3 − VCC V FFH set IOL=1.0mA <Operating current> (80H set) VCC system CLK=1MHz <Logic interface> <Buffer amplifier> Minimum output voltage Maximum output voltage <DAC accuracy> Resolution RES − 8 − bit Differential nonlinearity error DNL −1.0 − 1.0 LSB Input code 02H~FDH Nonlinearity error INL −1.5 − 1.5 LSB Input code 02H~FDH 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. Symbol Min. Typ. Max. Unit VCC supply voltage rise time Parameter TrVCC 10 − − ms Power on reset voltage VPOR − 1.9 − V Conditions VCC=0→2.7V (2) Conditions of operating timing (unless otherwise noted, Ta=25°C, VCC=3.0V) Symbol Min. Typ. Max. Unit CLK L level pulse width tCLKL 200 − − ns CLK H level pulse width tCLKH 200 − − ns tsDI 30 − − ns Parameter DI setup time Conditions DI hold time thDI 60 − − ns LD setup time tsLD 200 − − ns LD hold time thLD 100 − − ns LD "H" level pulse width tLDH 100 − − ns Analog output delay time tOUT − − 300 µs CL=50pF, RL=10kΩ − − 100 µs CL=50pF, RL=0.5MΩ tCLKL tCLKH 0.8VCC 0.2VCC CLK DI tsDI LD 0.8VCC 0.2VCC LAST DATA thDI tLDH tsLD thLD 0.8VCC 0.2VCC 0.8VCC 0.2VCC OUTPUT tOUT ∗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) MSB (FIRST) Data set D0 Channel select D1 D2 D3 D4 D5 D6 D7 D8 D9 D0 D1 D2 D3 D4 D5 D6 D7 0 0 0 0 0 0 0 0 GND 1 0 0 0 0 0 0 0 (VCC-GND) / 256×1 0 1 0 0 0 0 0 0 (VCC-GND) / 256×2 1 1 0 0 0 0 0 0 (VCC-GND) / 256×3 0 0 1 0 0 0 0 0 (VCC-GND) / 256×4 0 1 1 1 1 1 1 1 (VCC-GND) / 256×254 1 1 1 1 1 1 1 1 (VCC-GND) / 256×255 •Data set Analog output voltage level •Channel select D8 D9 0 0 AO1 Adress select 1 0 AO2 0 1 AO3 1 1 Don't Care !Operation notes (1) Regarding to the DNL & INL This item is guaranteed under below condition. Input code 02H∼FDH (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) 5 1 4 0.29±0.15 0.6±0.2 8 2.8±0.1 4.0±0.2 2.9±0.1 +0.05 0.145−0.03 0.9Max. 0.75±0.05 0.08±0.05 0.475 0.22 0.65 +0.05 −0.04 0.08 M 0.08 S MSOP8 5/5