BH2223FV Standard IC 8bit 10ch D/A converter BH2223FV BH2223FV is an 8bit D/A converter for electronic adjustment. The 10-channel DC output voltage 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. The built-in power on reset circuit keeps the output state Low after the power is on and prevents the unstable output state. !Applications The voltage adjustment for DVC, DSC etc. !Features 1) 8bit 10-channel D/A converters adopting R-2R system. 2) 3-wire 12-bit serial interface. 3) POWER ON RESET circuit. 4) The full scale output voltage range : 2.7V∼5.5V. 5) SSOPB16 package. !Absolute maximum ratings (Ta=25°C) Parameter Symbol Limits Power supply voltage VCC −0.3~+7.0 V Maximum output voltage VIN −0.3~VCC V Tstg −55~+125 400 ∗ mW Storage temperature Power dissipation Pd Unit °C ∗Reduced by 4mW 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) Symbol Min. Typ. Max. VCC supply voltage VCC 2.7 − 5.5 V Analog output source current IOL − − 1.0 mA Parameter 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 1/6 BH2223FV Standard IC !Block diagram 3 R-2R DAC AO5 4 R-2R DAC 8bitREG + DEC AO6 5 R-2R DAC 8bitREG + DEC AO7 6 R-2R DAC 8bitREG + DEC AO8 7 R-2R DAC 8bitREG + DEC AO9 8 R-2R DAC 8bitREG + DEC VCC VCC 8bitREG + DEC R-2R DAC 15 AO1 VCC AO4 8bitREG + DEC 14 DI Serial interface 13 CLK POWER_ON RESET 12 LD 11 NC VCC 8bitREG + DEC VCC R-2R DAC 8bitREG + DEC R-2R DAC 10 AO10 VCC 2 VCC AO3 16 GND VCC 8bitREG + DEC VCC R-2R DAC VCC 1 VCC AO2 9 VCC !Pin descriptions Pin No. Pin name In / Out 1 AO2 OUT 2 AO3 OUT 3 AO4 OUT 4 AO5 OUT 5 AO6 OUT 6 AO7 OUT 7 AO8 OUT 8 AO9 OUT Functions Analog output pins 9 VCC − 10 AO10 OUT Analog output pins 11 NC OUT NC 12 LD IN Serial Load input pin 13 CLK IN Serial Clock input pin 14 DI IN Serial Data input pin 15 AO1 OUT Analog output pins 16 GND − Common GND pin Power supply pin 2/6 BH2223FV Standard IC !Electrical characteristics (unless otherwise noted, Ta=25°C, VCC=3.0V, RL=OPEN, CL=0pF) Parameter Symbol Min. Typ. Max. Unit Conditions ICC − 1.1 2.5 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 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 <Operating current> (80H set) VCC system CLK=1MHz <Logic interface> <Buffer amplifier> Minimum output voltage Maximum output voltage <DAC accuracy> !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 Min. trVCC 10 VPOR − Typ. Max. Unit − − ms 1.9 − V Conditions VCC=0→2.7V 3/6 BH2223FV Standard IC (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 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 tCLKL Conditions CL=50pF, RL=10kΩ tCLKH 0.8VCC 0.2VCC CLK DI 0.8VCC 0.2VCC LAST DATA tsDI LD 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 Load conditions Analog output pin RL=10kΩ Measurement point CL=50pF 4/6 BH2223FV Standard IC (3) Command sending Control command is 3wire 12bit 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 D8 D9 D10 D1 D2 D3 D4 D5 D6 D7 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 D11 •Data set Analog output voltage level •Channel select D8 D9 D10 D11 0 0 0 0 Don't Care 0 0 0 1 AO1 0 0 1 0 AO2 0 0 1 1 AO3 0 1 0 0 AO4 0 1 0 1 AO5 0 1 1 0 AO6 0 1 1 1 AO7 1 0 0 0 AO8 1 0 0 1 AO9 1 0 1 0 AO10 1 0 1 1 Don't Care 1 1 0 0 Don't Care 1 1 0 1 Don't Care 1 1 1 0 Don't Care 1 1 1 1 Don't Care Adress select 5/6 BH2223FV Standard IC !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) 5.0±0.2 9 1 8 1.15±0.1 0.1 6.4±0.3 4.4±0.2 0.3Min. 16 0.65 0.15±0.1 0.1 0.22±0.1 SSOP-B16 6/6