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MAX5188 Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX5188 Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 16 page Dual, 8-Bit, 40MHz, Current/Voltage, Alternate-Phase Output DACs _______________________________________________________________________________________ 9 External Reference To disable the MAX5188/MAX5191’s internal reference, connect REN to DVDD. A temperature-stable external reference may now be applied to drive the REFO pin (Figure 3) to set the full-scale output. Choose a refer- ence that can supply at least 150µA to drive the bias circuit that generates the cascode current for the cur- rent array. For improved accuracy and drift perfor- mance, choose a fixed output voltage reference such as the +1.2V, 25ppm/°C MAX6520 bandgap reference. Standby Mode To enter the lower-power standby mode, connect digi- tal inputs PD and DACEN to DGND. In standby, both the reference and the control amplifier are active with the current array inactive. To exit this condition, DACEN must be pulled high with PD held at DGND. The MAX5188/MAX5191 typically require 50µs to wake up and allow both the outputs and the reference to settle. Shutdown Mode For lowest power consumption, the MAX5188/MAX5191 provide a power-down mode in which the reference, control amplifier, and current array are inactive and the DAC’s supply current is reduced to 1µA. To enter this mode, connect PD to DVDD. To return to active mode, connect PD to DGND and DACEN to DVDD. About 50µs are required for the devices to leave shutdown mode and settle their outputs to the values prior to shutdown. Table 1 lists the power-down mode selection. RSET** 9.6k IFS RSET CCOMP* REFR IREF REFO MAX4040 +1.2V BANDGAP REFERENCE CURRENT- SOURCE ARRAY *COMPENSATION CAPACITOR (CCOMP = 100nF) **9.6k Ω REFERENCE CURRENT SET RESISTOR INTERNAL TO MAX5191 ONLY. USE EXTERNAL RSET FOR MAX5188. OPTIONAL EXTERNAL BUFFER FOR HEAVIER LOADS REN MAX5188 MAX5191 IREF = VREF RSET AGND AGND DGND Figure 2. Setting IFS with the Internal +1.2V Reference and Control Amplifier Table 1. Power-Down Mode Selection X = Don’t care MAX5191 MAX5188 MAX5191 MAX5188 1 X Shutdown AGND 0 0 Standby AGND PD (POWER-DOWN SELECT) DACEN (DAC ENABLE) POWER-DOWN MODE OUTPUT STATE High-Z 0 1 Wake-Up Last state prior to standby mode High-Z |
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