MAX525 19-1098 Rev 2 10/02 Low-Power, Quad, 12-Bit Voltage-Output DAC with Serial Interface General Description Features The MAX525 combines four low-power, voltage-output, Four 12-Bit DACs with Configurable 12-bit digital-to-analog converters (DACs) and four pre- Output Amplifiers cision output amplifiers in a space-saving, 20-pin pack- +5V Single-Supply Operation age. In addition to the four voltage outputs, each Low Supply Current: 0.85mA Normal Operation amplifiers negative input is also available to the user. This facilitates specific gain configurations, remote 10A Shutdown Mode sensing, and high output drive capacity, making the Available in 20-Pin SSOP MAX525 ideal for industrial-process-control applica- Power-On Reset Clears all Registers and tions. Other features include software shutdown, hard- DACs to Zero ware shutdown lockout, an active-low reset which clears all registers and DACs to zero, a user-programmable Capable of Recalling Last State Prior to Shutdown logic output, and a serial-data output. SPI/QSPI and MICROWIRE Compatible Each DAC has a double-buffered input organized as an Simultaneous or Independent Control of DACs input register followed by a DAC register. A 16-bit serial through 3-Wire Serial Interface word loads data into each input/DAC register. The serial interface is compatible with SPI/QSPI and User-Programmable Digital Output MICROWIRE. It allows the input and DAC registers to be updated independently or simultaneously with a sin- Ordering Information gle software command. The DAC registers can be simultaneously updated through the 3-wire serial inter- INL PART TEMP RANGE PIN-PACKAGE face. All logic inputs are TTL/CMOS-logic compatible. (LSB) MAX525ACPP 0C to +70C 20 Plastic DIP 1/2 Applications MAX525BCPP 0C to +70C 20 Plastic DIP 1 Industrial Process Controls MAX525ACAP 0C to +70C 20 SSOP 1/2 Automatic Test Equipment MAX525BCAP 0C to +70C 20 SSOP 1 Digital Offset and Gain Adjustment Ordering Information continued at end of data sheet. Motion Control Remote Industrial Controls Pin Configuration appears at end of data sheet. Microprocessor-Controlled Systems Functional Diagram V DOUT REFAB CL PDL DGND AGND DD FBA DECODE MAX525 CONTROL OUTA INPUT DAC DAC A REGISTER A REGISTER A FBB OUTB INPUT DAC 16-BIT DAC B REGISTER B REGISTER B SHIFT FBC REGISTER OUTC INPUT DAC DAC C REGISTER C REGISTER C FBD OUTD SR INPUT DAC LOGIC DAC D CONTROL REGISTER D REGISTER D OUTPUT CS DIN SCLK UPO REFCD SPI and QSPI are trademarks of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corp. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.Low-Power, Quad, 12-Bit Voltage-Output DAC with Serial Interface ABSOLUTE MAXIMUM RATINGS V to AGND............................................................-0.3V to +6V Operating Temperature Ranges DD V to DGND ...........................................................-0.3V to +6V MAX525 C P ........................................................0C to +70C DD AGND to DGND..................................................................0.3V MAX525 E P .....................................................-40C to +85C REFAB, REFCD to AGND...........................-0.3V to (V + 0.3V) MAX525 MJP ..................................................-55C to +125C DD OUT , FB to AGND...................................-0.3V to (V + 0.3V) Storage Temperature Range .............................-65C to +150C DD Digital Inputs to DGND.............................................-0.3V to +6V Lead Temperature (soldering, 10s) .................................+300C DOUT, UPO to DGND ................................-0.3V to (V + 0.3V) DD Continuous Current into Any Pin.......................................20mA Continuous Power Dissipation (T = +70C) A Plastic DIP (derate 8.00mW/C above +70C) .................640mW SSOP (derate 8.00mW/C above +70C) ......................640mW CERDIP (derate 11.11mW/C above +70C).................889mW Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS (V = +5V 10%, AGND = DGND = 0V, REFAB = REFCD = 2.5V, R = 5k , C = 100pF, T = T to T , unless otherwise DD L L A MIN MAX noted. Typical values are at T = +25C. Output buffer connected in unity-gain configuration (Figure 9).) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS STATIC PERFORMANCEANALOG SECTION Resolution N 12 Bits MAX525A 0.25 0.5 Integral Nonlinearity INL LSB (Note 1) MAX525B 1.0 Differential Nonlinearity DNL Guaranteed monotonic 1.0 LSB Offset Error V 6.0 mV OS Offset-Error Tempco 6 ppm/C Gain Error GE (Note 1) -0.8 2.0 LSB Gain-Error Tempco 1 ppm/C Power-Supply Rejection Ratio PSRR 4.5V V 5.5V 100 600 V/V DD MATCHING PERFORMANCE (T = +25C) A Gain Error GE -0.8 2.0 LSB Offset Error 1.0 6.0 mV Integral Nonlinearity INL 0.35 1.0 LSB REFERENCE INPUT Reference Input Range V 0V - 1.4 V DD REF Reference Input Resistance R Code-dependent, minimum at code 555 hex 8 k REF Reference Current in Shutdown 0.01 1 A 2 MAX525