MAX5120/MAX5121 19-1428 Rev 0 2/99 +3V/+5V, 12-Bit, Serial Voltage-Output DACs with Internal Reference General Description Features The MAX5120/MAX5121 are low-power, 12-bit, voltage- Single-Supply Operation output digital-to-analog converters (DACs) with an inter- +5V (MAX5120) nal precision bandgap reference and an output amplifier. +3V (MAX5121) The MAX5120 operates on a +5V supply with an internal amplifier reference of +2.5V and is capable of a +4.095V Full-Scale Output Range full-scale output range. The MAX5121, operating on +3V, +4.095V (MAX5120) delivers its +2.0475V full-scale output with an internal +2.0475V (MAX5121) precision reference of +1.25V. If necessary, the user can override the internal, <10ppm/C voltage reference with Built-In 10ppm/C (max) Precision Bandgap an external reference. Both devices draw only 500A of Reference supply current, which reduces to 3A in power-down +2.5V (MAX5120) mode. In addition, their power-up reset feature allows for +1.25V (MAX5121) a user-selectable initial output state of either 0V or mid- scale and minimizes output voltage glitches during Adjustable Output Offset power-up. SPI/QSPI/MICROWIRE-Compatible, 3-Wire Serial The serial interface is compatible with SPI, QSPI Interface and MICROWIRE, which makes the MAX5120/ MAX5121 suitable for cascading multiple devices. Each Pin-Programmable Shutdown Mode and Power- DAC has a double-buffered input organized as an input Up Reset (0V or Midscale Output Voltage) register followed by a DAC register. A 16-bit shift regis- ter loads data into the input register. The DAC register Buffered Output Capable of Driving 5k 100pF may be updated independently or simultaneously with or 420mA Loads the input register. Space-Saving 16-Pin QSOP Package Both devices are available in a 16-pin QSOP package and are specified for the extended industrial (-40C to Pin-Compatible 13-Bit Upgrades Available +85C) temperature range. For pin-compatible 14-bit (MAX5130/MAX5131) upgrades, see the MAX5170/MAX5172 data sheet for pin-compatible 13-bit versions, see the MAX5130/ Pin-Compatible 14-Bit Upgrades Available MAX5131 data sheet. (MAX5170/MAX5172) Applications Industrial Process Controls Automatic Test Equipment (ATE) Digital Offset and Gain Adjustment Motion Control P-Controlled Systems Pin Configuration Ordering Information PIN- INL TOP VIEW PART TEMP. RANGE PACKAGE (LSB) OS 1 16 V DD MAX5120AEEE -40C to +85C 16 QSOP 0.5 OUT 2 15 REFADJ MAX5120BEEE -40C to +85C 16 QSOP 1 RSTVAL 3 14 REF MAX5121AEEE -40C to +85C 16 QSOP 1 MAX5120 PDL 4 13 AGND MAX5121BEEE -40C to +85C 16 QSOP 2 MAX5121 CLR 5 12 PD CS 6 11 UPO DIN 7 10 DOUT SCLK 8 9 DGND SPI and QSPI are trademarks of Motorola, Inc. QSOP MICROWIRE is a trademark of National Semiconductor Corp. Maxim Integrated Products 1 For free samples & the latest literature: +3V/+5V, 12-Bit, Serial Voltage-Output DACs with Internal Reference ABSOLUTE MAXIMUM RATINGS V to AGND, DGND...............................................-0.3V to +6V Maximum Current into Any Pin............................................50mA DD AGND to DGND.....................................................-0.3V to +0.3V Continuous Power Dissipation (T = +70C) A Digital Inputs to DGND.............................................-0.3V to +6V QSOP (derate 8.00mW/C above +70C).....................667mW Digital Outputs (DOUT, UPO) to DGND.....-0.3V to (V + 0.3V) Operating Temperature Range ..........................-40C to +85C DD OUT to AGND.............................................-0.3V to (V + 0.3V) Storage Temperature Range .............................-65C to +150C DD OS to AGND ...................................(AGND - 4V) to (V + 0.3V) Lead Temperature (soldering, 10sec) .............................+300C DD REF, REFADJ to AGND ..............................-0.3V to (V + 0.3V) DD 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 CHARACTERISTICSMAX5120 (+5V) (V = +5V 10%, OS = AGND = DGND = 0V, 33nF capacitor at REFADJ, internal reference, R = 5k, C = 100pF, T = T to DD L L A MIN T , unless otherwise noted. Typical values are at T = +25C.) MAX A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS STATIC PERFORMANCE Resolution N 12 Bits MAX5120A -0.5 0.5 Integral Nonlinearity (Note 1) INL LSB MAX5120B -1 1 Differential Nonlinearity DNL -1 1 LSB Offset Error (Note 2) V -10 10 mV OS Gain Error GE -3 -0.2 3 mV Full-Scale Voltage V Code = FFF hex, T = +25C 4.0458 4.095 4.1442 V FS A MAX5120A 310 Full-Scale Temperature TCV ppm/C FS Coefficient (Note 3) MAX5120B 10 30 Power-Supply Rejection Ratio PSRR 4.5V V 5.5V 20 250 V/V DD REFERENCE Output Voltage V T = +25C 2.5 V REF A MAX5120A 3 Output Voltage Temperature TCV ppm/C REF Coefficient MAX5120B 10 Reference External Load Regulation V /I 0 I 100A (sourcing) 0.1 1 V/A OUT OUT OUT Reference Short-Circuit Current 4 mA REFADJ Current REFADJ = V 3.3 7 A DD DIGITAL INPUT Input High Voltage V 3 V IH Input Low Voltage V 0.8 V IL Input Hysteresis V 200 mV HYS Input Leakage Current I V = 0 or V -1 0.001 1 A IN IN DD Input Capacitance C 8 pF IN DIGITAL OUTPUTS Output High Voltage V I = 2mA V - 0.5 V OH SOURCE DD Output Low Voltage V I = 2mA 0.13 0.4 V OL SINK 2 MAX5120/MAX5121