MAX5548 19-3836 Rev 1 12/05 Dual, 8-Bit, Programmable, 30mA High-Output-Current DAC General Description Features 2 The MAX5548 dual, 8-bit, digital-to-analog converter Pin-Selectable I C- or SPI-Compatible Interface (DAC) features high-output-current capability. The Guaranteed Low Output Leakage Current in MAX5548 sources up to 30mA per DAC, making it ideal Shutdown (1A max) for PIN diode biasing applications. Outputs can also be Guaranteed Monotonic over Extended paralleled for high-current applications (up to 60mA Temperature Range typ). Operating from a single +2.7V to +5.25V supply, the MAX5548 typically consumes 1.5mA per DAC in Dual Outputs for Balanced Systems normal operation and less than 1A (max) in shutdown Current Outputs Source Up to 30mA per DAC mode. The MAX5548 also features low output leakage Parallelable Outputs for 60mA Applications current in shutdown mode (1A max) that is essential to ensure that the external PIN diodes are off. Output Stable with RF Filters Additional features include an integrated +1.25V Internal or External Reference Capability bandgap reference, and a control amplifier to ensure Digital Output (DOUT) Available for Daisy high accuracy and low-noise performance. A separate Chaining in SPI Mode reference input (REFIN) allows for the use of an external +2.7V to +5.25V Single-Supply Operation reference source, such as the MAX6126, for improved 2 gain accuracy. A pin-selectable I C-/SPI-compatible 16-Pin (3mm x 3mm) Thin QFN Package serial interface provides optimum flexibility for the Programmable Output Current Range Set by MAX5548. The maximum programmable output current Software and Adjustment Resistor value is set using software and an adjustment resistor. Ordering Information The MAX5548 is available in a 3mm x 3mm, 16-pin, thin QFN package, and is specified over the extended PIN- PKG TOP (-40C to +85C) temperature range. PART PACKAGE CODE MARK Applications MAX5548ETE 16 Thin QFN-EP* T1633F-3 ACY PIN Diode Biasing *EP = Exposed paddle. Note: Device is specified over the -40C to +85C operating RF Attenuator Control range. VCO Tuning Functional Diagram V REFIN DD +1.25V BUFFER REF P 8-BIT CURRENT-STEERING OUTA DAC A FSADJA V DD P 8-BIT CURRENT-STEERING OUTB DAC B DAC REGISTER A DAC REGISTER B FSADJB SPI is a trademark of Motorola, Inc. SPI/I2C 16-BIT INPUT REGISTER MAX5548 SCLK/SCL DIN/SDA DOUT/A1 GND CS/A0 Pin Configuration appears at end of data sheet. 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.Dual, 8-Bit, Programmable, 30mA High-Output-Current DAC ABSOLUTE MAXIMUM RATINGS V to GND .............................................................-0.3V to +6V Operating Temperature Range ...........................-40C to +85C DD OUTA, OUTB to GND.................................-0.3V to (V + 0.3V) Junction Temperature .....................................................+150C DD REFIN CS/AO, DOUT/AI, SPI/I2C, FSADJA, Storage Temperature Range ............................-65C to +150C FSADJB to GND ......................................-0.3V to (V + 0.3V) Lead Temperature (soldering, 10s) ................................+300C DD SCLK/SCL, DIN/SDA ................................................-0.3V to +6V Continuous Power Dissipation (T = +85C) A 16-Pin Thin QFN (derate 17.5mW/C above +70C) ..1398.6mW 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 = +2.7V to +5.25V, GND = 0, V = +1.25V, internal reference, R = 20k compliance voltage = (V - 0.6V), DD REFIN FSADJ DD V = 0, T = -40C to +85C, unless otherwise noted. Typical values are at V = +3.0V and T = +25C.) (Note 1) SCLK/SCL A DD A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS STATIC PERFORMANCEANALOG SECTION Resolution 8 Bits Integral Nonlinearity INL I = 1mA to 30mA (Note 2) 1 LSB OUT Differential Nonlinearity DNL Guaranteed monotonic 1 LSB Offset I -13 -4 LSB OS Zero-Scale Error I = 1mA to 30mA, code = 0x00 1 A OUT I = 1mA to 30mA, code = 0xFF, OUT Full-Scale Error -4 LSB includes offset REFERENCE Internal Reference Range 1.21 1.25 1.29 V Internal Reference Tempco 30 ppm/C External Reference Range 0.5 1.5 V External Reference Input Current 108 225 A DAC OUTPUTS Full-Scale Current (Note 3) 1 30 mA Output Current Leakage in 1 A Shutdown Output Capacitance 10 pF I = 30mA 1 OUT Current Source Dropout Voltage T = +25C 0.55 V A (V - V ) DD OUT I = 20mA OUT T = -40C to +85C 0.6 A Output Impedance at Full-Scale 100 k Current Capacitive Load to Ground C 10 nF LOAD Series Inductive Load L 100 nH LOAD Maximum FSADJ Capacitive C 75 pF FSADJ Load DYNAMIC PERFORMANCE Settling Time t C = 24pF, L = 27nH (Note 4) 30 s S LOAD LOAD Digital Feedthrough 2 nVs Digital-to-Analog Glitch Impulse 40 nVs 2 MAX5548