+2.7 V to +5.5 V, Serial Input, Dual a Voltage Output 8-Bit DAC AD7303 FUNCTIONAL BLOCK DIAGRAM FEATURES Two 8-Bit DACs in One Package 8-Pin DIP/SOIC and microSOIC Packages AD7303 +2.7 V to +5.5 V Operation INPUT DAC I DAC A I/V Internal & External Reference Capability V A OUT REGISTER REGISTER Individual DAC Power-Down Function Three-Wire Serial Interface DAC INPUT I DAC B I/V V B OUT QSPI, SPI and Microwire Compatible REGISTER REGISTER On-Chip Output Buffer Rail-to-Rail Operation POWER ON DATA (8) CONTROL (8) MUX RESET DIN On-Chip Control Register 16-BIT SHIFT REGISTER SCLK Low Power Operation: 2.3 mA 3.3 V 2 SYNC Full Power-Down to 1 mA max, typically 80 nA V GND REF DD APPLICATIONS Portable Battery Powered Instruments Digital Gain and Offset Adjustment Programmable Voltage and Current Sources Programmable Attenuators PRODUCT HIGHLIGHTS GENERAL DESCRIPTION 1. Low power, single supply operation. This part operates from The AD7303 is a dual, 8-bit voltage out DAC that operates a single +2.7 V to +5.5 V supply and consumes typically from a single +2.7 V to +5.5 V supply. Its on-chip precision out- 15 mW at 5.5 V, making it ideal for battery powered put buffers allow the DAC outputs to swing rail to rail. This de- applications. vice uses a versatile 3-wire serial interface that operates at clock rates up to 30 MHz, and is compatible with QSPI, SPI, microwire 2. The on-chip output buffer amplifiers allow the outputs of the and digital signal processor interface standards. The serial input DACs to swing rail to rail with a settling time of typically 1.2 s. register is sixteen bits wide 8 bits act as data bits for the DACs, 3. Internal or external reference capability. and the remaining eight bits make up a control register. 4. High speed serial interface with clock rates up to 30 MHz. The on-chip control register is used to address the relevant DAC, to power down the complete device or an individual 5. Individual power-down of each DAC provided. When com- DAC, to select internal or external reference and to provide a pletely powered down, the DAC consumes typically 80 nA. synchronous loading facility for simultaneous update of the DAC outputs with a software LDAC function. The low power consumption of this part makes it ideally suited to portable battery operated equipment. The power consump- tion is 7.5 mW max at 3 V, reducing to less than 3 W in full power-down mode. The AD7303 is available in an 8-pin plastic dual in-line pack- age, 8-lead SOIC and microSOIC packages. QSPI and SPI are trademarks of Motorola. Microwire is a trademark of National Semiconductor. REV. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or Tel: 617/329-4700 World Wide Web Site: (V = +2.7 V to +5.5 V, Internal Reference R = 10 kV to V and GND C = 100 pF DD L DD L AD7303SPECIFICATIONS to GND all specifications T to T unless otherwise noted) MIN MAX 1 Parameter B Versions Units Conditions/Comments STATIC PERFORMANCE Resolution 8 Bits Relative Accuracy 1 LSB max Note 2 Differential Nonlinearity 1 LSB max Guaranteed Monotonic Zero-Code Error +25C 3 LSB max All Zeros Loaded to DAC Register Full-Scale Error 0.5 LSB typ All Ones Loaded to DAC Register 3 Gain Error +1 % FSR typ Zero-Code Temperature Coefficient 100 V/C typ DAC REFERENCE INPUT REFIN Input Range 1 to V /2 V min to max DD REFIN Input Impedance 10 typ 4 Internal Voltage Reference Error 1 % max OUTPUT CHARACTERISTICS Output Voltage Range 0 to V V min to max DD Output Voltage Settling Time 2 s max Typically 1.2 s Slew Rate 7.5 V/s typ Digital to Analog Glitch Impulse 0.5 nV-s typ 1 LSB Change Around Major Carry Digital Feedthrough 0.2 nV-s typ Digital Crosstalk 0.2 nV-s typ Analog Crosstalk 0.2 LSB typ DC Output Impedance 40 typ Short Circuit Current 14 mA typ Power Supply Rejection Ratio 0.0001 %/% max V = 10% DD LOGIC INPUTS Input Current 10 A max V , Input Low Voltage 0.8 V max V = +5 V INL DD 0.6 V max V = +3 V DD V , Input High Voltage 2.4 V min V = +5 V INH DD 2.1 V min V = +3 V DD Pin Capacitance 5 pF max POWER REQUIREMENTS V 2.7/5.5 V min/max DD I (Normal Mode) Both DACs Active and Excluding Load Currents, DD V = 3.3 V V = V , V = GND DD IH DD IL +25C 2.1 mA max See Figure 8 T T 2.3 mA max MIN MAX V = 5.5 V DD +25C 2.7 mA max T T 3.5 mA max MIN MAX I (Full Power-Down) DD +25C 80 nA typ V = V , V = GND IH DD IL T T 1 A max See Figure 19 MIN MAX NOTES 1 Temperature ranges are as follows: B Version, 40C to +105C. 2 Relative Accuracy is calculated using a reduced digital code range of 15 to 245. 3 Gain Error is specified between Codes 15 and 245. The actual error at Code 15 is typically 3 LSB. 4 Internal Voltage Reference Error = (Actual V Ideal V /Ideal V ) 100. Ideal V = V /2, actual V = voltage on reference pin when internal reference REF REF REF REF DD REF is selected. Specifications subject to change without notice. ORDERING GUIDE Temperature Package Model Range Options* AD7303BN 40C to +105C N-8 AD7303BR 40C to +105C SO-8 AD7303BRM 40C to +105C RM-8 *N = Plastic DIP R = SOIC RM = microSOIC. 2 REV. 0