AD7244JNZ Analog Devices

2 LC MOS Dual, Complete, a 12-Bit/14-Bit Serial DACs AD7244 FEATURES FUNCTIONAL BLOCK DIAGRAM Two 12-Bit/14-Bit DACs with Output Amplifiers AD7242: 12-Bit Resolution AD7244: 14-Bit Resolution On-Chip Voltage Reference Fast Settling Time AD7242: 3 s to 1/2 LSB AD7244: 4 s to 1/2 LSB High Speed Serial Interface Operates from 5 V Supplies Specified Over 40 C to +85 C in Plastic Packages Low Power 130 mW typ AD7242 is obsolete GENERAL DESCRIPTION The AD7242/AD7244 is a fast, complete, dual 12-bit/14-bit voltage output D/A converter. It consists of a 12-bit/14-bit DAC, 3 V buried Zener reference, DAC output amplifiers and high speed serial interface logic. Interfacing to both DACs is serial, minimizing pin count and allowing a small package size. Standard control signals allow interfacing to most DSP processors and microcontrollers. Asynchronous control of DAC updating for both DACs is made PRODUCT HIGHLIGHTS possible with a separate LDAC input for each DAC. 1. Complete, Dual 12-Bit/14-Bit DACs The AD7242/AD7244 operates from 5 V power supplies, The AD7242/AD7244 provides the complete function for providing an analog output range of 3 V. A REF OUT/REF generating voltages to 12-bit/14-bit resolution. The part IN function allows the DACs to be driven from the on-chip 3 V features an on-chip reference, output buffer amplifiers and reference or from an external reference source. two 12-bit/14-bit D/A converters. The AD7242/AD7244 is fabricated in Linear Compatible 2. High Speed Serial Interface 2 CMOS (LC MOS), an advanced mixed technology process that The AD7242/AD7244 provides a high speed, easy-to-use, combines precision bipolar circuits with low power CMOS serial interface allowing direct interfacing to DSP processors logic. Both parts are available in a 24-pin, 0.3-inch wide, plastic and microcontrollers. A separate serial port is provided for or hermetic dual-in-line package (DIP) and in a 28-pin, plastic each DAC. small outline (SOIC) package. The AD7242 and AD7244 are 3. Small Package Size available in the same pinout to allow easy upgrade from 12-bit The AD7242/AD7244 is available in a 24-pin DIP and a 28- to 14-bit performance. pin SOIC package offering considerable space saving over comparable solutions. The AD7242 is no longer available. B REV. 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 781/329-4700 which may result from its use. No license is granted by implication or Tel: World Wide Web Site: (V = +5 V 5% V = 5 V 5%, AGND = DGND = 0 V, REF INA = DD SS AD7242/AD7244SPECIFICATIONS REF INB = +3 V. V , V load to AGND: R = 2 k , C = 100 pF. OUTA OUTB L L All Specifications T to T unless otherwise noted.) MIN MAX AD7242 1 1 Parameter J, A Versions K, B Versions Units Test Conditions/Comments DC ACCURACY Resolution 12 12 Bits Integral Nonlinearity 1 1/2 LSB max Differential Nonlinearity 1 1 LSB max Guaranteed Monotonic Bipolar Zero Error 5 5 LSB max 2 Positive Full-Scale Error 5 5 LSB max 2 Negative Full-Scale Error 5 5 LSB max 3 REFERENCE OUTPUT REF OUT +25C 2.99/3.01 2.99/3.01 V min/V max T to T 2.98/3.02 2.98/3.02 V min/V max MIN MAX REF OUT Tempco 35 35 ppm/C typ Reference Load Change (REF OUT vs. I) 1 1 mV max Reference Load Current Change (0 A500 A) REFERENCE INPUTS REF INA, REF INB Input Range 2.85/3.15 2.85/3.15 V min/V max 3 V 5% Input Current 1 1 A max LOGIC INPUTS (LDACA, LDACB, TFSA, TFSB, TCLKA, TCLKB, DTA, DTB) Input High Voltage, V 2.4 2.4 V min V = 5 V 5% INH DD Input Low Voltage, V 0.8 0.8 V max V = 5 V 5% INL DD Input Current, I 10 10 A max V = 0 V to V IN IN DD 4 Input Capacitance, C 10 10 pF max IN ANALOG OUTPUTS (V , V ) OUTA OUTB Output Voltage Range 3 3 V nom DC Output Impedance 0.1 0.1 typ Short Circuit Current 20 20 mA typ 4 AC CHARACTERISTICS Voltage Output Settling Time Settling Time to Within 1/2 LSB of Final Value Positive Full-Scale Change 3 3 s max Typically 2 s Negative Full-Scale Change 3 3 s max Typically 2 s Digital-to-Analog Glitch Impulse 10 10 nV secs typ DAC Code Change All 1s to All 0s Digital Feedthrough 2 2 nV secs typ Channel-to-Channel Isolation 110 110 dB typ V = 10 kHz Sine Wave OUT POWER REQUIREMENTS V +5 +5 V nom 5% for Specified Performance DD V 5 5 V nom 5% for Specified Performance SS I 27 27 mA max Cumulative Current from the Two V Pins DD DD I 15 15 mA max Cumulative Current from the Two V Pins SS SS Total Power Dissipation 195 195 mW max Typically 130 mW NOTES 1 Temperature ranges are as follows: J, K Versions: 40C to +85C A, B Versions: 40C to +85C. 2 Measured with respect to REF IN and includes bipolar offset error. 3 For capacitive loads greater than 50 pF, a series resistor is required (see Internal Reference section). 4 Sample tested +25C to ensure compliance. Specifications subject to change without notice. B 2 REV.