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AD7244 Dataheets PDF



Part Number AD7244
Manufacturers Analog Devices
Logo Analog Devices
Description LC2MOS Dual/ Complete/ 12-Bit/14-Bit Serial DACs
Datasheet AD7244 DatasheetAD7244 Datasheet (PDF)

a FEATURES 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 LC2MOS Dual, Complete, 12-Bit/14-Bit Serial DACs AD7242/AD7244 FUNCTIONAL BLOCK DIAGRAM GENERAL DESCRIPTION The AD7242/AD7244 is a fast, complete, dual 12-bit/14-.

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a FEATURES 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 LC2MOS Dual, Complete, 12-Bit/14-Bit Serial DACs AD7242/AD7244 FUNCTIONAL BLOCK DIAGRAM 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 possible with a separate LDAC input for each DAC. The AD7242/AD7244 operates from ± 5 V power supplies, providing an analog output range of ± 3 V. A REF OUT/REF IN function allows the DACs to be driven from the on-chip 3 V reference or from an external reference source. The AD7242/AD7244 is fabricated in Linear Compatible CMOS (LC2MOS), an advanced mixed technology process that combines precision bipolar circuits with low power CMOS logic. Both parts are available in a 24-pin, 0.3-inch wide, plastic or hermetic dual-in-line package (DIP) and in a 28-pin, plastic small outline (SOIC) package. The AD7242 and AD7244 are available in the same pinout to allow easy upgrade from 12-bit to 14-bit performance. PRODUCT HIGHLIGHTS 1. Complete, Dual 12-Bit/14-Bit DACs The AD7242/AD7244 provides the complete function for generating voltages to 12-bit/14-bit resolution. The part features an on-chip reference, output buffer amplifiers and two 12-bit/14-bit D/A converters. 2. High Speed Serial Interface The AD7242/AD7244 provides a high speed, easy-to-use, serial interface allowing direct interfacing to DSP processors and microcontrollers. A separate serial port is provided for each DAC. 3. Small Package Size The AD7242/AD7244 is available in a 24-pin DIP and a 28pin SOIC package offering considerable space saving over comparable solutions. REV. A Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its 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 otherwise under any patent or patent rights of Analog Devices. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 617/329-4700 World Wide Web Site: http://www.analog.com Fax: 617/326-8703 © Analog Devices, Inc., 1996 = +5 V ؎ 5% V = –5 V ؎ 5%, AGND = DGND = 0 V, REF INA = AD7242/AD7244–SPECIFICATIONS (V REF INB = +3 V. V , V load to AGND: R = 2 k⍀, C = 100 pF. DD SS OUTA OUTB L L All Specifications TMIN to TMAX unless otherwise noted.) Parameter DC ACCURACY Resolution Integral Nonlinearity Differential Nonlinearity Bipolar Zero Error Positive Full-Scale Error2 Negative Full-Scale Error2 REFERENCE OUTPUT3 REF OUT @ +25°C TMIN to TMAX REF OUT Tempco Reference Load Change (∆REF OUT vs. ∆I) REFERENCE INPUTS REF INA, REF INB Input Range Input Current LOGIC INPUTS (LDACA, LDACB, TFSA, TFSB, TCLKA, TCLKB, DTA, DTB) Input High Voltage, VINH Input Low Voltage, VINL Input Current, IIN Input Capacitance, CIN4 ANALOG OUTPUTS (VOUTA, VOUTB) Output Voltage Range DC Output Impedance Short Circuit Current AC CHARACTERISTICS4 Voltage Output Settling Time Positive Full-Scale Change Negative Full-Scale Change Digital-to-Analog Glitch Impulse Digital Feedthrough Channel-to-Channel Isolation POWER REQUIREMENTS VDD VSS IDD ISS Total Power Dissipation AD7242 J, A Versions1 K, B Versions1 12 ±1 ±1 ±5 ±5 ±5 2.99/3.01 2.98/3.02 35 –1 2.85/3.15 1 12 ± 1/2 ±1 ±5 ±5 ±5 2.99/3.01 2.98/3.02 35 –1 2.85/3.15 1 Units Bits LSB max LSB max LSB max LSB max LSB max V min/V max V min/V max ppm/°C typ mV max V min/V max µA max Reference Load Current Change (0 µA–500 µA) 3 V ± 5% Test Conditions/Comments Guaranteed Monotonic 2.4 0.8 ± 10 10 2.4 0.8 ± 10 10 V min V max µA max pF max VDD = 5 V ± 5% VDD = 5 V ± 5% VIN = 0 V to VDD ±3 0.1 20 ±3 0.1 20 V nom Ω typ mA typ Settling Time to Within ± 1/2 LSB of Final Value Typically 2 µs Typically 2 µs DAC Code Change All 1s to All 0s VOUT = 10 kHz Sine Wave ± 5% for Specified Performance ± 5% for Specified Performance Cumulative Current from the Two VDD Pins Cumulative Current from the Two VSS Pins Typically 130 mW 3 3 10 2 110 +5 –5 27 15 195 3 3 10 2 110 +5 –5 27 15 195 µs max µs max nV secs typ nV secs typ dB typ V nom V nom mA max mA max mW max NOTES 1 Temperature ranges are as follows: J, K Versions: –40°C to +85 °C; A, B Versions: –40°C to +85 °C. 2 Measured with respect to REF IN and includes bipolar offset error. 3 For capacitive loads greater than 50 pF, a series res.


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