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AD5399YRM データシート(PDF) 1 Page - Analog Devices |
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AD5399YRM データシート(HTML) 1 Page - Analog Devices |
1 / 12 page Twos Complement, Dual 12-Bit DAC with Internal REF and Fast Settling Time AD5399 Rev. D 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 that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.326.8703 © 2004 Analog Devices, Inc. All rights reserved. FEATURES 2-channel 12-bit DAC Twos complement facilitates bipolar applications Bipolar zero with 2 V dc offset Built-in 2.000 V precision reference with 10 ppm/°C typ TC Buffered voltage output: 0 V to 4 V Single-supply operation: 4.5 V to 5.5 V Fast 0.8 µs settling time typ Ultracompact MSOP-10 package Monotonic DNL < ±1 LSB Optimized accuracy at zero scale Power-on reset to VREF 3-wire serial data input Extended temperature range: –40°C to +105°C APPLICATIONS Single-supply bipolar converter operations General-purpose DSP applications Digital gain and offset controls Instrumentation level settings Disk drive control Precision motor control GENERAL DESCRIPTION The AD5399 is the industry-first dual 12-bit digital-to-analog converter that accepts twos complement digital coding with 2 V dc offset for single-supply operation. Augmented with a built-in precision reference and a solid buffer amplifier, the AD5399 is the smallest self-contained 12-bit precision DAC that fits many general-purpose as well as DSP specific applications. The twos complement programming facilitates the natural coding implementation commonly found in DSP applications, and allows operation in single supply. The AD5399 provides a 2 V reference output, VREF, for bipolar zero monitoring. It can also be used for other on-board components that require a precision reference. The device is specified for operation from 5 V ± 10% single supply with bipolar output swing from 0 V to 4 V centered at 2 V. The AD5399 is available in the compact 1.1 mm low profile MSOP-10 package. All parts are guaranteed to operate over the extended industrial temperature range of –40°C to +105°C. FUNCTIONAL BLOCK DIAGRAM X2 ×2 VREF 2V ×2 DECODER SW DRIVER A DECODER SW DRIVER B ADDR DECODE DAC A REGISTER DAC B REGISTER 16-BIT D15...D0 POWER-ON RESET EN A0 12 12 12 CLK CS SDI DGND AGND VTP VDD VBZ + 2V = 4V VBZ – 2V = 0V VOUTA VOUTB VBZ(VREF) = 2V AD5399 Figure 1. VOUT = ((D – 2048)/4096 × 4 V) + 2 V for 0 ≤ D ≤ 4095, where D is the decimal code. Table 1. Examples of Twos Complement Codes Twos Complement D Scale VOUT (V) 2047 4095 +FS 4.000 2046 4094 +FS – 1 LSB 3.999 1 2049 BZS + 1 LSB 2.001 0 2048 BZS 2.000 4095 2047 BZS – 1 LSB 1.999 2049 1 –FS + 1 LSB 0.001 2048 0 –FS 0.000 FS = Full Scale, BZS = Bipolar Zero Scale. VOUT = [(0 – 2048)/4096 × 4V] + 2V 0 1.0 0.5 3.0 3.5 2.0 1.5 2.5 4.0 0 512 1024 1536 2048 2560 3072 3584 4096 TWOS COMPLEMENT CODE Figure 2. Output vs. Twos Complement Code |
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