AD7394 Analog Devices, AD7394 Datasheet
AD7394
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AD7394 Summary of contents
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... Serial Input 12-Bit DAC FUNCTIONAL BLOCK DIAGRAM CS EN CLK SDI (DATA) SHIFT REGISTER LDA LDB DGND The AD7394 is specified over the extended industrial (−40°C to +85°C) temperature range and is available in a low profile 1.75 mm height SOIC surface mount package 2.5V REF 0.6 ...
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... AD7394 TABLE OF CONTENTS Features .............................................................................................. 1 Applications ....................................................................................... 1 Functional Block Diagram .............................................................. 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Specifications ..................................................................................... 3 AD7394 Electrical Characteristics ............................................. 3 Absolute Maximum Ratings ............................................................ 7 ESD Caution .................................................................................. 7 Pin Configuration and Function Descriptions ............................. 8 Typical Performance Characteristics ............................................. 9 Theory of Operation ...................................................................... 12 REVISION HISTORY 1/10—Rev Rev. A Updated Format .................................................................. Universal Removed AD7395 ............................................................... Universal Updated Outline Dimensions ...
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... SPECIFICATIONS AD7394 ELECTRICAL CHARACTERISTICS @ V = 2.5 V, −40°C < T < +85°C, unless otherwise noted. REF IN A Table 1. Parameter STATIC PERFORMANCE 1 Resolution 2 Relative Accuracy 2 Differential Nonlinearity Zero-Scale Error Full-Scale Voltage Error 3 Full-Scale Tempco REFERENCE INPUT V Range REF IN Input Resistance 3 Input Capacitance ANALOG OUTPUT ...
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... Parameter SUPPLY CHARACTERISTICS Power Supply Range Shutdown Supply Current Positive Supply Current Power Dissipation Power Supply Sensitivity 1 One LSB = V /4096 V for the 12-bit AD7394. REF 2 The first two codes (000 , 001 ) are excluded from the linearity error measurement These parameters are guaranteed by design and not subject to production testing. ...
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... LDA, LDB LD1 SDI CLK LDA, LDB OUT ZS SHDN I D11 D10 CSS LDW Figure 3. DD Figure 4. Rev Page CSH t LD2 t CLRW ±1 LSB ERROR BAND t SDR AD7394 ...
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... X ↑+ positive logic transition; ￬− negative logic transition; X don’t care not clock in serial data while level sensitive inputs LDA or LDB are logic low. 2 Table 3. AD7394 Serial Input Register Data Format, Data Is Loaded in MSB-First Format MSB B11 B10 B9 D11 ...
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... maximum rating conditions for extended periods may affect –0 0.3 V device reliability max – T )/θ ESD CAUTION 158°C/W 150°C −40°C to +85°C −65°C to +150°C 215°C Rev Page AD7394 ...
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... DAC register controls the DAC output Positive Power Supply Input. Specified range of operation DAC B Voltage Output. OUTB AGND OUTB OUTA DD AD7394 V 3 SHDN 12 REF DGND MSB 4 11 TOP VIEW (Not to Scale) CS LDB 5 10 CLK ...
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... V (V) REF Figure 9. Full-Scale Error vs. V REF REF 100 1k 10k FREQUENCY (Hz) Figure 10. Output Noise Density vs. Frequency 0.5 1.0 1.5 2.0 V (V) IN Figure 11. Supply Current vs. Logic Input Voltage AD7394 T = 25°C A 4.5 5 2.5V = +25°C 100k 2.5 3.0 ...
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... AD7394 5.0 4.5 4.0 3.5 V FROM LOW TO HIGH LOGIC 3.0 2.5 2.0 V FROM HIGH TO LOW 1.5 LOGIC 1 (V) DD Figure 12. Logic Threshold vs. Supply Voltage 1800 2.7V, CODE = 555 DD H 1600 2.7V, CODE = 3FF 5.5V, CODE = 155 DD H 1400 5.5V, CODE = 3FF DD H 1200 1000 800 600 400 ...
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... TIME (2µs/DIV) Figure 17. Midscale Transition Performance 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 –2 – OUT TO 7FF H H Rev Page CODE = FFF H CODE = 000 H 100 200 300 400 500 HOURS OF OPERATION (150°C) Figure 18. Long-Term Drift Accelerated by Burn-In AD7394 600 ...
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... D = REF V OUT N 2 where the decimal data word loaded into the DAC register the number of bits of DAC resolution. For the 12-bit AD7394 operating from a 5.0 V reference Equation 1 becomes: × OUT 4096 Using Equation 3 the AD7394 provides a nominal midscale voltage of 2.50 V for D = 2048, and a full-scale output of 4.998 V. The LSB step size is = 5.0 × ...
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... V CMOS logic input-voltage level while operating the AD7394 power supply. If this mode of interface is used, make sure that the V of the 5 V CMOS meets the V AD7394 operating See Figure 12 for a graph of digital logic input threshold vs. operating V 0.1µF 10µF ...
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... X D11 D11 to D0: 12-bit AD7394 DAC data don’t care; the MSB of byte 1 is the first bit that is loaded into the SDI input CLK SDI SHIFT REGISTER RESET (RS) PIN Forcing the asynchronous RS pin low sets the DAC register to all zeros, or midscale, depending on the logic level applied to the MSB pin ...
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... SHDN pin to the V DD disabling this function. UNIPOLAR OUTPUT OPERATION This is the basic mode of operation for the AD7394. As shown in Figure 23, the AD7394 has been designed to drive loads as low as 5 kΩ in parallel with 100 pF. The code table for this operation is shown in Table 7. ...
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... AD7394ARZ-REEL7 12 −40°C to +85°C 1 The AD7394 contains 709 transistors. The die size measures 70 mil × 99 mil RoHS Compliant Part. ©1998–2010 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. ...