AD7303 Analog Devices, AD7303 Datasheet
AD7303
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AD7303 Summary of contents
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... Programmable Voltage and Current Sources Programmable Attenuators GENERAL DESCRIPTION The AD7303 is a dual, 8-bit voltage out DAC that operates from a single +2 +5.5 V supply. Its on-chip precision out- put buffers allow the DAC outputs to swing rail to rail. This de- vice uses a versatile 3-wire serial interface that operates at clock rates MHz, and is compatible with QSPI, SPI, microwire and digital signal processor interface standards ...
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... 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 REF is selected. Specifications subject to change without notice. Model AD7303BN AD7303BR AD7303BRM *N = Plastic DIP SOIC microSOIC +2 +5.5 V, Internal Reference GND; all specifications T MIN 1 B Versions ...
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... DB0 DB8 Figure 2. Timing Diagram for 2 8-Bit Writes –3– AD7303 /2 Reference; all specifications DD Conditions/Comments SCLK Cycle Time SCLK High Time SCLK Low Time SYNC Setup Time Data Setup Time Data Hold Time SYNC Hold Time Minimum SYNC High Time ...
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... ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the AD7303 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality ...
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... Power supply rejection ratio is quoted in terms of % change in output per % of change in V for full-scale output of the DAC 10%. This specification applies to an external reference only because the output voltage will track the V ternal reference is selected. –5– AD7303 is varied DD voltage when in- DD ...
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... AD7303–Typical Performance Characteristics 800 V = +5V AND +3V 720 DD INTERNAL REFERENCE 640 DAC LOADED WITH 00HEX 560 480 400 320 249 160 SINK CURRENT – mA Figure 3. Output Sink Current Capa- bility with and 0 +5V ...
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... TEMPERATURE – C Figure 16. Typical INL vs. Temperature 500 400 300 200 100 0 – 100 120 140 Figure 19. Power-Down Current vs. Temperature –7– AD7303 SYNC V = +5V DD INTERNAL VOLTAGE 1 REFERENCE 10 LSB STEP CHANGE OUT 2 CH1 5.00V, CH2 50.0mV, M 250ns 4 4 ...
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... N is the decimal equivalent of the code loaded to the DAC register and ranges from 0 to 255. Reference The AD7303 has the facility to use either an external reference applied through the REF pin or an internal reference generated from V . Figure 21 shows the reference input arrangement ...
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... The input shift register is 16 bits wide. The first eight bits con- sist of control bits and the last eight bits are data bits. Figure 23 shows a block diagram of the logic interface on the AD7303 DAC. The seven bits in the control word are taken from the in- ...
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... AD7303 DB15 (MSB) X LDAC PDB PBA INT/EXT |––––––––––––––––––––––––– Control Bits –––––––––––––––––––––––––|––––––––––––––––––––––––– Data Bits –––––––––––––––––––––––––| ...
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... POWER-DOWN FEATURES Two bits in the control section of the 16-bit input word are used to put the AD7303 into low power mode. DAC A and DAC B can be powered down separately. When both DACs are powered down, the current consumption of the device is reduced to less than 1 A, making the device suitable for use in portable battery powered equipment ...
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... SO *ADDITIONAL PINS OMITTED FOR CLARITY Figure 29. AD7303 to Microwire Interface APPLICATIONS Typical Application Circuit Figure 30 shows a typical setup for the AD7303 when using an external reference. The reference range for the AD7303 is from Higher values of reference can be incorporated DD but will saturate the output at both the top and bottom end of the transfer function ...
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... DIN Figure 32. AD7303 in Opto-Isolated Interface Decoding Multiple AD7303 The SYNC pin on the AD7303 can be used in applications to decode a number of DACs. In this application, all DACs in the system receive the same serial clock and serial data, but only the SYNC to one of the DACs will be active at any one time allow- ing access to two channels in this eight-channel system ...
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... Inductance (ESI), like the common ceramic types that provide a low impedance path to ground at high frequencies to handle transient currents due to internal logic switching. The power supply lines of the AD7303 should use as large a trace as possible to provide low impedance paths and reduce the effects of glitches on the power supply line. Fast switching sig- ...
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... REV SCLK and DIN enabled as outputs SPI on, Master mode, CPOL=0, CPHA=0, Clock rate =E/32 Update AD7303 output. Restart. Save relevant registers. Control Word " 0" Load both DAC A and DAC B DAC registers from shift register with internal reference selected. Data Word " ...
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... AD7303 OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 8-Pin Plastic DIP (N-8) 0.430 (10.92) 0.348 (8.84 0.280 (7.11) 0.240 (6.10 0.325 (8.25) 0.300 (7.62) 0.060 (1.52) PIN 1 0.015 (0.38) 0.210 (5.33) MAX 0.130 (3.30) 0.160 (4.06) MIN 0.115 (2.93) SEATING 0.022 (0.558) 0.100 0.070 (1.77) PLANE (2.54) 0.014 (0.356) 0.045 (1.15) BSC 8-Lead SOIC (SO-8) 0.1968 (5.00) 0.1890 (4.80) ...