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DAC8408FPZ Datasheet(PDF) 10 Page - Analog Devices |
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DAC8408FPZ Datasheet(HTML) 10 Page - Analog Devices |
10 / 16 page DAC8408 –10– REV. A BASIC APPLICATIONS Some basic circuit configurations are shown in Figures 6 and 7. Figure 6 shows the DAC8408 connected in a unipolar configu- ration (2-Quadrant Multiplication), and Table I shows the Code Table. Resistors R1, R2, R3, and R4 are used to trim full scale output. Full-scale output voltage = VREF –1 LSB = VREF (1–2 –8) or VREF × (255/256) with all digital inputs high. Low tempera- ture coefficient (approximately 50 ppm/ °C) resistors or trim- mers should be selected if used. Full scale can also be adjusted using VREF voltage. This will eliminate resistors R1, R2, R3, and R4. In many applications, R1 through R4 are not required, and the maximum gain error will then be that of the DAC. Each DAC exhibits a variable output resistance that is code- dependent. This produces a code-dependent, differential non- linearity term at the amplifier’s output which can have a maxi- mum value of 0.67 × the amplifier’s offset voltage. This differ- ential nonlinearity term adds to the R-2R resistor ladder differ- ential-nonlinearity; the output may no longer be monotonic. To maintain monotonicity and minimize gain and linearity errors, it is recommended that the op amp offset voltage be adjusted to less than 10% of 1 LSB (1 LSB = 2 –8 × V REF or 1/256 × V REF), or less than 3.9 mV over the operating temperature range. Zero- scale output voltage (with all digital inputs low) may be adjusted using the op amp offset adjustment. Capacitors C1, C2, C3, and C4 provide phase compensation and help prevent overshoot and ringing when using high speed op amps. Figure 7 shows the recommended circuit configuration for the bipolar operation (4-quadrant multiplication), and Table II shows the Code Table. Trimmer resistors R17, R18, R19, and R20 are used only if gain error adjustments are required and range between 50 Ω and 1000 Ω. Resistors R21, R22, R23, and R24 will range betwen 50 Ω and 500 Ω. If these resistors are used, it is essential that resistor pairs R9–R13, R10–R14, R11–R15, R12–R16 are matched both in value and tempco. They should be within 0.01%; wire wound or metal foil types are preferred for best temperature coefficient matching. The circuits of Figure 6 and 7 can either be used as a fixed reference D/A converter, or as an attenuator with an ac input voltage. Table I. Unipolar Binary Code Table (Refer to Figure 6) DAC Data Input MSB LSB Analog Output 1 1 1 1 1 1 1 1 –VREF 255 256 1 0 0 0 0 0 0 1 –VREF 129 256 1 0 0 0 0 0 0 0 –VREF 128 256 = –VIN 2 0 1 1 1 1 1 1 1 –VREF 127 256 0 0 0 0 0 0 0 1 –VREF 1 256 0 0 0 0 0 0 0 0 –VREF 0 256 = 0 NOTE 1 LSB = (2 –8) (V REF) = 1 256 (VREF) Figure 6. Quad DAC Unipolar Operation (2-Quadrant Multiplication) |
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