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DAC725 Datasheet(PDF) 4 Page - Burr-Brown (TI) |
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DAC725 Datasheet(HTML) 4 Page - Burr-Brown (TI) |
4 / 7 page 4 ® DAC725 DISCUSSION OF SPECIFICATIONS DIGITAL INPUT CODES The DAC725 accepts positive-true binary twos complement input code, as shown in Table I. The data is loaded into either DAC, 8 bits at a time. The data may also be clocked into the device in a serial format. ANALOG OUTPUT (Binary Two's Complement, DIGITAL INPUT CODES Bipolar Operation, All Models) 7FFFH + Full Scale 0000H Zero FFFFH – 1LSB 8000H – Full Scale TABLE I. Digital Input Codes. ACCURACY Linearity This specification describes one of the most important mea- sures of performance of a D/A converter. Linearity error is the deviation of the analog output from a straight line drawn through the end points (minus full-scale point and plus full- scale point). Differential Linearity Error Differential Linearity Error (DLE) of a D/A converter is the deviation from an ideal 1LSB change in the output when the input changes from one adjacent code to the next. A differ- ential linearity error specification of ±1/2LSB means that the output step size can be between 1/2LSB and 3/2LSB when the input changes between adjacent codes. A negative DLE specification of –1LSB maximum (–0.006% for 14-bit reso- lution) insures monotonicity. Monotonicity Monotonicity assures that the analog output will increase or remain the same for increasing input digital codes. The DAC725 is specified to be monotonic to 14 bits over the entire specification range. DRIFT Gain Drift Gain drift is a measure of the change in full-scale range output over temperature expressed in parts per million per degree centigrade (ppm/ °C). Gain drift is established by: (1) testing the end point differences at tMIN, +25°C and tMAX, (2) calculating the gain error with respect to the +25 °C value, and (3) dividing by the temperature change. The DAC725 is specified for Maximum Gain and Offset values at temperature. This tells the system designer the maximum that can be expected over temperature, regardless of room temperature values. Zero Drift Zero drift is a measure of change in the output with 0000 H applied to the D/A converter inputs over the specified temperature range. This code corresponds to 0V analog output. The maximum change in offset at tMIN or tMAX is referenced to the zero error at +25 °C and is divided by the temperature change. This drift is expressed in FSR/ °C. SETTLING TIME Settling time of the D/A is the total time required for the analog output to settle within an error band around its final value after a change in digital input. Refer to Figure 1 for typical values for this family of products. FIGURE 1. Final-Value Error Band Versus Full-Scale Range Settling Time. Settling times are specified to ±0.003% of FSR (±1/2LSB for 14 bits) for two input conditions: a full-scale range change of 20V ( ±10V), and a 1LSB change at the “major carry,” the point at which the worst-case settling time occurs. This is the worst-case point since all of the input bits change when going from one code to the next. POWER SUPPLY SENSITIVITY Power supply sensitivity is a measure of the effect of a change in a power supply voltage on the D/A converter output. It is defined as a percent of FSR change in the output per percent of change in either the positive supply (+VCC), negative supply (–V CC) or logic supply (VDD) about the nominal power supply voltages (see Figure 2). It is specified for DC or low frequency changes. The typical performance curve in Figure 2 shows the effect of high frequency changes in power supply voltages. 0.1 Settling Time (µs) 1 0.1 0.01 0.001 1 10 100 |
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