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DAC709KH-2 Scheda tecnica(PDF) 6 Page - Texas Instruments |
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DAC709KH-2 Scheda tecnica(HTML) 6 Page - Texas Instruments |
6 / 13 page ® DAC707/708/709 6 DISCUSSION OF SPECIFICATIONS DIGITAL INPUT CODES For bipolar operation, the DAC707/708/709 accept positive- true binary two’s complement input code. For unipolar operation (DAC708/709 only) the input code is positive-true straight-binary provided that the MSB input is inverted with an external inverter. See Table I. the MSB must be inverted). This code corresponds to zero volts (DAC707 and DAC709) or zero milliamps (DAC708) at the analog output. The maximum change in offset at t MIN or t MAX 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. Voltage Output 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) or 10V (±5V or 0 to 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.) Current Output Settling times are specified to ±0.003% of FSR for a full- scale range change for two output load conditions: one for 10 Ω to 100Ω and one for 1000Ω. It is specified this way because the output RC time constant becomes the dominant factor in determining settling time for large resistive loads. COMPLIANCE VOLTAGE Compliance voltage applies only to current output models. It is the maximum voltage swing allowed on the output current pin while still being able to maintain specified accuracy. 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 ANALOG OUTPUT Digital Unipolar Straight Binary(1) Binary Two's Complement Input (DAC708/709 only; connected (Bipolar operation; Codes for Unipolar operation) all models) 7FFFH +1/2 Full Scale –1LSB(2) +Full Scale 0000H Zero Zero FFFFH +Full Scale –1LSB 8000H +1/2 Full Scale –Full Scale NOTES: (1) MSB must be inverted externally. (2) Assumes MSB is inverted externally. 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 (–Full Scale point and +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 DAC707/708/709 are specified to be monotonic to 14 bits over the entire specification temperature range. DRIFT Gain Drift Gain Drift is a measure of the change in the 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 t MIN, +25°C and tMAX; (2) calculating the gain error with respect to the +25 °C value; and (3) dividing by the temperature change. Zero Drift Zero Drift is a measure of the change in the output with 0000 H applied to the D/A converter inputs over the specified temperature range. (For the DAC708/709 in unipolar mode, 1 0.1 0.01 0.01 0.1 1 10 Settling Time (µs) 0.001 DAC707 DAC709 R = 100 Ω R = 1k Ω L L DAC708 |
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