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DAC701CH 데이터시트(PDF) 6 Page - Texas Instruments |
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DAC701CH 데이터시트(HTML) 6 Page - Texas Instruments |
6 / 11 page 6 ® DAC701, 702, 703 DISCUSSION OF SPECIFICATIONS DIGITAL INPUT CODES The DAC701/702/703 accept complementary digital input codes in either binary format (CSB, unipolar or COB, bipolar). The COB models DAC702/703 may be connected by the user for either complementary offset binary (COB) or complementary two’s complement (CTC) codes (see Table I). Zero Drift Zero drift is a measure of the change in the output with FFFFH (DAC701) applied to the digital inputs over the specified temperature range. For the bipolar models, zero is measured at 7FFFH (bipolar zero) applied to the digital inputs. This code corresponds to zero volts (DAC703) or zero milliamps (DAC702) at the analog output. The maxi- mum 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 parts per million of full scale range per degree centigrade (ppm of 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. 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 (DAC703) or 10V (DAC701) 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. ANALOG OUTPUT DAC701 DAC702/703 DAC702/703 DIGITAL Complementary Complementary Complementary INPUT Straight Binary Offset Binary Two’s Complement CODES (CSB) (COB) (CTC)* 0000H + Full Scale + Full Scale –1LSB 7FFFH +1/2 Full Scale Bipolar Zero – Full Scale 8000H +1/2 Full Scale –1LSB + Full Scale –1LSB FFFFH Zero – Full Scale Bipolar Zero * Invert the MSB of the COB code with an external inverter to obtain CTC code. 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 (all bits ON point and all bits OFF point). Differential Linearity Error Differential linearity error (DLE) of a D/A converter is the deviation from an ideal 1LSB change in the output from one adjacent output state to the next. A differential linearity error specification of ±1/2LSB means that the output step sizes can be between 1/2LSB and 3/2LSB when the input changes from one adjacent input state to the next. A negative DLE specification of no more than –1LSB (–0.006% for 14-bit resolution) insures monotonicity. Monotonicity Monotonicity assures that the analog output will increase or remain the same for increasing input digital codes. The DAC701/702/703 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 for each D/A 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. FIGURE 1. Final-Value Error Band vs Full-Scale Range Settling Time. 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. Settling Time (µs) 0.01 0.1 1 10 1 0.1 0.01 0.001 DAC702 DAC701 DAC703 R L = 100Ω R L = 1kΩ |
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