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DAC813 Datasheet(PDF) 6 Page - Texas Instruments |
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DAC813 Datasheet(HTML) 6 Page - Texas Instruments |
6 / 16 page ® 6 DAC813 20 10 0 –10 –20 –40 –2 Time (µs) SETTLING TIME, –10V TO +10V +5 0 02468 10 12 14 V OUT WR V OUT 1LSB = 4.88mV 20 10 0 –10 –20 –2 Time (µs) SETTLING TIME, +10V TO –10V +5 0 0 2 4 6 8 10 12 1LSB = 4.88mV V OUT WR TYPICAL PERFORMANCE CURVES (CONT) At TA = +25°C, VCC = ±15V, unless otherwise noted. DISCUSSION OF SPECIFICATIONS INPUT CODES The DAC813 accepts positive-true binary input codes. DAC813 may be connected by the user for any one of the following codes: USB (Unipolar Straight Binary), BOB (Bipolar Offset Binary) or, using an external inverter on the MSB line, BTC (Binary Two’s Complement). See Table I. MONOTONICITY A D/A converter is monotonic if the output either increases or remains the same for increasing digital inputs. All grades of DAC813 are monotonic over their specification tempera- ture range. DRIFT Gain Drift is a measure of the change in the Full Scale Range (FSR) output over the specification temperature range. Gain Drift is expressed in parts per million per degree Celsius (ppm/ °C). Unipolar Offset Drift is measured with a data input of 000HEX. The D/A is configured for unipolar output. Unipolar Offset Drift is expressed in parts per million of Full Scale Range per degree Celsius (ppm of FSR/ °C). Bipolar Zero Drift is measured with a data input of 800HEX. The D/A is configured for bipolar output. Bipolar Zero Drift is expressed in parts per million of Full Scale Range per degree Celsius (ppm of FSR/ °C). SETTLING TIME Settling Time is the total time (including slew time) for the output to settle within an error band around its final value after a change in input. Three settling times are specified to ±0.012% of Full Scale Range (FSR): two for maximum full scale range changes of 20V and 10V, and one for a 1LSB change. The 1LSB change is measured at the major carry (7FFHEX to 800HEX and 800HEX to 7FFHEX), the input tran- sition at which worst-case settling time occurs. REFERENCE SUPPLY DAC813 contains an on-chip +10V reference. This voltage (pin 6) has a tolerance of ±50mV. V REF OUT must be con- nected to VREF IN through a gain adjust resistor with a nominal value of 500 Ω. The connection can be made through an optional 1k Ω trim resistor to provide adjustment to zero DIGITAL ANALOG OUTPUT INPUT USB BOB BTC* Unipolar Bipolar Binary Straight Offset Two’s MSB to LSB Binary Binary Complement FFFHEX + Full Scale + Full Scale Zero – 1LSB 800HEX + 1/2 Full Scale Zero – Full Scale 7FFHEX + 1/2 Full Scale – 1LSB Zero – 1LSB + Full Scale 000HEX Zero – Full Scale Zero * Invert MSB of BOB code with external inverter to obtain BTC code. TABLE I. Digital Input Codes. LINEARITY ERROR Linearity error as used in D/A converter specifications by Burr-Brown is the deviation of the analog output from a straight line drawn between the end points (inputs all “1s” and all “0s”). The DAC813 linearity error is specified at ±1/4LSB (max) at +25°C K grades, and ±1/2LSB (max) for J grades. DIFFERENTIAL LINEARITY ERROR Differential linearity error (DLE) is the deviation from a 1LSB output change from one adjacent state to the next. A DLE specification of 1/2LSB means that the output step size can range from 1/2LSB to 3/2LSB when the input changes from one state to the next. Monotonicity requires that DLE be less than 1LSB over the temperature range of interest. |
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