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DAC2813AP Folha de dados(PDF) 7 Page - Burr-Brown (TI) |
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DAC2813AP Folha de dados(HTML) 7 Page - Burr-Brown (TI) |
7 / 9 page 7 ® DAC2813 DAC2813 can be used with two’s complement coding if a logic inverter is used ahead of the MSB input (DB11). DAC2813 can be connected for 0 to +10V unipolar opera- tion by using the BPO resistors, plus a 100 Ω series resistor, in parallel with the internal feedback resistor. In this case, an input code of 000 HEX gives zero volt output, an input of FFF HEX gives an output 1LSB below positive full scale. INTERNAL/EXTERNAL REFERENCE USE DAC2813 contains a +10V ±50mV voltage reference, V REF OUT. VREF OUT is available to drive external loads sourcing up to 2mA. The load current should be constant, otherwise the gain (and bipolar offset, if connected) of the D/A converters will vary. For DAC2813 V REF OUT must be connected to VREF IN 1 and V REF IN 2 through gain adjust resistors with a nominal value of 500 Ω. Trim potentiometers with a nominal value of 1000 Ω can be used to provide adjustment to zero gain error. It is possible to use references other than +10V. The recom- mended range of reference voltage is from +8V to +11V, which allows both 8.192V and 10.24V ranges to be used. However, DAC2813 is optimized for fixed-reference appli- cations. If the reference voltage is expected to time-vary over a wide range, a CMOS multiplying D/A is a better choice. HOLD time will be long, approximately 20ns to 30ns and this time will vary considerably in this range from unit to unit. DATA HOLD time using WR is 5ns max. RESET FUNCTION The Reset function resets only the D/A latch. Therefore, after a RESET, good data must be written to all the input latches before an LDAC – WR command is issued. Other- wise, old data or unknown data is present in the input latches and will be transferred to the D/A latch producing an analog output value that may be unwanted. LOGIC INPUT COMPATIBILITY DAC2813 digital inputs are TTL compatible (1.4V switch- ing level) over the operating range of +V CC. Each input has low leakage and high input impedance. Thus the inputs are suitable for being driven by any type of 5V logic. An equivalent circuit of a digital input is shown in Figure 1. Open DATA input lines will float to 7V or more. Although this will not harm the DAC2813, current spikes will occur in the input lines when a logic 0 is asserted and, in addition, the speed of the interface will be slower. A digital output driving a DATA input line of the DAC2813 must not drive, or let the DATA input float, above +5.5V. Unused DATA inputs should be connected to DCOM. Unused CONTROL inputs should be connected to a voltage greater than +2V but not greater than +5.5V. If this voltage is not available, the control inputs can be connected to +V CC through a 100k Ω resistor to limit the input current. FIGURE 1. Equivalent Digital Input Circuit. INPUT CODING DAC2813 accepts positive-true binary input codes. Input coding for bipolar analog outputs is Bipolar Offset Binary (BOB), where an input code of 000 HEX gives a minus full- scale output, an input of FFF HEX gives an output 1LSB below positive full scale, and zero occurs for an input code of 800 HEX. + Full Scale All Bits Logic 0 1LSB Range of Offset Adjust Offset Adj. Translates the Line Digital Input All Bits Logic 1 Full Scale Range Gain Adjust Rotates the Line – Full Scale MSB on All Others Off Bipolar Offset Range of Gain Adjust ≈ ±1% ≈ ±0.4% FIGURE 2. Relationship of Offset and Gain Adjustments for a Bipolar D/A Converter. ANALOG OUTPUT UNIPOLAR BIPOLAR DIGITAL INPUT 0 TO +10V ±10V FFF HEX +9.9976V +9.9951V 800 HEX +5.0000V 0.0000V 7FF HEX +4.9976V –0.0049V 000 HEX 0.0000V –10.0000V 1LSB 2.44mV 4.88mV TABLE III. Analog Output Calibration Values. DAC2813 DIGITAL INPUT R Ω Data, LDAC, WR, RESET 500 EN X 330 6.8V 10 to 20pF Digital Input DCOM I I R |
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Descrição semelhante - DAC2813AP |
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