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DAC4813 데이터시트(PDF) 8 Page - Burr-Brown (TI) |
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DAC4813 데이터시트(HTML) 8 Page - Burr-Brown (TI) |
8 / 8 page ® DAC4813 8 INTERNAL/EXTERNAL REFERENCE USE DAC4813 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. Because of the lack of additional pins required for external reference inputs, V REF OUT is connected internally to all 4 D/A converters. V REF OUT is available for external use on pin 28. GAIN AND OFFSET ADJUSTMENTS DAC4813 has no Gain and Offset Adjustment option. INSTALLATION POWER SUPPLY CONNECTIONS Power supply decoupling capacitors should be added. Best settling time performance occurs using a 1 to 10 µF tantalum capacitor at –V CC. Applications with less critical settling time may be ale to use 0.01 µF at –V CC as well as at +V CC . The capacitors should be located close to the package. DAC4813 features separate digital and analog power supply returns to permit optimum connections for low noise and high speed performance. It is recommended that both DIGI- TAL COMMON (DCOM) and ANALOG COMMON (ACOM) be connected directly to a ground plane under the package. If a ground place is not used, connect the ACOM and DCOM pins together close to the package. Since the reference point for V OUT and VREF OUT is the ACOM pin, it is also important to connect the load directly to the ACOM pin. The change in current in the ACOM pin due to an input date word change from 000 HEX to FFFHEX is only 1mA for each D/A converter. OUTPUT VOLTAGE SWING AND RANGE CONNECTIONS DAC4813 output amplifiers provide a ±10V output swing while operating on supplies as low as ±12V ±5%. DAC4813 is fully committed to ±10V output ranges. Op- tional ranges are not pin programmable. 12- AND 16-BIT BUS INTERFACES DAC4813 data is latched into the input latches of each D/A by asserting low each ENx individually and transferring the data from the bus to each input latch by asserting WR low. All D/A outputs in each package are then updated simulta- neously by asserting LDAC and WR low. Be sure to read the CAUTION statement in the LOGIC INPUT COMPATIBILITY section. 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 DAC4813 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 DAC4813, 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 DAC4813 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. 6.8V 10 to 20pF Digital Input DCOM I I R DAC4813 DIGITAL INPUT R Ω Data, LDAC, WR, RESET 250 EN X 330 INPUT CODING DAC4813 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. DAC4813 can be used with two's complement coding if a logic inverter is used ahead of the MSB input (DB11). |
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