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DAC813AUG4 Datasheet(PDF) 9 Page - Texas Instruments |
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DAC813AUG4 Datasheet(HTML) 9 Page - Texas Instruments |
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9 / 16 page  9 ® DAC813 FIGURE 5. Power Supply, Gain, and Offset Connections. 200 Ω 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 1k Ω V OUT 3M Ω 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 1k Ω V OUT –V CC 10k to 100k BIPOLAR UNIPOLAR (2) (1) 10µF tantalum for optimum settling performance. (2) Unipolar offset is not necessary in most applications and can lead to noise pickup. (3) Note that for the ceramic package the lid is connected to –V Ω Ω ++ 0.01µF 0.01µF +V CC CC . L REF OUT REF IN CC OUT CC V 20V Range 20V Range BPO ACOM V V +V V –V WR LDAC Reset LMSB D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 DCOM LLSB (1) 0.01µF (1) 0.01µF 0.01µF L REF OUT REF IN CC OUT CC V 20V Range 20V Range BPO ACOM V V +V V –V WR LDAC Reset LMSB D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 DCOM LLSB +V CC +V CC –V CC (3) –V CC (3) DAC813 features separate digital and analog power supply returns to permit optimum connections for low noise and high speed performance. It is recommended that both Ana- log Common (ACOM, Pin 5) and Digital Common (DCOM, Pin 16) be connected directly to a ground plane under the package. If a ground plane is not used, connect the ACOM and DCOM pins together close to the package. Since the reference point for VOUT and VREF OUT is the ACOM pin, it is also important to connect the load directly to the ACOM pin. Refer to Figure 5. The change in current in the Analog Common pin (ACOM, Pin 5) due to an input data word change from 000HEX to FFFHEX is only 800µA. OUTPUT RANGE CONNECTIONS Internal scaling resistors provided in the DAC813 may be connected to produce bipolar output voltage ranges of ±10V and ±5V or unipolar output voltage range of 0 to +10V. Refer to Figure 6. The internal feedback resistors (25k Ω) and the bipolar offset resistor (24.9k Ω) are trimmed to an absolute tolerance of less than ±2%. Therefore, one can change the range by adding a series resistor in various feedback circuit configu- rations. For example, a 600 Ω resistor in series with the 20V range terminal can be used to obtain a 20.48V ( ±10.24V) range (5mV LSB). A 7.98k Ω resistor in series with the 10V range connection (20V ranges in parallel) gives a 16.384V ( ±8.192V) bipolar range (4mV LSB). Gain drift will be affected by the mismatch of the temperature coefficient of the external resistor with the internal D/A resistors. APPLICATIONS MICROCOMPUTER BUS INTERFACING The DAC813 interface logic allows easy interface to micro- computer bus structures. The control signal is derived from external device select logic and the I/O Write or Memory Write (depending upon the system design) signals from the microcomputer. The latch enable lines LMSB, LLSB, and LDAC determine which of the latches are selected. It is permissible to enable two or more latches simultaneously, as shown in some of the following examples. The double-buffered latch permits data to be loaded into the input latches of several DAC813s and later strobed into the D/A latch of all D/As, simultaneously updating all analog outputs. All the interface schemes shown below use a base address decoder. If blocks of memory are used, the base address decoder can be simplified or eliminated altogether. 8-BIT INTERFACE The control logic of DAC813 permits interfacing to right- justified data formats, illustrated in Figure 7. When a 12-bit D/A converter is loaded from an 8-bit bus, two bytes of data are required. Figure 8 illustrates an addressing scheme for right-justified data. The base address is decoded from the high-order address bits. A0 and A1 address the appropriate latches. Note that adjacent addresses are used. X10HEX loads the 8 LSBs and X01HEX loads the 4 MSBs and simultane- ously transfers input latch data to the D/A latch. Addresses X00HEX and X11HEX are not used. |
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