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AD584TH Folha de dados(PDF) 9 Page - Analog Devices |
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AD584TH Folha de dados(HTML) 9 Page - Analog Devices |
9 / 12 page Data Sheet AD584 Rev. C | Page 9 of 12 The AD584 can also use an NPN or NPN Darlington transistor to boost its output current. Simply connect the 10 V output terminal of the AD584 to the base of the NPN booster and take the output from the booster emitter, as shown in Figure 13. The 5.0V pin or the 2.5V pin must connect to the actual output in this configuration. Variable or adjustable outputs (as shown in Figure 3 and Figure 4) can be combined with a 5.0 V connection to obtain outputs above 5.0 V. Figure 13. NPN Output Current Booster THE AD584 AS A CURRENT LIMITER The AD584 represents an alternative to current limiter diodes that require factory selection to achieve a desired current. Use of current limiting diodes often results in temperature coefficients of 1%/°C. Use of the AD584 in this mode is not limited to a set current limit; it can be programmed from 0.75 mA to 5 mA with the insertion of a single external resistor (see Figure 14). The minimum voltage required to drive the connection is 5 V. Figure 14. A Two-Component Precision Current Limiter NEGATIVE REFERENCE VOLTAGES FROM AN AD584 The AD584 can also be used in a 2-terminal Zener mode to provide a precision −10 V, −7.5 V, or −5.0 V reference. As shown in Figure 15, the VIN and VOUT terminals are connected together to the positive supply (in this case, ground). The AD584 COMMON pin is connected through a resistor to the negative supply. The output is now taken from the COMMON pin instead of VOUT. With 1 mA flowing through the AD584 in this mode, a typical unit shows a 2 mV increase in the output level over that produced in 3-terminal mode. Also, note that the effective output impedance in this connection increases from 0.2 Ω typical to 2 Ω. It is essential to arrange the output load and the supply resistor, RS, so that the net current through the AD584 is always between 1 mA and 5 mA (between 2 mA and 5 mA for operation beyond 85°C). The temperature characteristics and long-term stability of the device is essentially the same as that of a unit used in standard 3-terminal mode. Figure 15. 2-Terminal, −5 V Reference The AD584 can also be used in 2-terminal mode to develop a positive reference. VIN and VOUT are tied together and to the positive supply through an appropriate supply resistor. The performance characteristics are similar to those of a negative 2-terminal connection. The only advantage of this connection over the standard 3-terminal connection is that a lower primary supply can be used, as low as 0.5 V above the desired output voltage. This type of operation requires considerable attention to load and to the primary supply regulation to ensure that the AD584 always remains within its regulating range of 1 mA to 5 mA (2 mA to 5 mA for operation beyond 85°C). 10 V REFERENCE WITH MULTIPLYING CMOS DACs OR ADCs The AD584 is ideal for application with the AD7533 10-bit multiplying CMOS DAC, especially for low power applications. It is equally suitable for the AD7574 8-bit ADC. In the standard hook-up, as shown in Figure 16, the standard output voltages are inverted by the amplifier/DAC configuration to produce converted voltage ranges. For example, a +10 V reference produces a 0 V to −10 V range. If an OP1177 amplifier is used, total quiescent supply current is typically 2 mA. Figure 16. Low Power 10-Bit CMOS DAC Application AD584 1 10.0V 5.0V 2.5V 2 3 8 V+ 4 COMMON DARLINGTON NPN 2N6057 VOUT (5V, 12A AS SHOWN) 1kΩ RAW SUPPLY (≈5V > VOUT) AD584 1 VOUT = 2.5V 2.5V TAP 3 8 V+ 4 COMMON = i + 0.75mA 2.5V R RLOAD AD584 1 VOUT VREF –5V 5.0V TAP 2 8 V+ 4 COMMON –15V RS 2.4kΩ 5% ANALOG GND 1µF AD584 10.0V V+ 1 8 4 COMMON +15V AD7533 4 BIT 1 (MSB) 5 DIGITAL INPUT 13 16 1 2 BIT 10 (LSB) 15 3 14 VREF +15V –15V VOUT 0V TO –10V RFB IOUT1 IOUT2 COMMON |
Nº de peça semelhante - AD584TH |
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Descrição semelhante - AD584TH |
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