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AD667KN Arkusz danych(PDF) 5 Page - Analog Devices |
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AD667KN Arkusz danych(HTML) 5 Page - Analog Devices |
5 / 8 page AD667 REV. A –5– ANALOG CIRCUIT CONNECTIONS Internal scaling resistors provided in the AD667 may be connected to produce bipolar output voltage ranges of ±10, ±5 or ±2.5 V or unipolar output voltage ranges of 0 V to +5 V or 0 V to +10 V. Gain and offset drift are minimized in the AD667 because of the thermal tracking of the scaling resistors with other device com- ponents. Connections for various output voltage ranges are shown in Table I. Figure 1. Output Amplifier Voltage Range Scaling Circuit UNIPOLAR CONFIGURATION (Figure 2) This configuration will provide a unipolar 0 volt to +10 volt out- put range. In this mode, the bipolar offset terminal, Pin 4, should be grounded if not used for trimming. Figure 2. 0 V to +10 V Unipolar Voltage Output STEP I . . . ZERO ADJUST Turn all bits OFF and adjust zero trimmer R1, until the output reads 0.000 volts (1 LSB = 2.44 mV). In most cases this trim is not needed, and Pin 4 should be connected to Pin 5. STEP II . . . GAIN ADJUST Turn all bits ON and adjust 100 Ω gain trimmer R2, until the output is 9.9976 volts. (Full scale is adjusted to 1 LSB less than nominal full scale of 10.000 volts.) BIPOLAR CONFIGURATION (Figure 3) This configuration will provide a bipolar output voltage from –5.000 to +4.9976 volts, with positive full scale occurring with all bits ON (all 1s). STEP I . . . OFFSET ADJUST Turn OFF all bits. Adjust 100 Ω trimmer R1 to give –5.000 volts output. STEP II . . . GAIN ADJUST Turn ON all bits. Adjust 100 Ω gain trimmer R2 to give a read- ing of +4.9976 volts. Figure 3. ±5 V Bipolar Voltage Output INTERNAL/EXTERNAL REFERENCE USE The AD667 has an internal low noise buried Zener diode refer- ence which is trimmed for absolute accuracy and temperature coefficient. This reference is buffered and optimized for use in a high speed DAC and will give long-term stability equal or superior to the best discrete Zener reference diodes. The performance of the AD667 is specified with the internal reference driving the DAC since all trimming and testing (especially for full-scale error and bipolar offset) is done in this configuration. The internal reference has sufficient buffering to drive external circuitry in addition to the reference currents required for the DAC (typically 0. 5 mA to Ref In and 1.0 mA to Bipolar Off- set). A minimum of 0.1 mA is available for driving external loads. The AD667 reference output should be buffered with an external op amp if it is required to supply more than 0.1 mA output current. The reference is typically trimmed to ±0.2%, then tested and guaranteed to ±1.0% max error. The tempera- ture coefficient is comparable to that of the full-scale TC for a particular grade. If an external reference is used (10.000 V, for example), addi- tional trim range must be provided, since the internal reference has a tolerance of ±1%, and the AD667 full-scale and bipolar offset are both trimmed with the internal reference. The gain and offset trim resistors give about ±0.25% adjustment range, which is sufficient for the AD667 when used with the internal reference. It is also possible to use external references other than 10 volts. The recommended range of reference voltage is from +8 to +11 volts, which allows both 8.192 V and 10.24 V ranges to be used. The AD667 is optimized for fixed-reference applications. If the reference voltage is expected to vary over a wide range in a particular application, a CMOS multiplying DAC is a better choice. Reduced values of reference voltage will also permit the ±12 volt ± 5% power supply requirement to be relaxed to ±12 volts ± 10%. It is not recommended that the AD667 be used with external feedback resistors to modify the scale factor. The internal resis- tors are trimmed to ratio-match and temperature-track the other resistors on the chip, even though their absolute tolerances are ±20%, and absolute temperature coefficients are approximately –50 ppm/ °C. If external resistors are used, a wide trim range ( ±20%) will be needed and temperature drift will be increased to reflect the mismatch between the temperature coefficients of the internal and external resistors. |
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