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5962-8865901XA 参数 Datasheet PDF下载

5962-8865901XA图片预览
型号: 5962-8865901XA
PDF下载: 下载PDF文件 查看货源
内容描述: [Microprocessor-Compatible 12-Bit D/A Converter]
分类和应用: 转换器
文件页数/大小: 8 页 / 325 K
品牌: ADI [ ADI ]
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AD667  
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 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.  
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.  
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.  
Figure 2. 0 V to +10 V Unipolar Voltage Output  
STEP I . . . ZERO ADJUST  
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.  
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 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.)  
Reduced values of reference voltage will also permit the ±12  
volt ± 5% power supply requirement to be relaxed to ±12 volts  
± 10%.  
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).  
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.  
STEP I . . . OFFSET ADJUST  
Turn OFF all bits. Adjust 100 trimmer R1 to give –5.000  
volts output.  
STEP II . . . GAIN ADJUST  
Turn ON all bits. Adjust 100 gain trimmer R2 to give a read-  
ing of +4.9976 volts.  
REV. A  
–5–