参数资料
| 型号： | AD5522JSVDZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 36/64页 |
| 文件大小： | 0K |
| 描述： | IC PMU QUAD 16BIT DAC 80-TQFP |
| 产品变化通告： | Improve FI ac crosstalk |
| 设计资源： | Parametric Measurement Unit and Supporting Components for PAD Appls Using AD5522 and AD7685 (CN0104) |
| 标准包装： | 1 |
| 类型： | 每引脚参数测量单元（PPMU） |
| 应用： | 自动测试设备 |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 80-TQFP 裸露焊盘 |
| 供应商设备封装： | 80-TQFP（12x12） |
| 包装： | 托盘 |
| 产品目录页面： | 798 (CN2011-ZH PDF) |
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Data Sheet
AD5522
Rev. E | Page 41 of 64
FORCE CURRENT (FI) MODE
In force current (FI) mode, the voltage at the FIN DAC is
converted to a current and is applied to the DUT. The feedback
path is the measure current amplifier, feeding back the voltage
measured across the sense resistor. MEASOUTx reflects the
voltage measured across the DUT (see Figure 55).
For the suggested current ranges, the maximum voltage drop
across the sense resistors is ±1 V. However, to allow for error
correction, there is some overrange available in the current
ranges. The maximum full-scale voltage range that can be
loaded to the FIN DAC is ±11.5 V. The forced current can be
calculated as follows:
FI = 4.5 × VREF × ((DAC_CODE 32,768)/216)/(RSENSE ×
MI_Amplifier_Gain)
where:
FI is the forced current.
RSENSE is the selected sense resistor.
MI_Amplifier_Gain is the gain of the measure current
instrumentation amplifier. This gain can be set to 5 or
10 via the serial interface.
The ISENSE amplifier is biased by the offset DAC output voltage in
such a way as to center the measure current output regardless of
the voltage span used.
In the ±200 μA range with the 5 kΩ sense resistor and an ISENSE
gain of 10, the maximum current range possible is ±225 μA.
Similarly, for the other current ranges, there is an overrange of
12.5% to allow for error correction.
DUTGND
DUT
RSENSE
FIN
INTERNAL RANGE SELECT
(±5A, ±20A, ±200A, ±2mA)
DAC
–
+
–
+
×5 OR
×10
×1
AGND
VMID TO
CENTER
I RANGE
06197-
034
RSENSE
(UP TO
±80mA)
MEASVHx
EXTMEASIHx
EXTMEASILx
FOHx
EXTFOHx
CFFx
MEASOUTx
FORCE
AMPLIFIER
MEASURE CURRENT
AMPLIFIER
×1 OR
×0.2
4k
2k
4k
Figure 55. Forcing Current, Measuring Voltage
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