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参数资料
| 型号： | AD8400ARZ50-REEL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 16/32页 |
| 文件大小： | 0K |
| 描述： | IC POT DGTL 8BIT 50K 1CH 8SOIC |
| 标准包装： | 2,500 |
| 接片： | 256 |
| 电阻（欧姆）： | 50k |
| 电路数： | 1 |
| 温度系数： | 标准值 500 ppm/°C |
| 存储器类型： | 易失 |
| 接口： | 3 线 SPI（芯片选择） |
| 电源电压： | 2.7 V ~ 5.5 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SO |
| 包装： | 带卷 (TR) |
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AD8400/AD8402/AD8403
Rev. E | Page 23 of 32
1k
Ω
DIGITAL
PINS
LOGIC
01
09
2-
05
0
Figure 51. Equivalent ESD Protection Circuits
20
Ω
A,B,W
01
09
2
-05
1
Figure 52. Equivalent ESD Protection Circuit (Analog Pins)
A
CA
CB
W
RDAC
10k
Ω
B
CW
120pF
CA = 90.4pF (DW/256) + 30pF
CB = 90.4pF [1 – (DW/256)] + 30pF
01
09
2-
05
2
Figure 53. RDAC Circuit Simulation Model for RDAC = 10 kΩ
The AC characteristics of the RDAC are dominated by the
internal parasitic capacitances and the external capacitive loads.
The 3 dB bandwidth of the AD8403AN10 (10 kΩ resistor)
measures 600 kHz at half scale as a potentiometer divider.
Figure 30 provides the large signal Bode plot characteristics
of the three available resistor versions 10 kΩ, 50 kΩ, and 100 kΩ.
The gain flatness vs. frequency graph of the 1 kΩ version predicts
filter applications performance (see Figure 33). A parasitic
simulation model has been developed and is shown in Figure 53.
Listing I provides a macro model net list for the 10 kΩ RDAC.
Listing I. Macro Model Net List for RDAC
.PARAM DW=255, RDAC=10E3
*
.SUBCKT DPOT (A,W,)
*
CA A 0 {DW/256*90.4E-12+30E-12}
RAW A W {(1-DW/256)*RDAC+50}
CW W 0 120E-12
RBW W B {DW/256*RDAC+50}
CB B 0 {(1-DW/256)*90.4E-12+30E-12}
*
.ENDS DPOT
The total harmonic distortion plus noise (THD + N), shown in
Figure 41, is measured at 0.003% in an inverting op amp circuit
using an offset ground and a rail-to-rail OP279 amplifier.
Thermal noise is primarily Johnson noise, typically 9 nV/√Hz
for the 10 kΩ version at f = 1 kHz. For the 100 kΩ device,
thermal noise becomes 29 nV/√Hz. Channel-to-channel
crosstalk measures less than 65 dB at f = 100 kHz. To achieve
this isolation, the extra ground pins provided on the package to
segregate the individual RDACs must be connected to circuit
ground. AGND and DGND pins should be at the same voltage
potential. Any unused potentiometers in a package should be
connected to ground. Power supply rejection is typically 35 dB
at 10 kHz. Care is needed to minimize power supply ripple in
high accuracy applications.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD8401 | 制造商:AD 制造商全称:Analog Devices 功能描述:8-Bit, 4-Channel Data Acquisition System |
| AD8401AR | 制造商:Rochester Electronics LLC 功能描述:8-BIT,4-CHANNEL A/D CONV - Bulk 制造商:Analog Devices 功能描述: |
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| AD8402 | 制造商:AD 制造商全称:Analog Devices 功能描述:2-Channel, 256-Position Digital Potentiometer |
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