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| 型号： | AD8305ACPZ-RL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 7/24页 |
| 文件大小： | 0K |
| 描述： | IC LOGARITH CONV 100DB 16-LFCSP |
| 设计资源： | Interfacing ADL5315 to Translinear Logarithmic Amplifier (CN0056) Interfacing ADL5317 High Side Current Mirror to a Translinear Logarithmic Amplifier in an Avalanche Photodiode Power Detector |
| 标准包装： | 1 |
| 类型： | 对数转换器 |
| 应用： | 光纤 |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-VFQFN 裸露焊盘，CSP |
| 供应商设备封装： | 16-LFCSP-VQ |
| 包装： | 标准包装 |
| 产品目录页面： | 550 (CN2011-ZH PDF) |
| 其它名称： | AD8305ACPZ-RL7DKR |
AD8305
Rev. B | Page 15 of 24
CALIBRATION
The AD8305 has a nominal slope and intercept of 200 mV/decade
and 1 nA, respectively. These values are untrimmed, and the
slope alone may vary as much as 7.5% over temperature. For
this reason, it is recommended that a simple calibration be done
to achieve increased accuracy.
IPD (A)
1.4
0
V
LO
G
(V
)
1.2
1.0
0.8
0.6
0.4
0.2
4
3
2
1
0
–1
–2
–3
IDEAL OUTPUT
CALIBRATED ERROR
MEASURED OUTPUT
UNCALIBRATED ERROR
ER
R
O
R
;d
B
(1
0m
V/
d
B
)
1n
10n
10
100
1m
10m
100n
1
03
05
3-
0
35
Figure 36. Using Two-Point Calibration to Increase Measurement Accuracy
Figure 36 shows the improvement in accuracy when using a two
point calibration method. To perform this calibration, apply
two known currents, I1 and I2, in the linear operating range
between 10 nA and 1 mA. Measure the resulting output, V1 and
V2, respectively, and calculate the slope m and intercept b.
m = (V1 V2)/[log10(I1) log10(I2)]
(7)
b = V1 – m × log10(I1)
(8)
The same calibration is performed with two known optical
powers, P1 and P2. This allows for calibration of the entire
measurement system while providing a simplified relationship
between the incident optical power and VLOG voltage.
m = (V1 V2)/(P1 P2)
(9)
b = V1 m × P1
(10)
The uncalibrated error line in Figure 36 is generated assuming
that the slope of the measured output was 200 mV/ decade
when in fact it was actually 194 mV/decade. Correcting for this
discrepancy decreased measurement error up to 3 dB.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD8305BRU | 制造商:Analog Devices 功能描述:- Bulk |
| AD8305-EVAL | 制造商:Analog Devices 功能描述:Evaluation Board For IC Log Amp Single 12V 制造商:Analog Devices 功能描述:AD8305 EVALUATION BOARD - Bulk |
| AD8305-EVALZ | 制造商:Analog Devices 功能描述:EVALUATION BOARDS - Bulk |
| AD8306 | 制造商:AD 制造商全称:Analog Devices 功能描述:5 MHz-400 MHz 100 dB High Precision Limiting-Logarithmic Amplifier |
| AD8306ACHIPS | 制造商:AD 制造商全称:Analog Devices 功能描述:5 MHz-400 MHz 100 dB High Precision Limiting-Logarithmic Amplifier |
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