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參數(shù)資料
| 型號： | AD8203YRZ-RL |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 8/20頁 |
| 文件大小： | 0K |
| 描述： | IC AMP DIFF 60KHZ 8SOIC |
| 標準包裝： | 2,500 |
| 放大器類型： | 差分 |
| 電路數(shù)： | 1 |
| 轉(zhuǎn)換速率： | 0.330 V/µs |
| 增益帶寬積： | 60kHz |
| 電流 - 輸入偏壓： | 40nA |
| 電壓 - 輸入偏移： | 1000µV |
| 電流 - 電源： | 250µA |
| 電壓 - 電源，單路/雙路(±)： | 3.5 V ~ 12 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 供應商設備封裝： | 8-SO |
| 包裝： | 帶卷 (TR) |
AD8203
Data Sheet
Rev. D | Page 16 of 20
40log (f2/f1)
f1
ATTENUATION
f2
f22/f1
FREQUENCY
A 1-POLE FILTER, CORNER f1, AND
A 2-POLE FILTER, CORNER f2, HAVE
THE SAME ATTENUATION –40log (f2/f1)
AT FREQUENCY f22/f1
20dB/DECADE
40dB/DECADE
05013-021
Figure 48. Comparative Responses of 1-Pole and 2-Pole Low-Pass Filters
HIGH LINE CURRENT SENSING WITH LPF AND
GAIN ADJUSTMENT
Figure 49 is another refinement of Figure 2, including gain
adjustment and low-pass filtering.
GND
NC
–IN
+IN
A1
+VS
A2
OUT
AD8203
5V
INDUCTIVE
LOAD
POWER
DEVICE
4-TERM
SHUNT
CLAMP
DIODE
BATTERY
14V
NC = NO CONNECT
COMMON
05013-022
C
OUT
4V/AMP
5% CALIBRATION RANGE
fC(Hz) = 0.767Hz/C(F)
(0.22
F FOR f
C = 3.6Hz)
VOS/IB
NULL
133k
20k
Figure 49. High Line Current Sensor Interface;
Gain = ×40, Single-Pole Low-Pass Filter
A power device that is either on or off controls the current in
the load. The average current is proportional to the duty cycle
of the input pulse and is sensed by a small value resistor. The
average differential voltage across the shunt is typically 100 mV,
although its peak value is higher by an amount that depends on
the inductance of the load and the control frequency. The
common-mode voltage, conversely, extends from roughly 1 V
above ground for the on condition to about 1.5 V above the
battery voltage for the off condition. The conduction of the
clamping diode regulates the common-mode potential applied
to the device. For example, a battery spike of 20 V may result in
an applied common-mode potential of 21.5 V to the input of
the devices.
To produce a full-scale output of 4 V, a gain ×40 is used, adjust-
able by ±5% to absorb the tolerance in the shunt. There is
sufficient headroom to allow 10% overrange (to 4.4 V). The
roughly triangular voltage across the sense resistor is averaged
by a 1-pole low-pass filter, shown in Figure 49, set with a corner
frequency of 3.6 Hz, which provides about 30 dB of attenuation
at 100 Hz. A higher rate of attenuation can be obtained using a
this circuit uses two separate capacitors, the total capacitance is
less than half that needed for the 1-pole filter.
GND
NC
–IN
+IN
A1
+VS
A2
OUT
AD8203
5V
INDUCTIVE
LOAD
POWER
DEVICE
4-TERM
SHUNT
CLAMP
DIODE
BATTERY
14V
NC = NO CONNECT
COMMON
05013-023
fC(Hz) = 1/C(F)
(0.05
F FOR f
C = 20Hz)
C
OUTPUT
93k
C
301k
50k
Figure 50. 2-Pole Low-Pass Filter
DRIVING CHARGE REDISTRIBUTION ADCS
When driving CMOS ADCs, such as those embedded in popu-
lar microcontrollers, the charge injection (ΔQ) can cause a
significant deflection in the output voltage of the AD8203.
Though generally of short duration, this deflection may persist
until after the sample period of the ADC has expired due to the
relatively high open-loop output impedance (21 k) of the
AD8203. Including an R-C network in the output can signifi-
cantly reduce the effect. The capacitor helps to absorb the
transient charge, effectively lowering the high frequency output
impedance of the AD8203. For these applications, the output
signal should be taken from the midpoint of the
Since the perturbations from the analog-to-digital converter are
small, the output impedance of the AD8203 appears to be low. The
transient response, therefore, has a time constant governed by the
product of the two LAG components, CLAG × RLAG. For the values
shown in Figure 51, this time constant is programmed at approxi-
mately 10 s. Therefore, if samples are taken at several tens of
microseconds or more, there is negligible charge stack-up.
+IN
–IN
10k
10k
AD8203
5V
R
LAG
1k
C
LAG
0.01
F
MICROPROCESSOR
A/D
A2
2
4
7
5
05013-024
Figure 51. Recommended Circuit for Driving CMOS A/D
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