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| 型號： | AD8202YRMZ-RL |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 6/20頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP DIFF 50KHZ 8MSOP |
| 產(chǎn)品培訓(xùn)模塊： | Current Sense Amplifiers |
| 標(biāo)準(zhǔn)包裝： | 3,000 |
| 放大器類型： | 差分 |
| 電路數(shù)： | 1 |
| 轉(zhuǎn)換速率： | 0.28 V/µs |
| 增益帶寬積： | 50kHz |
| 電流 - 輸入偏壓： | 40nA |
| 電壓 - 輸入偏移： | 2000µV |
| 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-TSSOP，8-MSOP（0.118"，3.00mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-MSOP |
| 包裝： | 帶卷 (TR) |
AD8202
Data Sheet
Rev. H | Page 14 of 20
APPLICATIONS
The AD8202 difference amplifier is intended for applications that
require extracting a small differential signal in the presence of
large common-mode voltages. The differential input resistance
is nominally 325 k, and the device can tolerate common-mode
voltages higher than the supply voltage and lower than ground.
The open collector output stage sources current to within
20 mV of ground and to within 200 mV of VS.
CURRENT SENSING
High Line, High Current Sensing
Basic automotive applications using the large common-mode
range are shown in Figure 2 and Figure 3. The capability of the
device to operate as an amplifier in primary battery supply
circuits is shown in Figure 2; Figure 3 illustrates the ability
of the device to withstand voltages below system ground.
Low Current Sensing
The AD8202 is also used in low current sensing applications, such
as the 4 to 20 mA current loop shown in Figure 42. In such
applications, the relatively large shunt resistor can degrade the
common-mode rejection. Adding a resistor of equal value on the
low impedance side of the input corrects for this error.
5V
OUTPUT
10
1%
10
1%
NC = NO CONNECT
+
GND
NC
–IN
+IN
A1
+VS
A2
OUT
AD8202
04981-015
Figure 42. 4 to 20 mA Current Loop Receiver
GAIN ADJUSTMENT
The default gain of the preamplifier and buffer are ×10 and ×2,
respectively, resulting in a composite gain of ×20. With the
addition of external resistor(s) or trimmer(s), the gain can be
lowered, raised, or finely calibrated.
Gains Less than 20
Because the preamplifier has an output resistance of 100 k,
an external resistor connected from Pin 3 and Pin 4 to GND
decreases the gain by a factor REXT/(100 k + REXT) as shown
10k
10k
100k
A2
A1
GND
–IN
OUT
+VS
NC
+IN
AD8202
OUT
+VS
REXT
VCM
VDIFF
2
GAIN =
20REXT
REXT + 100k
REXT = 100k
GAIN
20 – GAIN
VDIFF
2
NC = NO CONNECT
04981-016
Figure 43. Adjusting for Gains Less than 20
The overall bandwidth is unaffected by changes in gain by using
this method, although there may be a small offset voltage due
to the imbalance in source resistances at the input to the buffer.
This can often be ignored, but if desired, it can be nulled by
inserting a resistor equal to 100 k minus the parallel sum of REXT
and 100 k, in series with Pin 4. For example, with REXT = 100 k
(yielding a composite gain of ×10), the optional offset nulling
resistor is 50 k.
Gains Greater Than 20
Connecting a resistor from the output of the buffer amplifier
to its noninverting input, as shown in Figure 44, increases the
gain. The gain is multiplied by the factor REXT/(REXT 100 k);
for example, the gain is doubled for REXT = 200 k. Overall
gains as high as 50 are achievable in this way. The accuracy of
the gain becomes critically dependent on the resistor value at
high gains. Also, the effective input offset voltage at Pin 1 and
Pin 8 (about six times the actual offset of A1) limits the part’s
use in high gain, dc-coupled applications.
10k
10k
100k
A2
A1
GND
–IN
OUT
+VS
NC
+IN
AD8202
OUT
+VS
REXT
VCM
VDIFF
2
GAIN =
20REXT
REXT – 100k
REXT = 100k
GAIN
GAIN – 20
VDIFF
2
NC = NO CONNECT
04981-017
Figure 44. Adjusting for Gains > 20
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