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| 型號： | AD8293G80BRJZ-RL |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 2/16頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP INST R-R LDRIFT SOT23-8 |
| 標準包裝： | 10,000 |
| 放大器類型： | 儀表 |
| 電路數(shù)： | 1 |
| 輸出類型： | 滿擺幅 |
| -3db帶寬： | 500Hz |
| 電流 - 輸入偏壓： | 400pA |
| 電壓 - 輸入偏移： | 9µV |
| 電流 - 電源： | 1mA |
| 電流 - 輸出 / 通道： | 35mA |
| 電壓 - 電源，單路/雙路(±)： | 1.8 V ~ 5.5 V，±0.9 V ~ 2.75 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | SOT-23-8 |
| 供應商設(shè)備封裝： | SOT-23-8 |
| 包裝： | 帶卷 (TR) |
AD8293G80/AD8293G160
Rev. 0 | Page 10 of 16
THEORY OF OPERATION
The AD8293G80/AD8293G160 are precision current-mode
correction instrumentation amplifiers capable of single-supply
operation. The current-mode correction topology results in
excellent accuracy. Figure 18 shows a simplified diagram
illustrating the basic operation of the AD8293G80/AD8293G160
(without correction). The circuit consists of a voltage-to-current
amplifier (M1 to M6), followed by a current-to-voltage amplifier
(R2 and A1). Application of a differential input voltage forces a
current through External Resistor R1, resulting in conversion of
the input voltage to a signal current. Transistor M3 to Transistor
M6 transfer twice this signal current to the inverting input of
the op amp A1. Amplifier A1 and External Resistor R2 form
a current-to-voltage converter to produce a rail-to-rail output
voltage at VOUT.
Op amp A1 is a high precision auto-zero amplifier. This amplifier
preserves the performance of the autocorrecting, current-mode
amplifier topology while offering the user a true voltage-in,
voltage-out instrumentation amplifier. Offset errors are corrected
internally.
An external reference voltage is applied to the noninverting
input of A1 to set the output reference level. External Capacitor
C2 is used to filter out correction noise.
HIGH PSR AND CMR
Common-mode rejection and power supply rejection indicate
the amount that the offset voltage of an amplifier changes when
its common-mode input voltage or power supply voltage changes.
The autocorrection architecture of the AD8293G80/AD8293G160
continuously corrects for offset errors, including those induced
by changes in input or supply voltage, resulting in exceptional
rejection performance. The continuous autocorrection provides
great CMR and PSR performances over the entire operating
temperature range (40°C to +85°C).
The parasitic resistance in series with R2 does not degrade CMR,
but causes a small gain error and a very small offset error.
Therefore, an external buffer amplifier is not required to drive
VREF to maintain excellent CMR performance. This helps reduce
system costs over conventional instrumentation amplifiers.
1/f NOISE CORRECTION
Flicker noise, also known as 1/f noise, is noise inherent in the
physics of semiconductor devices and decreases 10 dB per decade.
The 1/f corner frequency of an amplifier is the frequency at which
the flicker noise is equal to the broadband noise of the amplifier. At
lower frequencies, flicker noise dominates, causing large errors
in low frequency or dc applications.
Flicker noise is seen effectively as a slowly varying offset
error, which is reduced by the autocorrection topology of the
AD8293G80/AD8293G160. This allows the AD8293G80/
AD8293G160 to have lower noise near dc than standard low
noise instrumentation amplifiers.
II
I – IR1
M2
VINP
M3
M4
M1
R1
(VINP – VINN)
IR1 =
R1
2I
VINN
VBIAS
M5
M6
I – IR1
I + IR1
2IR1
C2
R2
R3
A1
VINP – VINN
R1
2R2
VOUT = VREF
VREF
EXTERNAL
+
07
45
1-
02
0
VCC
C3
Figure 18. Simplified Schematic
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| TSW-121-08-S-D | CONN HEADER 42POS .100" DL GOLD |
| AD8293G160BRJZ-RL | IC AMP INST R-R LDRIFT SOT23-8 |
| TSW-122-08-S-D | CONN HEADER 44POS .100" DL GOLD |
| AD8293G160BRJZ-R7 | IC AMP INST R-R LDRIFT SOT23-8 |
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