參數(shù)資料
型號(hào)： OP497FS
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 5/16頁(yè)
文件大小： 0K
描述： IC OPAMP GP 500KHZ QUAD 16SOIC
標(biāo)準(zhǔn)包裝： 47
放大器類型： 通用
電路數(shù)： 4
轉(zhuǎn)換速率： 0.15 V/µs
增益帶寬積： 500kHz
電流 - 輸入偏壓： 40pA
電壓 - 輸入偏移： 40µV
電流 - 電源： 525µA
電流 - 輸出 / 通道： 25mA
電壓 - 電源，單路/雙路(±)： ±2 V ~ 20 V
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 16-SOIC（0.295"，7.50mm 寬）
供應(yīng)商設(shè)備封裝： 16-SOIC W
包裝： 管件
OP497
Rev. E | Page 13 of 16
NONLINEAR CIRCUITS
Due to its low input bias currents, the OP497 is an ideal log
amplifier in nonlinear circuits, such as the squaring amplifier
and square root amplifier circuits shown in Figure 40 and
Figure 41. Using the squaring amplifier circuit in Figure 40
as an example, the analysis begins by writing a voltage loop
equation across Transistors Q1, Q2, Q3, and Q4.
+
=
+
S4
REF
T4
S3
O
T3
S2
IN
T2
S1
IN
T1
I
In
V
I
In
V
I
In
V
I
In
V
All the transistors in the MAT04 are precisely matched and at
the same temperature; therefore, the IS and VT terms cancel,
giving
2InIIN
= InIO + InIREF = In (IO × IREF)
Exponentiating both sides of the thick equation lead to
()
REF
IN
O
I
2
=
Op amp A2 forms a current-to-voltage converter which results
in VOUT = R2 × IO. Substituting (VIN/R1) for IIN and the previous
equation for IO yields
2
=
R1
V
I
R2
V
IN
REF
OUT
1
2
3
6
7
5
C1
100pF
V+
2
3
8
1
4
V–
6
5
7
IO
9
8
10
Q1
Q3
Q2
14
12
Q4
13
IREF
MAT04
1/4
OP497
1/4
OP497
A2
A1
IIN
VIN
R1
133k
–15V
R3
50k
R4
50k
C2
100pF
R2
33k
VOUT
00
30
9-
0
41
Figure 40. Squaring Amplifier
A similar analysis made for the square root amplifier circuit in
Figure 41 leads to its transfer function
( )(
)
R1
I
V
R2
V
REF
IN
OUT =
In these circuits, IREF is a function of the negative power supply. To
maintain accuracy, the negative supply should be well regulated.
For applications where very high accuracy is required, a voltage
reference can be used to set IREF. An important consideration for
the squaring circuit is that a sufficiently large input voltage can
force the output beyond the operating range of the output op
amp. Resistor R4 can be changed to scale IREF, or R1 and R2 can
be varied to keep the output voltage within the usable range.
1
2
3
6
7
5
V+
2
3
8
1
4
6
5
7
IO
9
8
10
Q1
Q3
Q2
14
12
Q4
13
MAT04
C2
100pF
1/4
OP497
1/4
OP497
VOUT
R2
33k
IREF
IIN
C1
100pF
–15V
V–
R5
2k
R3
50k
R4
50k
VIN
R1
33k
0
03
09
-0
42
Figure 41. Square Root Amplifier
Unadjusted accuracy of the square root circuit is better than
0.1% over an input voltage range of 100 mV to 10 V. For a similar
input voltage range, the accuracy of the squaring circuit is better
than 0.5%.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
OP-497FS 制造商:AD 制造商全稱:Analog Devices 功能描述:PRECISION PICOAMPERE INPUT CURRENT QUAD OPERATIONAL AMPLIFIER
OP497FS-REEL 功能描述:IC OPAMP GP 500KHZ QUAD 16SOIC RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:Excalibur™ 放大器類型:J-FET 電路數(shù):1 輸出類型:- 轉(zhuǎn)換速率:45 V/µs 增益帶寬積:10MHz -3db帶寬:- 電流 - 輸入偏壓:20pA 電壓 - 輸入偏移:490µV 電流 - 電源:1.7mA 電流 - 輸出 / 通道:48mA 電壓 - 電源，單路/雙路(±):4.5 V ~ 38 V，±2.25 V ~ 19 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:8-SOIC 包裝:帶卷 (TR)
OP497FSZ 功能描述:IC OPAMP GP 500KHZ QUAD 16SOIC RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 放大器類型:通用 電路數(shù):4 輸出類型:- 轉(zhuǎn)換速率:0.6 V/µs 增益帶寬積:1MHz -3db帶寬:- 電流 - 輸入偏壓:45nA 電壓 - 輸入偏移:2000µV 電流 - 電源:1.4mA 電流 - 輸出 / 通道:40mA 電壓 - 電源，單路/雙路(±):3 V ~ 32 V，±1.5 V ~ 16 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:14-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:14-TSSOP 包裝:帶卷 (TR) 其它名稱:LM324ADTBR2G-NDLM324ADTBR2GOSTR
OP497FSZ 制造商:Analog Devices 功能描述:IC, OP-AMP, 500KHZ, 0.15V/ us, SOIC-16
OP497FSZ1 制造商:AD 制造商全稱:Analog Devices 功能描述:Precision Picoampere Input Current Quad Operational Amplifier
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