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| 型號： | OP37GSZ-REEL |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 4/16頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC OPAMP GP 63MHZ LN PREC 8SOIC |
| 標準包裝： | 2,500 |
| 放大器類型： | 通用 |
| 電路數(shù)： | 1 |
| 轉(zhuǎn)換速率： | 17 V/µs |
| 增益帶寬積： | 63MHz |
| 電流 - 輸入偏壓： | 15nA |
| 電壓 - 輸入偏移： | 30µV |
| 電壓 - 電源，單路/雙路(±)： | ±4 V ~ 18 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） |
| 供應商設(shè)備封裝： | 8-SO |
| 包裝： | 帶卷 (TR) |
REV. B
OP37
–12–
FREQUENCY – Hz
140
10
CMRR
–
dB
100
1k
10k
100k
1M
120
100
80
60
40
TA = 25 C
VS = 15V
VCM = 20V p-p
AC TRIM @ 10kHz
RS = 0
RS = 100 ,
1k
UNBALANCED
RS = 1k
BALANCED
RS = 0
Figure 4b. CMRR vs. Frequency
Comments on Noise
The OP37 is a very low-noise monolithic op amp. The outstanding
input voltage noise characteristics of the OP37 are achieved
mainly by operating the input stage at a high quiescent current.
The input bias and offset currents, which would normally increase,
are held to reasonable values by the input bias current cancellation
circuit. The OP37A/E has IB and IOS of only
±40 nA and 35 nA
respectively at 25
∞C. This is particularly important when the input
has a high source resistance. In addition, many audio amplifier
designers prefer to use direct coupling. The high IB. TCVOS of
previous designs have made direct coupling difficult, if not
impossible, to use.
RS – SOURCE RESISTANCE –
10
50
10k
TOT
A
L
N
OISE
–
nV/
Hz
5
500
1k
5k
1
100
50
100
50k
RS1
RS2
1 RS UNMATCHED
e.g. RS = RS1 = 10k , RS2 = 0
2 RS MATCHED
e.g. RS = 10k , RS1 = RS2 = 5k
OP07
5534
OP27/37
REGISTER
NOISE ONLY
OP08/108
1
2
Figure 5. Noise vs. Resistance (Including Resistor Noise
@ 1000 Hz)
Voltage noise is inversely proportional to the square-root of bias
current, but current noise is proportional to the square-root of
bias current. The OP37’s noise advantage disappears when high
source-resistors are used. Figures 5, 6, and 7 compare OP-37
observed total noise with the noise performance of other devices
in different circuit applications.
Total noise = [( Voltage noise)2 + (current noise
RS)2 +
(resistor noise_]1/2
Figure 5 shows noise versus source resistance at 1000 Hz. The
same plot applies to wideband noise. To use this plot, just multiply
the vertical scale by the square-root of the bandwidth.
RS – SOURCE RESISTANCE –
100
50
10k
p-p
NOISE
–
nV
50
500
1k
5k
10
1k
500
100
50k
RS1
RS2
1 RS UNMATCHED
e.g. RS = RS1 = 10k , RS2 = 0
2 RS MATCHED
e.g. RS = 10k , R S1 = RS2 = 5k
OP07
5534
OP27/37
REGISTER
NOISE ONLY
OP08/108
1
2
Figure 6. Peak-to-Peak Noise (0.1 Hz to 10 Hz) vs. Source
Resistance (Includes Resistor Noise)
At RS < 1 k
W key the OP37’s low voltage noise is maintained.
With RS < 1 k
W, total noise increases, but is dominated by the
resistor noise rather than current or voltage noise. It is only
beyond Rs of 20 k
W that current noise starts to dominate. The
argument can be made that current noise is not important for
applications with low to-moderate source resistances. The
crossover between the OP37 and OP07 and OP08 noise occurs
in the 15 k
W to 40 kW region.
RS – SOURCE RESISTANCE –
10
50
10k
TOT
A
L
N
OISE
–
nV/
Hz
5
500
1k
5k
1
100
50
100
50k
OP07
5534
OP27/37
REGISTER
NOISE ONLY
OP08/108
RS1
RS2
1 RS UNMATCHED
e.g. RS = RS1 = 10k , RS2 = 0
2 RS MATCHED
e.g. RS = 10k , RS1 = RS2 = 5k
1
2
Figure 7. Noise vs. Source resistance (Includes Resistor
Noise @ 10 Hz)
Figure 6 shows the 0.1 Hz to 10 Hz peak-to-peak noise. Here
the picture is less favorable; resistor noise is negligible, current
noise becomes important because it is inversely proportional to
the square-root of frequency. The crossover with the OP07
occurs in the 3 k
W to 5 kW range depending on whether bal-
anced or unbalanced source resistors are used (at 3 k
W the IB.
IOS error also can be three times the VOS spec.).
Therefore, for low-frequency applications, the OP07 is better
than the OP27/37 when Rs > 3 k
W. The only exception is when
gain error is important. Figure 7 illustrates the 10 Hz noise. As
expected, the results are between the previous two figures.
For reference, typical source resistances of some signal sources
are listed in Table I.
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| OP37GSZ-REEL7 | 功能描述:IC OPAMP GP 63MHZ LN PREC 8SOIC RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:2,500 系列:- 放大器類型:通用 電路數(shù):1 輸出類型:滿擺幅 轉(zhuǎn)換速率:0.11 V/µs 增益帶寬積:350kHz -3db帶寬:- 電流 - 輸入偏壓:4nA 電壓 - 輸入偏移:20µV 電流 - 電源:260µA 電流 - 輸出 / 通道:20mA 電壓 - 電源，單路/雙路(±):2.7 V ~ 36 V，±1.35 V ~ 18 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） 供應商設(shè)備封裝:8-SO 包裝:帶卷 (TR) |
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