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参数资料
| 型号： | LT1677CS8 |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 运动控制电子 |
| 英文描述： | Low Noise, Rail-to-Rail Precision Op Amp |
| 中文描述： | OP-AMP, 120 uV OFFSET-MAX, 6.2 MHz BAND WIDTH, PDSO8 |
| 封装： | 0.150 INCH, PLASTIC, SOP-8 |
| 文件页数： | 11/16页 |
| 文件大小： | 239K |
| 代理商： | LT1677CS8 |
11
LT1677
Current noise is measured in the circuit shown in Figure 7
and calculated by the following formula:
i
e
nV
)(
M
1
n
no
=
(
)
(
)
(
)
2
21 2
130
101
101
The LT1677 achieves its low noise, in part, by operating
the input stage at 120
μ
A versus the typical 10
μ
A of most
other op amps. Voltage noise is inversely proportional
while current noise is directly proportional to the square
root of the input stage current. Therefore, the LT1677’s
current noise will be relatively high. At low frequencies, the
low 1/f current noise corner frequency (
≈
90Hz) mini-
mizes current noise to some extent.
In most practical applications, however, current noise will
not limit system performance. This is illustrated in the
Total Noise vs Source Resistance plot (Figure 8) where:
Total Noise = [(voltage noise)
2
+ (current noise R
S
)
2
+
(resistor noise)
2
]
1/2
Three regions can be identified as a function of source
resistance:
(i) R
S
≤
400
. Voltage noise dominates
(ii) 400
≤
R
S
≤
50k at 1kHz
400
≤
R
S
≤
8k at 10Hz
Figure 6a. 0.1Hz to 10Hz Noise Test Circuit
Figure 6b. 0.1Hz to 10Hz Peak-to-Peak
Noise Tester Frequency Response
1677 F06a
10
0.1
μ
F
4.7
μ
F
VOLTAGE GAIN
= 50,000
24.3k
100k
–
+
–
+
*
LT1677
LT1001
2k
4.3k
110k
100k
SCOPE
×
1
R
IN
= 1M
*DEVICE UNDER TEST
NOTE: ALL CAPACITOR VALUES ARE FOR
NONPOLARIZED CAPACITORS ONLY
2.2
μ
F
0.1
μ
F
22
μ
F
FREQUENCY (Hz)
100
90
80
70
60
50
40
30
0.01
1
10
100
1677 F06b
0.1
G
APPLICATIOU
W
U
U
Figure 7
1677 F07
100
100k
–
+
LT1677
500k
500k
e
no
SOURCE RESISTANCE (k
)
0.1
1
10
100
1000
1
10
100
1677 F08
T
√
H
V
S
=
±
15V
T
A
= 25
°
C
SOURCE RESISTANCE = 2R
R
R
AT 1kHz
AT 10Hz
RESISTOR
NOISE ONLY
Figure 8. Total Noise vs Source Resistance
(iii) R
S
> 50k at 1kHz
R
S
> 8k at 10Hz
Clearly the LT1677 should not be used in region (iii), where
total system noise is at least six times higher than the
}
Resistor noise
dominates
}
Current noise
dominates
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|---|---|
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1677CS8#PBF | 功能描述:IC OPAMP R-R IN/OUT SNGL 8-SOIC RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:2,500 系列:- 放大器类型:通用 电路数:4 输出类型:- 转换速率:0.6 V/µs 增益带宽积:1MHz -3db带宽:- 电流 - 输入偏压:45nA 电压 - 输入偏移:2000µV 电流 - 电源:1.4mA 电流 - 输出 / 通道:40mA 电压 - 电源，单路/双路(±):3 V ~ 32 V，±1.5 V ~ 16 V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:14-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:14-TSSOP 包装:带卷 (TR) 其它名称:LM324ADTBR2G-NDLM324ADTBR2GOSTR |
| LT1677CS8#TR | 功能描述:IC OPAMP R-R I/O SGL LN 8SOIC RoHS:否 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:50 系列:LinCMOS™ 放大器类型:通用 电路数:4 输出类型:- 转换速率:0.05 V/µs 增益带宽积:110kHz -3db带宽:- 电流 - 输入偏压:0.7pA 电压 - 输入偏移:210µV 电流 - 电源:57µA 电流 - 输出 / 通道:30mA 电压 - 电源，单路/双路(±):3 V ~ 16 V，±1.5 V ~ 8 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:14-SOIC（0.154"，3.90mm 宽） 供应商设备封装:14-SOIC 包装:管件 产品目录页面:865 (CN2011-ZH PDF) 其它名称:296-1834296-1834-5 |
| LT1677CS8#TRPBF | 功能描述:IC OPAMP R-R IN/OUT SNGL 8-SOIC RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:50 系列:LinCMOS™ 放大器类型:通用 电路数:4 输出类型:- 转换速率:0.05 V/µs 增益带宽积:110kHz -3db带宽:- 电流 - 输入偏压:0.7pA 电压 - 输入偏移:210µV 电流 - 电源:57µA 电流 - 输出 / 通道:30mA 电压 - 电源，单路/双路(±):3 V ~ 16 V，±1.5 V ~ 8 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:14-SOIC（0.154"，3.90mm 宽） 供应商设备封装:14-SOIC 包装:管件 产品目录页面:865 (CN2011-ZH PDF) 其它名称:296-1834296-1834-5 |
| LT1677CS8PBF | 制造商:Linear Technology 功能描述:Op Amp Precision RRI/O Low Noise SOIC8 |
| LT1677I | 制造商:LINER 制造商全称:Linear Technology 功能描述:Low Noise, Rail-to-Rail Precision Op Amp |
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