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参数资料
| 型号： | LT1679 |
| 厂商： | Linear Technology Corporation |
| 英文描述： | Dual/Quad Low Noise, Rail-to-Rail, Precision Op Amps |
| 中文描述： | 双/四低噪声，轨至轨，精密运算放大器 |
| 文件页数： | 12/16页 |
| 文件大小： | 297K |
| 代理商： | LT1679 |
LT1678/LT1679
12
sn16789 16789fs
3. Sudden motion in the vicinity of the device can also
“feedthrough” to increase the observed noise.
Current noise is measured in the circuit shown in Figure 5
and calculated by the following formula:
i
e
nV
M
1
n
no
=
(
)
(
)
(
)(
)
2
21 2
130
101
101
The
LT1678/LT1679
achieve their low noise, in part, by
operating the input stage at 100
μ
A versus the typical 10
μ
A
of most other op amps. Voltage noise is inversely propor-
tional while current noise is directly proportional to the
square root of the input stage current. Therefore, the
LT1678/LT1679
’s current noise will be relatively high. At
low frequencies, the low 1/f current noise corner fre-
quency (
≈
200Hz) minimizes 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 6) where:
APPLICATIOU
W
U
U
16789
F03
10
0.1
μ
F
4.7
μ
F
VOLTAGE GAIN
= 50,000
24.3k
100k
–
+
–
+
*
LT1678
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
16789
F04
0.1
G
16789
F05
100
100k
–
+
LT1678
500k
500k
e
no
Figure 3. 0.1Hz to 10Hz Noise Test Circuit
Figure 4. 0.1Hz to 10Hz Peak-to-Peak
Noise Tester Frequency Response
Figure 5.
Total Noise = [(op amp voltage noise)
2
+ (resistor noise)
2
+ (current noise R
S
)
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
(iii) R
S
> 50k at 1kHz
R
S
> 8k at 10Hz
Resistor Noise
Dominates
Current Noise
Dominates
Clearly the
LT1678/LT1679
should not be used in region
(iii), where total system noise is at least six times higher
than the voltage noise of the op amp, i.e., the low voltage
noise specification is completely wasted. In this region the
LT1113 or LT1169 are better choices.
1000
R
SOURCE RESISTANCE (k
)
0.1
1
10
100
1
10
100
16789
F06
T
√
H
V
S
=
±
15V
T
A
= 25
°
C
SOURCE RESISTANCE = 2R
R
AT 1kHz
AT 10Hz
RESISTOR
NOISE ONLY
Figure 6. Total Noise vs Source Resistance
相关PDF资料 |
PDF描述 |
|---|---|
| LT1679CS | Dual/Quad Low Noise, Rail-to-Rail, Precision Op Amps |
| LT1680C | High Power DC/DC Step-Up Controller |
| LT1680CN | High Power DC/DC Step-Up Controller |
| LT1680CSW | High Power DC/DC Step-Up Controller |
| LT1680I | High Power DC/DC Step-Up Controller |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1679CS | 功能描述:IC OPAMP R-R I/O QUAD LN 14SOIC RoHS:否 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:50 系列:- 放大器类型:J-FET 电路数:2 输出类型:- 转换速率:13 V/µs 增益带宽积:3MHz -3db带宽:- 电流 - 输入偏压:65pA 电压 - 输入偏移:3000µV 电流 - 电源:1.4mA 电流 - 输出 / 通道:- 电压 - 电源，单路/双路(±):7 V ~ 36 V，±3.5 V ~ 18 V 工作温度:-40°C ~ 85°C 安装类型:通孔 封装/外壳:8-DIP（0.300"，7.62mm） 供应商设备封装:8-PDIP 包装:管件 |
| LT1679CS#PBF | 功能描述:IC OP AMP RRIO QUAD LN 14-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 |
| LT1679CS#TR | 功能描述:IC OPAMP R-R I/O QUAD LN 14SOIC RoHS:否 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:50 系列:- 放大器类型:J-FET 电路数:2 输出类型:- 转换速率:13 V/µs 增益带宽积:3MHz -3db带宽:- 电流 - 输入偏压:65pA 电压 - 输入偏移:3000µV 电流 - 电源:1.4mA 电流 - 输出 / 通道:- 电压 - 电源，单路/双路(±):7 V ~ 36 V，±3.5 V ~ 18 V 工作温度:-40°C ~ 85°C 安装类型:通孔 封装/外壳:8-DIP（0.300"，7.62mm） 供应商设备封装:8-PDIP 包装:管件 |
| LT1679CS#TRPBF | 功能描述:IC OPAMP R-R I/O QUAD LN 14SOIC RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:50 系列:- 放大器类型:J-FET 电路数:2 输出类型:- 转换速率:13 V/µs 增益带宽积:3MHz -3db带宽:- 电流 - 输入偏压:65pA 电压 - 输入偏移:3000µV 电流 - 电源:1.4mA 电流 - 输出 / 通道:- 电压 - 电源，单路/双路(±):7 V ~ 36 V，±3.5 V ~ 18 V 工作温度:-40°C ~ 85°C 安装类型:通孔 封装/外壳:8-DIP（0.300"，7.62mm） 供应商设备封装:8-PDIP 包装:管件 |
| LT1679CSPBF | 制造商:Linear Technology 功能描述:LT1679 quad precision LN SOIC op amp |
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