參數(shù)資料
型號(hào)： LT1678IS8
廠商： LINEAR TECHNOLOGY CORP
元件分類： 運(yùn)動(dòng)控制電子
英文描述： Dual/Quad Low Noise, Rail-to-Rail, Precision Op Amps
中文描述： DUAL OP-AMP, 420 uV OFFSET-MAX, 19 MHz BAND WIDTH, PDSO8
封裝： 0.150 INCH, PLASTIC, SO-8
文件頁(yè)數(shù)： 12/16頁(yè)
文件大小： 297K
代理商： LT1678IS8
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
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LT1678IS8#PBF 功能描述:IC OPAMP R-R I/O DUAL LN 8SOIC 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
LT1678IS8#TR 功能描述:IC OPAMP R-R I/O DUAL LN 8SOIC RoHS:否 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):2 輸出類型:滿擺幅 轉(zhuǎn)換速率:350 V/µs 增益帶寬積:180MHz -3db帶寬:320MHz 電流 - 輸入偏壓:12.5µA 電壓 - 輸入偏移:800µV 電流 - 電源:15mA 電流 - 輸出 / 通道:85mA 電壓 - 電源，單路/雙路(±):2.5 V ~ 12.6 V，±1.25 V ~ 6.3 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP，8-MSOP（0.118"，3.00mm 寬） 供應(yīng)商設(shè)備封裝:8-MSOP 包裝:帶卷 (TR)
LT1678IS8#TRPBF 功能描述:IC OPAMP R-R I/O DUAL LN 8SOIC 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):2 輸出類型:滿擺幅 轉(zhuǎn)換速率:350 V/µs 增益帶寬積:180MHz -3db帶寬:320MHz 電流 - 輸入偏壓:12.5µA 電壓 - 輸入偏移:800µV 電流 - 電源:15mA 電流 - 輸出 / 通道:85mA 電壓 - 電源，單路/雙路(±):2.5 V ~ 12.6 V，±1.25 V ~ 6.3 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP，8-MSOP（0.118"，3.00mm 寬） 供應(yīng)商設(shè)備封裝:8-MSOP 包裝:帶卷 (TR)
LT1678IS8PBF 制造商:Linear Technology 功能描述:Op Amp Dual Prec. RRI/O Low Noise SOIC8
LT1679 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual/Quad Low Noise, Rail-to-Rail, Precision Op Amps
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