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參數(shù)資料
型號(hào)： ADA4528-1ARMZ
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 8/20頁(yè)
文件大?。?/td> 0K
描述： IC OP AMP RRIO ZERODRIFT 8MSOP
視頻文件： ADA4528: Lowest Noise, Zero-Drift Amplifier Enabling 24 bit Resolution
標(biāo)準(zhǔn)包裝： 50
放大器類型： 零漂移
電路數(shù)： 1
輸出類型： 滿擺幅
轉(zhuǎn)換速率： 0.5 V/µs
增益帶寬積： 4MHz
電流 - 輸入偏壓： 90pA
電壓 - 輸入偏移： 0.3µV
電流 - 電源： 1.5mA
電流 - 輸出 / 通道： 40mA
電壓 - 電源，單路/雙路(±)： 2.2 V ~ 5.5 V，±1.1 V ~ 2.75 V
工作溫度： -40°C ~ 125°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： 管件
ADA4528-1
Data Sheet
Rev. A | Page 16 of 20
The total equivalent rms noise over a specific bandwidth is
expressed as
eN,RMS = eN total √BW
where BW is the bandwidth in hertz.
This analysis is valid for broadband noise calculation. If the
bandwidth of concern includes the chopping frequency, more
complicated calculations must be made to include the effect of
the noise spike at the chopping frequency (see Figure 60).
With a low source resistance of RS < 1 kΩ, the voltage noise of
the amplifier dominates. As source resistance increases, the
thermal noise of RS dominates. As the source resistance further
increases, where RS > 100 kΩ, the current noise becomes the
main contributor of the total input noise. A good selection table
for low noise op amps can be found in the AN-940 Application
Note, Low Noise Amplifier Selection Guide for Optimal Noise
Performance.
Voltage Noise Density with Different Gain Configurations
Figure 58 shows the voltage noise density vs. closed-loop gain of
a zero-drift amplifier from Competitor A. The voltage noise density
of the amplifier increases from 11 nV/√Hz to 21 nV/√Hz as closed-
loop gain decreases from 1000 to 1. Figure 59 shows the voltage
noise density vs. frequency of the ADA4528-1 for three different
gain configurations. The ADA4528-1 offers lower input voltage
noise density of 6 nV/√Hz to 7 nV/√Hz regardless of gain
configurations.
24
20
16
12
8
4
0
1
10
100
1000
09
43
7-
0
61
VO
LT
AG
E
NO
IS
E
DE
NS
IT
Y
(
n
V
/√
Hz
)
CLOSED-LOOP GAIN (V/V)
VSY = 5V
f = 100Hz
COMPETITOR A
Figure 58. Competitor A: Voltage Noise Density vs. Closed-Loop Gain
1
10
100
1
10
100
1k
10k
VOL
TA
G
E
N
O
IS
E
D
E
N
S
IT
Y
(n
V/
√Hz
)
FREQUENCY (Hz)
AV = 10
AV = 100
AV = 1
VSY = 5V
VCM = VSY/2
0
943
7-
06
2
Figure 59. Voltage Noise Density vs. Frequency
Residual Ripple
Although the ACFB suppresses the chopping related ripples,
there exists higher noise spectrum at the chopping frequency
and its harmonics due to the remaining ripples. Figure 60 shows
the voltage noise density of the ADA4528-1 configured in unity
gain. A noise spike of 50 nV/√Hz can be seen at the chopping
frequency of 200 kHz. This noise spike is significant when the
op amp has a closed-loop frequency that is higher than the
chopping frequency. To further suppress the noise to a desired
level, it is recommended to have a post filter at the output of the
amplifier.
1
10
100
1
10
100
1k
10k
100k
1M
10M
VO
LT
AG
E
NO
IS
E
DE
NS
IT
Y
(
n
V
/√
Hz
)
FREQUENCY (Hz)
09
43
7-
0
63
VSY = 5V
VCM = VSY/2
AV = 1
Figure 60. Voltage Noise Density
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