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鍨嬭櫉(h脿o)锛� ADA4528-1ACPZ-RL
寤�(ch菐ng)鍟嗭細 Analog Devices Inc
鏂囦欢闋�(y猫)鏁�(sh霉)锛� 8/20闋�(y猫)
鏂囦欢澶�?銆�?/td> 0K
鎻忚堪锛� IC OPAMP GP RRIO 4MHZ ZD 8LFCSP
瑕栭牷鏂囦欢锛� ADA4528: Lowest Noise, Zero-Drift Amplifier Enabling 24 bit Resolution
妯�(bi膩o)婧�(zh菙n)鍖呰锛� 5,000
鏀惧ぇ鍣ㄩ(l猫i)鍨嬶細 闆舵紓绉�
闆昏矾鏁�(sh霉)锛� 1
杓稿嚭椤�(l猫i)鍨嬶細 婊�(m菐n)鎿哄箙
杞�(zhu菐n)鎻涢€熺巼锛� 0.5 V/µs
澧炵泭甯跺绌嶏細 4MHz
闆绘祦 - 杓稿叆鍋忓锛� 90pA
闆诲 - 杓稿叆鍋忕Щ锛� 0.3µV
闆绘祦 - 闆绘簮锛� 1.5mA
闆绘祦 - 杓稿嚭 / 閫氶亾锛� 40mA
闆诲 - 闆绘簮锛屽柈璺�/闆欒矾(±)锛� 2.2 V ~ 5.5 V锛�±1.1 V ~ 2.75 V
宸ヤ綔婧害锛� -40°C ~ 125°C
瀹夎椤�(l猫i)鍨嬶細 琛ㄩ潰璨艰
灏佽/澶栨锛� 8-WFDFN 瑁搁湶鐒婄洡(p谩n)锛孋SP
渚涙噳(y墨ng)鍟嗚ō(sh猫)鍌欏皝瑁濓細 8-LFCSP-WD锛�3x3锛�
鍖呰锛� 甯跺嵎 (TR)
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 鈭欱W
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 k惟, 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 k惟, 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/鈭欻z to 21 nV/鈭欻z 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/鈭欻z to 7 nV/鈭欻z 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
/鈭�
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/
鈭欻z
)
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/鈭欻z 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
/鈭�
Hz
)
FREQUENCY (Hz)
09
43
7-
0
63
VSY = 5V
VCM = VSY/2
AV = 1
Figure 60. Voltage Noise Density
鐩搁棞(gu膩n)PDF璩囨枡
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鐩搁棞(gu膩n)浠ｇ悊鍟�/鎶€琛�(sh霉)鍙冩暩(sh霉)
鍙冩暩(sh霉)鎻忚堪
ADA4528-1ARMZ 鍔熻兘鎻忚堪:IC OP AMP RRIO ZERODRIFT 8MSOP RoHS:鏄� 椤�(l猫i)鍒�:闆嗘垚闆昏矾 (IC) >> Linear - Amplifiers - Instrumentation 绯诲垪:- 妯�(bi膩o)婧�(zh菙n)鍖呰:1 绯诲垪:- 鏀惧ぇ鍣ㄩ(l猫i)鍨�:閫氱敤 闆昏矾鏁�(sh霉):4 杓稿嚭椤�(l猫i)鍨�:婊�(m菐n)鎿哄箙 杞�(zhu菐n)鎻涢€熺巼:0.028 V/µs 澧炵泭甯跺绌�:105kHz -3db甯跺:- 闆绘祦 - 杓稿叆鍋忓:3nA 闆诲 - 杓稿叆鍋忕Щ:100µV 闆绘祦 - 闆绘簮:3.3µA 闆绘祦 - 杓稿嚭 / 閫氶亾:12mA 闆诲 - 闆绘簮锛屽柈璺�/闆欒矾(±):2.7 V ~ 12 V锛�±1.35 V ~ 6 V 宸ヤ綔婧害:-40°C ~ 85°C 瀹夎椤�(l猫i)鍨�:琛ㄩ潰璨艰 灏佽/澶栨:14-TSSOP锛�0.173"锛�4.40mm 瀵級 渚涙噳(y墨ng)鍟嗚ō(sh猫)鍌欏皝瑁�:14-TSSOP 鍖呰:鍓垏甯� (CT) 鍏跺畠鍚嶇ū(ch膿ng):OP481GRUZ-REELCT
ADA4528-1ARMZ_PROMO 鍒堕€犲晢:Analog Devices 鍔熻兘鎻忚堪:IC OP AMP RRIO ZERODRIFT M
ADA4528-1ARMZ-R7 鍔熻兘鎻忚堪:IC OP AMP RRIO ZERODRIFT 8MSOP RoHS:鏄� 椤�(l猫i)鍒�:闆嗘垚闆昏矾 (IC) >> Linear - Amplifiers - Instrumentation 绯诲垪:- 妯�(bi膩o)婧�(zh菙n)鍖呰:1,000 绯诲垪:- 鏀惧ぇ鍣ㄩ(l猫i)鍨�:闆诲鍙嶉 闆昏矾鏁�(sh霉):4 杓稿嚭椤�(l猫i)鍨�:婊�(m菐n)鎿哄箙 杞�(zhu菐n)鎻涢€熺巼:33 V/µs 澧炵泭甯跺绌�:20MHz -3db甯跺:30MHz 闆绘祦 - 杓稿叆鍋忓:2nA 闆诲 - 杓稿叆鍋忕Щ:3000µV 闆绘祦 - 闆绘簮:2.5mA 闆绘祦 - 杓稿嚭 / 閫氶亾:30mA 闆诲 - 闆绘簮锛屽柈璺�/闆欒矾(±):4.5 V ~ 16.5 V锛�±2.25 V ~ 8.25 V 宸ヤ綔婧害:-40°C ~ 85°C 瀹夎椤�(l猫i)鍨�:琛ㄩ潰璨艰 灏佽/澶栨:14-SOIC锛�0.154"锛�3.90mm 瀵級 渚涙噳(y墨ng)鍟嗚ō(sh猫)鍌欏皝瑁�:14-SOIC 鍖呰:甯跺嵎 (TR)
ADA4528-1ARMZ-RL 鍔熻兘鎻忚堪:IC OP AMP RRIO ZERODRIFT 8MSOP RoHS:鏄� 椤�(l猫i)鍒�:闆嗘垚闆昏矾 (IC) >> Linear - Amplifiers - Instrumentation 绯诲垪:- 妯�(bi膩o)婧�(zh菙n)鍖呰:2,500 绯诲垪:- 鏀惧ぇ鍣ㄩ(l猫i)鍨�:閫氱敤 闆昏矾鏁�(sh霉):1 杓稿嚭椤�(l猫i)鍨�:婊�(m菐n)鎿哄箙 杞�(zhu菐n)鎻涢€熺巼:0.11 V/µs 澧炵泭甯跺绌�:350kHz -3db甯跺:- 闆绘祦 - 杓稿叆鍋忓:4nA 闆诲 - 杓稿叆鍋忕Щ:20µV 闆绘祦 - 闆绘簮:260µA 闆绘祦 - 杓稿嚭 / 閫氶亾:20mA 闆诲 - 闆绘簮锛屽柈璺�/闆欒矾(±):2.7 V ~ 36 V锛�±1.35 V ~ 18 V 宸ヤ綔婧害:-40°C ~ 85°C 瀹夎椤�(l猫i)鍨�:琛ㄩ潰璨艰 灏佽/澶栨:8-SOIC锛�0.154"锛�3.90mm 瀵級 渚涙噳(y墨ng)鍟嗚ō(sh猫)鍌欏皝瑁�:8-SO 鍖呰:甯跺嵎 (TR)
ADA4528-2ACPZ-R7 鍒堕€犲晢:Analog Devices 鍔熻兘鎻忚堪:SP Amp Zero Drift Amplifier Dual R-R I/O 卤2.75V/5.5V 8-Pin LFCSP EP T/R 鍒堕€犲晢:Analog Devices 鍔熻兘鎻忚堪:LOW NOISE RRIO ZERO DRIFT DUAL OPAMP - Tape and Reel 鍒堕€犲晢:Analog Devices Inc. 鍔熻兘鎻忚堪:Precision Amplifiers Low Noise RRIO Zero Drift Dual OpAmp
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