聚洵低功耗运算放大器GS8591 8592 8594

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GS8591/GS8592/GS8594放大器是单/双/四电源,微功耗,零漂移CMOS运算放大器,这些放大器提供4.5MHz的带宽,轨至轨输入和输出以及1.8V至5.5V的单电源供电。

GS859X使用斩波稳定技术来提供非常低的失调电压(最大值小于50µV),并且在整个温度范围内漂移接近零。

每个放大器550µA的低静态电源电流和20pA的极低输入偏置电流使这些器件成为低失调,低功耗和高阻抗应用的理想选择。

GS859X提供了出色的CMRR,而没有与传统的互补输入级相关的分频器。

这种设计在驱动模数转换器(ADC)方面具有卓越的性能,而不会降低差分线性度。

GS8591提供SOT23-5和SOP-8封装。

GS8592提供MSOP-8和SOP-8封装。

GS8594 Quad具有绿色SOP-14和TSSOP-14封装。

在所有电源电压下,-45oC 至+ 125oC的扩展温度范围提供了额外的设计灵活性。

特性:
+ 1.8V〜+ 5.5V单电源供电•嵌入式RF抗EMI滤波器
•轨到轨输入/输出•小型封装:
•增益带宽乘积:4.5MHz(典型@ 25°C)GS8591采用SOT23-5和SOP-8封装•低输入偏置电流:20pA(典型值@ 25°C)GS8592采用MSOP-8和SOP-8封装
•低失调电压:30µV(最大@ 25°C)GS8594采用SOP-14和TSSOP-14封装•静态电流:每个放大器550µA(典型值)
•工作温度:-45°C〜+ 125°C
•零漂移:0.03µV / oC(典型值)
Features
•Single-Supply Operation from +1.8V ~ +5.5V •Embedded RF Anti-EMI Filter
•Rail-to-Rail Input / Output •Small Package:
•Gain-Bandwidth Product: 4.5MHz (Typ. @25°C) GS8591 Available in SOT23-5 and SOP-8 Packages
•Low Input Bias Current: 20pA (Typ. @25°C) GS8592 Available in MSOP-8 and SOP-8 Packages
•Low Offset Voltage: 30µV (Max. @25°C) GS8594 Available in SOP-14 and TSSOP-14 Packages •Quiescent Current: 550µA per Amplifier (Typ.)
•Operating Temperature: -45°C ~ +125°C
•Zero Drift: 0.03µV/o C (Typ.)
General Description
The GS859X amplifier is single/dual/quad supply, micro-power, zero-drift CMOS operational amplifiers, the amplifiers offer bandwidth of 4.5MHz, rail-to-rail inputs and outputs, and single-supply operation from 1.8V to 5.5V. GS859X uses chopper stabilized technique to provide very low offset voltage (less than 50µV maximum) and near zero drift over temperature. Low quiescent supply current of 550µA per amplifier and very low input bias current of 20pA make the devices an ideal choice for low offset, low power consumption and high impedance applications. The GS859X offers excellent CMRR without the crossover associated with traditional complementary input stages. This design results in superior performance for driving analog-to-digital converters (ADCs) without degradation of differential linearity.
The GS8591 is available in SOT23-5 and SOP-8 packages. And the GS8592 is available in MSOP-8 and SOP-8 packages. The
GS8594 Quad is available in Green SOP-14 and TSSOP-14 packages. The extended temperature range of -45o C to +125o C over all supply voltages offers additional design flexibility.
Applications
•Transducer Application •Handheld Test Equipment
•Temperature Measurements •Battery-Powered Instrumentation
•Electronics Scales
Pin Configuration
Figure 1. Pin Assignment Diagram
Absolute Maximum Ratings
Condition Min Max Power Supply Voltage (V DD to Vss) -0.5V +7.5V Analog Input Voltage (IN+ or IN-) Vss-0.5V V DD+0.5V PDB Input Voltage Vss-0.5V +7V Operating Temperature Range -45°C +125°C Junction Temperature +160°C
Storage Temperature Range -55°C +150°C Lead Temperature (soldering, 10sec) +260°C
Package Thermal Resistance (T A=+25 )
SOP-8, θJA 125°C/W
MSOP-8, θJA 216°C/W
SOT23-5, θJA 190°C/W
ESD Susceptibility
HBM 6KV
MM 400V
Note: Stress greater than those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions outside those indicated in the operational sections of this specification are not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability.
Package/Ordering Information
MODEL CHANNEL ORDER NUMBER
PACKAGE
DESCRIPTION
PACKAGE
OPTION
MARKING
INFORMATION
GS8591 Single
GS8591-TR SOT23-5 Tape and Reel,3000 8591 GS8591Y-SR SOP-8 Tape and Reel,4000 GS8591Y
GS8592 Dual G S8592-SR SOP-8 Tape and Reel,4000 GS8592 GS8592-MR MSOP-8 Tape and Reel,3000 GS8592
GS8594 Quad GS8594-TR TSSOP-14 Tape and Reel,3000 GS8594 GS8594-SR SOP-14 Tape and Reel,2500 GS8594
Electrical Characteristics
(V S = +5V, V CM = +2.5V, V O = +2.5V, T A = +25 , unless otherwise noted.)
PARAMETER CONDITIONS MIN TYP MAX UNITS INPUT CHARACTERISTICS
Input Offset Voltage (V OS) 1 5 µV Input Bias Current (I B) 20 pA Input Offset Current (I OS) 10 pA Common-Mode Rejection Ratio
(CMRR)
V CM = 0V to 5V 110 dB Large Signal Voltage Gain ( A VO) R L = 10kΩ, V O = 0.3V to 4.7V 145 dB Input Offset Voltage Drift (∆V OS/∆T) 30 nV/ OUTPUT CHARACTERISTICS
Output Voltage High (V OH) R L = 100kΩ to - V S 4.998 V R L = 10kΩ to - V S 4.994 V
Output Voltage Low (V OL) R L = 100kΩ to + V S 2 mV R L = 10kΩ to + V S 5 mV
Short Circuit Limit (I SC) R L =10Ω to - V S 43 mA Output Current (I O) 30 mA POWER SUPPLY
Power Supply Rejection Ratio (PSRR) V S = 2.5V to 5.5V 115 dB Quiescent Current (I Q) V O = 0V, R L = 0Ω 180 µA DYNAMIC PERFORMANCE
Gain-Bandwidth Product (GBP) G = +100 4.5 MHz Slew Rate (SR) R L = 10kΩ 2.5 V/µs Overload Recovery Time 0.10 ms NOISE PERFORMANCE
Voltage Noise (e n p-p) 0Hz to 10Hz 0.2 µV P-P
nV Voltage Noise Density (e n) f = 1kHz 30 Hz
Typical Performance characteristics
Large Signal Transient Response at +5V Large Signal Transient Response at +2.5V
C L=300pF R L=2kΩA V=+1
C L=300pF
R L=2kΩ
A V=+1
Time(4µs/div) Time(2µs/div)
Small Signal Transient Response at +5V Small Signal Transient Response at +2.5V
C L=50pF R L=∞
A V=+1
C L=50pF
R L=∞
A V=+1
Time(4µs/div) Time(4µs/div)
Closed Loop Gain vs. Frequency at +5V Closed Loop Gain vs. Frequency at +2.5V G=-100 G=-100 G=-10 G=-10
G=+1 G=+1
Frequency (kHz) Frequency (kHz)
Typical Performance characteristics
Open Loop Gain, Phase Shift vs. Frequency at +5V Open Loop Gain, Phase Shift vs. Frequency at +2.5V
Phase Shift
V L=0pF
R L=∞V L=0pF
R L=∞
Phase Shift
Open Loop Gain
Open Loop Gain Frequency (Hz) Frequency (Hz) Positive Overvoltage Recovery Negative Overvoltage Recovery
V SY= 2.5V
V IN=-200mVp-p
(RET to GND)
C L=0pF
R L=10kΩA V=-100 V SY= 2.5V
V IN=-200mVp-p
(RET to GND) C L=0pF
R L=10kΩ
A V=-100
Time (40µs/div) Time (40µs/div) 0.1Hz to 10Hz Noise at +5V 0.1Hz to 10Hz Noise at +2.5V
G=10000
G=10000 Time (10s/div) Time (10s/div)
Application Note
Size
GS859X系列运算放大器具有单位增益稳定的特性,适用于各种通用应用。

GS859X系列封装的占地面积小,可以节省印
刷电路板上的空间,并可以设计更小的电子产品。

Power Supply Bypassing and Board Layout
GS859X系列采用1.8V至5.5V单电源或±0.9V至±2.75V双电源供电。

为了获得最佳性能,在单电源供电模式下,应将
一个0.1pF的陶瓷电容器靠近VDD引脚放置。

对于双电源供电,应使用单独的0.1pF陶瓷电容器将VDD和VSS电源均旁路到地。

Low Supply Current
GS859X系列的低电源电流(每个通道通常为550uA)将有助于最大程度地延长电池寿命。

它们是电池供电系统的理想选择Operating Voltage
GS859X系列在宽输入电源电压(1.8V至5.5V)下工作。

此外,所有温度规格适用于从40 oC到+125 oC的温度范围。

在整个工作电压范围内,大多数行为保持不变。

这些保证确保了整个锂离子电池的整个使用寿命
Rail-to-Rail Input
GS859X系列的输入共模范围超出了电源轨(VSS-0.1V至VDD + 0.1V)100mV。

这是通过使用互补输入级来实现的。

对于
正常操作,输入应限制在此范围内。

Rail-to-Rail Output
轨到轨输出摆幅可在输出端提供最大可能的动态范围。

在低电源电压下运行时,这一点尤其重要。

GS859X系列的输出电压
在轻阻负载(>100kΩ)时通常可从供电轨摆动至小于5mV,而在中等阻性负载(10kΩ)时可降至60mV。

Capacitive Load Tolerance
GS859x系列针对带宽和速度进行了优化,而不是用于驱动电容性负载。

输出电容将在放大器的反馈路径中形成一个极点,从
而导致过度的峰值和电势振荡。

如果需要使用负载电容,则要考虑的两种策略是(1)使用与放大器输出和负载电容串联的小
电阻,以及(2)通过增加放大器的反馈环路来减小放大器反馈环路的带宽。

总体噪声增益。

图2.显示了采用串联电阻器策略
的单位增益跟随器。

电阻将输出与电容隔离,更重要的是,在反馈路径中产生一个零,以补偿由输出电容产生的极点。

Figure 2. Indirectly Driving a Capacitive Load Using Isolation Resistor
RISO电阻值越大,VOUT越稳定。

但是,如果存在与电容性负载并联的电阻性负载RL,则会形成分压器(与RISO / RL成比例),这会导致增益误差。

图3中的电路是图2中电路的改进。

RF通过将VIN前馈至RL来提供DC精度。

碳纤维RISO和RISO通过将输出信号的高频分量反馈回放大器的反相输入来抵消相位裕量的损失,从而在整个反馈环路中保留了相位裕量。

电容驱动可通过增加CF值来增加。

这反过来会减慢脉冲响应。

Figure 3. Indirectly Driving a Capacitive Load with DC Accuracy
Typical Application Circuits
Differential amplifier
The differential amplifier allows the subtraction of two input voltages or cancellation of a signal common the two inputs. It is useful as a computational amplifier in making a differential to single-end conversion or in rejecting a common mode signal. Figure 4. shown the differential amplifier using GS855X.
Figure 4. Differential Amplifier
R+ V −2V +( ) V
1 2 4 1 2 3
R R R R+R R
V ( )
=
OUT R R R1 R R
+R IN
IP +R
REF
3 4 1 3 4 1
If the resistor ratios are equal (i.e. R1=R3 and R2=R4), then
R
V
OUT = V −V +
2 ( )
R IP
1
IN
V
REF
Low Pass Active Filter
The low pass active filter is shown in Figure 5. The DC gain is defined by –R2/R1. The filter has a -20dB/decade roll-off after its corner frequency ƒC=1/(2πR3C1).
Figure 5. Low Pass Active Filter
Instrumentation Amplifier
三重GS859X可以用来构建一个三运放仪表放大器,如图6所示。

图6中的放大器是增益为R2 / R1的高输入阻抗差分放大器。

两个差分电压跟随器确保高放大器的输入阻抗。

.
Figure 6. Instrument Amplifier
.
Package Information SOP-8
MSOP-8
SOT23-5
V2
SOP-14
TSSOP-14
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