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| 型號(hào)： | ISL28617FVZ-T13 |
| 廠商： | Intersil |
| 文件頁數(shù)： | 5/19頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC INSTRUMENTATION AMP 24TSSOP |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 放大器類型： | 儀表 |
| 電路數(shù)： | 1 |
| 輸出類型： | 差分，滿擺幅 |
| 轉(zhuǎn)換速率： | 4 V/µs |
| -3db帶寬： | 5.5MHz |
| 電流 - 輸入偏壓： | 200pA |
| 電壓 - 輸入偏移： | 30µV |
| 電流 - 電源： | 2.05mA |
| 電流 - 輸出 / 通道： | 45mA |
| 電壓 - 電源，單路/雙路(±)： | 8 V ~ 40 V，±4 V ~ 20 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 24-TSSOP（0.173"，4.40mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 24-TSSOP |
| 包裝： | 帶卷 (TR) |
ISL28617
13
FN6562.1
October 17, 2013
Applications Information
Section “1. General Description”: contains the ISL28617
functional and performance objectives and description of
operation.
Section “2. Designing with the ISL28617”: contains the
application circuit design Equations and guidelines for achieving
the desired DC and AC performance levels.
provides Equations for predicting DC offset voltage and noise of
the finished design.
1. General Description
The ISL28617 Instrumentation Amplifier was developed to
accomplish the following:
Provide a fully differential, rail-to-rail output for optimally
driving ADCs.
Limit the output swing to prevent output overdrive.
Allow any gain, including attenuation.
Maximize gain accuracy by removing on-chip component
tolerances and external PC board parasitic resistance.
Enable user control of amplifier precision level with choice of
external resistor tolerance.
Maintain CMRR>100dB and remove CMRR sensitivity to gain
resistor tolerance.
Provide a level shift interface from bipolar analog input signal
sources to unipolar, and bipolar ADC output terminations.
Functional Description
Figure 31 shows the functional block diagram for the ISL28617.
Input GM Amplifier
The input stage consists of high performance, wide band
amplifiers A1, A2, GM drive transistors Q1, Q2, and input gain
resistor RIN. Current drive for Q1 and Q2 emitters are provided by
matched pair of 100A current sinks. A unity gain buffer from
each input (IN+, IN-) to the terminals of the input resistor, RIN, is
formed by the connection of the Kelvin resistor sense pins and
drive pins to the terminals of the input resistor, as shown in
Figure 31. In this configuration, the voltage across the input
resistor RIN is equal to the input differential voltage across IN+
and IN-.
The input GM stage operates by creating a current difference in
the collector currents Q1 and Q2 in response to the voltage
difference between the IN+ and IN- pins. When the input voltage
applied to the IN+ and IN- pins is zero, the voltage across the
terminals of the gain resistor RIN, is also zero. Since there is no
current flow through the gain resistor, the transistors Q1 and Q2
collector currents I1 and I2 are equal.
A change in the input differential voltage causes an equivalent
voltage drop across the input gain resistor RIN, and the resulting
current flow through RIN, causes an imbalance in Q1 and Q2
Feedback GM Amplifier
The feedback amplifiers A3 and A4 form a differential
trans-conductance amplifier identical to the input stage. The
input terminals (VFB+, VFB-) connect to the ISL28617 differential
output terminals (+VOUT, -VOUT), so that the output voltage also
appears across the feedback gain resistor RFB.
Operation is the same as the input GM stage and the differential
Error Amplifier A5, Output Amplifier A6
(Figure 31)
Amplifiers A5 and A6 act together to form a high gain,
differential I/O trans-impedance amplifier. Differential current
amplifier A5 sums the differential currents (I1+I3 and I2+I4) from
the input and feedback GM amplifiers. From that summation, a
differential error voltage is sent to A6, which generates the
rail-to-rail differential output drive to the +VOUT and -VOUT pins.
The external connection of the output pins to the feedback
amplifier closes a servo loop where a change in the differential
input voltage is converted into differential current imbalances at
Current I1 sums with current I3 from the feedback stage, and I2
sums with I4. A5 senses the difference between current pairs I1,
I3 and I2, I4. A difference voltage is generated, amplified and fed
back to the feedback amplifier, which creates correction currents
Therefore, at equilibrium:
and solving for VOUT as a function of VIN, RIN and RFB, yields
Equation 6:
which is general form of the gain Equation for the ISL28617.
(EQ. 1)
I1= 100A + (VIN+- VIN-)/RIN
(EQ. 2)
I2= 100A - (VIN+- VIN-)/RIN
(EQ. 3)
I3 = 100A - {(+VOUT) - (-VOUT)}/RFB
(EQ. 4)
I4 =100A +{(+VOUT) - (-VOUT)}/RFB
(EQ. 5)
I1 = I3 and I2 = I4
(EQ. 6)
VOUT = VIN*RFB/RIN ;
Where VOUT = (+VOUT) - (-VOUT) and VIN = IN+ - IN-
(EQ. 7)
Gain = VOUT/VIN = RFB/RIN
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| ISL28617FVZ-T7 | 功能描述:IC INSTRUMENTATION AMP 24TSSOP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:75 系列:MicroAmplifier™ 放大器類型:通用 電路數(shù):1 輸出類型:滿擺幅 轉(zhuǎn)換速率:0.03 V/µs 增益帶寬積:100kHz -3db帶寬:- 電流 - 輸入偏壓:1pA 電壓 - 輸入偏移:60µV 電流 - 電源:20µA 電流 - 輸出 / 通道:5mA 電壓 - 電源，單路/雙路(±):2.3 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:8-SOIC 包裝:管件 |
| ISL28617FVZ-T7A | 功能描述:儀表放大器 40V Precision Amp w/Diff ADC driver RoHS:否 制造商:Texas Instruments 通道數(shù)量: 輸入補(bǔ)償電壓:150 V 可用增益調(diào)整: 最大輸入電阻:10 kOhms 共模抑制比（最小值）:88 dB 工作電源電壓:2.7 V to 36 V 電源電流:200 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:MSOP-8 封裝:Bulk |
| ISL28617SM10EV1Z | 制造商:Intersil Corporation 功能描述:ISL28617 EVAL BOARD 1 - 24LD TSSOP - ROHS COMPLIANT - Bulk 制造商:Intersil Corporation 功能描述:BOARD EVAL FOR ISL28617 制造商:Intersil 功能描述:ISL28617 EVAL |
| ISL28617SMR25EV1Z | 制造商:Intersil Corporation 功能描述:ISL28617 EVAL BOARD 1 - 24LD TSSOP - ROHS COMPLIANT - Bulk 制造商:Intersil Corporation 功能描述:BOARD EVAL FOR ISL28617 制造商:Intersil 功能描述:ISL2617 EVAL |
| ISL28617VY100EV1Z | 功能描述:放大器 IC 開發(fā)工具 ISL28617VY100 EVAL RoHS:否 制造商:International Rectifier 產(chǎn)品:Demonstration Boards 類型:Power Amplifiers 工具用于評(píng)估:IR4302 工作電源電壓:13 V to 23 V |
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