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| 型號(hào)： | EL8188IW-T7A |
| 廠商： | Intersil |
| 文件頁(yè)數(shù)： | 2/14頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC OPAMP SGL MICROPOWER SOT23-6 |
| 標(biāo)準(zhǔn)包裝： | 250 |
| 放大器類型： | 通用 |
| 電路數(shù)： | 1 |
| 輸出類型： | 滿擺幅 |
| 轉(zhuǎn)換速率： | 0.15 V/µs |
| 增益帶寬積： | 266kHz |
| 電流 - 輸入偏壓： | 1pA |
| 電壓 - 輸入偏移： | 50µV |
| 電流 - 電源： | 55µA |
| 電流 - 輸出 / 通道： | 31mA |
| 電壓 - 電源，單路/雙路(±)： | 2.4 V ~ 5 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | SOT-23-6 |
| 供應(yīng)商設(shè)備封裝： | SOT-23-6 |
| 包裝： | 帶卷 (TR) |
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10
FN7467.7
February 24, 2011
Large differential input voltages can arise from several
sources:
1) During open loop (comparator) operation. The IN+ and IN-
input voltages don’t track.
2) When the amplifier is disabled but an input signal is still
present. An RL or RG to GND keeps the IN- at GND, while
the varying IN+ signal creates a differential voltage. Mux
Amp applications are similar, except that the active channel
VOUT determines the voltage on the IN- terminal.
3) When the slew rate of the input pulse is considerably
faster than the op amp’s slew rate. If the VOUT can’t keep up
with the IN+ signal, a differential voltage results, and visible
distortion occurs on the input and output signals. To avoid
this issue, keep the input slew rate below 0.2V/s, or use
appropriate current limiting resistors.
Output Current Limiting
The EL8188 has no internal current-limiting circuitry. If the
output is shorted, it is possible to exceed the “Absolute
Maximum Rating” for “operating junction temperature”,
potentially resulting in the destruction of the device.
Power Dissipation
It is possible to exceed the +150°C maximum junction
temperature (TJMAX) under certain load and power-supply
conditions. It is therefore important to calculate TJMAX for all
applications to determine if power supply voltages, load
conditions, or package type need to be modified to remain in
the safe operating area. These parameters are related as
follows:
where PDMAX is calculated using:
where:
TMAX = Maximum ambient temperature
θJA = Thermal resistance of the package
PDMAX = Maximum power dissipation of the amplifier
VS = Supply voltage
IMAX = Maximum supply current of the amplifier
VOUTMAX = Maximum output voltage swing of the
application
RL = Load resistance
Proper Layout Maximizes Precision
To achieve the optimum levels of high input impedance (i.e.,
low input currents) and low offset voltage, care should be
taken in the circuit board layout. The PC board surface must
remain clean and free of moisture to avoid leakage currents
between adjacent traces. Surface coating of the circuit board
will reduce surface moisture and provide a humidity barrier,
reducing parasitic resistance on the board. When input
leakage current is a paramount concern, the use of guard
rings around the amplifier inputs will further reduce leakage
currents. Figure 28 shows a guard ring example for a unity
gain amplifier that uses the low impedance amplifier output
at the same voltage as the high impedance input to eliminate
surface leakage. The guard ring does not need to be a
specific width, but it should form a continuous loop around
both inputs. For further reduction of leakage currents, mount
components to the PC board using Teflon standoffs.
Typical Applications
A general-purpose combination pH probe has extremely
high output impedance typically in the range of 10G
Ω to
12G
Ω. Low loss and expensive Teflon cables are often used
to connect the pH probe to the meter electronics. Figure 29
details a low-cost alternative solution using the EL8188 and
a low-cost coax cable. The EL8188 PMOS high impedance
input senses the pH probe output signal and buffers it to
drive the coax cable. Its rail-to-rail input nature also
eliminates the need for a bias resistor network required by
other amplifiers in the same application.
TJMAX
TMAX θJA PDMAX
×
()
+
=
(EQ. 1)
PDMAX
VS ISMAX VS
(
- VOUTMAX)
VOUTMAX
RL
----------------------------
×
+
×
=
(EQ. 2)
IN
V+
FIGURE 28. GUARD RING EXAMPLE FOR UNITY GAIN
AMPLIFIER
HIGH IMPEDANCE INPUT
-
+
3V
+
V+
V-
EL8188
COAX
GENERAL
PURPOSE
COMBINATION
pH PROBE
FIGURE 29. pH PROBE AMPLIFIER
EL8188
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| EL8188IWZ-T7A | 功能描述:IC OPAMP SGL R-R I/O SOT23-6 RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:50 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:1.8 V/µs 增益帶寬積:6.5MHz -3db帶寬:4.5MHz 電流 - 輸入偏壓:5nA 電壓 - 輸入偏移:100µV 電流 - 電源:65µA 電流 - 輸出 / 通道:35mA 電壓 - 電源，單路/雙路(±):1.8 V ~ 5.25 V，±0.9 V ~ 2.625 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬） 供應(yīng)商設(shè)備封裝:10-MSOP 包裝:管件 |
| EL819 | 功能描述:晶體管輸出光電耦合器 Photo-Coupler RoHS:否 制造商:Vishay Semiconductors 輸入類型:DC 最大集電極/發(fā)射極電壓:70 V 最大集電極/發(fā)射極飽和電壓:0.4 V 絕緣電壓:5300 Vrms 電流傳遞比:100 % to 200 % 最大正向二極管電壓:1.65 V 最大輸入二極管電流:60 mA 最大集電極電流:100 mA 最大功率耗散:100 mW 最大工作溫度:+ 110 C 最小工作溫度:- 55 C 封裝 / 箱體:DIP-4 封裝:Bulk |
| EL819M | 功能描述:晶體管輸出光電耦合器 Photo-Coupler RoHS:否 制造商:Vishay Semiconductors 輸入類型:DC 最大集電極/發(fā)射極電壓:70 V 最大集電極/發(fā)射極飽和電壓:0.4 V 絕緣電壓:5300 Vrms 電流傳遞比:100 % to 200 % 最大正向二極管電壓:1.65 V 最大輸入二極管電流:60 mA 最大集電極電流:100 mA 最大功率耗散:100 mW 最大工作溫度:+ 110 C 最小工作溫度:- 55 C 封裝 / 箱體:DIP-4 封裝:Bulk |
| EL819S | 功能描述:晶體管輸出光電耦合器 Photo-Coupler RoHS:否 制造商:Vishay Semiconductors 輸入類型:DC 最大集電極/發(fā)射極電壓:70 V 最大集電極/發(fā)射極飽和電壓:0.4 V 絕緣電壓:5300 Vrms 電流傳遞比:100 % to 200 % 最大正向二極管電壓:1.65 V 最大輸入二極管電流:60 mA 最大集電極電流:100 mA 最大功率耗散:100 mW 最大工作溫度:+ 110 C 最小工作溫度:- 55 C 封裝 / 箱體:DIP-4 封裝:Bulk |
| EL8200 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:200MHz Rail-to-Rail Amplifiers |
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