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參數(shù)資料
| 型號(hào)： | EL8178FWZ-T7A |
| 廠商： | Intersil |
| 文件頁數(shù)： | 3/13頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC OPAMP SGL R-R I/O 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 ~ 5.5 V，±1.2 V ~ 2.75 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) |
11
FN7504.7
May 14, 2008
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 EL8178 and
a low-cost coax cable. The EL8178 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.
Thermocouples are the most popular temperature sensing
devices because of their low cost, interchangeability, and
ability to measure a wide range of temperatures. In
Figure 30, the EL8178 converts the differential thermocouple
voltage into single-ended signal with 10x gain. The EL8178's
rail-to-rail input characteristic allows the thermocouple to be
biased at ground and permits the op amp to operate from a
single 5V supply.
IN
V+
FIGURE 28. GUARD RING EXAMPLE FOR UNITY GAIN
AMPLIFIER
HIGH IMPEDANCE INPUT
-
+
3V
+
V+
V-
EL8178
COAX
GENERAL
PURPOSE
COMBINATION
pH PROBE
FIGURE 29. pH PROBE AMPLIFIER
-
+
5V
+
V+
V-
EL8178
K TYPE
THERMOCOUPLE
10k
Ω
R3
10k
Ω
R2
R4
100k
Ω
R1
100k
Ω
410
μV/°C
FIGURE 30. THERMOCOUPLE AMPLIFIER
EL8178
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