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參數(shù)資料
| 型號： | HCPL-7840 |
| 元件分類： | 運(yùn)動控制電子 |
| 英文描述： | Isolation Amplifier(隔離放大器) |
| 中文描述： | 隔離放大器（隔離放大器） |
| 文件頁數(shù)： | 17/19頁 |
| 文件大?。?/td> | 244K |
| 代理商： | HCPL-7840 |
17
2.4: How do I ensure that the HCPL-7840 is not destroyed as a result of short circuit conditions
which cause voltage drops across the sense resistor that exceed the ratings of the HCPL-7840’s
inputs
Select the sense resistor so that it will have less than 5 V drop when short circuits occur. The only other
requirement is to shut down the drive before the sense resistor is damaged or its solder joints melt. This
ensures that the input of the HCPL-7840 can not be damaged by sense resistors going open-circuit.
3. ISOLATION AND INSULATION
3.1: How many volts will the HCPL-7840 withstand
The momentary (1 minute) withstand voltage is 3750 V rms per UL 1577 and CSA Component Acceptance
Notice #5.
4. ACCURACY
4.1: Can the signal to noise ratio be improved
Yes. Some noise energy exists beyond the 100 kHz bandwidth of the HCPL-7800(A). Additional filtering
using different filter R,C values in the post-amplifier application circuit can be used to improve the signal to
noise ratio. For example, by using values of R3 = R4 = 10 k
, C5 = C6 = 470 pF in the application circuit
the rms output noise will be cut roughly by a factor of 2. In applications needing only a few kHz bandwidth
even better noise performance can be obtained. The noise spectral density is roughly 500 nV/
√
Hz below
20 kHz (input referred).
4.2: I need 1% tolerance on gain. Does HP sell a more precise version
The HCPL-7800A is gain-trimmed and matched to within
±
1% tolerance (at room temperature.)
4.3: Does the gain change if the internal LED light output degrades with time
No. The LED is used only to transmit a digital pattern. HP has accounted for LED degradation in the design
of the product to ensure long life.
5. POWER SUPPLIES AND START-UP
5.1: What are the output voltages before the input side power supply is turned on
V
O+
is close to 1.29 V and V
O-
is close to 3.80 V. This is equivalent to the output response at the condition
that LED is completely off.
5.2: How long does the HCPL-7840 take to begin working properly after power-up
Within 1 ms after V
DD1
and V
DD2
powered the device starts to work. But it takes longer time for output to
settle down completely. In case of the offset measurement while both inputs are tied to ground there is
initially V
OS
adjustment (about 60 ms). The output completely settles down in 100 ms after device powering
up.
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| HCPL-7850 | Hermetically Sealed Analog Isolation Amplifier(密封模擬隔離放大器) |
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| HCPL-7870 | Isolated 15-bit A/D Converter(隔離15位A/D轉(zhuǎn)換器) |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HCPL-7840#060 | 功能描述:隔離放大器 4.5 - 5.5 SV 8 dB RoHS:否 制造商:Texas Instruments 輸入補(bǔ)償電壓:1.5 mV 共模抑制比（最小值）:95 dB 帶寬:60 KHz 工作電源電壓:3.3 V 電源電流:8 mA 工作溫度范圍:- 40 C to + 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOP-8 封裝:Tube |
| HCPL-7840#300 | 功能描述:隔離放大器 4.5 - 5.5 SV 8 dB RoHS:否 制造商:Texas Instruments 輸入補(bǔ)償電壓:1.5 mV 共模抑制比（最小值）:95 dB 帶寬:60 KHz 工作電源電壓:3.3 V 電源電流:8 mA 工作溫度范圍:- 40 C to + 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOP-8 封裝:Tube |
| HCPL-7840#360 | 功能描述:隔離放大器 4.5 - 5.5 SV 8 dB RoHS:否 制造商:Texas Instruments 輸入補(bǔ)償電壓:1.5 mV 共模抑制比（最小值）:95 dB 帶寬:60 KHz 工作電源電壓:3.3 V 電源電流:8 mA 工作溫度范圍:- 40 C to + 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOP-8 封裝:Tube |
| HCPL-7840#500 | 功能描述:隔離放大器 4.5 - 5.5 SV 8 dB RoHS:否 制造商:Texas Instruments 輸入補(bǔ)償電壓:1.5 mV 共模抑制比（最小值）:95 dB 帶寬:60 KHz 工作電源電壓:3.3 V 電源電流:8 mA 工作溫度范圍:- 40 C to + 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOP-8 封裝:Tube |
| HCPL-7840#560 | 功能描述:隔離放大器 4.5 - 5.5 SV 8 dB RoHS:否 制造商:Texas Instruments 輸入補(bǔ)償電壓:1.5 mV 共模抑制比（最小值）:95 dB 帶寬:60 KHz 工作電源電壓:3.3 V 電源電流:8 mA 工作溫度范圍:- 40 C to + 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOP-8 封裝:Tube |
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