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參數(shù)資料
| 型號： | HCPL-788J |
| 元件分類： | 運(yùn)動控制電子 |
| 英文描述： | Isolation Amplifier with Short Circuit and Overload Detection(具有短路和過載保護(hù)功能的隔離放大器) |
| 中文描述： | 隔離放大器短路和過載檢測（具有短路和過載保護(hù)功能的隔離放大器） |
| 文件頁數(shù)： | 19/20頁 |
| 文件大小： | 277K |
| 代理商： | HCPL-788J |
19
Yes. Some noise energy exists beyond the 30 kHz
bandwidth of the HCPL-788J. An external RC low
pass filter can be used to improve the signal to noise
ratio. For example, a 680
, 4700 pF RC filter will
cut the rms output noise roughly by a factor of 2.
This filter reduces the -3dB signal bandwidth only
by about 10%. In applications needing only a few
kHz bandwidth even better noise performance can
be obtained. The noise spectral density is roughly
400 nV/
√
Hz below 15 kHz (input referred). As
an example, a 2
κ
Hz (680
, 0.1
μ
F) RC low pass
filter reduces output noise to a typical value of
0.08 mVrms.
At present Agilent does not have a standard product
with tighter gain tolerance. A 100
variable
resistor divider can be used to adjust the input
voltage at pin 1, if needed.
Op-amps are used to drive V
OUT
(pin 12) and ABSVAL
(pin 13). These op-amps can swing nearly from rail
to rail when there is no load current. The internal
V
DD2
is about 100 mV below the external V
DD2
. In
addition, the pullup and pulldown output transistors
are not identical in capability. The net result is that
the output can typically swing to within 20 mV of
GND
2
and to within 150 mV of V
DD2
. When V
REF
is
tied to V
DD2
, the output can not reach V
REF
exactly.
This limitation has no effect on gain — only on
maximum output voltage. The output remains linear
and accurate for all inputs between -200 mV and
+200 mV. For the maximum possible swing range,
separate V
REF
and V
DD2
voltages can be used. Since
5.0 V is normally recommended for V
DD2
, use of
4.5 V or 4.096 V references for V
REF
allow the out-
puts to swing all the way up to V
REF
(and down to
typically 20 mV).
No. The LED is used only to transmit a digital
pattern. Gain is determined by a bandgap voltage
reference and the user-provided V
REF
. HP has
accounted for LED degradation in the design of the
product to ensure long life.
Ideally gain would be V
REF
/512 mV, however, due to
internal settling characteristics, the average effective
value of the internal 256 mV reference is 252 mV.
4.2:
Can the signal to noise ratio be improved
4.3:
I need 1% tolerance on gain. Does Agilent
sell a more precise version
4.4:
The output doesn’t go all the way to V
REF
when the input is above full scale.
Why not
4.5:
Does the gain change if the internal
LED light output degrades with time
4.6:
Why is gain defined as V
REF
/504 mV, not
V
REF
/512 mV as expected, based on
Figure 24
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HCPL-788J#500 | 功能描述:隔離放大器 4.5 - 5.5 SV 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-788J/EVAL | 制造商:Avago Technologies 功能描述: |
| HCPL-788J-000E | 功能描述:隔離放大器 4.5 - 5.5 SV 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-788J-500E | 功能描述:隔離放大器 4.5 - 5.5 SV 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-800J | 功能描述:緩沖器和線路驅(qū)動器 PLC Powerline DAA IC RoHS:否 制造商:Micrel 輸入線路數(shù)量:1 輸出線路數(shù)量:2 極性:Non-Inverting 電源電壓-最大:+/- 5.5 V 電源電壓-最小:+/- 2.37 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Reel |
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