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參數(shù)資料
| 型號： | HCPL-7870 |
| 英文描述： | Isolated 15-bit A/D Converter(隔離15位A/D轉換器) |
| 中文描述： | 隔離15位A / D轉換器（隔離15位的A / D轉換器） |
| 文件頁數(shù)： | 20/30頁 |
| 文件大?。?/td> | 344K |
| 代理商： | HCPL-7870 |
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Table 2. Isolated A/D Converter Typical Performance Characteristics.
Conversion Time (
μ
s)
Pre-Trigger Mode
0
1
206
103
104
52
40
20
21
11
11
6
Mode
1
2
3
4
5
(dB)
83
79
73
66
53
(bits)
13.5
12.8
11.9
10.7
8.5
2
(
μ
s)
103
52
20
11
6
(kHz)
3.4
6.9
22
45
90
0.8
Note:
Bold italic type indicates Default values.
Applications
Information
Product Description
The HCPL-7860/HCPL-786J
Isolated Modulator (optocoupler)
uses sigma-delta modulation to
convert an analog input signal
into a high-speed (10 MHz)
single-bit digital data stream; the
time average of the modulator’s
single-bit data is directly
proportional to the input signal.
The isolated modulator’s other
main function is to provide
galvanic isolation between the
analog input and the digital
output. An internal voltage
reference determines the full-
scale analog input range of the
modulator (approximately
±
320 mV); an input range of
±
200 mV is recommended to
achieve optimal performance.
The primary functions of the
HCPL-x870 Digital Interface IC
are to derive a multi-bit output
signal by averaging the single-bit
modulator data, as well as to
provide a direct microcontroller
interface. The effective resolution
of the multi-bit output signal is a
function of the length of time
(measured in modulator clock
cycles) over which the average is
taken; averaging over longer
periods of time results in higher
resolution. The Digital Interface
IC can be configured for five
conversion modes which have
different combinations of speed
and resolution to achieve the
desired level of performance.
Other functions of the HCPL-
x870 Digital Interface IC include
a Phase Locked Loop based pre-
trigger circuit that can either give
more precise control of the
effective sampling time or reduce
conversion time to less than 1
μ
s,
a fast over-range detection circuit
that rapidly indicates when the
magnitude of the input signal is
beyond full-scale, an adjustable
threshold detection circuit that
indicates when the magnitude of
the input signal is above a user-
adjustable threshold level, an
offset calibration circuit, and a
second multiplexed input that
allows a second Isolated
Modulator to be used with a
single Digital Interface IC.
The digital output format of the
Isolated A/D Converter is 15 bits
of unsigned binary data. The
input full-scale range and code
assignment is shown in Table 1
below. Although the output con-
tains 15 bits of data, the effective
resolution is lower and is deter-
mined by selected conversion
mode as shown in Table 2 below.
Table 1. Input Full-Scale Range and Code Assignment.
Analog Input
Voltage Input
Full Scale Range
640 mV
Minimum Step Size
20
μ
V
+Full Scale
+320 mV
Zero
0 mV
-Full Scale
-320 mV
Digital Output
32768 LSBs
1 LSB
111111111111111
100000000000000
000000000000000
Signal
Bandwidth
Conversion
Signal-to-
Noise Ratio
Effective
Resolution
Signal
Delay
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| HCPL-788J | 功能描述:隔離放大器 4.5 - 5.5 SV RoHS:否 制造商:Texas Instruments 輸入補償電壓: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 安裝風格:SMD/SMT 封裝 / 箱體:SOP-8 封裝:Tube |
| 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 安裝風格:SMD/SMT 封裝 / 箱體:SOP-8 封裝:Tube |
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