參數(shù)資料
型號(hào)： HCPL-786J-XXXE
英文描述： Optically Isolated Sigma-Delta Modulator
中文描述： 光隔離Σ-Δ調(diào)制器
文件頁數(shù)： 13/18頁
文件大小： 560K
代理商： HCPL-786J-XXXE
13
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.
HCPL-7860/HCPL-786J can be
used together with HCPL-0872,
Digital Interface IC or a digital
filter. The primary functions of
the HCPL-0872 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-
0872 Digital Interface IC
include a Phase Locked Loop
based pre-trigger circuit that
can either give more precise
Table 1. Input Full-Scale Range and Code Assignment.
control of the effective
sampling time or reduce
conversion time to less than 1
ìs, 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 contains 15 bits of
data, the effective resolution is
lower and is determined by
selected conversion mode as
shown in Table 2 below.
Table 2. Isolated A/D Converter Typical Performance Characteristics.
Notes: Bold italic type indicates Default values.
Analog Input
Voltage Input
Digital Output
Full Scale Range
640 mV
32768 LSBs
Minimum Step Size
20 μV
1 LSB
+Full Scale
+320 mV
111111111111111
Zero
0 mV
100000000000000
-Full Scale
-320 mV
000000000000000
Conversion Mode
Signal-to-
Noise Ratio
(dB)
Effective
Resolution
(bits)
Conversion Time (μs)
Signal
Delay(μs)
Signal
Bandwidth
(kHz)
Pre-Trigger Mode
0
1
2
1
83
13.5
205
102
0.2
102
3.4
2
79
12.8
103
51
51
6.9
3
73
11.9
39
19
19
22
4
66
10.7
20
10
10
45
5
53
8.5
10
5
5
90
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相關(guān)代理商/技術(shù)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(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#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
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