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参数资料
| 型号： | ISO120SGQ |
| 元件分类： | 隔离放大器 |
| 英文描述： | Precision Low Cost ISOLATION AMPLIFIER |
| 中文描述： | 精密低成本隔离放大器 |
| 文件页数： | 14/16页 |
| 文件大小： | 184K |
| 代理商： | ISO120SGQ |
7
ISO120/121
f
3dB ≈
1. 2
200 k
150 pF + C
2
()
FIGURE 1. Block Diagram.
C
1, C2 ISO120/121
EXTERNAL CLOCK
MODULATOR, DEMODULATOR
FREQUENCY RANGE
EXTERNAL CAPACITOR
400kHz to 700kHz
none
200kHz to 400kHz
500pF
100kHz to 200kHz
1000pF
50kHz to 100kHz
2200pF
20kHz to 50kHz
4700pF
10kHz to 20kHz
0.01
F
5kHz to 10kHz
0.022
F
The value of the external modulator capacitor, C
1, depends on
the frequency of the external clock signal. Table I lists
recommended values.
Synchronizing to a 400kHz to 700kHz
Square-Wave External Clock
At frequencies above 400kHz, an internal clamp and filter
provides signal conditioning so that a square-wave signal can
be used to directly drive the ISO120/121. A square-wave
external clock signal can be used to directly drive the ISO120/
121 ext osc pin if: the signal is in the 400kHz to 700kHz
frequency range with a 25% to 75% duty cycle, and
±3V to
±20V level. Details of the internal clamp and filter circuitry
are shown in Figure 1.
Synchronizing to a 10% to 90%
Duty-cycle External Clock
With the addition of the signal conditioning circuit shown in
Figure 2, any 10% to 90% duty-cycle square-wave signal can
be used to drive the ISO120/121 ext osc pin. With the values
shown, the circuit can be driven by a 4Vp-p TTL signal. For
a higher or lower voltage input, increase or decrease the 1k
resistor, R
X, proportionally. e.g. for a ±4V square wave
(8Vp-p) R
X should be increased to 2k.
The value of C
X used in the Figure 2 circuit depends on the
frequency of the external clock signal. Table II shows recom-
mended capacitor values.
Note: For external clock frequencies below 400kHz, external
modulator/demodulator capacitors are required on the
ISO120/121 as before.
TABLE I. Recommended ISO120/121 External Modulator/
Demodulator Capacitor Values vs External Clock
Frequency.
The value of the external demodulator capacitor, C
2, depends
on the value of the external modulator capacitor. To assure
stability, C
2 must be greater than 0.8 C1. A larger value for
C
2 will decrease bandwidth and improve stability:
Where:
f
–3dB ≈ –3dB bandwidth of ISO amp with external C2 (Hz)
C
2 = External demodulator capacitor (f)
For example, with C
2 = 0.01F, the f–3dB bandwidth of the
ISO120/121 is approximately 600Hz.
1pF
S/H
G = 1
S/H
G = 6
Sense
V
OUT
Signal
Com 2
Gnd 2 –V
S2
+V
S2
Gnd 1 –V
S1
+V
S1
Signal
Com 1
V
IN
C
1H
C
1L
C
1
(1)
200k
150pF
A1
100A
Sense
200A
X
100A
Sense
200A
200k
150pF
C
2L
C
2H
C
2
(1)
X
A2
Isolation Barrier
NOTE: (1) Optional. See text.
30k
16k
Ext
Osc
16k
50pF
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相关代理商/技术参数 |
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| ISO121 | 制造商:BB 制造商全称:BB 功能描述:Precision Low Cost ISOLATION AMPLIFIER |
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| ISO1212DBQ | 功能描述:INDUSTRIAL IO 制造商:texas instruments 系列:- 包装:管件 零件状态:在售 应用:PLC 数字输入模块 接口:数字 电压 - 电源:2.25 V ~ 5.5 V 封装/外壳:16-SSOP（0.154"，3.90mm 宽） 供应商器件封装:16-SSOP 安装类型:表面贴装 标准包装:75 |
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