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| 型号： | AD8132ARM-EBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 22/33页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR AD8132ARM |
| 标准包装： | 1 |
| 每 IC 通道数： | 1 - 单 |
| 放大器类型： | 差分 |
| 板类型： | 裸（未填充） |
| 已供物品： | 板 |
| 已用 IC / 零件： | 8-MSOP 封装 |
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AD8132
Rev. I | Page 28 of 32
The actual 3 dB frequency was measured to be 1.12 MHz, as
shown in Figure 78.
FREQUENCY (Hz)
10
10k
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
100k
1M
10M
100M
V
OU
T
/V
IN
(d
B
)
01
035
-07
6
Figure 78. Frequency Response of 1 MHz Low-Pass Filter
HIGH COMMON-MODE OUTPUT IMPEDANCE
AMPLIFIER
Changing the connection to VOCM (Pin 2) can change the common-
mode from low impedance to high impedance. If VOCM is actively
set to a particular voltage, the AD8132 tries to force VOUT, cm to
the same voltage with a relatively low output impedance. All the
previous analysis assumed that this output impedance is arbitrarily
low enough to drive the load condition in the circuit.
However, some applications benefit from high common-mode
output impedance. This is accomplished with the circuit shown
in Figure 79.
RG
348
RF
348
RF
348
RG
348
10
1k
49.9
0
10
35
-07
7
Figure 79. High Common-Mode, Output Impedance, Differential Amplifier
VOCM is driven by a resistor divider that measures the output
common-mode voltage. Thus, the common-mode output voltage
takes on the value that is set by the driven circuit. In this case,
it comes from the center point of the termination at the receive
end of a 10 meter length of Category 5 twisted pair cable.
If the receive end common-mode voltage is set to ground, it is
well defined at the receive end. Any common-mode signal that
is picked up over the cable length due to noise appears at the
transmit end and must be absorbed by the transmitter. Thus, it is
important that the transmitter have adequate common-mode
output range to absorb the full amplitude of the common-mode
signal coupled onto the cable and therefore prevent clipping.
Another way to look at this is that the circuit performs what is
sometimes called a transformer action. One main difference is
that the AD8132 passes dc while transformers do not.
A transformer can also be easily configured to have either a high or
low common-mode output impedance. If the transformers center
tap is connected to a solid voltage reference, it sets the common-
mode voltage on the secondary side of the transformer. In this case,
if one of the differential outputs is grounded, the other output has
half of the differential output signal. This keeps the common-mode
voltage at ground, where it is required to be due to the center tap
connection. This is analogous to the AD8132 operating with a low
output impedance common mode (see Figure 80).
VDIFF
VOCM
01
03
5
-07
8
Figure 80. Transformer with Low Output Impedance Secondary Set at VOCM
If the center tap of the secondary of a transformer is allowed to
float as shown in Figure 81 (or if there is no center tap), the
transformer has high common-mode output impedance. This
means that the common mode of the secondary is determined
by what it is connected to and not by anything to do with the
transformer itself.
VDIFF
NC
01
03
5-
07
9
Figure 81. Transformer with High Output Impedance Secondary
If one of the differential ends of the transformer is grounded,
the other end swings with the full output voltage. This means
that the common mode of the output voltage is one-half of the
differential output voltage. However, this shows that the common
mode is not forced via low impedance to a given voltage. The
common-mode output voltage can be easily changed to any voltage
through its other output terminals.
The AD8132 can exhibit the same performance when one of
the outputs in Figure 79 is grounded. The other output swings
at the full differential output voltage. The common-mode signal
is measured by the voltage divider across the outputs and input
to VOCM. This, then, drives VOUT, cm to the same level. At higher
frequencies, it is important to minimize the capacitance on
the VOCM node; otherwise, phase shifts can compromise the
performance. The voltage divider resistances can also be lowered
for better frequency response.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD8132ARM-REEL | 制造商:Analog Devices 功能描述:SP Amp DIFF AMP Single ±5.5V/11V 8-Pin MSOP T/R |
| AD8132ARM-REEL7 | 制造商:Analog Devices 功能描述:SP Amp DIFF AMP Single ±5.5V/11V 8-Pin MSOP T/R 制造商:Analog Devices 功能描述:IC AMP DIFFERENTIAL |
| AD8132ARMZ | 功能描述:IC AMP DIFF LDIST LP 70MA 8MSOP RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 产品培训模块:Differential Circuit Design Techniques for Communication Applications 标准包装:1 系列:- 放大器类型:RF/IF 差分 电路数:1 输出类型:差分 转换速率:9800 V/µs 增益带宽积:- -3db带宽:2.9GHz 电流 - 输入偏压:3µA 电压 - 输入偏移:- 电流 - 电源:40mA 电流 - 输出 / 通道:- 电压 - 电源，单路/双路(±):3 V ~ 3.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:16-VQFN 裸露焊盘，CSP 供应商设备封装:16-LFCSP-VQ 包装:剪切带 (CT) 产品目录页面:551 (CN2011-ZH PDF) 其它名称:ADL5561ACPZ-R7CT |
| AD8132ARMZ | 制造商:Analog Devices 功能描述:IC - Differential Amplifier 制造商:Analog Devices 功能描述:IC, DIFF AMP, 350MHZ, 1200V/ uS, MSOP-8 |
| AD8132ARMZ1 | 制造商:AD 制造商全称:Analog Devices 功能描述:Low Cost, High Speed Differential Amplifier |
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