參數(shù)資料
型號： AD8432-EVALZ
廠商： Analog Devices Inc
文件頁數(shù)： 14/32頁
文件大?。?/td> 0K
描述： BOARD EVALUATION FOR AD8432
標(biāo)準(zhǔn)包裝： 1
每 IC 通道數(shù)： 2 - 雙
放大器類型： 電壓反饋
輸出類型： 差分
轉(zhuǎn)換速率： 295 V/µs
-3db帶寬： 200MHz
電流 - 輸出 / 通道： 77mA
工作溫度： -40°C ~ 85°C
電流供應(yīng)（主 IC）： 24mA
電壓 - 電源，單路/雙路(±)： 4.5 V ~ 5.5 V
板類型： 完全填充
已供物品： 板
已用 IC / 零件： AD8432
Data Sheet
AD8432
Rev. C | Page 21 of 32
APPLICATIONS INFORMATION
The AD8432 LNA provides precision gain and ultralow noise
performance with minimal external components. Because it is
a high performance part, care must be taken to ensure that it is
configured optimally to attain the best performance and dynamic
range for the system.
TYPICAL SETUP
The internal bias circuitry of the AD8432 sets the input bias
voltage at 3.25 V and the output bias voltage at 2.5 V. It is important
to ac couple the inputs through a capacitor to maintain the internal
dc bias levels. When active input termination is used (RFB), a
decoupling capacitor (CFB) is required to isolate the input and
output bias voltages of the LNA. A typical value for CFB is 0.1 F, but
a smaller value capacitor is more appropriate at higher frequencies.
The unterminated input impedance of the AD8432 is 6.2 kΩ.
Any input resistance between 50 Ω and 6.2 kΩ can be synthesized
using active impedance matching.
At the lowest gain (12.04 dB), the gain response exhibits some
peaking at higher frequencies. A resistor-capacitor shunt net-
work (RC) at the input (see RSHx and CSHx in Figure 69) is
recommended to reduce gain peaking and enhance stability at
higher frequencies.
Table 7 shows the recommended values of RFB, CSH, and RSH for
all four gains and several input impedance combinations. The
values for the CSH and RSH network are determined empirically
and can be customized as needed to optimize performance. As
RIN increases, the value of CSH diminishes, and for higher input
impedance values, no capacitor may be required.
08341-
040
RL
RSH2
15
CSH2
47pF
CL
OUT2+
OUT2–
LNA2
0.1F
FB
120nH
IN2
INL2
IND2
INH2
OPH2
OPL2
GMH2
GOH2
GOL2
GML2
RFB2
CFB2
0.1F
CFB1
0.1F
AD8432
RL
RSH1
15
CSH1
47pF
CL
OUT1+
OUT1–
LNA1
BIAS
0.1F
FB
120nH
IN1
INL1
IND1
INH1
OPH1
OPL1
GMH1
GOH1
GOL1
GML1
FB
120nH
RFB1
G = 12dB
COMM
VPS2
VPS1
ENB
Figure 69. Typical AD8432 Setup, G = 12.04 dB
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