RF 1k Ω 0.1 μF 10 μF –V VO" />
參數(shù)資料
型號： AD8129ARZ-REEL
廠商： Analog Devices Inc
文件頁數(shù)： 29/41頁
文件大?。?/td> 0K
描述： IC AMP DIFF LN LDIST 40MA 8SOIC
標(biāo)準(zhǔn)包裝： 2,500
放大器類型： 差分
電路數(shù)： 1
轉(zhuǎn)換速率： 1070 V/µs
-3db帶寬： 200MHz
電流 - 輸入偏壓： 500nA
電壓 - 輸入偏移： 200µV
電流 - 電源： 13mA
電流 - 輸出 / 通道： 40mA
電壓 - 電源，單路/雙路(±)： 4.5 V ~ 25.2 V，±2.25 V ~ 12.6 V
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 8-SOIC（0.154"，3.90mm 寬）
供應(yīng)商設(shè)備封裝： 8-SO
包裝： 帶卷 (TR)
AD8129/AD8130
Rev. C | Page 34 of 40
RF
1k
Ω
0.1
μF
10
μF
–V
VOUT
+V
0.1
μF
10
μF
VIN
R1
100
Ω
RG
499
Ω
–VS
PD
+VS
+
C1
200pF
AD8130
100
Ω
6
2
5
4
8
1
37
02464-135
Figure 134. An Equalizer Circuit for Composite Video Transmissions
over 300 Meters of Category-5 Cable
20
10
–10
–20
–30
–40
–50
–60
–70
–80
FREQUENCY (Hz)
I/O
R
ESPON
S
E
0
10k
100k
1M
10M
100M
02464-136
Figure 135. Transmission Response of 300 Meters of Category-5 Cable
The feedback network is between Pin 6 and Pin 5 and from
Pin 5 to ground. C1 and RF create a corner frequency of about
800 kHz. The gain increases to provide about 15 dB of boost
at 8 MHz. The response of this circuit is shown in Figure 136.
20
10
–10
–20
–30
–40
–50
–60
–70
–80
FREQUENCY (Hz)
I/O
R
ESPON
S
E
0
10k
100k
1M
10M
100M
02464-137
Figure 136. Frequency Response of Equalizer Circuit
It is difficult to calculate the exact component values via strictly
mathematical means, because the equations for the cable
attenuation are approximate and have functions that are not
simply related to the responses of RC networks. The method
used in this design was to approximate the required response
via graphical means from the frequency response and then
select components that would approximate this response. The
circuit was then built, measured, and finally adjusted to obtain
an acceptable response—in this case, flat to 9 MHz to within
approximately 1 dB (see Figure 137).
20
10
–10
–20
–30
–40
–50
–60
–70
–80
FREQUENCY (Hz)
I/O
R
ESPON
S
E
0
10k
100k
1M
10M
100M
02464-138
Figure 137. Combined Response of Cable Plus Equalizer
OUTPUT OFFSET/LEVEL TRANSLATOR
The circuit in Figure 133 has the reference input (Pin 4) tied to
ground, which produces a ground-referenced output signal. If it
is desired to offset the output voltage from ground, the REF
input can be used (see Figure 138). The level VOFFSET appears at
the output with unity gain.
0.1
μF
–V
VOUT = VIN +VOFFSET
+V
0.1
μF
10
μF
VIN
VOFFSET
–VS
PD
+VS
+
AD8130
10
μF
6
2
5
4
8
1
37
02464-139
Figure 138. The Voltage Applied to Pin 4 to the Unity-Gain Output Voltage
Produced by VIN
If the circuit has a gain higher than unity, the gain must be
factored in. If RG is connected to ground, the voltage applied to
REF is multiplied by the gain of the circuit and appears at the
output—just like a noninverting conventional op amp. This
situation is not always desirable; the user may want VOFFSET to
appear at the output with unity gain.
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