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| 型號： | AD811ARZ-16 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 10/21頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC VIDEO OPAMP HP 16-SOIC |
| 標(biāo)準(zhǔn)包裝： | 47 |
| 應(yīng)用： | 電流反饋 |
| 電路數(shù)： | 1 |
| -3db帶寬： | 140MHz |
| 轉(zhuǎn)換速率： | 2500 V/µs |
| 電流 - 電源： | 16.5mA |
| 電流 - 輸出 / 通道： | 100mA |
| 電壓 - 電源，單路/雙路(±)： | ±4.5 V ~ 18 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-SOIC（0.295"，7.50mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 16-SOIC W |
| 包裝： | 管件 |
| 產(chǎn)品目錄頁面： | 768 (CN2011-ZH PDF) |
Data Sheet
AD811
Rev. F | Page 17 of 20
To generate the 1 V dc needed for the 1 G term, an AD589
reference supplies 1.225 V ± 25 mV to a voltage divider consisting
of resistors R2 through R4. Potentiometer R3 should be adjusted
to provide exactly 1 V at the X1 input.
In this case, an arrangement is shown using dual supplies of ±5 V
for both the AD834 and the AD811. Also, the overall gain is
arranged to be unity at the load when it is driven from a reverse-
terminated 75 line. This means that the dual VCA has to operate
at a maximum gain of +2, rather than +4 as in the VCA circuit
of Figure 46. However, this cannot be achieved by lowering the
feedback resistor because below a critical value (not much less
than 500 ) the peaking of the AD811 may be unacceptable.
This is because the dominant pole in the open-loop ac response
of a current feedback amplifier is controlled by this feedback
resistor. It would be possible to operate at a gain of ×4 and then
attenuate the signal at the output. Instead, the signals have been
attenuated by 6 dB at the input to the AD811; this is the
function of R8 through R11.
Figure 48 is a plot of the ac response of the feedback keyer when
driving a reverse-terminated 50 cable. Output noise and
adjacent channel feedthrough, with either channel fully off and
the other fully on, is about 50 dB to 10 MHz. The feedthrough
at 100 MHz is limited primarily by board layout. For VG = 1 V,
the 3 dB bandwidth is 15 MHz when using a 137 resistor for
R14 and 70 MHz with R14 = 49.9 . For more information on
the design and operation of the VCA and video keyer circuits,
Using the AD834 and AD811 by Brunner, Clarke, and Gilbert,
available on the Analog Devices, Inc. website at www.analog.com.
Figure 48. A Plot of the AC Response of the Video Keyer
–90
–80
–70
–60
–50
–40
–30
–20
–10
0
10
CLOSED-LOOP
GAIN
(dB)
FREQUENCY (Hz)
100k
10k
1M
10M
100M
00866-E-049
R14 = 49.9
R14 = 137
GAIN
ADJACENT CHANNEL
FEEDTHROUGH
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| AD811ARZ-16-REEL | 功能描述:IC OPAMP VIDEO HP 16SOIC RoHS:是 類別:集成電路 (IC) >> 線性 - 放大器 - 視頻放大器和頻緩沖器 系列:- 標(biāo)準(zhǔn)包裝:1,000 系列:- 應(yīng)用:驅(qū)動器 輸出類型:差分 電路數(shù):3 -3db帶寬:350MHz 轉(zhuǎn)換速率:1000 V/µs 電流 - 電源:14.5mA 電流 - 輸出 / 通道:60mA 電壓 - 電源，單路/雙路(±):5 V ~ 12 V，±2.5 V ~ 6 V 安裝類型:表面貼裝 封裝/外殼:20-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:20-QFN 裸露焊盤（4x4） 包裝:帶卷 (TR) |
| AD811ARZ-16-REEL7 | 功能描述:IC OPAMP VIDEO HP 16SOIC RoHS:是 類別:集成電路 (IC) >> 線性 - 放大器 - 視頻放大器和頻緩沖器 系列:- 標(biāo)準(zhǔn)包裝:1,000 系列:- 應(yīng)用:驅(qū)動器 輸出類型:差分 電路數(shù):3 -3db帶寬:350MHz 轉(zhuǎn)換速率:1000 V/µs 電流 - 電源:14.5mA 電流 - 輸出 / 通道:60mA 電壓 - 電源，單路/雙路(±):5 V ~ 12 V，±2.5 V ~ 6 V 安裝類型:表面貼裝 封裝/外殼:20-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:20-QFN 裸露焊盤（4x4） 包裝:帶卷 (TR) |
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