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參數(shù)資料
| 型號： | ADA4858-3ACP-EBZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 7/20頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVAL FOR ADA4858-3ACP |
| 標準包裝： | 1 |
| 每 IC 通道數(shù)： | 3 - 三 |
| 放大器類型： | 電流反饋 |
| 板類型： | 裸（未填充） |
| 已供物品： | 板 |
| 已用 IC / 零件： | 16-LFCSP 封裝 |
Data Sheet
ADA4858-3
Rev. B | Page 15 of 20
R
220A
G
220A
V1
74AC86
U1
ADA4858-3
75
R
301
75
4.7nF
V2
U2
75
G
301
75
4.7nF
V3
U3
75
B
301
75
4.7nF
B
H
ADCMP371AKSZ
200k
0.1F
+5V
2.8k
7.15k
NTA4153
07714-
100
Figure 43. AC-Coupled Video Input with DC Restored Output
DC RESTORE FUNCTION
Having a charge pump gives the ability to take an ac-coupled
input signal and restore its dc 0 V reference. The simplest way
of accomplishing this is to use the blanking interval and the H-
sync signal to set the 0 V reference. Use the H-sync to sample the
dc level during the blanking interval to charge a capacitor and
hold the charge during the video signal. Figure 43 shows the
schematic of the dc restored circuit.
The H-sync coming out of the video source can be either positive
or negative. This is why a polarity correction circuit is used to
produce only a positive going H-sync. The H-sync is fed to a
comparator that produces a high voltage if H-sync is negative and
a low voltage if the H-sync is positive. The H-sync is then fed to
an XOR with the output of the comparator. If the original H-sync
was negative, the output of the XOR is positive because of the
logic high coming from the comparator, causing the XOR to act
as an inverter. However, if the original H-sync is positive, it stays
the same because the output of the comparator is low and the
XOR acts as a buffer.
The result is a positive going H-sync triggering the MOSFET
during the blanking interval. This shorts the 4.7 nF capacitor to
ground, which causes it to charge up by the dc level of the current
signal. When the H-sync goes low, the MOSFET opens and the
capacitor holds the charge during the video signal, making the
output signal referenced to ground or 0 V level.
CLAMP AMPLIFIER
In some applications, a current output DAC driving a resistor
may not have a negative supply available. In such case, the YPbPr
video signal may be shifted up by 300 mV to avoid clamping the
sync tip. These applications require a signal dc clamp on the output
of the video driver to restore the dc level to 0 V reference. The
ADA4858-3 has a charge pump that allows the output to swing
negative; twice the sync tip (600 mV) in G = 2 configuration.
Figure 44 shows the ADA4858-3 in a difference amplifier
configuration. The video signal is connected to the noninverting
side, and a dc bias of 600 mV is injected on the inverting side.
07714-
101
U1
ADA4858-3
R12
75
Y
R1
301
R2
301
R7
75
VCC = 5V
DAC1
Y
U2
R13
75
Pb
R3
301
R4
301
R8
75
VCC = 5V
DAC2
Pb
U3
R14
75
Pr
R5
301
R6
301
R9
75
VCC = 5V
DAC3
Pr
V1
R10
44.2k
R11
6.02k
ADA4860-1
VCC = 5V
C1
0.1F
C2
10F
Figure 44. Clamp Amp
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADA4858-3ACPZ-R2 | 制造商:Analog Devices 功能描述:OP AMP TRIPLE CURRENT FDBK 5.5V 16LFCSP EP - Tape and Reel 制造商:Rochester Electronics LLC 功能描述: 制造商:Analog Devices 功能描述:IC OP-AMP 600MHZ 600V/ LFCSP-16 制造商:Analog Devices 功能描述:Single Supply High Spd RR Video Amp 制造商:Analog Devices 功能描述:IC, OP-AMP, 600MHZ, 600V/s, LFCSP-16, Op Amp Type:High Speed, No. of Amplifiers:3, Bandwidth:600MHz, Slew Rate:600V/s, Supply Voltage Range:3V to 5.5V, Amplifier Case Style:LFCSP, No. of Pins:16 , RoHS Compliant: Yes |
| ADA4858-3ACPZ-R7 | 功能描述:IC OPAMP CF TRPL LP 21MA 16LFCSP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:100 系列:- 放大器類型:通用 電路數(shù):1 輸出類型:- 轉(zhuǎn)換速率:0.2 V/µs 增益帶寬積:- -3db帶寬:- 電流 - 輸入偏壓:100pA 電壓 - 輸入偏移:30µV 電流 - 電源:380µA 電流 - 輸出 / 通道:- 電壓 - 電源，單路/雙路(±):±2 V ~ 18 V 工作溫度:0°C ~ 70°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:管件 |
| ADA4858-3ACPZ-RL | 功能描述:IC OPAMP CF TRPL LP 21MA 16LFCSP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:50 系列:- 放大器類型:通用 電路數(shù):2 輸出類型:滿擺幅 轉(zhuǎn)換速率:1.8 V/µs 增益帶寬積:6.5MHz -3db帶寬:4.5MHz 電流 - 輸入偏壓:5nA 電壓 - 輸入偏移:100µV 電流 - 電源:65µA 電流 - 輸出 / 通道:35mA 電壓 - 電源，單路/雙路(±):1.8 V ~ 5.25 V，±0.9 V ~ 2.625 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬） 供應(yīng)商設(shè)備封裝:10-MSOP 包裝:管件 |
| ADA4859-3 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Single-Supply, Fixed G = 2, High Speed, Video Amplifier with Charge Pump |
| ADA4859-3ACP-EBZ | 功能描述:BOARD EVAL FOR ADA4859-3ACP RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估演示板和套件 系列:* 標準包裝:1 系列:- 主要目的:電信，線路接口單元（LIU） 嵌入式:- 已用 IC / 零件:IDT82V2081 主要屬性:T1/J1/E1 LIU 次要屬性:- 已供物品:板，電源，線纜，CD 其它名稱:82EBV2081 |
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