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参数资料
| 型号： | ADA4858-3ACPZ-R7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 7/20页 |
| 文件大小： | 0K |
| 描述： | IC OPAMP CF TRPL LP 21MA 16LFCSP |
| 标准包装： | 1 |
| 放大器类型： | 电流反馈 |
| 电路数： | 3 |
| 转换速率： | 600 V/µs |
| -3db带宽： | 600MHz |
| 电流 - 输入偏压： | 8µA |
| 电压 - 输入偏移： | 500µV |
| 电流 - 电源： | 19mA |
| 电流 - 输出 / 通道： | 21mA |
| 电压 - 电源，单路/双路(±)： | 3 V ~ 5.5 V |
| 工作温度： | -40°C ~ 105°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 EP（4x4） |
| 包装： | 标准包装 |
| 产品目录页面： | 768 (CN2011-ZH PDF) |
| 其它名称： | ADA4858-3ACPZ-R7DKR |
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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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADA4858-3ACPZ-RL | 功能描述:IC OPAMP CF TRPL LP 21MA 16LFCSP RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:50 系列:- 放大器类型:通用 电路数:2 输出类型:满摆幅 转换速率:1.8 V/µs 增益带宽积:6.5MHz -3db带宽:4.5MHz 电流 - 输入偏压:5nA 电压 - 输入偏移:100µV 电流 - 电源:65µA 电流 - 输出 / 通道:35mA 电压 - 电源，单路/双路(±):1.8 V ~ 5.25 V，±0.9 V ~ 2.625 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-MSOP 包装:管件 |
| ADA4859-3 | 制造商:AD 制造商全称: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 类别:编程器，开发系统 >> 评估演示板和套件 系列:* 标准包装:1 系列:- 主要目的:电信，线路接口单元（LIU） 嵌入式:- 已用 IC / 零件:IDT82V2081 主要属性:T1/J1/E1 LIU 次要属性:- 已供物品:板，电源，线缆，CD 其它名称:82EBV2081 |
| ADA4859-3ACPZ-R2 | 制造商:Analog Devices 功能描述:VID AMP TRIPLE 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 VIDEO AMPLIFIER TRI 195MHZ LFCSP16 制造商:Analog Devices 功能描述:Sngl Sup HghSpd GN+2 Amp Chrg Pump 制造商:Analog Devices 功能描述:IC, VIDEO AMPLIFIER, TRI, 195MHZ LFCSP16, Gain Bandwidth:195MHz, Supply Voltage Range:3V to 5.5V, Slew Rate:740V/s, No. of Amplifiers:3, Output Current:19mA, Amplifier Output:Single Ended, Operating Temperature Range:-40C to +105C, RoHS Compliant: Yes |
| ADA4859-3ACPZ-R7 | 功能描述:IC AMP 3CH CFB G=2 W/CP 16LFCSP RoHS:是 类别:集成电路 (IC) >> 线性 - 放大器 - 视频放大器和频缓冲器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:50 系列:- 应用:TFT-LCD 面板：VCOM 驱动器 输出类型:满摆幅 电路数:1 -3db带宽:35MHz 转换速率:40 V/µs 电流 - 电源:3.7mA 电流 - 输出 / 通道:1.3A 电压 - 电源，单路/双路(±):9 V ~ 20 V，±4.5 V ~ 10 V 安装类型:表面贴装 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽）裸露焊盘 供应商设备封装:8-uMax-EP 包装:管件 |
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