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ADA4412-3ARQZ-RL

更新时间： 2024-01-24 19:52:59

品牌	Logo	应用领域
亚德诺 - ADI		消费电路商用集成电路光电二极管
页数	文件大小	规格书
16页	386K
描述
Integrated Triple Video Filter with Selectable Cutoff Frequencies for RGB, HD/SD

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技术参数
数据手册

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ADA4412-3ARQZ-RL 技术参数

是否无铅：	含铅	是否Rohs认证：	符合
生命周期：	Active	零件包装代码：	SSOP
包装说明：	SSOP, SSOP20,.25	针数：	20
Reach Compliance Code：	compliant	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	5.07
Is Samacsys：	N	其他特性：	IT CAN ALSO OPERATE WITH 4.5V TO 12V SINGLE SUPPLY
商用集成电路类型：	CONSUMER CIRCUIT	JESD-30 代码：	R-PDSO-G20
JESD-609代码：	e3	长度：	8.6614 mm
湿度敏感等级：	1	功能数量：	1
端子数量：	20	最高工作温度：	85 °C
最低工作温度：	-40 °C	封装主体材料：	PLASTIC/EPOXY
封装代码：	SSOP	封装等效代码：	SSOP20,.25
封装形状：	RECTANGULAR	封装形式：	SMALL OUTLINE, SHRINK PITCH
峰值回流温度（摄氏度）：	260	电源：	+-5 V
认证状态：	Not Qualified	座面最大高度：	1.7526 mm
子类别：	Other Consumer ICs	最大供电电压 (Vsup)：	6 V
最小供电电压 (Vsup)：	2.25 V	表面贴装：	YES
温度等级：	INDUSTRIAL	端子面层：	Matte Tin (Sn)
端子形式：	GULL WING	端子节距：	0.635 mm
端子位置：	DUAL	处于峰值回流温度下的最长时间：	40
宽度：	3.9116 mm	Base Number Matches：	1

ADA4412-3ARQZ-RL 数据手册

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ADA4412-3

75Ω

DUAL SUPPLY

CABLE

220μF

+5V

9.53kΩ

+5V

75Ω

ADA4412-3

9.53kΩ

1kΩ

75Ω

LEVEL1

0.1μF

LEVEL2

0.1μF

75Ω

CABLE

1kΩ

9.53kΩ

–5V

SINGLE SUPPLY

Figure 18. Driving Two AC-Coupled Loads with Two Coupling Capacitors

+5V

75Ω

CABLE

9.09kΩ

1kΩ

9.09kΩ

1kΩ

75Ω

ADA4412-3

LEVEL1

0.1μF

LEVEL2

0.1μF

470μF

75Ω

CABLE

Figure 16. Generating Fully Adjustable Output Offsets

75Ω

+5V

10kΩ

+5V

DNP

Figure 19. Driving Two AC-Coupled Loads with One Common Coupling Capacitor

PRINTED CIRCUIT BOARD LAYOUT

LEVEL1

0.1μF

LEVEL2

DNP

As with all high speed applications, attention to printed

circuit board layout is of paramount importance. Standard high

speed layout practices should be adhered to when designing

with the ADA4412-3. A solid ground plane is recommended,

and surface-mount, ceramic power supply decoupling

capacitors should be placed as close as possible to the supply

pins. All of the ADA4412-3 GND pins should be connected to

the ground plane with traces that are as short as possible.

Controlled impedance traces of the shortest length possible

should be used to connect to the signal I/O pins and should not

pass over any voids in the ground plane. A 75 Ω impedance

level is typically used in video applications. All signal outputs of

the ADA4412-3 should include series termination resistors

when driving transmission lines.

634Ω

0Ω

Figure 17. Flexible Circuits to Set the LEVEL1 and LEVEL2 Inputs to

Obtain a 600 mV Output Offset on a Single Supply

INPUT AND OUTPUT COUPLING

Inputs to the ADA4412-3 are normally dc-coupled. Ac coupling

the inputs is not recommended; however, if ac coupling is

necessary, suitable circuitry must be provided following the ac

coupling element to provide proper dc level and bias currents at

the ADA4412-3 input stages. The ADA4412-3 outputs can be

either ac- or dc-coupled.

When driving single ac-coupled loads in standard 75 Ω video

distribution systems, 22ꢀ μF coupling capacitors are

recommended for use on all but the chrominance signal output.

Since the chrominance signal is a narrow-band modulated

carrier, it has no low frequency content and can therefore be

coupled with a ꢀ.1 μF capacitor.

When the ADA4412-3 receives its inputs from a device

with current outputs, the required load resistor value for

the output current is often different from the characteristic

impedance of the signal traces. In this case, if the interconnec-

tions are sufficiently short (<< ꢀ.1 wavelength), the trace does

not have to be terminated in its characteristic impedance.

Traces of 75 ꢁ can be used in this instance, provided their

lengths are an inch or two at the most. This is easily achieved

because the ADA4412-3 and the device feeding it are usually

adjacent to each other, and connections can be made that are

less than one inch in length.

There are two ac coupling options when driving two loads from

one output. One simply uses the same value capacitor on the

second load, while the other is to use a common coupling

capacitor that is at least twice the value used for the single load

(see Figure 18 and Figure 19).

When driving two parallel 15ꢀ Ω loads (75 Ω effective load),

the 3 dB bandwidth of the filters typically varies from that of

the filters with a single 15ꢀ Ω load. For the 9 MHz and 18 MHz

filters, the typical variation is within 1.ꢀ%; for the 36 MHz

filters, the typical variation is within 2.5%.

VIDEO ENCODER RECONSTRUCTION FILTER

The ADA4412-3 is easily applied as a reconstruction filter at the

DAC outputs of a video encoder. Figure 2ꢀ illustrates how to use

the ADA4412-3 in this type of application with an ADV7322 video

encoder in a single-supply application with ac-coupled outputs.

Rev. 0 | Page 11 of 16

1...8 9 101112 13 14...16

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