AD8170

更新时间： 2024-02-15 13:31:07

品牌	Logo	应用领域
亚德诺 - ADI		复用器开关放大器
页数	文件大小	规格书
16页	476K
描述
250 MHz, 10 ns Switching Multiplexers w/Amplifier

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技术参数
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AD8170 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：	SOIC
包装说明：	SOP, SOP8,.25	针数：	8
Reach Compliance Code：	compliant	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	0.95
模拟集成电路 - 其他类型：	VIDEO MULTIPLEXER	JESD-30 代码：	R-PDSO-G8
JESD-609代码：	e3	长度：	4.9 mm
湿度敏感等级：	1	标称负供电电压 (Vsup)：	-5 V
信道数量：	2	功能数量：	1
端子数量：	8	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：	SOP	封装等效代码：	SOP8,.25
封装形状：	RECTANGULAR	封装形式：	SMALL OUTLINE
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：	1.75 mm
子类别：	Multiplexer or Switches	最大供电电流 (Isup)：	11 mA
标称供电电压 (Vsup)：	5 V	表面贴装：	YES
最长接通时间：	17 ns	技术：	BIPOLAR
温度等级：	INDUSTRIAL	端子面层：	Matte Tin (Sn)
端子形式：	GULL WING	端子节距：	1.27 mm
端子位置：	DUAL	处于峰值回流温度下的最长时间：	30
宽度：	3.9 mm	Base Number Matches：	1

AD8170 数据手册

AD8170/AD8174

Signal traces should be as short as possible. Stripline or

microstrip techniques should be used for long signal traces

(longer than about 1 inch). These should be designed with a

characteristic impedance of 50 Ω or 75 Ω and be properly

terminated at each end using surface mount components.

= 2V p-p

OUT

G = +2

= 499⍀ (AD8170R)

= 549⍀ (AD8174R)

= 300PF

= 15⍀

S(OUT)

OUTPUT

Careful layout is imperative to minimize crosstalk. Guards

(ground or supply traces) must be run between all signal traces

to limit direct capacitive coupling. Input and output signal lines

should fan out away from the mux as much as possible. If

multiple signal layers are available, a buried stripline structure

having ground plane above, below, and between signal traces

will have the best crosstalk performance.

= ±1V

OUT

INPUT

= ±0.5V

20ns/DIV

Return currents flowing through termination resistors can also

increase crosstalk if these currents flow in sections of the finite-

impedance ground circuit that is shared between more than one

input or output. Minimizing the inductance and resistance of the

ground plane can reduce this effect, but further care should be

taken in positioning the terminations. Terminating cables directly

at the connectors will minimize the return current flowing on the

board, but the signal trace between the connector and the mux will

look like an open stub and will degrade the frequency response.

Moving the termination resistors close to the input pins will

improve the frequency response, but the terminations from

neighboring inputs should not have a common ground return.

Figure 25. Pulse Response Driving a Large Load

Capacitor, C_L= 300 pF

Overload Behavior and Recovery

There are three important overload conditions: input voltage

overdrive, output voltage overdrive and current overload at the

amplifier’s negative feedback input.

At a gain of 1, recovery from driving the input voltages beyond

the voltage range of the input switches is very quick, typically

less than 30 ns. Recovery from output overdrive is somewhat

slower and depends on how much the output is overdriven.

Recovery from 15% overdrive is under 60 ns. 50% overdrive

produces recovery times of about 85 ns.

APPLICATIONS

8-to-1 Video Multiplexer

Input overdrive in a high gain application can result in a large

current flow in the input stage. This current is internally limited

to 40 mA. The effect on total power dissipation should be taken

into account.

Two AD8174 4-to-1 multiplexers can be combined with a single

digital inverter to yield an 8-to-1 multiplexer as shown in Figure

26. The ENABLE control pin allows the two op amp outputs to

be connected together directly. Taking the ENABLE pin high

shuts off the supply current to the output op amp and places the

op amp’s output and inverting input (Pin 12, –V_IN) in high

impedance states.

LAYOUT CONSIDERATIONS:

Realizing the high speed performance attainable with the

AD8170 and AD8174 requires careful attention to board layout

and component selection. Proper RF design techniques and low

parasitic component selection are mandatory.

The two least significant bits (LSBs) of the address lines

connect directly to the A0 and A1 inputs of both AD8174

devices. The third address line connects directly to the

ENABLE input on one device and is inverted before being

applied to the ENABLE input on the second device. As a

result, when one device is enabled, the second device presents a

high impedance. The op amp of the enabled device must

however drive both feedback networks ((549 Ω + 549 Ω)/2).

Wire wrap boards, prototype boards, and sockets are not

recommended because of their high parasitic inductance and

capacitance. Instead, surface-mount components should be

soldered directly to a printed circuit board (PCB). The PCB

should have a ground plane covering all unused portions of the

component side of the board to provide a low impedance

ground path. The ground plane should be removed from the

area near input and output pins to reduce stray capacitance.

The gain of this multiplexer has been set to +2 in this example.

This gives an overall gain of +1 when back terminated lines are

used. In applications where switching and settling times are

critical, the digital control pins (A0, A1 and ENABLE) should

also be appropriately terminated (with either 50 Ω or 75 Ω).

Chip capacitors should be used for supply bypassing. One end

of the capacitor should be connected to the ground plane and

the other within 1/4 inch of each power pin. An additional large

(4.7 µF–10 µF) tantalum capacitor should be connected in

parallel with each of the smaller capacitors for low impedance

supply bypassing over a broad range of frequencies.

REV. 0

–10–

1...7 8 91011 12 13...16

中文翻译

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与AD8170相关器件

型号	品牌	获取价格	描述	数据表
AD8170AN	ADI	获取价格	250 MHz, 10 ns Switching Multiplexers w/Amplifier
AD8170AN	ROCHESTER	获取价格	2-CHANNEL, VIDEO MULTIPLEXER, PDIP8, PLASTIC, DIP-8
AD8170ANZ	ADI	获取价格	暂无描述
AD8170ANZ	ROCHESTER	获取价格	2-CHANNEL, VIDEO MULTIPLEXER, PDIP8, PLASTIC, DIP-8
AD8170AR	ADI	获取价格	250 MHz, 10 ns Switching Multiplexers w/Amplifier
AD8170AR	ROCHESTER	获取价格	2-CHANNEL, VIDEO MULTIPLEXER, PDSO8, PLASTIC, SOIC-8
AD8170AR-REEL	ADI	获取价格	250 MHz, 10 ns Switching Multiplexers w/Amplifier
AD8170AR-REEL	ROCHESTER	获取价格	2-CHANNEL, VIDEO MULTIPLEXER, PDSO8, PLASTIC, SOIC-8
AD8170ARZ	ROCHESTER	获取价格	2-CHANNEL, VIDEO MULTIPLEXER, PDSO8, PLASTIC, SOIC-8
AD8170ARZ	ADI	获取价格	250 MHz, 10 ns Switching Multiplexers w/Amplifier

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