AD8612ARU-REEL

更新时间： 2024-02-28 02:38:01

品牌	Logo	应用领域
亚德诺 - ADI		比较器
页数	文件大小	规格书
20页	305K
描述
Ultrafast, 4 ns Single-Supply Comparators

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技术参数
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替代型号

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AD8612ARU-REEL 技术参数

是否无铅：	不含铅	是否Rohs认证：	符合
生命周期：	Active	零件包装代码：	TSSOP
包装说明：	TSSOP-14	针数：	14
Reach Compliance Code：	unknown	风险等级：	5.76
Is Samacsys：	N	放大器类型：	COMPARATOR
最大平均偏置电流 (IIB)：	4 µA	最大输入失调电压：	7000 µV
JESD-30 代码：	R-PDSO-G14	JESD-609代码：	e3
长度：	5 mm	湿度敏感等级：	1
负供电电压上限：		标称负供电电压 (Vsup)：
功能数量：	1	端子数量：	14
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：	TSSOP
封装形状：	RECTANGULAR	封装形式：	SMALL OUTLINE, THIN PROFILE, SHRINK PITCH
峰值回流温度（摄氏度）：	260	认证状态：	COMMERCIAL
标称响应时间：	4.5 ns	座面最大高度：	1.2 mm
子类别：	Comparator	供电电压上限：	7 V
标称供电电压 (Vsup)：	3 V	表面贴装：	YES
温度等级：	INDUSTRIAL	端子面层：	MATTE TIN
端子形式：	GULL WING	端子节距：	0.65 mm
端子位置：	DUAL	处于峰值回流温度下的最长时间：	40
宽度：	4.4 mm	Base Number Matches：	1

AD8612ARU-REEL 数据手册

AD8611/AD8612

APPLICATIONS

OPTIMIZING HIGH SPEED PERFORMANCE

two voltages at the inputs to the comparator. The LT1016 has an

input voltage range from 1.25 V above the negative supply to

1.5 V below the positive supply. The AD8611 input voltage

range extends down to the negative supply voltage to within 2 V

of V+. If the input common-mode voltage is exceeded, input

signals should be shifted or attenuated to bring them into range,

keeping in mind the note about source resistance in the

Optimizing High Speed Performance section.

As with any high speed comparator or amplifier, proper design

and layout of the AD8611/AD8612 should be used to ensure

optimal performance. Excess stray capacitance or improper

grounding can limit the maximum performance of high speed

circuitry.

Minimizing resistance from the source to the comparator’s

input is necessary to minimize the propagation delay of the

circuit. Source resistance in combination with the equivalent

input capacitance of the AD8611/AD8612 creates an R-C filter

that could cause a lagged voltage rise at the input to the

comparator. The input capacitance of the AD8611/AD8612 in

combination with stray capacitance from an input pin to

ground results in several picofarads of equivalent capacitance.

Using a surface-mount package and a minimum of input trace

length, this capacitance is typically around 3 pF to 5 pF. A

combination of 3 kΩ source resistance and 3 pF of input

capacitance yields a time constant of 9 ns, which is slower than

the 4 ns propagation delay of the AD8611/AD8612. Source

impedances should be less than 1 kΩ for best performance.

For example, an AD8611 powered from a 5 V single supply has

its noninverting input connected to a 1 V peak-to-peak, high

frequency signal centered around 2.3 V and its inverting input

connected to a fixed 2.5 V reference voltage. The worst-case

input common-mode voltage to the AD8611 is 2.65 V. This is

well below the 3.0 V input common-mode voltage range to the

comparator. Note that signals much greater than 3.0 V result in

increased input currents and may cause the comparator to

operate more slowly.

The input bias current to the AD8611 is 7 μA maximum over

temperature (−40°C to +85°C). This is identical to the

maximum input bias current for the LT1394, and half of the

maximum I_Bfor the LT1016. Input bias currents to the AD8611

and LT1394 flow out from the comparator’s inputs, as opposed

to the LT1016 whose input bias current flows into its inputs.

Using low value resistors around the comparator and low

impedance sources will minimize any potential voltage shifts

due to bias currents.

Another important consideration is the proper use of power-

supply-bypass capacitors around the comparator. A 1 μF bypass

capacitor should be placed within 0.5 inches of the device

between each power supply pin and ground. Another 10 nF

ceramic capacitor should be placed as close as possible to the

device in parallel with the 1 μF bypass capacitor. The 1 μF

capacitor reduces any potential voltage ripples from the power

supply, and the 10 nF capacitor acts as a charge reservoir for the

comparator during high frequency switching.

The AD8611 is able to swing within 200 mV of ground and

within 1.5 V of positive supply voltage. This is slightly more

output voltage swing than the LT1016. The AD8611 also uses

less current than the LT1016—5 mA as compared to 25 mA of

typical supply current.

A continuous ground plane on the PC board is also

recommended to maximize circuit performance. A ground

plane can be created by using a continuous conductive plane

over the surface of the circuit board, only allowing breaks in the

plane for necessary traces and vias. The ground plane provides a

low inductive current return path for the power supply, thus

eliminating any potential differences at various ground points

throughout the circuit board caused from ground bounce. A

proper ground plane can also minimize the effects of stray

capacitance on the circuit board.

The AD8611 has a typical propagation delay of 4 ns, compared

with the LT1394 and LT1016, whose propagation delays are

typically 7 ns and 10 ns, respectively.

MAXIMUM INPUT FREQUENCY AND OVERDRIVE

The AD8611 can accurately compare input signals up to

100 MHz with less than 10 mV of overdrive. The level of

overdrive required increases with ambient temperature, with up

to 50 mV of overdrive recommended for a 100 MHz input

signal and an ambient temperature of +85°C.

UPGRADING THE LT1394 AND LT1016

The AD8611 single comparator is pin-for-pin compatible with

the LT1394 and LT1016 and offers an improvement in propagation

delay over both comparators. These devices can easily be replaced

with the higher performance AD8611; however, there are differ-

ences, so it is useful to ensure that the system still operates properly.

It is not recommend to use an input signal with a fundamental

frequency above 100 MHz because the AD8611 could draw up

to 20 mA of supply current and the outputs may not settle to a

definite state. The device returns to its specified performance

once the fundamental input frequency returns to below 100 MHz.

The five major differences between the AD8611 and the LT1016

include input voltage range, input bias currents, propagation

delay, output voltage swing, and power consumption. Input

common-mode voltage is found by taking the average of the

Rev. A | Page 10 of 20

1...7 8 91011 12 13...20

中文翻译

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AD8612ARU-REEL 替代型号

型号	品牌	替代类型	描述	数据表
AD8612ARUZ	ADI	完全替代	Ultrafast, 4 ns Single-Supply Comparators
AD8612ARUZ-REEL	ADI	类似代替	Ultrafast, 4 ns Single-Supply Comparators

与AD8612ARU-REEL相关器件

型号	品牌	获取价格	描述	数据表
AD8612ARUZ	ADI	获取价格	Ultrafast, 4 ns Single-Supply Comparators
AD8612ARUZ-REEL	ADI	获取价格	Ultrafast, 4 ns Single-Supply Comparators
AD8613	ADI	获取价格	Low Cost Micropower, Low Noise CMOS Rail-to- Rail, Input/Output Operational Amplifiers
AD8613_10	ADI	获取价格	Low Cost Micropower, Low Noise CMOS Rail-to-Rail, Input/Output Operational Amplifiers
AD8613_15	ADI	获取价格	Low Cost Micropower, Low Noise CMOS
AD8613_16	ADI	获取价格	Low Cost Micropower, Low Noise CMOS Rail-to-Rail, Input/Output Operational Amplifiers
AD8613AKSZ	UMW	获取价格	低功耗运算放大器
AD8613AKSZ-R2	ADI	获取价格	Low Cost Micropower, Low Noise CMOS Rail-to- Rail, Input/Output Operational Amplifiers
AD8613AKSZ-REEL	ADI	获取价格	Low Cost Micropower, Low Noise CMOS Rail-to- Rail, Input/Output Operational Amplifiers
AD8613AKSZ-REEL7	ADI	获取价格	Low Cost Micropower, Low Noise CMOS Rail-to- Rail, Input/Output Operational Amplifiers

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