Datasheet > ADCMP582_15

ADCMP582_15

更新时间： 2024-02-16 13:07:31

品牌	Logo	应用领域
亚德诺 - ADI		/
页数	文件大小	规格书
16页	430K
描述
Ultrafast SiGe Voltage Comparators

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数据手册

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ADCMP582_15 数据手册

ADCMP580/ADCMP581/ADCMP582

APPLICATION INFORMATION

GND

POWER/GROUND LAYOUT AND BYPASSING

The ADCMP58x family of comparators is designed for very

high speed applications. Consequently, high speed design

techniques must be used to achieve the specified performance.

It is critically important to use low impedance supply planes,

particularly for the negative supply (ꢀ_EE), the output supply

plane (ꢀ_CCO), and the ground plane (GND). Individual supply

planes are recommended as part of a multilayer board. Provid-

ing the lowest inductance return path for the switching currents

ensures the best possible performance in the target application.

50Ω

16mA

It is also important to adequately bypass the input and output

supplies. A 1 μF electrolytic bypass capacitor should be placed

within several inches of each power supply pin to ground. In

addition, multiple high quality 0.1 μF bypass capacitors should

be placed as close as possible to each of the ꢀ_EE, ꢀ_CCI, and ꢀ_CCO

supply pins and should be connected to the GND plane with

redundant vias. High frequency bypass capacitors should be

carefully selected for minimum inductance and ESR. Parasitic

layout inductance should be strictly avoided to maximize the

effectiveness of the bypass at high frequencies.

Figure 24. Simplified Schematic Diagram of the ADCMP580 CML Output Stage

GND/V

CCO

ADCMP58x FAMILY OF OUTPUT STAGES

Specified propagation delay dispersion performance is achieved

by using proper transmission line terminations. The outputs of

the ADCMP580 family comparators are designed to directly

drive 400 mꢀ into 50 Ω cable or microstrip/stripline transmis-

sion lines terminated with 50 Ω referenced to the proper return.

The CML output stage for the ADCMP580 is shown in the

simplified schematic diagram in Figure 24. Each output is

back-terminated with 50 Ω for best transmission line matching.

The outputs of the ADCMP581/ADCMP582 are illustrated in

Figure 25; they should be terminated to −2 ꢀ for ECL outputs of

ADCMP581 and ꢀ_CCO− 2 ꢀ for PECL outputs of ADCMP582.

As an alternative, Thevenin equivalent termination networks

can also be used. If these high speed signals must be routed

more than a centimeter, either microstrip or stripline techniques

are required to ensure proper transition times and to prevent

excessive output ringing and pulse width-dependent propagation

delay dispersion.

Figure 25. Simplified Schematic Diagram of the

ADCMP581/ADCMP582 ECL/PECL Output Stage

USING/DISABLING THE LATCH FEATURE

The latch inputs (LE/ ) are active low for latch mode and are

internally terminated with 50 Ω resistors to the ꢀ_TTpin. When

using the ADCMP580, ꢀ_TTshould be connected to ground.

When using the ADCMP581, ꢀ_TTshould be connected to −2 ꢀ.

When using the ADCMP582, ꢀ_TTshould be connected externally

to ꢀ_CCO− 2 ꢀ, preferably with its own low inductance plane.

When using the ADCMP580, the latch function can be disabled

by connecting the

pin to ꢀ_EEwith an external pull-down

resistor and by leaving the LE pin to ground. To prevent excessive

power dissipation, the resistor should be 1 kΩ for the ADCMP580.

When using the ADCMP581 comparators, the latch can be

disabled by connecting the

pin to ꢀ_EEwith an external 750 Ω

resistor and leaving the LE pin connected to −2 ꢀ. The idea is to

create an approximate 0.5 ꢀ offset using the internal resistor as

half of the voltage divider. The ꢀ_TTpin should be connected as

recommended.

Rev. A | Page 11 of 16

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

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与ADCMP582_15相关器件

型号	品牌	获取价格	描述	数据表
ADCMP582BCP	ADI	获取价格	Ultrafast SiGe Voltage Comparator
ADCMP582BCP-R2	ADI	获取价格	Ultrafast SiGe Voltage Comparators
ADCMP582BCP-RL7	ADI	获取价格	Ultrafast SiGe Voltage Comparators
ADCMP582BCP-WP	ADI	获取价格	Ultrafast SiGe Voltage Comparators
ADCMP582BCPZ-R2	ADI	获取价格	Ultrafast SiGe Voltage Comparators
ADCMP582BCPZ-RL7	ADI	获取价格	Ultrafast SiGe Voltage Comparators
ADCMP582BCPZ-WP	ADI	获取价格	Ultrafast SiGe Voltage Comparators
ADCMP600	ADI	获取价格	Rail-to-Rail, Very Fast, 2.5 V to 5.5 V, Single-Supply TTL/CMOS Comparators
ADCMP600_11	ADI	获取价格	Rail-to-Rail, Very Fast, 2.5 V to 5.5 V
ADCMP600_15	ADI	获取价格	Rail-to-Rail, Very Fast, 2.5 V to 5.5 V,

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