MAX9601EVKIT [MAXIM]

Adjustable Hysteresis;


型号：	MAX9601EVKIT
厂家：	MAXIM INTEGRATED PRODUCTS
描述：	Adjustable Hysteresis
文件：	总6页 (文件大小：2134K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

MAX9601 Evaluation Kit

Evaluates: MAX9601

General Description

Features

S -2.2V to +3V Input Range with +5V/-5.2V Supplies

S -1.2V to +4V Input Range with +6V/-4.2V Supplies

The MAX9601 evaluation kit (EV kit) is a fully assem-

bled and tested surface-mount PCB that evaluates the

MAX9601 dual-channel PECL output comparators. It

can be used to evaluate the MAX9601’s performance in

tracking high-fidelity narrow pulses, as well as conform

its low-propagation delay and delay dispersion. The

differential input stage accepts a wide range of signals

in the common-mode range from (VEE + 3V) to (VCC -

2V). The outputs are complementary digital signals with

external components necessary to observe the PECL

serial-data output on a 50I input oscilloscope. The

board also provides layout options that allow the output

termination to be modified easily for alternate output

terminations, such as +5V PECL and high impedance

or AC-coupled level translation. The EV kit features test

points to control the complementary latch-enable control

inputs. The EV kit also provides resistor footprints to

evaluate the MAX9601’s adjustable hysteresis feature.

S SMA Connectors to Access Differential Inputs and

Outputs

S Differential PECL Outputs

S Latch Enable

S Adjustable Hysteresis

S Output Terminated for Interfacing with a 50I

Oscilloscope Input

S Allows Alternate Output Terminations

S Fully Assembled and Tested

Ordering Information

PART

TYPE

MAX9601EVKIT+

EV Kit

+Denotes lead(Pb)-free and RoHS compliant.

Component List

DESIGNATION

QTY

DESCRIPTION

DESIGNATION

QTY

DESCRIPTION

C1, C13,

C17, C22

LEA, LEA,

LEB, LEB

0I Q5% resistors (0603)

Test points

R1, R4,

R10, R13

10FF Q10%, 10V X7R ceramic

capacitors (1206)

Murata GRM31CR71A106K

TDK C3216X7R1A106K

4.53I Q1% resistors (0603)

82.5I Q1% resistors (0603)

C5, C8,

C11, C20

R2, R3,

R11, R12

R6, R8, R9,

R15, R17, R18

0.1FF Q10%, 50V X7R ceramic

capacitors (0603)

Murata GRM188R71H104K

TDK C1608X7R1H104K

49.9I Q1% resistors (0603)

16.5kI Q1% resistors (0603)

90.9I Q1% resistors (0603)

C6, C9,

C12, C19

R7, R16

R19–R22,

R27–R30

0.01FF Q10%, 50V X7R ceramic

capacitors (0603)

Murata GRM188R71H103K

TDK C1608X7R1H103K

C7, C10,

C18, C21

Dual PECL high-speed

comparator (20 TSSOP)

Maxim MAX9601EUP+

—

PCB: MAX9601 EVALUATION

KIT+

INA+, INA-,

INB+, INB-, QA,

QA, QB, QB

Edge-mount receptacle SMA

connectors

For pricing, delivery, and ordering information, please contact Maxim Direct

at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.

19-5092; Rev 0; 12/09

MAX9601 Evaluation Kit

Evaluates: MAX9601

Component Suppliers

SUPPLIER

Murata Electronics North America, Inc.

TDK Corp.

PHONE

WEBSITE

www.murata-northamerica.com

www.component.tdk.com

770-436-1300

847-803-6100

Note: Indicate that you are using the MAX9601 when contacting these component suppliers.

12) Monitor and verify outputs QA and QA with the oscil-

Quick Start

Recommended Equipment

loscope. The oscilloscope must be configured for

50I input termination.

•ꢀ DC power supplies

13) Monitor and verify outputs QB and QB with the oscil-

loscope. The oscilloscope must be configured for

50I input termination.

+5V, 100mA positive power supply (VCC)

-5.2V, 100mA negative power supply (VEE)

+5V, 100mA logic power supply (VCCO_)

+3V 1mA latch enable power supply (LE_)

•ꢀ RF signal generator (e.g., MAX8685A)

•ꢀ High-bandwidth oscilloscope

Detailed Description of Hardware

Supply Voltages

The MAX9601 EV kit operates from either standard

supply levels of -5.2V/+5V or shifted levels of -4.2V/+6V.

Connect the positive and negative supply voltages to

the VCC and VEE pads, respectively. The EV kit also

requires an output driver positive supply for each chan-

nel. Connect the logic supply voltages to the VCCOA

and VCCOB pads.

Procedure

The MAX9601 EV kit is fully assembled and test-

ed. Follow the steps below to verify board operation.

Caution: Do not turn on power supplies until all con-

nections are completed.

Inputs

The EV kit provides INA+, INA-, INB+, and INB- SMA

connectors to access the MAX9601’s differential inputs.

The differential input stage accepts a wide range of

signals in the common-mode range from (VEE + 3V)

to (VCC - 2V) with a CMRR of 70dB (typ). All the input

traces are symmetrical and have 50I of characteristic

impedance. Each input trace has a 49.9I termination

resistor to avoid signal reflections.

1) Set the VCC power supply to +5V. Disable VCC.

2) Connect the negative terminal of the VCC power

supply to the GND pad. Connect the positive termi-

nal of the VCC power supply to the VCC pad.

3) Set the VEE power supply to -5.2V. Disable VEE.

4) Connect the negative terminal of the VEE power

supply to the VEE pad. Connect the positive terminal

of the VEE power supply to the GND pad.

5) Set the VCCO_ power supply to +5V. Disable

VCCO_.

6) Connect the negative terminal of the VCCO_ power

supply to the GND pad. Connect the positive termi-

nal of the VCCO_ power supply to the VCCOA pad.

Short the VCCOA pad to the VCCOB pad.

Outputs

The EV kit provides QA, QA, QB, and QB SMA connec-

tors to access the MAX9601’s comparator outputs. All

the output traces are symmetrical and have 50Iof char-

acteristic impedance. The output signals are referenced

to the logic supply voltage VCCO_ and have the external

components necessary to observe the PECL output. See

the Output Termination section for more details.

7) Set the LE_ power supply to +3V. Disable LE_.

8) Connect the negative terminal of the LE_ power

supply to the GND pad. Connect the positive termi-

nal of the LE_ power supply to the LEA pad. Short

the LEA pad to the LEB pad.

Hysteresis

Hysteresis can be introduced to prevent oscillation or

multiple transitions due to noise on low-slew input sig-

nals. The EV kit features resistors R7 and R16 to program

the current-controlled hysteresis. Refer to the Hysteresis

(MAX9600/MAX9601) section in the MAX9601 IC data

sheet for a more detailed description.

9) Set the signal generator to produce an output sine-

wave signal of 100mV

at a frequency of 250MHz.

P-P

Disable the signal generator.

10) Connect the signal generator to the edge-mount

SMA connector marked INA+.

11) Enable all power supplies. Enable the signal

generator.

Maxim Integrated

MAX9601 Evaluation Kit

Evaluates: MAX9601

Alternative PECL Output Termination

Alternative PECL output termination methods can be

used for different logic interfaces as long as they pro-

vide a DC Thevenin equivalent of 50I to VCC - 2V. For

example, to interface QA with a PECL or high-impedance

input, short resistors R1 and R19, and replace R27 with

a 124I resistor. To interface QA with a PECL input test

equipment, which is internally terminated with 50I to

VCCO_ - 2V, take the following steps:

Latch Enable

The complementary latch-enable control permits track-

ing, track-hold, or sample-hold modes of operation.

The latch enables can be driven with PECL logic. See

Table 1 for the latch-enable truth table. By default, the

EV kit is configured to operate in compare mode. LEA

and LEB are connected to the VCCOA and VCCOB pads

through resistors R6 and R15 (LEA and LEB signals

need to be provided externally).

1) Remove resistors R2 and R27.

2) Short resistors R1 and R19.

Output Termination

DC-Coupled Output to Oscilloscope

The EV kit’s default output termination network provides

the output with a Thevenin equivalent of 50I to VCCO_

- 2V, when connected to a 50I load to ground. Hence,

the outputs can be conveniently connected directly to

an oscilloscope’s 50I input. The termination network

provides a 4x output signal attenuation. If only one of

the serial-data outputs is connected to an oscilloscope,

ensure that the other is still properly terminated. Keep

in mind that the resistor networks at each output pro-

vide proper termination only when they are terminated

through 50I to ground.

3) Place a bias-T in series between the MAX9601 and

the test equipment. Connect the bias-T’s RF and DC

terminals to the QA output and the RF terminal to

the test equipment’s PECL input. Then connect the

DC terminal to a VCCO_ - 2V termination voltage

through a 50I resistor.

Layout

The EV kit uses a two-layer board for simplicity. However,

special layout precautions have been taken due to the

large gain-bandwidth characteristics of the MAX9601.

The 0.01FF power-supply decoupling capacitors are

mounted as close as possible to the power-supply input

pins. The inductance of the return path is reduced by

flooding the ground plane with multiple vias. Multiple

ground vias are also present besides the decoupling

capacitors and signal traces to shorten the ground

return path and maximize isolation. The lead lengths

on the inputs and outputs are minimized to avoid

unwanted parasitic feedback around the comparators.

Microstrip layout and terminations are used at both the

inputs, as well as the outputs, to reduce signal reflec-

tions. Layer 2 is a continuous ground plane with no

signal or power traces. Impedance discontinuities have

been minimized by routing all the signal traces on the

top layer only, with no interconnecting vias or sharp cor-

ners. Edge-mount SMA connectors are used to reduce

the capacitive discontinuity and maximize frequency

response. The symmetric layout also minimizes the skew

due to the traces.

AC-Coupled Output to Oscilloscope

The output can also be AC-coupled to the next stage.

While AC-coupling the output, remember that the IC

has an open-emitter output. Hence the output must

have a DC path provided with suitable external pull-

down resistors. Also, the resultant current sourced by

the output stage must not exceed the output current

capability of the part. For example, to AC-couple the QA

output to a 50I input oscilloscope, short resistor R19.

Replace resistor R2 with 125Iand R27 with 187.5I. This

provides a DC Thevenin equivalent of 75Ito VCCO - 2V.

Now replace resistor R1 with 49.9Iresistor and populate

capacitor C1 with a suitable low-loss, high-frequency

capacitor. With good coupling, the AC load adds an

additional 8mA of output current only, since capacitor C1

blocks the DC component of the PECL output.

Table 1. Latch-Enable Truth Table

Test Setup

Note that a test setup optimized for high-speed mea-

surement is essential to observe the true performance of

the MAX9601 device. Use matched SMA cables for the

differential inputs and outputs. Also, account for the time

delay and skew of the test setup. For accurate measure-

ment of the device’s rise and fall times, an oscilloscope

with a bandwidth several times larger than the maximum

signal frequency must be used.

LATCH-ENABLE INPUT

OPERATION

LE_

Compare mode (output follows

input state)

Latch mode (output latches to

last known output state)

Invalid condition (output is in

unknown state)

Maxim Integrated

MAX9601 Evaluation Kit

Evaluates: MAX9601

Figure 1. MAX9601 EV Kit Schematic

Maxim Integrated

MAX9601 Evaluation Kit

Evaluates: MAX9601

1.0”

Figure 2. MAX9601 EV Kit Component Placement Guide—

Component Side

Figure 3. MAX9601 EV Kit Component PCB Layout—

Component Side

1.0”

Figure 4. MAX9601 EV Kit PCB Layout—Solder Side

Maxim Integrated

MAX9601 Evaluation Kit

Evaluates: MAX9601

Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent

licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and

max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.

Maxim Integrated 160 Rio Robles, San Jose, CA 95134 USA 1-408-601-1000

2009 Maxim Integrated Products, Inc.

Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.

MAX9601EVKIT [MAXIM]

相关型号：

MAX9601EVKIT+

MAX9602

MAX9602EUG

MAX9602EUG+

MAX9602EUG-T

MAX961

MAX9610

MAX9610FELT+T

MAX9610FEXK+

MAX9610FEXK+T

MAX9610HELT+T

MAX9610HEXK+