MAX101AEVKIT Datasheet MAX101AEVKIT | P1-P3

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800

_______________General Description

The MAX101A evaluation kit (EV kit) was developed to

assist in the initial evaluation of the MAX101A high-

speed analog-to-digital converters (ADCs). The EV kit is

a two-board set comprised of a main board and a ter-

mination board.

The main board contains all the circuitry needed to

evaluate the initial performance of this flash converter,

which combines high-speed analog and digital circuitry

and requires special attention to circuit layout. In con-

junction with the MAX101A, the main board allows digi-

tizing of analog signals at up to 500Msps. It has provi-

sions for an external clock source, which is supplied

through an SMA connector. The analog inputs to the

converter are through two SMA connectors (AIN+ and

AIN-). There are 16 data outputs (two 8-bit words) plus

the data clock output.

A separate termination board with 50Ω ECL pull-down

resistors is provided with the kit and is connected to the

main board with a 3x32 pin EURO-card connector. It

provides access to the converter output data, as well

as proper ECL termination. The termination board also

has two ranks of square pins, each providing eight data

outputs, plus data clock outputs. Either AData or BData

can be observed with a high-speed logic analyzer.

Standard power supplies of +5V and -5.2V are needed

to operate the MAX101A main board. Power can be

supplied through the 3x32 EURO-card connector or

through the pads on the edge of the board. Nominal

power dissipation for both boards is 17W. The board

set comes fully assembled and tested, with the

MAX101A installed.

The MAX101A EV kit comes with a MAX101A installed

on the board, but it can also be used to evaluate the

MAX101. Refer to instructions for setting references

and input conditions for the appropriate device version

throughout this document.

____________________________Features

♦ 7.0 Effective Bits at 250MHz

♦ On-Board Reference Generator/Buffer

♦ 50Ω Input through SMA Coaxial Connectors

♦ Dual Differential-Output Data Paths

♦ ±270mV Input Signal Range (MAX101)

±250mV Input Signal Range (MAX101A)

♦ Buffered Differential 100k ECL Outputs

♦ 3x32 Pin EURO-Card Connector

Evaluates: MAX101/MAX101A

MAX101A Evaluation Kit

________________________________________________________________

Maxim Integrated Products

19-0342; Rev 1; 7/96

PART TEMP. RANGE BOARD TYPE

MAX101AEVKIT-CFR 0°C to +70°C Surface Mount

______________Ordering Information

____________________Component List

DESIGNATION QTY DESCRIPTION

C1, C2, C4, C6, C7,

C9, C10, C12, C14,

C15, C18, C20, C23,

C26, C27, C29, C31,

C32, C34, C36,

C38, C40, C42

23 0.01µF capacitors

C3, C5, C11, C13 4 0.22µF capacitors

C8, C16, C30, C33,

C35, C37, C39,

C41, C43

9 100pF capacitors

C17, C21, C24 3 0.1µF capacitors

C19, C22, C25 3

10µF capacitors,

AVX “D” tantalum

D1–D4 4

100mA Schottky diodes,

Central Semiconductor

CMPSH-3

DIV 10 1 3-pin jumper block

J1, J2, J3 3 Female SMA connectors

J5 1 96-pin EURO-style plug

L1, L2 2 Ferrite beads

R1, R12 2 180Ω, 1% resistors

R2, R13, R23 3 121Ω, 1% resistors

R3, R4, R14, R15 4 100Ω trim pots

R5, R16, R38, R39 4 51Ω, 5% resistors

Component List continued on next page.

Evaluates: MAX101/MAX101A

MAX101A Evaluation Kit

2 _______________________________________________________________________________________

_________________________Quick Start

1) Plug the termination board into the 96-pin connec-

tor of the MAX101A main board.

2) Use a fan to provide at least 200 lineal feet/min air-

flow to the heatsink of the MAX101A.

3) Connect the power supplies. The power-supply

input pads are in the lower right-hand corner of the

MAX101A main board. The board requires a 20W

power supply that provides +5V and -5.2V with a

common ground.

4) Turn on the -5.2V power supply first, followed by

the +5V power supply. The -5.2V power supply

should be the first supply turned on and the last

supply turned off.

5) Connect a low-phase-jitter RF source with a level

range of -4dBm to +10dBm to the clock input.

6) Connect a test signal to the analog inputs. Use

IN+ and IN- if the signal is differential, or IN+ if the

signal is single-ended (±270mV (MAX101),

±250mV (MAX101A) differential; see the MAX101

or MAX101A data sheet).

7) Observe the digitized results on the termination

board pins by using a logic analyzer, such as the

HP16500 series or an equivalent data-acquisition

system. The outputs are 100k ECL compatible.

_______________Detailed Description

Board Set

The MAX101A EV kit is a two-board set. The main board

contains ECL-interface circuitry and the MAX101A ADC.

The termination board provides high-speed signal termi-

nation and access to the digital data. For further signal

processing, the main board can be plugged into a larger

system board via the provided EURO-card connector.

Clock Input

The external clock input is capacitively coupled to an on-

board bias network. Take care to ensure that the pulse

width is within the specified requirements: clock input

levels should be -4dBm to +10dBm, and clock frequency

can range from 250MHz to 500MHz. Figure 1 in the

MAX101A data sheet shows the necessary timing

requirements for the clock input, as well as the

expected output clock waveforms. The clock input

should be driven by a low-jitter RF signal source. Refer

to Figures 1, 2, and 3 of the MAX101A data sheet for

more information.

Analog Input

Analog input to the MAX101A is made through one or

both of the two SMA coaxial connectors provided (AIN+

and AIN- inputs). Each input is a direct connection to the

ADC, with internal 50Ω terminations provided by the

MAX101A.

Outputs

The MAX101A main board has two 8-bit-wide digital

outputs that are 100k ECL compatible. Each data out-

put is buffered by 100E116 line receivers. There is also

a data clock output (DCLK) provided for timing. All 17

outputs provided to the EURO-card connector are dif-

ferential and unterminated.

The termination board provides a termination for each

data line, through 50Ω to -2V.

ADC Reference Resistor String

An on-board reference supply and op-amp circuit drive

the ADC reference resistor string. The reference sup-

plies can be adjusted using the four potentiometers on

the board (see the

Calibration Procedure

). It is impor-

tant to ensure that a reverse bias condition never occurs

on the reference inputs. Schottky diode clamps on the

reference amp outputs help protect the MAX101A.

DIV 10

The jumper DIV 10 selects the operating mode of the

MAX101A, which can output data either at full speed or

at 1/10 the clock rate. This feature is valuable during

initial testing. DIV 10 is usually left open for normal (full-

DESIGNATION QTY DESCRIPTION

_______Component List (continued)

R6, R7, R17, R18 4 20Ω, 5% resistors

R8, R9, R19, R20 4 12.1kΩ, 1% resistors

R10, R11, R21, R22 4 27.4Ω, 1% resistors

R24, R34, R36 3 82.5Ω, 1% resistors

R25 1 1kΩ, 1% resistor

R26 1 2kΩ trim pot

R27 1 3.16kΩ, 1% resistor

R28, R29, R40–R55 18 100Ω, 5% resistors

R35, R37 2 221Ω, 1% resistors

U1 1 Maxim MAX101ACFR

U2, U4 2

Maxim MAX412CPA high-

speed dual op amps

U3, U5 2

Maxim MX580KH 2.5V

references

U6 1

LM337T negative voltage

regulator

U8, U21–U24 5

MC100E116 quintuple line

receivers

speed) operation.

Power Supplies

The following supplies are required for normal opera-

tion of the main board:

= +5V at 0.8A

and V

= -5.2V at 2.5A

These voltages should be supplied to the connector pins

for V

, V

, and V

, respectively. V

and V

are

connected on the board with a ferrite bead. If system

noise must be reduced, you may remove this bead and

then provide the analog supply, V

, separately from the

digital supply, V

. The -5.2V power supply should be the

first supply turned on and the last supply turned off.

Board Layout

The MAX101A requires proper PC board layout for

device operation. This section explains the layout

requirements and demonstrates how the EV kit

achieves these goals.

Use power and ground planes to deliver power to the

device, keeping the digital planes separate from the

analog planes. The EV kit uses layers 3, 4, and 5 for

power and ground planes. Tie digital ground and ana-

log ground to a single point, as close to the power sup-

ply as possible. On the EV kit, digital ground ties to ana-

log ground at ferrite bead L1. Likewise, tie digital power

) and analog power (V

) to a single point, as close

to the power supply as possible. On the EV kit, digital

power ties to analog -5.2V power at ferrite bead L2.

Use transmission lines for the analog input, clocks, and

high-speed digital outputs. The MAX101A EV kit uses

microstrip lines of two different impedances. The

MAX101A data outputs drive differential line drivers

through 100Ω microstrip lines. The 50Ω microstrip lines

occupy layers 1 and 2. The 100Ω microstrip lines occu-

py layers 1 and 3, with layer 2 void. The kit uses FR4

epoxy dielectric material, whose relative dielectric con-

stant is between 4.1 and 4.9. The nominal design is

0.0014 inch (0.0355mm) foil thickness for each copper

layer, and 0.011 inch (0.28mm) dielectric thickness

between layers. The 50Ω microstrip lines have a signal

trace width of 0.020 inch (0.50mm), and the 100Ω

microstrip lines have a signal trace width of 0.010 inch

(0.25mm). Refer to Motorola’s MECL or ECLinPS data

book for an introduction to interconnect design.

Due to the high-speed nature of this part, the propaga-

tion delay of the PC board traces becomes a significant

design consideration. For the EV kit design, the propa-

gation delay is approximately 145ps per inch

(5.7ps/mm). For best results, try to match the lengths of

the data traces to within 0.5 inch (12mm). The clock

signal must be routed on one layer only, without using

any through-hole vias. The MAX101A EV kit is a con-

trolled impedance board (50Ω and 100Ω) and has a

total board thickness of 0.062 inches (1.57mm) using

six copper layers (see Figure 1, the Layer Profile).

Evaluating the MAX101

The MAX101A EV kit also can be used to evaluate

the MAX101.

To use the MAX101, refer to specific instructions in the

Quick Start, Applications Information,

and

Calibration

Procedure

sections.

Evaluates: MAX101/MAX101A

MAX101A Evaluation Kit

_______________________________________________________________________________________ 3

Copper Layer 1

Copper thickness = 0.0007" (

⁄

copper) (microstrip signals)

Epoxy FR4 Dielectric layer thickness = 0.011"

Copper Layer 2