MAX1247EVKIT Datasheet MAX1247EVKIT, MAX1247EVL11-QSOP, MAX1246EVKIT | P1-P3

_______________General Description

The MAX1247 evaluation kit (EV kit) is an assembled

and tested surface-mount PC board that demonstrates

the 3V, 12-bit, 4-channel MAX1247 analog-to-digital

converter.

The MAX1247 evaluation system (EV system) is a com-

plete, low-cost, 4-channel data-acquisition system con-

sisting of a MAX1247 EV kit and a Maxim 3V microcon-

troller (µC) module. IBM PC-compatible software pro-

vides a handy user interface to exercise the MAX1247’s

features. Source code is provided.

The MAX1246 EV kit and EV system are identical to the

MAX1247 EV kit and EV system except that the

MAX1247 is replaced by the MAX1246, which has an

internal 2.5V reference.

Order the EV system for comprehensive evaluation of

the MAX1247 or MAX1246 using a personal computer.

Order the EV kit if you have already purchased the 3V

µC module with a previous Maxim EV system, or for

custom use in other µC-based systems.

____________________________Features

♦ Proven PC Board Layout

♦ Complete Evaluation System

♦ Convenient On-Board Test Points

♦ Data-Logging Software

♦ Source Code Provided

♦ Fully Assembled and Tested

_______________Stand-Alone EV Kits

The MAX1246/MAX1247 EV kit provides a proven PC

board layout to facilitate evaluation of the MAX1246 or

MAX1247. It must be interfaced to appropriate timing

signals for proper operation. Refer to the MAX1246/

MAX1247 data sheet for timing requirements.

Systems that have 5V as well as 3V logic must provide

level translation for the MAX1246/MAX1247 DOUT and

SSTRB outputs. No level translation is necessary on the

digital interface inputs.

Evaluate: MAX1246/MAX1247

MAX1246/MAX1247 Evaluation Systems

________________________________________________________________

Maxim Integrated Products

19-1161; Rev 1; 6/97

QTY DESCRIPTION

C1, C7–C10 5

C2, C4, C6,

C11

C13 1

0.1µF ceramic surface-mount capacitor

(MAX1247 EV kit only)

C5 1

C12 1

0.047µF ceramic surface-mount capacitor

(MAX1247 EV kit only)

H1 1

J1 1

JU1, JU2,

JU5, JU6

R1–R4 4

1kΩ, 5% surface-mount resistors

10µF surface-mount tantalum capacitor

0.1µF ceramic surface-mount capacitors

0.01µF ceramic surface-mount capacitors

DESIGNATION

10-pin header

2 x 20 header

2-pin headers

MAX1246/MAX1247 EV Kits

___________________ Component List

______________Ordering Information

R5 1

100Ω, 5% surface-mount resistor

R6, R7 2

1MΩ, 5% surface-mount resistors

U1 1 MAX1247BCEE or MAX1246BCEE

QTY DESCRIPTION

1 MAX1246EVKIT-QSOP

68L11D µC MODULE (68L11D MODULE)

U2 1 MAX872CSA (MAX1247 EV kit only)

U3 1 MAX393CSE

U4 1 MAX495CSA

None 1 Printed circuit board

MAX1246EVL11

____________________Component List

PART TEMP. RANGE PIN-PACKAGE

MAX1246EVKIT-QSOP

0°C to +70°C Surface Mount

MAX1246EVL11-QSOP 0°C to +70°C Surface Mount

MAX1247EVKIT-QSOP

0°C to +70°C Surface Mount

MAX1247EVL11-QSOP 0°C to +70°C Surface Mount

C3 1 4.7µF surface-mount tantalum capacitor

QTY DESCRIPTION

1 MAX1247EVKIT-QSOP

68L11D µC MODULE (68L11D MODULE)

MAX1247EVL11

____________________Component List

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

For small orders, phone 408-737-7600 ext. 3468.

Evaluate: MAX1246/MAX1247

MAX1246/MAX1247 Evaluation Systems

2 _______________________________________________________________________________________

__________ EV Systems Quick Start

A single program, “MAX1247”, is used for both the

MAX1246 and the MAX1247 EV systems.

1) Copy the files from the distribution disk to your hard

disk or to blank floppy disks. The EV kit software

should be in its own directory. The necessary files

are in the distribution disk’s root directory, and the

source code is in the SOURCE subdirectory. The

SOURCE subdirectory is not required to operate

the EV kit.

2) Make sure that the jumpers are configured accord-

ing to Table 1. Table 2 lists the functions associated

with each jumper.

3) Carefully connect the boards by aligning the

EV kit’s 40-pin header with the µC module

’

40-pin connector. Gently press them together. The

two boards should be flush against each other.

4) Connect a 5V DC power source (16V max) to the

µC module at the terminal block located next to the

on/off switch, in the upper-right corner of the µC

module. Observe the polarity marked on the board.

5) Connect a cable from the computer’s serial port to

the µC module. If using a 9-pin serial port, use a

straight-through, 9-pin, female-to-male cable. If the

only available serial port uses a 25-pin connector, a

standard 25-pin to 9-pin adapter is required. The

EV kit software checks the modem status lines

(CTS, DSR, DCD) to confirm that the correct port

has been selected.

6) Start the software on the IBM PC by setting the cur-

rent directory to match the directory that contains

the Maxim programs, and then type the program

name “MAX1247” (for the MAX1246, type

“MAX1247 FASTPD”). Do not turn off or discon-

nect the µC module while the program is running; if

you do, you will have to restart the program.

7) The program will ask which port the µC module is

connected to. Press the space bar until the correct

PC serial port is highlighted, then press ENTER.

The program will be in terminal-emulation mode.

8) Turn on the power for the

C module. The

C mod-

ule will display its logon banner and test its RAM.

9) Download and run the RAM resident program on

the µC module by pressing ALT+L (i.e., hold down

the ALT key as you strike the L key). The program

will prompt you for the file name. Press the ENTER

key to download and run the file.

10) Press ALT+C to switch to the Control Panel screen

after the RAM resident program has been success-

fully downloaded.

11) Apply input signals to CH0–CH3 on the EV board.

Observe the readout on the screen. Table 3 lists the

commands that are available from the control panel

screen.

12) Before turning off power to the EV kit, exit the pro-

gram by pressing ALT+X.

Table 1. Default Jumper Settings

JUMPER

MAX1246

JUMPER

STATE

FUNCTION

JU1 Closed

Drive SHDN pin

JU2 Open See Table 2

JU3

Closed

(trace)

Bypass

supply-current

measurement

JU4

Closed

(trace)

Drive COM pin

JU5 Open See Table 2

JU6 Open

VREF not connected

to V

MAX1247

JUMPER

STATE

Closed

(trace)

Closed

(trace)

Closed

Open

JU2

Evaluate: MAX1246/MAX1247

MAX1246/MAX1247 Evaluation Systems

_______________________________________________________________________________________ 3

JUMPER STATE FUNCTION

Closed

Drive SHDN pin with pin 34 of the µC module.

JU1

Open

Force SHDN to float.

Closed REFADJ = V

. Disable the internal reference buffer (see JU5 and JU6 settings).

JU2

Open

REFADJ = Open. Enable the internal reference buffer. Refer to the MAX1246/MAX1247 data sheet for

additional information.

Closed Current-sense jumper (in series with V

)

JU3

Open

Closed Drive the COM pin with buffer U4.

JU4

Open COM disconnected from U4; COM must be driven directly by the user.

Closed VREF = MAX872 reference (MAX872 not supplied with MAX1246 EV kit).

JU5*

Open MAX872 disconnected from the MAX1247’s VREF input.

Closed VREF = V

JU6*

Open V

disconnected from the VREF input.

Do not operate the kit with JU3 open. Supply current may be measured by cutting JU3 open and

connecting a current meter across JU3.

Table 2. Jumper Settings

Detailed Description

________________________of Hardware

The MAX872 is a micropower 2.5V reference supplied

with the MAX1247 EV kit.

The MAX495 is a low-voltage Rail-to-Rail

op amp with

a 500kHz gain-bandwidth product. The MAX495

buffers the external COM input source.

The MAX393 analog switch allows the EV kit software to

route the MAX1246/MAX1247 COM pin to ground or to

the external COM input. In addition, the external COM

input can be routed to input channel 0. Typical systems

connect COM directly to analog ground or the analog

common voltage.

Changing the Reference Voltage

To supply a different external reference, open JU2 and

apply the reference voltage between VREF and GND or

J10 (REFADJ) and GND. Refer to the MAX1246/

MAX1247 data sheet for additional information.

Input Filtering

The EV kit has an RC filter on each input with a time

constant (τ) of 10µs. The MAX1246/MAX1247’s acquisi-

tion time with a 1MHz clock is 3µs.

The RC filter’s settling time may increase the acquisi-

tion time required for full accuracy when switching

input channels.

Detailed Description

________________________of Software

The software allows all features of the MAX1246/

MAX1247 to be exercised. Refer to Tables 3 and 4 for a

complete listing of available features.

The EV kit default software program (“KIT1247.L11”)

that is loaded into the 68L11D module operates at a

throughput rate of 6.41ksps. For faster throughput,

download the program “FAST1247.L11” at step 9 of the

Quick Start

section. This program has a throughput rate

of approximately 13ksps.

Listing 1 shows an example of interfacing the MAX1246/

MAX1247 to the 68HC11 processor.

*Note: Jumpers JU5 and JU6 should not both be closed.

Rail-to-Rail is a registered trademark of Nippon Motorola Ltd.

P1-P3 P4-P6 P7-P8

MAX1247EVKIT

Mfr. #:

Buy MAX1247EVKIT

Manufacturer:

Maxim Integrated

Description:

Data Conversion IC Development Tools MAX1247 Eval Kit

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MAX1247EVKIT

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