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Evaluate: MAX1169

Detailed Description

of Software

The main window of the evaluation software is shown in

Figure 1. This window displays the voltage and code of

the analog input signal AIN. The software supports both

manual read or automatic read operations. The I

C-

compatible serial-clock (SCL) frequency is selectable:

HS mode (1.7MHz), fast mode (400kHz), or standard

mode (100kHz). In HS-mode I

C-compatible systems,

the communication and arbitration are always done in

either fast mode or standard mode. Only data can be

transmitted or received at HS-mode speeds. The soft-

ware expects the use of a 4.096V reference on execu-

tion; however, this value can be changed in the soft-

ware to accommodate a different reference value.

Table 1 describes the controls in the main window of

the evaluation software.

External Reference

To disable the MAX1169’s internal +4.096V (typ) refer-

ence, select external reference mode with a shunt on

JU4. Apply the new external reference voltage between

the REF and GND pads on the MAX1169 EV kit board.

After measuring the external reference voltage, enter it

into the V

REF

field of the software (without the volt unit)

and press the Set V

REF

button.

Detailed Description

of Hardware

MAX1169 EV System

The MAX1169 EV system is a complete 16-bit data-

acquisition system consisting of a MAX1169 EV kit, a

68HC16 µC module, USBTO232, and an HS I

C-com-

patible module.

The complete MAX1169 EV system is used to evaluate

the MAX1169 16-bit, I

C-compatible, analog-to-digital

converter (ADC). See the

Quick Start

section for setup

and operating instructions.

68HC16 Module

The 68HC16 µC module utilizes Motorola’s

MC68HC16Z1 µC and is fully assembled and tested.

This module provides a working example of a µC

design for customers who have not yet chosen one for

their system or who do not have the ability to connect

the MAX1169 EV kit to their own system. The Windows

software downloads an assembled program to the on-

board random-access memory of the 68HC16 module.

For more information, refer to the 68HC16 module data

sheet.

HS I

C-Compatible Module

The HS I

C-compatible module provides a 2-wire inter-

face peripheral for the 68HC16 µC module using an

Altera EPM3256AQC208-10 PLD. This peripheral is

implemented in the PLD by utilizing the DI2CM core

from Digital Core Design. The HS I

C-compatible mod-

ule allows the 68HC16 module to be compatible with

HS mode (1.7MHz), fast mode (400kHz), and standard

mode (100kHz). This module is not required when eval-

uating the MAX1169 EV kit with a user-supplied I

C-

compatible interface. For more information, refer to the

HS I

C-compatible module data sheet.

MAX1169 EV Kit

The MAX1169 EV kit board provides a proven layout for

evaluating the MAX1169 16-bit, I

C-compatible ADC

and can be obtained separately without the 68HC16

module, USBTO232, and HS I

C-compatible module.

The MAX1169 EV kit contains a 16-bit accurate analog

input buffer (U2), connected in the unity-gain configura-

tion. A REF pad has been provided on the MAX1169 EV

kit board for evaluating the MAX1169 with an external

reference. Refer to the MAX1169 data sheet to ensure

all interface timing specifications are met when a user-

supplied I

C-compatible interface is used.

MAX1169 Evaluation System/Evaluation Kit

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Evaluate: MAX1169 1

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