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Maxim MAX1402 manual Upgrading the 68HC16 Module, Main Display, Configuration Tool

Models: MAX1402

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MAX1402 Evaluation Kit/Evaluation System

Evaluate: MAX1400/MAX1402

10)Apply input signals to the inputs labeled AIN1–AIN5, at the bottom-edge of the MAX1402 EV kit board. AIN6 is analog common. Observe the readout on the screen.

Upgrading the 68HC16 Module

The MAX1402 EV kit requires Rev. 2.0 of the Maxim 68HC16 Module ROM. Check the label on device U3 on the module; if its label says Rev. 1.0, contact the factory for a replacement.

To install the new ROM, use the following procedure. Use antistatic handling precautions. To reduce the risk of ESD damage, gather all required materials and per- form the installation at one sitting:

1)Slide the ON/OFF switch to the OFF position.

2)Using a flat-blade screwdriver, gently pry U3, the REV 1.0 ROM, out of its socket.

3)Remove the REV 2.0 ROM from its antistatic pack- aging.

4)Align the REV 2.0 ROM in the U3 socket pins. Observe correct polarity (the notch at the top of the ROM). Verify that the pins are lined up with the socket, and gently press the ROM into place.

Proceed to the regular Quick Start instructions.

Detailed Description

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The MAX1402 digitizes up to seven inputs. The various program functions are grouped into windows, which are accessible from the Show menu on the main menu bar.

Main Display

The main display shows the calculated input voltage and raw A/D output code for each active channel. Although there are nine input channels, only certain configurations are allowed.

Select any single channel or one of the scanning sequences from the Inputs menu. AIN 1-6 designates an analog input between the AIN1 pin and the AIN6 pin. CALOFF designates the signal between the CALOFF+ and CALOFF- pins. CALGAIN designates the signal between the CALGAIN+ and CALGAIN- pins.

The EV kit software assumes that CALOFF+ and CALOFF- are grounded so that CALOFF measures zero volts. Similarly, the software assumes that CALGAIN+ is connected to REFIN+ and CALGAIN- is connected to REFIN- so that CALGAIN measures the reference volt- age. These two points calibrate the code-to-voltage translation function performed in the software.

The MAX1400/MAX1402 automatically triggers its mea- surements, unless the FSYNC control bit is set. The evaluation kit software communicates with the MAX1400/MAX1402 at intervals determined by the Update Every combo box. To halt this automatic update, uncheck the Update Every checkbox or change the Update Every to a value between 100ms and 60000ms.

Normally, the microcontroller collects new data as soon as it becomes available, by using the INT pin to trigger an interrupt service routine. If the INT pin is not used as an interrupt, then the MAX1400 must not be operated in free-running mode. Check or uncheck the Use INT Interrupt checkbox to configure the evaluation kit soft- ware.

Configuration Tool

The Configuration Tool controls parameters that apply to the entire EV kit. Like the other windows, the Configuration Tool can be activated from the Show menu of the main menu bar. The CLK control should match the external ceramic resonator or crystal that sets the master clock frequency. The VREF Reference Voltage control tells the software what the reference voltage is. This is used to convert the raw A/D output codes into the corresponding input voltage to speed user evaluation. The Data Rate control determines how often the MAX1402 performs a measurement. Some data rates provide 16-bit, noise-free resolution when used with the SINC3 filter (discussed below). The Filter Sync control can be used to inhibit the MAX1402 from performing its self-timed measurements. The Buffer Inputs checkbox enables the internal input buffers. The Burnout Test Currents checkbox enables two small (0.1µA) current sources to provide an input stimulus. When used with a transducer, these current sources can be used to verify that the transducer has not failed open or short circuit.

At the bottom of the window, there are input voltage range selection buttons. These buttons configure all input channels for the same input voltage range. Although the MAX1400/MAX1402 can be operated with three different input ranges at the same time, the evalu- ation kit software only supports a single range for all channels.

The digital filter on the MAX1402 can be configured for SINC3 or SINC1 operation, which affects the filter cutoff frequency. (SINC' means SIN(X) ÷ X, and SINC3 means (SIN(X) ÷ X)3.) The SINC3 filter is required for 16-bit accu- racy. The SINC1 filter provides faster settling time with less accuracy. Alternatively, the raw modulator output can be driven out the DOUT pin; however, the EV kit software cannot read data from the MAX1402 in this mode.

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Maxim MAX1402 manual Upgrading the 68HC16 Module, Main Display, Configuration Tool
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MAX1402 specifications

The Maxim MAX1402 is a highly integrated, low-power 12-bit analog-to-digital converter (ADC) that boasts high performance and versatility, making it ideal for a range of applications including industrial control, portable instrumentation, and medical devices. This component incorporates advanced technology aimed at providing accurate and efficient signal processing.

One of the primary features of the MAX1402 is its high resolution of 12 bits, which allows it to effectively convert analog signals into digital data with a level of detail suitable for precision measurements. The device operates at a sampling rate of up to 1 MSPS (million samples per second), allowing it to capture rapid changes in input signals, making it particularly adept for applications requiring real-time data acquisition.

Another notable characteristic is its low power consumption. With a typical operating current of only 500 µA, the MAX1402 is well-suited for battery-operated devices, where energy efficiency is paramount. The low power feature, combined with the ability to run off a single supply voltage, enhances the device's adaptability in various circuit designs.

The MAX1402 features an onboard sample-and-hold circuit, which facilitates effective signal stability during the conversion process. This is crucial in preventing distortion from high-frequency signals and helps in achieving precise measurement results even in noisy environments.

The converter supports a differential input configuration, which improves common-mode rejection and enhances the overall performance in industrial applications where noise and interference are common. Additionally, the MAX1402 includes an internal reference voltage source, simplifying system design by eliminating the need for external components.

The device is also equipped with a serial interface, which allows for straightforward integration with microcontrollers and other digital systems. This feature streamlines the process of data transmission, enabling seamless communication and control within various systems.

With its compact design and robust performance, the MAX1402 addresses the need for accurate, low-power ADCs in modern electronic applications. Its combination of features, such as 12-bit resolution, 1 MSPS sampling rate, low power consumption, and integrated functionality, positions it as a reliable choice for engineers and designers seeking to enhance their measurement and control systems.