AMC7836IPAPRG4 datasheet(76/91 Pages) TI2

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AMC7836

SLAS986D – NOVEMBER 2014 – REVISED FEBRUARY 2018

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Typical Application (continued)

8.2.1 Design Requirements

The AMC7836 example schematic uses the majority of the design parameters listed in Table 63.

Table 63. Design Parameters

DESIGN PARAMETER

EXAMPLE VALUE

AVCC

5 V

AVEE

–12 V

IOVDD

3.3 V

DVDD

5 V

AVDD

5 V

AVSS banks

AVEE

ADC bipolar inputs

ADC[0-15]: –12.5 to 12.5 V input range

ADC unipolar inputs

LV_ADC[16-20]: 0 to 5 V range

DAC outputs

Sixteen Monotonic 12-bit DACs

Selectable ranges: 0 to 5 V, 0 to 10 V, –10 to 0 V or –5 to 0 V

Remote temperature sensing

IC temperature sensor (LM50) or thermistor

8.2.2 Detailed Design Procedure

Use the following parameters to facilitate the design process:

•

AVCC and AVEE voltage values

•

ADC input voltage range

•

DAC Output voltage Ranges

8.2.2.1 ADC Input Conditioning

The AMC7836 device has an ADC with 21 analog inputs for external voltage sensing. Sixteen of these inputs are

bipolar and the other five are unipolar. The bipolar inputs (ADC_0 through ADC_15) range is –12.5 to 12.5 V,

and the unipolar analog inputs (LV_ADC16 through LV_ADC20) range is 0 to 2 × Vref. The ADC operates from

an internal 2.5 V reference (Vref, measured at the REF_CMP pin). For additional noise filtering, a 4.7-µF

capacitor should be connected between the REF_CMP and AGND2 pins. A high-quality ceramic type NP0 or

X7R is recommended because of the optimal performance of the capacitor across temperature and very-low

dissipation factor.

The ADC timing signals are driven from an on-chip temperature compensated 4-MHz oscillator. The on-chip

oscillator is primarily responsible for the sampling frequency of the ADC. The sampling frequency of the ADC is

dynamic and dependent on the acquisition and conversion time of each channel. Table 64 lists the relationship

between the total update time and the internal oscillator frequency.

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