AMC7832IPAPR datasheet(56/74 Pages) TI2

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= F

V × C

AMC7832

SLAS836 – MARCH 2014

www.ti.com

Typical Application (continued)

9.2.2 Design Requirements

The AMC7832 Example Schematic uses most of the following design parameters.

Table 54. Design Parameters

DESIGN PARAMETER

EXAMPLE VALUE

AVCC

AVEE

-12V

IOVDD

3.3V

DVDD

AVDD

ADC Bipolar inputs

(ADC0 – ADC11)

-12.5 to +12.5-V input range

ADC Unipolar inputs

(LV_ADC12 – LV_ADC16)

0 to +5-V range

VRANGEA: GND

[0 to +5-V Range]

VRANGEB: GND

[0 to +5-V Range]

DAC Output voltage Ranges

VRANGEC: 2.5V (REF_OUT2)

[-10 to 0-V Range]

VRANGED: 2.5V (REF_OUT2)

[-10 to 0-V Range]

Remote temperature sensing

IC Temperature sensor (LM50) or thermistor

9.2.3 Detailed Design Procedure

The following displays a set of parameters and concepts that will facilitate the design process:

•

AVCC and AVEE voltage values

•

ADC input voltage range

•

DAC Output voltage Ranges

•

Remote temperature applications

9.2.3.1 ADC Input Conditioning

The AMC7832 has a single ADC core that features a multi-channel multiplexer input stage to a successive

approximation register (SAR) ADC. The analog inputs are separated into two input classes: bipolar ADC inputs

(high-voltage) and unipolar ADC Inputs (low-voltage). The high-voltage analog inputs (ADC_0 – ADC_11) feature

a -12.5-V to +12.5-V input range, while the low-voltage analog inputs (LV_ADC12 – LV_ADC16) accept a full-

scale range of 0 to 2 x VREF (VREF corresponds to a +2.5-V internal reference to the ADC block, and is externally

available on the REF_CMP pin). For additional noise filtering, a 4.7-µF capacitor is recommended between the

REF_CMP and GND. The value of this cap must exceed 470nF to ensure reference stability. A high-quality

ceramic type NP0 or X7R is recommended for its optimal performance across temperature, and very low

dissipation factor.

During conversion the input current per channel will vary with the total update time which is determined by the

number and type of channels (NCH) and the conversion rate setting CONV-RATE in the ADC Configuration

(5)

Where:

CIN: Internal ADC input channel capacitance

ΔV : The maximum voltage difference between analog inputs

FS = f(CONVRATE, NCHBIPOLAR, NCHUNIPOLAR) = 1/TS

The total update time (TS) can be determined from Table 55.

Table 55. ADC Update Time per Input Channel

TS (μs) / CHANNEL

TS (μs)

CONV-RATE[1:0]

UNIPOLAR INPUT CHANNEL

BIPOLAR INPUT CHANNEL

TEMPERATURE SENSOR CHANNEL

11.5

34.5

256

34.5

256

34.5

256

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