ADFS7124-8BBCPZ datasheet(36/93 Pages) AD

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Data Sheet

ADFS7124-8

GETTING STARTED

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Rev. 0 | 36 of 93

Figure 64. Basic Connection Diagram

OVERVIEW

The ADFS7124-8 is a low power ADC that incorporates a Σ-Δ

modulator, buffer, reference, gain stage, and on-chip digital filtering,

which is intended for the measurement of wide dynamic ranges, low

frequency signals (such as those in pressure transducers), weigh

scales, and temperature measurement applications.

Power Modes

The ADFS7124-8 offers three power modes: full power mode, mid

power mode, and low power mode. This allows total flexibility in

terms of speed, RMS noise, and current consumption.

Analog Inputs

The device can have 8 differential or 15 pseudo differential analog

inputs. The analog inputs can be buffered or unbuffered. The

ADFS7124-8 uses flexible multiplexing; thus, any analog input pin

can be selected as a positive input (AINP) and any analog input pin

can be selected as a negative input (AINM).

Multiplexer

The on-chip multiplexer increases the channel count of the device.

Because the multiplexer is included on chip, any channel changes

are synchronized with the conversion process.

Reference

The device contains a 2.5 V reference, which has a drift of

15 ppm/°C maximum.

Reference buffers are also included on chip, which can be used

with externally applied references.

Programmable Gain Amplifier (PGA)

The analog input signal can be amplified using the PGA. The PGA

allows gains of 1, 2, 4, 8, 16, 32, 64, and 128.

Burnout Currents

Two burnout currents, which can be programmed to 500 nA, 2 µA,

or 4 µA, are included on chip to detect the presence of the external

sensor.

Σ-Δ ADC and Filter

The ADFS7124-8 contains a fourth-order Σ-Δ modulator followed by

a digital filter. The device has the following filter options:

►

Sinc4

►

Sinc3

►

Fast filter

►

Post filter

►

Zero latency

Channel Sequencer

The ADFS7124-8 allows up to 16 configurations, or channels.

These channels can consist of analog inputs, reference inputs, or

power supplies such that diagnostic functions, such as power sup-

ply monitoring, can be interleaved with conversions. The sequencer

automatically converts all enabled channels. When each enabled

channel is selected, the time required to generate the conversion is

equal to the settling time for the selected channel.

Per Channel Configuration

The ADFS7124-8 allows up to eight different setups, each setup

consisting of a gain, output data rate, filter type, and a reference

source. Each channel is then linked to a setup.

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