AD4134 datasheet(46/92 Pages) AD

46 / 92 page

Data Sheet

AD4134

DEVICE CONTROL

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Rev. 0 | 46 of 92

The AD4134 has independent paths for reading data from the ADC

conversions and for controlling the device functionality.

For control, the device can be configured in either of the following

two modes:

►

Pin control mode: pin strapped digital logic inputs (allowing a

subset of the configurability options to be used)

►

SPI control mode: over a 3-wire or 4-wire SPI (complete configu-

rability)

On power-up, the state of the PIN/SPI pin determines the mode

used. SPI control mode offers a full set of configurability, including

access to the AD4134 internal diagnostic features. Pin control

mode offers a subset of selectable features in exchange for easy

configurability. The user can choose the mode of operation by the

voltage level applied to the PIN/SPI pin.

Along with the PIN/SPI pin, four additional pins must be configured

to ensure the correct operation of either SPI or pin control mode.

Table 24 shows a list of pin controlled functions that are common to

pin control mode and SPI control mode operation. The pins listed in

Table 24 are sampled only when the AD4134 is powered on.

Table 24. Common Control Pin Function Summary

Pin Mnemonic

Pin Function

PIN/SPI

Controls the mode selection, pin or SPI.

MODE

ASRC mode of operation selection, master or slave

mode operation.

CLKSEL

Input clock source selection, crystal or CMOS.

DEC0/DCLKIO

DCLK direction selection.

DEC1/DCLKMODE

Gated or Free Running DCLK selection.

PIN CONTROL MODE

Pin control mode eliminates the need for an SPI communication

interface. When a single known configuration is required by the

user, or when only limited reconfiguration is required, the number

of signals that require routing to the digital host can be reduced

using this mode. Pin control mode is useful in digitally isolated ap-

plications where minimal adjustment of the configuration is needed.

Pin control mode helps save on PCB design and eliminates routing

of digital lines.

Pin control offers a subset of the core functionality and ensures a

known state of operation after power-up or reset. Pin control mode

selectable options include the following:

►

Digital filter

►

Frame size

►

Data interface format

►

Decimation rate and DCLK frequency

►

High performance mode or low power mode

Figure 88 shows pin configurable functions. All the pins except the

ones listed in Table 24 can be changed dynamically.

Refer to Figure 89 for more details. A limited set of diagnostics is

available and CLKOUT is enabled by default in pin control mode

only when the crystal option is selected.

Figure 88. Pin Control Mode Configurable Functions

AD4134 Datasheet(PDF) 46 Page - Analog Devices

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