AD4134 datasheet(67/92 Pages) AD

67 / 92 page

Data Sheet

AD4134

DIGITAL INTERFACE

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Rev. 0 | 67 of 92

onto the DOUT0 pin and DOUT1 pin of the final upstream device in

the chain.

Figure 118. Data Interface Connection with 2-Channel Daisy-Chaining

Configuration

Figure 119. Data Interface Connection with 1-Channel Daisy-Chaining

Configuration

Daisy-chaining can be achieved in a similar manner on the AD4134

when using only the DOUT0 pin. In this case, only the DOUT2 pin

is used as the serial data input pin, as shown in Figure 119.

If the AD4134 is used in the chain as a master for generating

the ODR and DCLK, the user must program the DAISY_CHAIN_

DEV_NUM bits to let the device know how many devices are

connected to it. Programming the DAISY_CHAIN_DEV_NUM bits

ensures that the AD4134 generates a sufficient number of DCLK

cycles to clock the data out from all the devices in the chain. For

example, in Figure 120, program the DAISY_CHAIN_ DEV_NUM

bits in the master device to 0x01 so that the AD4134 can generate

the number of DCLK cycles to clock out data from both the devices.

Figure 120. Single Channel Daisy Chain for Master Slave Configuration

The number of devices supported on a chain is limited by the DCLK

frequency chosen for a given output data rate.

The maximum usable DCLK frequency allowed when daisy-chain-

ing devices is limited by the combination of timing specifications

and the DCLK mode of operation.

Data Interface Frame Length

The AD4134 data interface operates with the byte-based transfer

scheme. That is, the transactions are in multiples of eight bits.

The data frame length, defined as the number of data bytes per

ODR cycle per DOUTx pin, depends on the following factors:

►

Conversion output word size

►

Status or CRC header

►

Data output format configuration

►

Daisy-chain configuration

►

Data averaging

The conversion output word size can be 16 bits or 24 bits.

It is optional to include a status or CRC header byte with each

conversion result to improve the communication robustness and to

receive real-time error status.

The user can choose to parallel or serialize the output data. Serial-

izing the output data from four ADC channels to one DOUTx pin

increases the data frame length by 4×.

If multiple devices are daisy-chained, the total data frame length is

equal to the sum of the data frame length of the individual devices

on the chain.

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