AD4134 datasheet(56/92 Pages) AD

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Data Sheet

AD4134

DYNAMIC RANGE ENHANCEMENT, CHANNEL AVERAGING

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Rev. 0 | 56 of 92

The AD4134 is equipped with built-in 4-channel and 2-channel

averaging functions that increase the performance by 6 dB and 3

dB. The device performs on-board averaging of the output data

from two or four of its ADC channels to improve the dynamic range.

Averaging is a digital postprocessing option after the digital filter,

which performs averaging of the output data from multiple ADC

channels. This averaging feature allows the user to measure a sig-

nal with multiple ADC channels and average the result to achieve

higher dynamic range.

In 4:1 averaging mode, a single input signal is applied to all four

input channels, as shown in Figure 92. In this mode with averaging

enabled, the AD4134 is a single-channel device with the dynamic

range improved by 6 dB.

In 2:1 averaging mode, a single input signal is applied to two input

channels, as shown in Figure 93. In this mode with averaging

enabled, the AD4134 behaves as a 2-channel device with each

channel dynamic range improved by 3 dB.

For noise performance of channel averaging, see the Noise Per-

formance and Resolution section.

Figure 92 and Figure 93 show the connection diagrams for using

these functions. For 4:1 channel averaging, short all four inputs

together, but for 2:1 channel averaging short two inputs together.

Figure 92. 4:1 Channel Averaging

Figure 93. 2:1 Channel Averaging

In pin control mode, only 4:1 averaging is available through the

configuration of the FORMAT0/ pin and FORMAT1/SCLK pin, as

shown in Table 32.

In SPI control mode, set the format bits, Bits[1:0] in Register 0x12

to 11 to enable the output averaging function. Then use Bits[3:2] in

AD4134 Datasheet(PDF) 56 Page - Analog Devices