7.2.3 Application Curve

The effective number of bits (ENOB) is often used to compare the performance of ADCs and ΔΣ modulators.

Figure 7-3 shows the ENOB of the AMC0106M25 with different oversampling ratios.

1

10

100

1000

OSR

0

2

4

6

8

10

12

14

16

sinc1

sinc2

sinc3

G013

Figure 7-3. Measured Effective Number of Bits vs Oversampling Ratio

7.3 Best Design Practices

Place a minimum 10nF capacitor at the device input (from INP to INN). This capacitor helps avoid voltage droop

at the input during the sampling period of the switched-capacitor input stage.

Do not leave the inputs of the AMC0106M25 unconnected (floating) when the device is powered up. If either

modulator input is left floating, the output bitstream is not valid.

Connect the high-side ground (AGND) to INN, either by a hard short or through a resistive path. A DC current

path between INN and AGND is required to define the input common-mode voltage. Do not exceed the input

common-mode range, as specified in the Recommended Operating Conditions table. For best accuracy, route

the ground connection as a separate trace that connects directly to the sense resistor. Do not short AGND to

INN directly at the device input. See the Layout section for more details.

AMC0106M25

SBASAX1A – AUGUST 2024 – REVISED JULY 2025

www.ti.com

26

Submit Document Feedback

Copyright © 2025 Texas Instruments Incorporated

Product Folder Links: AMC0106M25