AMC3336 datasheet(29/41 Pages) TI

29 / 41 page

8.2.1.3 Application Curve

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

Figure 8-3 shows the ENOB of the AMC3336 with different oversampling ratios. By using Equation 3, this

number can also be calculated from the SINAD:

SINAD = 1.76 dB + 6.02 dB x ENOB

(3)

OSR

100

1000

sinc3

sinc2

sinc1

Figure 8-3. Measured Effective Number of Bits vs Oversampling Ratio

8.2.2 What To Do and What Not To Do

Do not leave the inputs of the AMC3336 unconnected (floating) when the device is powered up. If both

modulator inputs are left floating, the modulator outputs a bitstream that is undefined.

Connect the high-side ground (HGND) to INN, either directly or through a resistive path. A DC current path

between INN and HGND is required to define the input common-mode voltage. Take care not to exceed the input

common-mode range, as specified in the Recommended Operating Conditions table.

The high-side LDO can source a limited amount of current (IH) to power external circuitry. Take care not to

over-load the high-side LDO and be aware of the drating of IH at high temperatures as explined in the Isolated

DC/DC Converter section.

The low-side LDO does not output a constant voltage and is not intended for powering any external circuitry. Do

not connect any external load to the HLDO_OUT pin.

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AMC3336

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AMC3336 Datasheet(PDF) 29 Page - Texas Instruments