ADC3908CSSS datasheet(115/131 Pages) TI1

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7 Application Information Disclaimer

Note

Information in the following applications sections is not part of the TI component specification,

and TI does not warrant its accuracy or completeness. TI’s customers are responsible for

determining suitability of components for their purposes, as well as validating and testing their design

implementation to confirm system functionality.

7.1 Application Information

The ADC3910D125 can be used in a wide range of applications including radio receivers, LiDAR low latency

control loops, laser scanners, global positioning systems and detection equipment. The Typical Applications

section describe one configuration that meets the needs of a number of these applications.

7.2 Typical Application

A spectrum analyzer is a typical frequency domain application for the ADC3910D125 and its front end circuitry

is similar to several other systems such as software defined radio (SDR), sonar, radar or communications. Some

applications require frequency coverage including DC or near DC, so it is included in this example.

Control

AIN

VREF

ADC

1.25V

VCM

DCLK

D11

Dig I/F

FPGA

1.2V REF

1 k

AVDD

Device Clock

AMP

CVCM

NCO

Low Pass Filter

AMP

BIN

0.1 uF

10 uF

CLK

1 k

Low Pass Filter

Figure 7-1. Typical configuration for a spectrum analyzer with DC support

7.2.1 Design Requirements

Frequency domain applications cover a wide range of frequencies from low input frequencies at or near DC in

the 1st Nyquist zone to undersampling in higher Nyquist zones. If very low input frequency is supported then the

input has to be DC coupled and the ADC driven by a fully differential amplifier (FDA). If low frequency support is

not needed then AC coupling and use of a balun may be more suitable.

The internal reference is used since DC precision is not needed. However the ADC AC performance is highly

dependent on the quality of the external clock source. If in-band interferes can be present, then the ADC

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ADC3910D125

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