ADC3421 datasheet(68/80 Pages) TI2

68 / 80 page

Frequency (MHz)

12.5

37.5

62.5

-120

-110

-100

-90

-80

-70

-60

-50

-40

-30

-20

-10

D205

INP

INM

VCM

1:1

0.1 PF

1:1

10 pF

0.1 PF

56 nH

Device

ADC3421, ADC3422, ADC3423, ADC3424

SBAS673A – JULY 2014 – REVISED OCTOBER 2015

www.ti.com

Typical Applications (continued)

10.2.2 Driving Circuit Design: Input Frequencies Between 100 MHz to 230 MHz

Figure 185. Driving Circuit for Mid-Range Input Frequencies (100 MHz < fIN < 230 MHz)

10.2.2.1 Design Requirements

See the Design Requirements section for further details.

10.2.2.2 Detailed Design Procedure

When input frequencies are between 100 MHz to 230 MHz, an R-LC-R circuit can be used to optimize

performance, as shown in Figure 185.

10.2.2.3 Application Curve

Figure 186 shows the performance obtained by using the circuit shown in Figure 185.

SFDR = 86 dBc, SNR = 69.8 dBFS, SINAD = 69.8 dBFS,

THD = 91 dBc, HD2 = 86 dBc, HD3 = 101 dBc

Figure 186. Performance FFT at 170 MHz (Mid Input Frequency)

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Product Folder Links: ADC3421 ADC3422 ADC3423 ADC3424

ADC3421 Datasheet(PDF) 68 Page - Texas Instruments

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