ADC3421 datasheet(69/80 Pages) TI2

69 / 80 page

Frequency (MHz)

12.5

37.5

62.5

-120

-110

-100

-90

-80

-70

-60

-50

-40

-30

-20

-10

D209

INP

INM

VCM

1:1

0.1 PF

1:1

0.1 PF

Device

ADC3421, ADC3422, ADC3423, ADC3424

www.ti.com

SBAS673A – JULY 2014 – REVISED OCTOBER 2015

Typical Applications (continued)

10.2.3 Driving Circuit Design: Input Frequencies Greater than 230 MHz

Figure 187. Driving Circuit for High Input Frequencies (fIN > 230 MHz)

10.2.3.1 Design Requirements

See the Design Requirements section for further details.

10.2.3.2 Detailed Design Procedure

For high input frequencies (> 230 MHz), using the R-C-R or R-LC-R circuit does not show significant

improvement in performance. However, a series resistance of 10

Ω can be used as shown in Figure 187.

10.2.3.3 Application Curve

Figure 188 shows the performance obtained by using the circuit shown in Figure 187.

SFDR = 71 dBc, SNR = 67.2 dBFS, SINAD = 66.5 dBFS,

THD = 74 dBc, HD2 = 71 dBc, HD3 = 79 dBc

Figure 188. Performance FFT at 450 MHz (High Input Frequency)

11 Power Supply Recommendations

The device requires a 1.8-V nominal supply for AVDD and DVDD. There are no specific sequence power-supply

requirements during device power-up. AVDD and DVDD can power up in any order.

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Product Folder Links: ADC3421 ADC3422 ADC3423 ADC3424

ADC3421 Datasheet(PDF) 69 Page - Texas Instruments

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