ADC3421 datasheet(29/80 Pages) TI2

29 / 80 page

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ADC3421, ADC3422, ADC3423, ADC3424

www.ti.com

SBAS673A – JULY 2014 – REVISED OCTOBER 2015

Typical Characteristics: ADC3423 (continued)

Typical values are at TA = 25°C, ADC sampling rate = 80 MSPS, 50% clock duty cycle, AVDD = 1.8 V, DVDD = 1.8 V, –1-

dBFS differential input, 2-VPP full-scale, 32k-point FFT, chopper disabled, and SNR reported with a 1-MHz offset from dc

when chopper is disabled and from fS / 2 when chopper is enabled, unless otherwise noted.

SFDR = 76 dBc, SNR = 69.2 dBFS, SINAD = 68.3 dBFS,

SFDR = 75 dBc, SNR = 69.5 dBFS, SINAD = 68.4 dBFS,

THD = 75 dBc, HD2 = 76 dBc, HD3 = 81 dBc

THD = 75 dBc, HD2 = 75 dBc, HD3 = 82 dBc

Figure 67. FFT for 270-MHz Input Signal (Dither On)

Figure 68. FFT for 270-MHz Input Signal (Dither Off)

SFDR = 68 dBc, SNR = 67.5 dBFS, SINAD = 67.1 dBFS,

SFDR = 67 dBc SNR = 67.7 dBFS, SINAD = 67.3 dBFS,

THD = 77 dBc, HD2 = 68 dBc, HD3 = 89 dBc

THD = 77 dBc, HD2 = 67 dBc, HD3 = 84 dBc

Figure 69. FFT for 450-MHz Input Signal (Dither On)

Figure 70. FFT for 450-MHz Input Signal (Dither Off)

fIN1 = 46 MHz, fIN2 = 50 MHz, IMD3 = 98 dBFS,

fIN1 = 46 MHz, fIN2 = 50 MHz, IMD3 = 105 dBFS,

each tone at –7 dBFS

each tone at –36 dBFS

Figure 71. FFT for Two-Tone Input Signal

Figure 72. FFT for Two-Tone Input Signal

(–7 dBFS at 46 MHz and 50 MHz)

(–36 dBFS at 46 MHz and 50 MHz)

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