ADC324X Datasheet, PDF (36/81 Pages) Texas Instruments – The ADC324x are a high-linearity

ADC3241, ADC3242, ADC3243, ADC3244
SBAS671B – JULY 2014 – REVISED MARCH 2015
www.ti.com
7.19 Typical Characteristics: ADC3244
Typical values are at T_A= 25°C, ADC sampling rate = 125 MSPS, 50% clock duty cycle, AVDD = 1.8 V, DVDD = 1.8 V, –1-
dBFS differential input, 2-V_PP full-scale, 32k-point FFT, chopper disabled, and SNR reported with a 1-MHz offset from dc
when chopper is disabled and from f_S / 2 when chopper is enabled, unless otherwise noted.
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120
0
12.5
25
37.5
50
62.5
Frequency (MHz)
D101
SFDR = 102.6 dBc, SNR = 72.9 dBFS, SINAD = 72.8 dBFS,
THD = 99.8 dBc, HD2 = –108.6 dBc, HD3 = –104.0 dBc
Figure 94. FFT for 10-MHz Input Signal
(Chopper On, Dither On)
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120
0
12.5
25
37.5
50
62.5
Frequency (MHz)
D103
SFDR = 95.9 dBc, SNR = 72.7 dBFS, SINAD = 72.7 dBFS,
THD = 93.6 dBc, HD2 = –100.6 dBc, HD3 = –95.9 dBc
Figure 96. FFT for 70-MHz Input Signal (Dither On)
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120
0
12.5
25
37.5
50
62.5
Frequency (MHz)
D105
SFDR = 96.4 dBc, SNR = 72.1 dBFS, SINAD = 72.0 dBFS,
THD = 92.6 dBc, HD2 = –96.4 dBc, HD3 = –98.8 dBc
Figure 98. FFT for 170-MHz Input Signal (Dither On)
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120
0
12.5
25
37.5
50
62.5
Frequency (MHz)
D102
SFDR = 91.8 dBc, SNR = 73.5 dBFS, SINAD = 73.4 dBFS,
THD = 87.3 dBc, HD2 = –93.8 dBc, HD3 = –91.8 dBc
Figure 95. FFT for 10-MHz Input Signal
(Chopper On, Dither Off)
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120
0
12.5
25
37.5
50
62.5
Frequency (MHz)
D104
SFDR = 90.9 dBc, SNR = 73.3 dBFS, SINAD = 73.1 dBFS,
THD = 87 dBc, HD2 = –90.9 dBc, HD3 = –94.9 dBc
Figure 97. FFT for 70-MHz Input Signal (Dither Off)
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120
0
12.5
25
37.5
50
62.5
Frequency (MHz)
D106
SFDR = 89.9 dBc, SNR = 72.8 dBFS, SINAD = 72.6 dBFS,
THD = 87.1 dBc, HD2 = –97.2 dBc, HD3 = –89.9 dBc
Figure 99. FFT for 170-MHz Input Signal (Dither Off)
36
Submit Documentation Feedback
Copyright © 2014–2015, Texas Instruments Incorporated
Product Folder Links: ADC3241 ADC3242 ADC3243 ADC3244