ADS58B18_11 Datasheet, PDF (32/68 Pages) Texas Instruments – 11-Bit, 200MSPS/9-Bit, 250MSPS, Ultralow-Power ADCs with Analog Buffer

ADS58B18
ADS58B19
SBAS487D – NOVEMBER 2009 – REVISED JANUARY 2011
www.ti.com
TYPICAL CHARACTERISTICS: ADS58B18
At +25°C, AVDD = 1.8V, AVDD_BUF = 3.3V, DRVDD = 1.8V, maximum rated sampling frequency, sine wave input clock,
1.5V_PP differential clock amplitude, 50% clock duty cycle, –1dBFS differential analog input, DDR LVDS output interface, and
32k-point FFT, unless otherwise noted.
FFT FOR 20MHz INPUT SIGNAL
0
SFDR = 92.8dBc
−10
SNR = 66.1dBFS
SINAD = 66.1dBFS
−20
THD = 89.5dBc
−30
FFT FOR 170MHz INPUT SIGNAL
0
SFDR = 81.8dBc
−10
SNR = 65.8dBFS
SINAD = 65.7dBFS
−20
THD = 80.6dBc
−30
−40
−40
−50
−50
−60
−60
−70
−70
−80
−80
−90
−90
−100
−100
−110
−110
−120
0
20
40
60
80
100
−120
0
20
40
60
80
100
Frequency (MHz)
Figure 14.
Frequency (MHz)
Figure 15.
0
−10
−20
−30
−40
−50
−60
−70
−80
−90
−100
−110
−120
0
FFT FOR TWO-TONE INPUT SIGNAL
Each Tone at −7dBFS Amplitude
SFDR = 99.83dBFS
f_IN1 = 185MHz
f_IN2 = 190MHz
Two-Tone IMD = 86.81dBFS
20
40
60
80
100
Frequency (MHz)
Figure 16.
0
−10
−20
−30
−40
−50
−60
−70
−80
−90
−100
−110
−120
0
FFT FOR TWO-TONE INPUT SIGNAL
Each Tone at −36dBFS Amplitude
SFDR = 98.38dBFS
f_IN1 = 185MHz
f_IN2 = 190MHz
Two-Tone IMD = 96.95dBFS
20
40
60
80
100
Frequency (MHz)
Figure 17.
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