ADS6425 Datasheet, PDF (27/56 Pages) Texas Instruments – QUAD CHANNEL, 12-BIT, 125-MSPS ADC WITH SERIAL LVDS INTERFACE

ADS6425
www.ti.com
SLWS197 – MARCH 2007
TYPICAL CHARACTERISTICS (continued)
All plots are at 25°C, AVDD = LVDD = 3.3 V, sampling frequency = 125 MSPS, sine wave input clock, 1.5 V_PP differential
clock amplitude, 50% clock duty cycle, –1 dBFS differential analog input, internal reference mode, 0 dB gain (unless
otherwise noted)
OUTPUT NOISE HISTOGRAM WITH
INPUTS TIED TO COMMON-MODE
80
RMS = 0.407 LSB
70
60
50
40
30
20
10
0
2044 2045 2046 2047 2048 2049 2050
Output Code
G017
Figure 24.
PERFORMANCE IN EXTERNAL REFERENCE MODE
94
73
f_IN = 50.1 MHz
External Reference Mode
92
72
90
71
SNR
88
70
SFDR
86
69
84
68
1.30 1.35 1.40 1.45 1.50 1.55 1.60 1.65 1.70
V_VCM − VCM Voltage − V
G018
Figure 25.
0
−10
−20
−30
−40
−50
−60
−70
−80
−90
−100
0
CMRR
vs
FREQUENCY
50
100
150
200
250
300
f − Frequency − MHz
G019
Figure 26.
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