Datasheet

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ADS6245 , ADS6244
ADS6243 , ADS6242
SLAS542A – MAY 2007 – REVISED JULY 2007
ELECTRICAL CHARACTERISTICS (continued)
Typical values are at 25 ° C, min and max values are across the full temperature range T
MIN
= – 40 ° C to T
MAX
= 85 ° C, AVDD =
LVDD = 3.3 V, maximum rated sampling frequency, 50% clock duty cycle, – 1dBFS differential analog input, internal reference
mode (unless otherwise noted).
ADS6245 ADS6244 ADS6243 ADS6242
F
s
= 125 MSPS F
s
= 105 MSPS F
s
= 80 MSPS F
s
= 65 MSPS
PARAMETER TEST CONDITIONS UNIT
MIN TYP MAX MIN TYP MAX MIN TYP MAX MIN TYP MAX
Fin = 10 MHz 87 91 92 93
Fin = 50 MHz 73 81 79 77 87.5 79 88
Fin = 70 MHz 78 74 81 86 86
Fin = 100 MHz 86 88 84 82
HD3
0 dB gain 76 79 80 81
Third dBc
Fin = 170
harmonic
3.5 dB Coarse 79 83 84 84
MHz
gain
0 dB gain 77 77 78 79
Fin = 230
3.5 dB Coarse 80 80 82 82
MHz
gain
Fin = 10 MHz 91 91 94 95
Fin = 50 MHz 87 87 92 93
Worst
harmonic
Fin = 100 MHz 90 90 91 92 dBc
(other than
HD2, HD3)
Fin = 170 MHz 88 88 90 90
Fin = 230 MHz 87 87 87 87
Fin = 10 MHz 86 89.5 89 91
Fin = 50 MHz 71 78 78.5 75 85.5 77 85.6
THD
Fin = 70 MHz 77 72 80 84 84
Total
dBc
harmonic
Fin = 100 MHz 84.5 86 83 80.5
distortion
Fin = 170 MHz 73.5 77 78.5 79.5
Fin = 230 MHz 74 75 76 77
ENOB Fin = 50 MHz 11.0 11.7 11.1 11.9 11.4 12
Effective
Bits
number of
Fin = 70 MHz 11.3 11.7
bits
F1= 46.09 MHz,
IMD
88 90 96 100
F2 = 50.09 MHz
2-Tone
dBFS
intermodulatio
F1= 185.09 MHz,
86 88 93 96
n distortion
F2 = 190.09 MHz
Near channel
Cross-talk signal 90 92 94 100
frequency = 10 MHz
Cross-talk dBc
Far channel
Cross-talk signal 103 105 106 108
frequency = 10 MHz
Input Recovery to within 1% (of final
Clock
overload value) for 6-dB overload with 1 1 1 1
cycles
recovery sine wave input
AC PSRR
Power Supply < 100 MHz signal, 100 mV
PP
on
35 35 35 35 dBc
Rejection AVDD supply
Ratio
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