Datasheet

ADS6445, ADS6444
ADS6443, ADS6442
www.ti.com SLAS531B –MAY 2007–REVISED DECEMBER 2009
ELECTRICAL CHARACTERISTICS
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).
ADS6445 ADS6444 ADS6443 ADS6442
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
DYNAMIC AC CHARACTERISTICS
Fin = 10 MHz 73.7 73.8 74.4 74.5
Fin = 50 MHz 68.5 73.1 73.2 70 73.8 70.5 74
Fin = 70 MHz 72.7 69 73 73.4 73.6
Fin = 100 MHz 72.1 72.2 72.7 72.8
SNR
0 dB gain 69.9 70.2 70.5 70.7
Signal to dBFS
Fin = 170
noise ratio
3.5 dB 69.4 69.7 69.7 70.2
MHz
Coarse gain
0 dB gain 68.7 68.8 68.1 69.2
Fin = 230
3.5 dB 68.1 68.2 68.2 68.9
MHz
Coarse gain
Fin = 10 MHz 73.4 73.4 74.2 74.3
Fin = 50 MHz 68 72.3 71.7 69.5 73.5 70 73.7
Fin = 70 MHz 71.2 68.5 72 73 73.2
Fin = 100 MHz 71.8 72 72.2 72
SINAD
Signal to
0 dB gain 67.9 69.8 69.9 70.3
dBFS
noise and
Fin = 170
3.5 dB 68.3 69.3 69.4 70
distortion ratio
MHz
Coarse gain
0 dB gain 67.8 67.7 67.6 68.3
Fin = 230
3.5 dB 67.9 67.6 68.1 68.4
MHz
Coarse gain
RMS Inputs tied to common-mode 1.05 1.05 1.05 1.05 LSB
Output noise
Fin = 10 MHz 87 91 92 93
Fin = 50 MHz 73 81 80 77 87 79 88
Fin = 70 MHz 78 74 81 86 86
Fin = 100 MHz 86 88 84 82
SFDR
Spurious free
0 dB gain 76 79 80 81
dBc
dynamic
Fin = 170
3.5 dB 79 83 84 84
range
MHz
Coarse gain
0 dB gain 77 77 78 79
Fin = 230
3.5 dB 80 80 82 82
MHz
Coarse gain
Fin = 10 MHz 93 94 96 97
Fin = 50 MHz 73 87 88 77 90 79 92
Fin = 70 MHz 87 74 88 90 92
Fin = 100 MHz 89 90 87 87
HD2
0 dB gain 83 84 86 86
Second dBc
Fin = 170
harmonic
3.5 dB 85 86 88 88
MHz
Coarse gain
0 dB gain 80 81 82 83
Fin = 230
3.5 dB 82 83 84 85
MHz
Coarse gain
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