Datasheet
ADS4126
,
ADS4129
ADS4146
,
ADS4149
SBAS483G – NOVEMBER 2009–REVISED JANUARY 2011
www.ti.com
ELECTRICAL CHARACTERISTICS: ADS4146/ADS4149
Typical values are at +25°C, AVDD = 1.8V, DRVDD = 1.8V, 50% clock duty cycle, –1dBFS differential analog input, 1dB gain,
and DDR LVDS interface, unless otherwise noted. Minimum and maximum values are across the full temperature range:
T
MIN
= –40°C to T
MAX
= +85°C, AVDD = 1.8V, and DRVDD = 1.8V. Note that after reset, the device is in 0dB gain mode.
ADS4146 (160MSPS) ADS4149 (250MSPS)
PARAMETER TEST CONDITIONS MIN TYP MAX MIN TYP MAX UNIT
Resolution 14 14 Bits
f
IN
= 10MHz 72.2 71.9 dBFS
f
IN
= 70MHz 72 71.4 dBFS
SNR (signal-to-noise ratio), LVDS f
IN
= 100MHz 71.5 71.4 dBFS
f
IN
= 170MHz 68.5 70.8 67.5 70.6 dBFS
f
IN
= 300MHz 69 69 dBFS
f
IN
= 10MHz 72 71.6 dBFS
f
IN
= 70MHz 71.8 71 dBFS
SINAD (signal-to-noise and distortion ratio),
f
IN
= 100MHz 71.4 70.9 dBFS
LVDS
f
IN
= 170MHz 67.5 70.4 66 69.4 dBFS
f
IN
= 300MHz 68.2 67.4 dBFS
f
IN
= 10MHz 88 87 dBc
f
IN
= 70MHz 87 82 dBc
Spurious-free dynamic range SFDR f
IN
= 100MHz 86 81 dBc
f
IN
= 170MHz 74.5 82 72 84 dBc
f
IN
= 300MHz 77 75 dBc
f
IN
= 10MHz 86.5 85 dBc
f
IN
= 70MHz 85 80 dBc
Total harmonic distortion THD f
IN
= 100MHz 84 79 dBc
f
IN
= 170MHz 72 81 71 80.5 dBc
f
IN
= 300MHz 74.5 71.5 dBc
f
IN
= 10MHz 91 89 dBc
f
IN
= 70MHz 90 85 dBc
Second-harmonic distortion HD2 f
IN
= 100MHz 88 84 dBc
f
IN
= 170MHz 74.5 88 72 84 dBc
f
IN
= 300MHz 79 75 dBc
f
IN
= 10MHz 88 87 dBc
f
IN
= 70MHz 87 82 dBc
Third-harmonic distortion HD3 f
IN
= 100MHz 86 81 dBc
f
IN
= 170MHz 74.5 82 72 82 dBc
f
IN
= 300MHz 77 75 dBc
f
IN
= 10MHz 91 90 dBc
f
IN
= 70MHz 90 88 dBc
Worst spur
f
IN
= 100MHz 90 90 dBc
(other than second and third harmonics)
f
IN
= 170MHz 78 90 77 88 dBc
f
IN
= 300MHz 88 88 dBc
f
1
= 46MHz, f
2
= 50MHz,
–88 –88 dBFS
each tone at –7dBFS
Two-tone intermodulation
IMD
distortion
f
1
= 185MHz, f
2
= 190MHz,
–86 –86 dBFS
each tone at –7dBFS
Recovery to within 1% (of final
Clock
Input overload recovery value) for 6dB overload with 1 1
cycles
sine-wave input
For 100mV
PP
signal on AVDD
AC power-supply rejection ratio PSRR > 30 > 30 dB
supply, up to 10MHz
Effective number of bits ENOB f
IN
= 170MHz 11.5 11.3 LSBs
Differential nonlinearity DNL f
IN
= 170MHz –0.95 ±0.5 –0.95 ±0.5 LSBs
Integrated nonlinearity INL f
IN
= 170MHz ±2 ±4.5 ±2 ±5 LSBs
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