Datasheet

ADS5281
ADS5282
SBAS397I –DECEMBER 2006–REVISED JUNE 2012 www.ti.com
ELECTRICAL CHARACTERISTICS (BY DEVICE)
(1)
Typical values at +25°C. Minimum and maximum values are measured across the specified temperature range of T
MIN
=
–40°C to T
MAX
= +85°C, AVDD = 3.3V, LVDD = 1.8V, clock frequency = 10MSPS to 65MSPS, 50% clock duty cycle, –1dBFS
differential analog input, internal reference mode, I
SET
resistor = 56.2kΩ, and LVDS buffer current setting = 3.5mA, unless
otherwise noted.
ADS5281 ADS5281 ADS5282
HTQFP-80 QFN-64 QFN-64
50MSPS 50MSPS 65MSPS
PARAMETER TEST CONDITIONS MIN TYP MAX MIN TYP MAX MIN TYP MAX UNIT
DC ACCURACY
No missing codes Assured Assured Assured
DNL Differential nonlinearity –0.75 ±0.25 +0.75 –0.75 ±0.25 +0.75 –0.9 ±0.3 +0.9 LSB
INL Integral nonlinearity –1.5 ±0.7 +1.5 –1.5 ±0.7 +1.5 –1.7 ±0.7 +1.7 LSB
POWER SUPPLY—INTERNAL REFERENCE MODE
IAVDD Analog supply current 119 145 119 145 145 170 mA
ILVDD Digital current Zero input to all channels 76 95 76 95 89 102 mA
Total power 530 649.5 530 649.5 639 744.6 mW
Obtained on powering down one
Incremental power saving 51 51 63 mW
channel at a time
POWER SUPPLY—EXTERNAL REFERENCE MODE
IAVDD Analog supply current 113 113 138 mA
ILVDD Digital current Zero input to all channels 76 76 89 mA
Total power 510 510 616 mW
Obtained on powering down one
Incremental power saving 50 50 61 mW
channel at a time
EXTERNAL REFERENCE LOADING
Current drawn by the eight ADCs
from the external reference
Switching current 2.5 2.5 3.5 mA
voltages; sourcing for REF
T
,
sinking for REF
B
.
DYNAMIC CHARACTERISTICS
f
IN
= 5MHz, single-ended clock 74 85 74 85 72 85 dBc
SFDR Spurious-free dynamic range
f
IN
= 30MHz, differential clock 80 80 80 dBc
f
IN
= 5MHz, single-ended clock 74 85 74 85 72 85 dBc
HD2 Magnitude of second harmonic
f
IN
= 30MHz, differential clock 82 82 82 dBc
f
IN
= 5MHz, single-ended clock 74 85 74 85 72 85 dBc
HD3 Magnitude of third harmonic
f
IN
= 30MHz, differential clock 80 80 80 dBc
f
IN
= 5MHz, single-ended clock 71 80 71 80 70 80
THD Total harmonic distortion
f
IN
= 30MHz, differential clock 78 78 78
f
IN
= 5MHz, single-ended clock 68.3 70 68.3 70 68.3 70 dBFS
SNR Signal-to-noise ratio
f
IN
= 30MHz, differential clock 69.8 69.8 69.8 dBFS
f
IN
= 5MHz, single-ended clock 67.7 69.7 67.7 69.7 67.3 69.7 dBFS
SINAD Signal-to-noise and distortion
f
IN
= 30MHz, differential clock 69.5 69.5 69.5 dBFS
(1) All characteristics are specific to each grade.
6 Copyright © 2006–2012, Texas Instruments Incorporated