Datasheet

ADS5281
ADS5282
www.ti.com SBAS397I –DECEMBER 2006–REVISED JUNE 2012
ELECTRICAL CHARACTERISTICS
(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.
ADS528x
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
INTERNAL REFERENCE VOLTAGES
V
REFB
Reference bottom 0.5 V
V
REFT
Reference top 2.5 V
V
REFT
– V
REFB
1.95 2.0 2.05 V
V
CM
Common-mode voltage (internal) 1.425 1.5 1.575 V
V
CM
output current ±2 mA
EXTERNAL REFERENCE VOLTAGES
V
REFB
Reference bottom 0.4 0.5 0.6 V
V
REFT
Reference top 2.4 2.5 2.6 V
V
REFT
– V
REFB
1.9 2.0 2.1 V
ANALOG INPUT
Differential input voltage range 2.0 V
PP
Differential input capacitance 3 pF
Analog input bandwidth 520 MHz
Analog input common-mode range DC-coupled input V
CM
± 0.05 V
Per input pin per MSPS of sampling μA/MHz
Analog input common-mode current 2.5
speed per pin
Recovery from 6dB overload to within 1%
Voltage overload recovery time 1 Clock cycle
accuracy
Standard deviation seen on a periodic
Voltage overload recovery repeatability first data within full-scale range in a 6dB 1 LSB
overloaded sine wave
DC ACCURACY
Offset error –1.25 ±0.2 +1.25 %FS
Offset error temperature coefficient
(2)
±5 ppm/°C
Channel gain error Excludes error in internal reference –0.8 %FS
Channel gain error temperature Excludes temperature coefficient of
±10 ppm/°C
coefficient internal reference
Internal reference error temperature
±15 ppm/°C
coefficient
(3)
DC PSRR DC power-supply rejection ratio
(4)
1.5 mV/V
POWER-DOWN MODES
Power in complete power-down mode 45 mW
Power in partial power-down mode Clock at 65MSPS 135 mW
Power with no clock 88 mW
DYNAMIC PERFORMANCE
5MHz full-scale signal applied to seven
Crosstalk channels, measurement taken on channel –90 dBc
with no input signal
Two-tone, third-order intermodulation f
1
= 9.5MHz at –7dBFs
–92 dBFS
distortion f
2
= 10.2MHz at –7dBFs
(1) All characteristics are common for the ADS528x family.
(2) The offset temperature coefficient in ppm/°C is defined as (O
1
– O
2
) × 10
6
/(T
1
– T
2
)/4096, where O
1
and O
2
are the offset codes in LSB
at the two extreme temperatures, T
1
and T
2
.
(3) The internal reference temperature coefficient is defined as (REF
1
– REF
2
) × 10
6
/(T
1
– T
2
)/2, where REF
1
and REF
2
are the internal
reference voltages (V
REFT
– V
REFB
) at the two extreme temperatures, T
1
and T
2
.
(4) DC PSRR is defined as the ratio of the change in the ADC output (expressed in mV) to the change in supply voltage (in volts).
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