ADS5231
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SBAS295A–JULY 2004–REVISED JANUARY 2007
ELECTRICAL CHARACTERISTICS
TMIN = –40°C and TMAX = +85°C. Typical values are at TA = +25°C, clock frequency = 40MSPS, 50% clock duty cycle,
AVDD = 3.3V, VDRV = 3.3V, transformer-coupled inputs, –1dBFS, ISET = 56.2kΩ, and internal voltage reference, unless
otherwise noted.
ADS5231
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
DC ACCURACY
No Missing Codes
Tested
±0.3
±0.4
±0.2
±6
DNL Differential Nonlinearity
INL Integral Nonlinearity
fIN = 5MHz
fIN = 5MHz
–0.9
–2.5
+0.9
+2.5
LSB
LSB
Offset Error(1)
–0.75
+0.75
% FS
ppm/°C
%FS
Offset Temperature Coefficient(2)
Fixed Attenuation in Channel(3)
Fixed Attenuation Matching Across Channels
Gain Error/Reference Error(4)
Gain Error Temperature Coefficient
POWER REQUIREMENTS(5)
Internal Reference
1
0.01
±1.0
±40
0.2
dB
–3.5
+3.5
% FS
ppm/°C
Power Dissipation(5)
Analog Only (AVDD)
Output Driver (VDRV)
235.5
85.5
321
271
109
380
mW
mW
mW
Total Power Dissipation
External Reference
Power Dissipation
Analog Only (AVDD)
Output Driver (VDRV)
200
85.5
mW
mW
mW
mW
Total Power Dissipation
Total Power-Down
285.5
Clock Running
83
REFERENCE VOLTAGES
VREFT Reference Top (internal)
VREFB Reference Bottom (internal)
VCM Common-Mode Voltage
VCM Output Current(6)
1.9
0.9
1.4
2.0
1.0
1.5
±2
2.1
1.1
1.6
V
V
V
±50mV Change in Voltage
mA
V
VREFT Reference Top (external)
VREFB Reference Bottom (external)
External Reference Common-Mode
External Reference Input Current(7)
1.875
1.125
V
V
CM ± 50mV
V
1.0
mA
(1) Offset error is the deviation of the average code from mid-code with –1dBFS sinusoid from ideal mid-code (2048). Offset error is
expressed in terms of % of full-scale.
(2) If the offset at temperatures T1 and T2 are O1 and O2, respectively (where O1 and O2 are measured in LSBs), the offset temperature
coefficient in ppm/°C is calculated as (O1 – O2)/(T1 – T2) × 1E6/4096.
(3) Fixed attenuation in the channel arises because of a fixed attenuation in the sample-and-hold amplifier. When the differential voltage at
the analog input pins is changed from –VREF to +VREF, the swing of the output code is expected to deviate from the full-scale code
(4096LSB) by the extent of this fixed attenuation. NOTE: VREF is defined as (REFT – REFB).
(4) The reference voltages are trimmed at production so that (VREFT – VREFB) is within ± 35mV of the ideal value of 1V. This specification
does not include fixed attenuation.
(5) Supply current can be calculated from dividing the power dissipation by the supply voltage of 3.3V.
(6) The VCM output current specified is the drive of the VCM buffer if loaded externally.
(7) Average current drawn from the reference pins in the external reference mode.
4
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