ADS5281_1 Datasheet, PDF (5/44 Pages) Texas Instruments – 12-Bit Octal-Channel ADC Family Up to 65MSPS

ADS5281
ADS5282
www.ti.com
SBAS397H – DECEMBER 2006 – REVISED MARCH 2008
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.
PARAMETER
INTERNAL REFERENCE VOLTAGES
V_REFB
Reference bottom
V_REFT
Reference top
V_REFT – V_REFB
V_CM
Common-mode voltage (internal)
V_CM output current
EXTERNAL REFERENCE VOLTAGES
V_REFB
Reference bottom
V_REFT
Reference top
V_REFT – V_REFB
ANALOG INPUT
Differential input voltage range
Differential input capacitance
Analog input bandwidth
Analog input common-mode range
Analog input common-mode current
Voltage overload recovery time
Voltage overload recovery repeatability
DC ACCURACY
Offset error
Offset error temperature coefficient⁽²⁾
Channel gain error
Channel gain error temperature
coefficient
Internal reference error temperature
coefficient ⁽³⁾
DC PSRR DC power-supply rejection ratio⁽⁴⁾
POWER-DOWN MODES
Power in complete power-down mode
Power in partial power-down mode
Power with no clock
DYNAMIC PERFORMANCE
Crosstalk
Two-tone, third-order intermodulation
distortion
TEST CONDITIONS
DC-coupled input
Per input pin per MSPS of sampling
speed
Recovery from 6dB overload to within 1%
accuracy
Standard deviation seen on a periodic
first data within full-scale range in a 6dB
overloaded sine wave
Excludes error in internal reference
Excludes temperature coefficient of
internal reference
Clock at 65MSPS
5MHz full-scale signal applied to seven
channels, measurement taken on channel
with no input signal
f₁ = 9.5MHz at –7dBFs
f₂ = 10.2MHz at –7dBFs
MIN
1.95
1.425
0.4
2.4
1.9
–1.25
ADS528x
TYP
0.5
2.5
2.0
1.5
±2
0.5
2.5
2.0
2.0
3
520
V_CM ± 0.05
2.5
1
1
±0.2
±5
–0.8
±10
±15
1.5
45
135
88
–90
–92
MAX
2.05
1.575
0.6
2.6
2.1
+1.25
UNIT
V
V
V
V
mA
V
V
V
V_PP
pF
MHz
V
µA/MHz
per pin
Clock cycle
LSB
%FS
ppm/°C
%FS
ppm/°C
ppm/°C
mV/V
mW
mW
mW
dBc
dBFS
(1) All characteristics are common for the ADS528x family.
(2) The offset temperature coefficient in ppm/°C is defined as (O₁ – O₂) × 10⁶/(T₁ – T₂)/4096, where O₁ and O₂ are the offset codes in LSB
at the two extreme temperatures, T₁ and T₂.
(3) The internal reference temperature coefficient is defined as (REF₁ – REF₂) × 10⁶/(T₁ – T₂)/2, where REF₁ and REF₂ are the internal
reference voltages (V_REFT – V_REFB) at the two extreme temperatures, T₁ and T₂.
(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).
Copyright © 2006–2008, Texas Instruments Incorporated
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