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ADS5281 bảng dữ liệu(PDF) 5 Page - Texas Instruments

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Giải thích chi tiết về linh kiện  12-Bit Octal-Channel ADC Family Up to 65MSPS
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ADS5281 bảng dữ liệu(HTML) 5 Page - Texas Instruments

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ELECTRICAL CHARACTERISTICS
(1)
ADS5281
ADS5282
SBAS397H – DECEMBER 2006 – REVISED MARCH 2008
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, ISET resistor = 56.2kΩ, and LVDS buffer current setting = 3.5mA, unless
otherwise noted.
ADS528x
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
INTERNAL REFERENCE VOLTAGES
VREFB
Reference bottom
0.5
V
VREFT
Reference top
2.5
V
VREFT – VREFB
1.95
2.0
2.05
V
VCM
Common-mode voltage (internal)
1.425
1.5
1.575
V
VCM output current
±2
mA
EXTERNAL REFERENCE VOLTAGES
VREFB
Reference bottom
0.4
0.5
0.6
V
VREFT
Reference top
2.4
2.5
2.6
V
VREFT – VREFB
1.9
2.0
2.1
V
ANALOG INPUT
Differential input voltage range
2.0
VPP
Differential input capacitance
3
pF
Analog input bandwidth
520
MHz
Analog input common-mode range
DC-coupled input
VCM ± 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
f1 = 9.5MHz at –7dBFs
–92
dBFS
distortion
f2 = 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 – O2) × 10
6/(T
1 – 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) × 10
6/(T
1 – T2)/2, where REF1 and REF2 are the internal
reference voltages (VREFT – VREFB) 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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Product Folder Link(s): ADS5281 ADS5282


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