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ADS5273 bảng dữ liệu(PDF) 4 Page - Texas Instruments

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Giải thích chi tiết về linh kiện  8-Channel, 12-Bit, 70MSPS Analog-to-Digital Converter
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ADS5273 bảng dữ liệu(HTML) 4 Page - Texas Instruments

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ELECTRICAL CHARACTERISTICS
ADS5273
SBAS305D – JANUARY 2004 – REVISED JANUARY 2009 .............................................................................................................................................. www.ti.com
TMIN = –40°C and TMAX = +85°C. Typical values are at TA = +25°C, clock frequency = 70MSPS, 50% clock duty cycle,
AVDD = 3.3V, LVDD = 3.3V, –1dBFS, ISET = 56.2kΩ, internal voltage reference, and LVDS buffer current at 3.5mA per
channel, unless otherwise noted. All values are applicable after the device has been reset.
ADS5273
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
DC ACCURACY
No Missing Codes
Tested
DNL Differential Nonlinearity
fIN = 5MHz
–0.99
±0.34
+1.2
LSB
INL Integral Nonlinearity
fIN = 5MHz
–3.0
±0.43
+3.0
LSB
Offset Error(1)
–0.75
+0.75
%FS
Offset Temperature Coefficient
±6
ppm/°C
Fixed Attenuation in Channel(2)
1.5
%FS
Fixed Attenuation Matching Across Channels
0.01
0.2
dB
Gain Error/Reference Error(3)
VREFT – VREFB
–2.5
±1.0
+2.5
%FS
Gain Error Temperature Coefficient
±20
ppm/°C
POWER REQUIREMENTS(4)
Internal Reference
Power Dissipation
Analog Only (AVDD)
800
868
mW
Output Driver (LVDD)
203
231
mW
Total Power Dissipation
1003
1099
mW
External Reference
Power Dissipation
Analog Only (AVDD)
734
mW
Output Driver (LVDD)
203
mW
Total Power Dissipation
937
mW
Total Power-Down
Clock Running
95
149
mW
REFERENCE VOLTAGES
VREFT Reference Top (internal)
1.9
1.95
2.0
V
VREFB Reference Bottom (internal)
0.9
0.95
1.0
V
VCM Common-Mode Voltage
1.4
1.45
1.5
V
VCM Output Current
(5)
±50mV Change in Voltage
±2.0
mA
VREFT Reference Top (external)
1.825
1.95
2.0
V
VREFB Reference Bottom (external)
0.9
0.95
1.075
V
External Reference Common-Mode
VCM ± 50mV
V
External Reference Input Current(6)
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)
Fixed attenuation in the channel arises due to a fixed attenuation of about 1% in the sample-and-hold amplifier. When the differential
voltage at the analog input pins are 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).
(3)
The reference voltages are trimmed at production so that (VREFT – VREFB) is within ± 25mV of the ideal value of 1V. It does not include
fixed attenuation.
(4)
Supply current can be calculated from dividing the power dissipation by the supply voltage of 3.3V.
(5)
VCM provides the common-mode current for the inputs of all eight channels when the inputs are ac-coupled. The VCM output current
specified is the additional drive of the VCM buffer if loaded externally.
(6)
Average current drawn from the reference pins in the external reference mode.
4
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