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ADS5242 Datasheet(Fiches technique) 5 Page - Texas Instruments

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Numéro de pièce ADS5242
Description  4-Channel, 12-Bit, 65MSPS Analog-to-Digital Converter with Serial LVDS Interface
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
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ADS5242
SBAS330C – OCTOBER 2004 – REVISED OCTOBER 2005
ELECTRICAL CHARACTERISTICS (continued)
T
MIN = –40°C and TMAX = +85°C. Typical values are at TA = +25°C, clock frequency = maximum specified, 50% clock duty
cycle, AVDD = 3.3V, LVDD = 3.3V, –1dBFS, I
SET = 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.
ADS5242
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
ANALOG INPUT
Differential Input Capacitance
4.0
pF
Analog Input Common-Mode Range
VCM ± 50
mV
Differential Input Voltage Range
Internal Reference
2.03
VPP
External Reference
2.03
× (VREF
T – VREFB)
VPP
Voltage Overload Recovery Time(7)
3.0
CLK Cycles
–3dBFS, 25
Ω Series
Input Bandwidth
300
MHz
Resistances
DIGITAL DATA INPUTS
VIH High-Level Input Voltage
2.2
V
VIL Low-Level Input Voltage
0.6
V
CIN Input Capacitance
3.0
pF
DIGITAL DATA OUTPUTS
Data Format
Straight Offset Binary
Data Bit Rate
240
780
Mbps
SERIAL INTERFACE
SCLK Serial Clock Input Frequency
20
MHz
(7)
A differential ON/OFF pulse is applied to the ADC input. The differential amplitude of the pulse in its ON (high) state is twice the
full-scale range of the ADC, while the differential amplitude of the pulse in its OFF (low) state is zero. The overload recovery time of the
ADC is measured as the time required by the ADC output code to settle within 1% of full-scale, as measured from its mid-code value
when the pulse is switched from ON (high) to OFF (low).
REFERENCE SELECTION
MODE
INT/EXT
DESCRIPTION
Internal Reference; FSR = 2.03VPP
1
Default with internal pull-up.
Internal reference is powered down. The common-mode voltage
External Reference; FSR = 2.03
× (VREF
T – VREFB)
0
of the external reference should be within 50mV of VCM. VCM is
derived from the internal bandgap voltage.
5




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