Datasheet

ADS5272
www.ti.com ...................................................................................................................................................... SBAS324C – JUNE 2004 – REVISED JANUARY 2009
ELECTRICAL CHARACTERISTICS (continued)
T
MIN
= – 40 ° C and T
MAX
= +85 ° C. Typical values are at T
A
= +25 ° C, clock frequency = maximum specified, 50% clock duty
cycle, AVDD = 3.3V, LVDD = 3.3V, – 1dBFS, I
SET
= 56.2k Ω , 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.
ADS5272
PARAMETER TEST CONDITIONS MIN TYP MAX UNITS
ANALOG INPUT
Differential Input Capacitance 4.0 pF
Analog Input Common-Mode Range V
CM
± 50 mV
Differential Full-Scale Input Voltage Range Internal Reference 2.03 V
PP
External Reference 2.03 × (VREF
T
– VREF
B
) V
PP
Voltage Overhead Recovery Time
(7)
3.0 CLK Cycles
– 3dBFS, 25 Ω Series
Input Bandwidth 300 MHz
Resistances
DIGITAL DATA INPUTS
V
IH
High-Level Input Voltage 2.2 V
V
IL
Low-Level Input Voltage 0.6 V
C
IN
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 = 2.03V
PP
1 Default with internal pull-up.
Internal reference is powered down. The common-mode voltage of
External Reference; FSR = 2.03x (REF
T
– REF
B
) 0 the external reference should be within 50mV of V
CM
. V
CM
is
derived from the internal bandgap voltage.
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