Datasheet
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RECOMMENDED OPERATING CONDITIONS
ELECTRICAL CHARACTERISTICS
ADS6245 , ADS6244
ADS6243 , ADS6242
SLAS542A – MAY 2007 – REVISED JULY 2007
over operating free-air temperature range (unless otherwise noted)
MIN NOM MAX UNIT
SUPPLIES
AVDD Analog supply voltage 3.0 3.3 3.6 V
LVDD LVDS Buffer supply voltage 3.0 3.3 3.6 V
ANALOG INPUTS
Differential input voltage range 2 V
pp
1.5
Input common-mode voltage V
± 0.1
Voltage applied on VCM in external reference mode 1.45 1.50 1.55 V
CLOCK INPUT
ADS6245 5 125
ADS6244 5 105
Input clock sample rate, F
s
MSPS
ADS6243 5 80
ADS6242 5 65
Sine wave, ac-coupled 0.4 1.5
LVPECL, ac-coupled ± 0.8
Input clock amplitude differential (V
CLKP
– V
CLKM
) V
pp
LVDS, ac-coupled ± 0.35
LVCMOS, ac-coupled 3.3
Input Clock duty cycle 35% 50% 65%
DIGITAL OUTPUTS
Without internal termination 5
Maximum external load capacitance from each
C
LOAD
pF
output pin to DGND
With internal termination 10
R
LOAD
Differential load resistance (external) between the LVDS output pairs 100 Ω
T
A
Operating free-air temperature – 40 85 ° C
Typical values are at 25 ° C, min and max values are across the full temperature range T
MIN
= – 40 ° C to T
MAX
= 85 ° C, AVDD =
LVDD = 3.3 V, maximum rated sampling frequency, 50% clock duty cycle, – 1dBFS differential analog input, internal reference
mode (unless otherwise noted).
ADS6245 ADS6244 ADS6243 ADS6242
F
s
= 125 MSPS F
s
= 105 MSPS F
s
= 80 MSPS F
s
= 65 MSPS
PARAMETER UNIT
MIN TYP MAX MIN TYP MAX MIN TYP MAX MIN TYP MAX
RESOLUTION 14 14 14 14 Bits
ANALOG INPUT
Differential input voltage 2.0 2.0 2.0 2.0 V
PP
range
Differential input 7 7 7 7 pF
capacitance
Analog input bandwidth 500 500 500 500 MHz
Analog input common mode 155 130 100 81 μ A
current (per input pin of
each ADC)
REFERENCE VOLTAGES
VREFB Internal reference bottom 1.0 1.0 1.0 1.0 V
voltage
VREFT Internal reference top 2.0 2.0 2.0 2.0 V
voltage
Δ V
REF
Internal reference error, – 15 ± 2 15 – 15 ± 2 15 – 15 ± 2 15 – 15 ± 2 15 mV
(VREFT – VREFB)
VCM Common mode output 1.5 1.5 1.5 1.5 V
voltage
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Product Folder Link(s): ADS6245 ADS6244 ADS6243 ADS6242