ADS41B25
www.ti.com
SBAS548
– JUNE 2011
RECOMMENDED OPERATING CONDITIONS
ADS41B25
MIN
TYP
MAX
UNIT
SUPPLIES
AVDD
Analog supply voltage
1.7
1.8
1.9
V
AVDD_BUF
Analog buffer supply voltage
3
3.3
3.6
V
DRVDD
Digital supply voltage
1.7
1.8
1.9
V
ANALOG INPUTS
Differential input voltage range(1)
1.5
VPP
Input common-mode voltage
1.7
± 0.05
V
Maximum analog input frequency with 1.5VPP input amplitude
(2)
400
MHz
Maximum analog input frequency with 1VPP input amplitude
(2)
600
MHz
CLOCK INPUT
Low-speed mode enabled(3)
20
80
MSPS
Low-speed mode disabled(3)
80
125
MSPS
Input clock amplitude differential (VCLKP – VCLKM)
Sine wave, ac-coupled
0.2
1.5
VPP
LVPECL, ac-coupled
1.6
VPP
LVDS, ac-coupled
0.7
VPP
LVCMOS, single-ended, ac-coupled
1.8
V
Low-speed mode enabled
40
50
60
%
Input clock duty
cycle
Low-speed mode disabled
35
50
65
%
DIGITAL OUTPUTS
CLOAD
Maximum external load capacitance from each output pin to DRGND
5
pF
Differential load resistance between the LVDS output pairs
RLOAD
100
Ω
(LVDS mode)
TA
Operating free-air temperature
–40
+85
°C
(1)
With 0dB gain. See the Gain for SFDR/SNR Trade-Off section in Application Information for the relationship between input voltage range
and gain.
(2)
See the Theory of Operation section in the Application Information.
(3)
See the Serial Interface section for details on the low-speed mode.
HIGH-PERFORMANCE MODES(1)(2)(3)
PARAMETER
DESCRIPTION
Set the MODE 1 register bits to get the best performance across sample clock and input signal frequencies.
MODE 1
Register address = 03h, register data = 03h.
Set the MODE 2 register bit to get the best performance at high input signal frequencies greater than 230MHz.
MODE 2
Register address = 4Ah, register data = 01h.
(1)
It is recommended to use these modes to get best performance. These modes can only be set with the serial interface.
(2)
See the Serial Interface section for details on register programming.
(3)
Note that these modes cannot be set when the serial interface is not used (when the RESET pin is tied high); see the Device
Configuration section.
Copyright
© 2011, Texas Instruments Incorporated
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