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ADS4142 bảng dữ liệu(PDF) 4 Page - Texas Instruments

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ADS4128
SBAS578 – MAY 2012
www.ti.com
RECOMMENDED OPERATING CONDITIONS
Over operating free-air temperature range, unless otherwise noted.
ADS4128
MIN
TYP
MAX
UNIT
SUPPLIES
AVDD
Analog supply voltage
1.7
1.8
1.9
V
DRVDD
Digital supply voltage
1.7
1.8
1.9
V
ANALOG INPUTS
Differential input voltage range(1)
2
VPP
Input common-mode voltage
VCM ± 0.05
V
With 2-VPP input amplitude
(2)
400
MHz
Maximum analog input frequency
With 1-VPP input amplitude
(2)
800
MHz
CLOCK INPUT
Input clock sample rate
Enabled(3)
20
80
MSPS
Low-speed mode
Disabled(3)
> 80
200
MSPS
Sine wave, ac-coupled
0.2
1.5
VPP
LVPECL, ac-coupled
1.6
VPP
Input clock amplitude differential
(VCLKP – VCLKM)
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
Maximum external load capacitance from each
CLOAD
5
pF
output pin to DRGND
Differential load resistance between the LVDS
RLOAD
100
Ω
output pairs (LVDS mode)
TA
Operating free-air temperature
–40
+85
°C
(1)
With 0-dB gain. See the Fine Gain section in the Application Information for relation 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 low-speed mode.
Table 2. HIGH PERFORMANCE MODES(1)(2)(3)
MODE
DESCRIPTION
Set the MODE 1 register bits to get 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 best performance at high input signal frequencies.
Mode 2
Register address = 4Ah, register data = 01h
(1)
It is recommended to use these modes to get best performance. These modes can be set using the serial interface only.
(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.
4
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Copyright © 2012, Texas Instruments Incorporated
Product Folder Link(s): ADS4128


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