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ADS4229 bảng dữ liệu(PDF) 4 Page - Texas Instruments

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ADS4229
SBAS550B – JUNE 2011 – REVISED AUGUST 2012
www.ti.com
RECOMMENDED OPERATING CONDITIONS
Over operating free-air temperature range, unless otherwise noted.
ADS4229
PARAMETER
MIN
NOM
MAX
UNIT
SUPPLIES
Analog supply voltage, AVDD
1.7
1.8
1.9
V
Digital supply voltage, DRVDD
1.7
1.8
1.9
V
ANALOG INPUTS
Differential input voltage range
2
VPP
Input common-mode voltage
VCM ± 0.05
V
Maximum analog input frequency with 2-VPP input amplitude
(1)
400
MHz
Maximum analog input frequency with 1-VPP input amplitude
(1)
600
MHz
CLOCK INPUT
Input clock sample rate
Low-speed mode enabled(2)
1
80
MSPS
Low-speed mode disabled(2) (by default after reset)
80
250
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
1.5
V
Input clock duty cycle
Low-speed mode disabled
35
50
65
%
Low-speed mode enabled
40
50
60
%
DIGITAL OUTPUTS
Maximum external load capacitance from each output pin to DRGND, CLOAD
5
pF
Differential load resistance between the LVDS output pairs (LVDS mode), RLOAD
100
Ω
Operating free-air temperature, TA
–40
+85
°C
(1)
See the Theory of Operation section in the Application Information.
(2)
See the Serial Interface Configuration section for details on programming the low-speed mode.
HIGH-PERFORMANCE MODES(1)(2)
PARAMETER
DESCRIPTION
Set the HIGH PERF MODE[2:1] register bit to obtain best performance across sample clock and input signal
High-performance mode
frequencies.
Register address = 03h, data = 03h
Set the HIGH FREQ MODE CH A and HIGH FREQ MODE CH B register bits for high input signal frequencies
greater than 200 MHz.
High-frequency mode
Register address = 4Ah, data = 01h
Register address = 58h, data = 01h
Set the HIGH PERF MODE[2:7] bits to obtain best performance across input signal frequencies for sampling
rates greater than 160 MSPS.
Note that this mode changes VCM to 0.87 V from its default value of 0.95 V.
High-speed mode
Register address = 2h, data = 40h
Register address = D5h, data = 18h
Register address = D7h, data = 0Ch
Register address = DBh, data = 20h
(1)
It is recommended to use these modes to obtain best performance.
(2)
See the Serial Interface Configuration section for details on register programming.
4
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Copyright © 2011–2012, Texas Instruments Incorporated
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