參數(shù)資料
型號(hào): AD9228
廠商: Analog Devices, Inc.
英文描述: Quad, 12-bit, 40/65 MSPS Serial LVDS 1.8 V A/D Converter
中文描述: 四,12位,六十五分之四十○MSPS的串行LVDS 1.8弗吉尼亞州/ D轉(zhuǎn)換器
文件頁數(shù): 24/52頁
文件大?。?/td> 1659K
代理商: AD9228
AD9228
Rev. 0 | Page 24 of 52
0
100
50
–0
–0ps
100ps
T
500
–500
0
–1ns
–0.5ns
0ns
0.5ns
1ns
E
EYE: ALL BITS
ULS: 10000/15600
Figure 59. Data Eye for LVDS Outputs in ANSI Mode with Trace Lengths Less
than 24 Inches on Standard FR-4
0
200
–200
0
–1ns
–0.5ns
0ns
0.5ns
1ns
E
EYE: ALL BITS
ULS: 9600/15600
100
50
–0
–100ps
–50ps
–0ps
50ps
100ps
150ps
T
Figure 60. Data Eye for LVDS Outputs in ANSI Mode with Trace Lengths
Greater than 24 Inches on Standard FR-4
100
50
–0
–100ps
–50ps
–0ps
50ps
100ps
150ps
T
0
200
400
–200
–400
0
–1ns
–0.5ns
0ns
0.5ns
1ns
E
EYE: ALL BITS
ULS: 9599/15599
Figure 61. Data Eye for LVDS Outputs in ANSI Mode with 100 Ω Termination
on and Trace Lengths Greater than 24 Inches on Standard FR-4
The format of the output data is offset binary by default. An
example of the output coding format can be found in Table 8.
If it is desired to change the output data format to twos
complement, see the Memory Map section.
Table 8. Digital Output Coding
(VIN+) (VIN), Input
Span = 2 V p-p (V)
4095
+1.00
2048
0.00
2047
0.000488
0
1.00
Code
Digital Output Offset Binary
(D11 ... D0)
1111 1111 1111
1000 0000 0000
0111 1111 1111
0000 0000 0000
Data from each ADC is serialized and provided on a separate
channel. The data rate for each serial stream is equal to 12 bits
times the sample clock rate, with a maximum of 780 Mbps
(12 bits × 65 MSPS = 780 Mbps). The lowest typical conversion
rate is 10 MSPS. However, if lower sample rates are required for
a specific application, the PLL can be set up for encode rates
lower than 10 MSPS via the SPI. This allows encode rates as low
as 5 MSPS. See the Memory Map section to enable this feature.
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