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AD9259 Datasheet(PDF) 25 Page - Analog Devices

Part # AD9259
Description  Serial LVDS 1.8 V ADC
PDF  53 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD9259 Datasheet(HTML) 25 Page - Analog Devices

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AD9259
Data Sheet
Rev. E | Page 24 of 52
100
50
0
–100ps
0ps
100ps
500
–500
0
–1.0ns
–0.5ns
0ns
0.5ns
1.0ns
EYE: ALL BITS
ULS: 10000/15600
0
Figure 50. Data Eye for LVDS Outputs in ANSI-644 Mode with Trace Lengths
Less than 24 Inches on Standard FR-4, External 100 Ω Far Termination Only
200
–200
0
–1.0ns
–0.5ns
0ns
0.5ns
1.0ns
EYE: ALL BITS
ULS: 9600/15600
100
50
0
–150ps
–100ps
–50ps
0ps
50ps
100ps
150ps
Figure 51. Data Eye for LVDS Outputs in ANSI-644 Mode with Trace Lengths
Greater than 24 Inches on Standard FR-4, External 100 Ω Far Termination Only
100
50
0
–150ps
–100ps
–50ps
0ps
50ps
100ps
150ps
200
400
–200
–400
0
–1.0ns
–0.5ns
0ns
0.5ns
1.0ns
EYE: ALL BITS
ULS: 9599/15599
Figure 52. Data Eye for LVDS Outputs in ANSI-644 Mode with 100 Ω Internal
Termination on and Trace Lengths Greater than 24 Inches on Standard FR-4,
External 100 Ω Far Termination Only
The format of the output data is offset binary by default. An
example of the output coding format can be found in Table 8.
To change the output data format to twos complement, see the
Memory Map section.
Table 8. Digital Output Coding
Code
(VIN + x) − (VIN − x),
Input Span = 2 V p-p (V)
Digital Output Offset Binary
(D13 ... D0)
16383
+1.00
11 1111 1111 1111
8192
0.00
10 0000 0000 0000
8191
−0.000122
01 1111 1111 1111
0
−1.00
00 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 14 bits
times the sample clock rate, with a maximum of 700 Mbps
(14 bits × 50 MSPS = 700 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 via the SPI to allow
encode rates as low as 5 MSPS. See the Memory Map section for
details on enabling this feature.



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