AD9287 Analog Devices, AD9287 Datasheet - Page 24

• Manufacturer Part Number: AD9287
• Description: Quad, 8-Bit, 100 MSPS Serial LVDS 1.8 V A/D Converter
• Manufacturer: Analog Devices

Specifications of AD9287

• Resolution (bits): 8bit
• # Chan: 4
• Sample Rate: 100MSPS
• Interface: LVDS,Ser
• Analog Input Type: Diff-Uni
• Ain Range: 2 V p-p
• Adc Architecture: Pipelined
• Pkg Type: CSP

AD9287
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
Greater than 24 Inches on Standard FR-4, External 100 Ω Far Termination Only
Figure 51. Data Eye for LVDS Outputs in ANSI-644 Mode with Trace Lengths
–500
–200
500
100
200
100
–100ps
–150ps
50
50
0
0
0
0
–1.0ns
–1.0ns
EYE: ALL BITS
EYE: ALL BITS
–100ps
–0.5ns
–0.5ns
–50ps
0ps
0ns
0ps
0ns
50ps
ULS: 10000/15600
0.5ns
ULS: 9600/15600
0.5ns
100ps
1.0ns
1.0ns
100ps
150ps
Rev. E | Page 24 of 52
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
255
128
127
0
Data from each ADC is serialized and provided on a separate
channel. The data rate for each serial stream is equal to 8 bits
times the sample clock rate, with a maximum of 800 Mbps
(8 bits × 100 MSPS = 800 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.
Termination on and Trace Lengths Greater than 24 Inches on Standard FR-4,
Figure 52. Data Eye for LVDS Outputs in ANSI-644 Mode with 100 Ω Internal
–200
–400
(VIN + x) − (VIN − x),
Input Span = 2 V p-p (V)
+1.00
0.00
−0.007813
−1.00
400
200
100
–150ps
50
0
0
–1.0ns
EYE: ALL BITS
–100ps
External 100 Ω Far Termination Only
–0.5ns
–50ps
0ps
0ns
Digital Output Offset Binary
(D7 ... D0)
1111 1111
1000 0000
0111 1111
0000 0000
50ps
ULS: 9599/15599
0.5ns
100ps
Data Sheet
1.0ns
150ps