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参数资料
| 型号： | AD9219-65EBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 21/56页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION FOR AD9219 |
| 设计资源： | AD9219/28/59/87 Gerber Files |
| 标准包装： | 1 |
| ADC 的数量： | 4 |
| 位数： | 10 |
| 采样率（每秒）： | 40M |
| 数据接口： | 串行 |
| 输入范围： | 2 Vpp |
| 在以下条件下的电源（标准）： | 378mW @ 1.8V |
| 工作温度： | -40°C ~ 85°C |
| 已用 IC / 零件： | AD9219 |
| 已供物品： | 板 |
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AD9219
Data Sheet
Rev. E | Page 28 of 56
When the SPI is used, the DCO phase can be adjusted in 60°
increments relative to the data edge. This enables the user to
refine system timing margins if required. The default DCO+
and DCO timing, as shown in Figure 2, is 90° relative to the
output data edge.
An 8-, 12-, or 14-bit serial stream can also be initiated from the SPI.
This allows the user to implement and test compatibility with lower
and higher resolution systems. When changing the resolution to
a 12-bit serial stream, the data stream is lengthened. See Figure 3
for the 12-bit example. However, when using the 12-bit option,
the data stream stuffs two 0s at the end of the 12-bit serial data.
When the SPI is used, all of the data outputs can also be
inverted from their nominal state. This is not to be confused with
inverting the serial stream to an LSB-first mode. In default mode,
as shown in Figure 2, the MSB is first in the data output serial
stream. However, this can be inverted so that the LSB is first in the
data output serial stream (see Figure 4).
There are 12 digital output test pattern options available that
can be initiated through the SPI. This is a useful feature when
validating receiver capture and timing. Refer to Table 9 for the
output bit sequencing options available. Some test patterns have
two serial sequential words and can be alternated in various
ways, depending on the test pattern chosen. Note that some
patterns do not adhere to the data format select option. In
addition, custom user-defined test patterns can be assigned in
the 0x19, 0x1A, 0x1B, and 0x1C register addresses. All test mode
options except PN sequence short and PN sequence long can
support 8- to 14-bit word lengths in order to verify data capture
to the receiver.
The PN sequence short pattern produces a pseudorandom bit
sequence that repeats itself every 29 1 or 511 bits. A description
of the PN sequence and how it is generated can be found in
Section 5.1 of the ITU-T 0.150 (05/96) standard. The only
difference is that the starting value must be a specific value
instead of all 1s (see Table 10 for the initial values).
The PN sequence long pattern produces a pseudorandom bit
sequence that repeats itself every 223 1 or 8,388,607 bits. A
description of the PN sequence and how it is generated can be
found in Section 5.6 of the ITU-T 0.150 (05/96) standard. The
only differences are that the starting value must be a specific
value instead of all 1s (see Table 10 for the initial values) and the
AD9219 inverts the bit stream with relation to the ITU standard.
Table 10. PN Sequence
Sequence
Initial
Value
First Three Output Samples
(MSB First)
PN Sequence Short
0x0df
0x37e, 0x135, 0x0cc
PN Sequence Long
0x0a6e02
0x359, 0x07f, 0x170
Consult the Memory Map section for information on how to
change these additional digital output timing features through
the SPI.
SDIO/ODM Pin
The SDIO/ODM pin is for use in applications that do not require
SPI mode operation. This pin can enable a low power, reduced
signal option (similar to the IEEE 1596.3 reduced range link
output standard) if it and the CSB pin are tied to AVDD during
device power-up. This option should only be used when the
digital output trace lengths are less than 2 inches from the LVDS
receiver. When this option is used, the FCO, DCO, and outputs
function normally, but the LVDS signal swing of all channels is
reduced from 350 mV p-p to 200 mV p-p, allowing the user to
further reduce the power on the DRVDD supply.
For applications where this pin is not used, it should be tied low.
In this case, the device pin can be left open, and the 30 kΩ internal
pull-down resistor pulls this pin low. This pin is only 1.8 V tolerant.
If applications require this pin to be driven from a 3.3 V logic level,
insert a 1 kΩ resistor in series with this pin to limit the current.
Table 11. Output Driver Mode Pin Settings
Selected ODM
ODM Voltage
Resulting
Output Standard
Resulting
FCO and DCO
Normal
Operation
10 kΩ to AGND
ANSI-644
(default)
ANSI-644
(default)
ODM
AVDD
Low power,
reduced
signal option
Low power,
reduced
signal option
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