参数资料
型号: AD9609-20EBZ
厂商: Analog Devices Inc
文件页数: 13/32页
文件大小: 0K
描述: BOARD EVALUATION AD9609 20MSPS
设计资源: AD9649/29/09 Schematics
AD9649/29/09 Gerber Files
标准包装: 1
ADC 的数量: 1
位数: 10
采样率(每秒): 20M
数据接口: 串行,SPI?
输入范围: 2 Vpp
在以下条件下的电源(标准): 46.3mW @ 20MSPS
工作温度: -40°C ~ 85°C
已用 IC / 零件: AD9609
已供物品:
AD9609
Rev. 0 | Page 20 of 32
CLOCK INPUT CONSIDERATIONS
For optimum performance, clock the AD9609 sample clock
inputs, CLK+ and CLK, with a differential signal. The signal
is typically ac-coupled into the CLK+ and CLK pins via a
transformer or capacitors. These pins are biased internally
(see Figure 45) and require no external bias.
0.9V
AVDD
2pF
CLK–
CLK+
08
54
1-
0
16
Figure 45. Equivalent Clock Input Circuit
Clock Input Options
The AD9609 has a very flexible clock input structure. The clock
input can be a CMOS, LVDS, LVPECL, or sine wave signal.
Regardless of the type of signal being used, clock source jitter is
of great concern, as described in the Jitter Considerations section.
Figure 46 and Figure 47 show two preferred methods for clock-
ing the AD9609 (at clock rates up to 625 MHz). A low jitter clock
source is converted from a single-ended signal to a differential
signal using either an RF transformer or an RF balun.
The RF balun configuration is recommended for clock frequencies
between 125 MHz and 625 MHz, and the RF transformer is
recommended for clock frequencies from 10 MHz to 200 MHz.
The back-to-back Schottky diodes across the transformer/
balun secondary limit clock excursions into the AD9609 to
approximately 0.8 V p-p differential.
This limit helps prevent the large voltage swings of the clock
from feeding through to other portions of the AD9609 while
preserving the fast rise and fall times of the signal that are
critical to a low jitter performance.
0.1F
SCHOTTKY
DIODES:
HSMS2822
CLOCK
INPUT
50
100
CLK–
CLK+
ADC
Mini-Circuits
ADT1-1WT, 1:1 Z
XFMR
08
54
1-
0
17
Figure 46. Transformer-Coupled Differential Clock (Up to 200 MHz)
0.1F
1nF
CLOCK
INPUT
1nF
50
CLK–
CLK+
SCHOTTKY
DIODES:
HSMS2822
ADC
08
54
1-
01
8
Figure 47. Balun-Coupled Differential Clock (Up to 625 MHz)
If a low jitter clock source is not available, another option is to
ac couple a differential PECL signal to the sample clock input
pins, as shown in Figure 48. The AD9510/AD9511/AD9512/
excellent jitter performance.
100
0.1F
240
240
50k
50k
CLK–
CLK+
CLOCK
INPUT
CLOCK
INPUT
ADC
AD951x
PECL DRIVER
0
854
1-
01
9
Figure 48. Differential PECL Sample Clock (Up to 625 MHz)
A third option is to ac couple a differential LVDS signal to the
sample clock input pins, as shown in Figure 49. The AD9510/
clock drivers offer excellent jitter performance.
100
0.1F
50k
50k
CLK–
CLK+
ADC
CLOCK
INPUT
CLOCK
INPUT
AD951x
LVDS DRIVER
0
854
1-
020
Figure 49. Differential LVDS Sample Clock (Up to 625 MHz)
In some applications, it may be acceptable to drive the sample
clock inputs with a single-ended 1.8 V CMOS signal. In such
applications, drive the CLK+ pin directly from a CMOS gate, and
bypass the CLK pin to ground with a 0.1 μF capacitor (see
OPTIONAL
100
0.1F
50
1
150
RESISTOR IS OPTIONAL.
CLK–
CLK+
ADC
VCC
1k
1k
CLOCK
INPUT
AD951x
CMOS DRIVER
08
54
1-
02
1
Figure 50. Single-Ended 1.8 V CMOS Input Clock (Up to 200 MHz)
Input Clock Divider
The AD9609 contains an input clock divider with the ability
to divide the input clock by integer values between 1 and 8.
Optimum performance can be obtained by enabling the inter-
nal duty cycle stabilizer (DCS) when using divide ratios other
than 1, 2, or 4.
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