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| 型号： | AD9523-1/PCBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 15/60页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR AD9523-1 |
| 设计资源： | AD9523(-1) Eval Board Schematic AD9523(-1) BOM AD9523(-1) Gerber Files |
| 标准包装： | 1 |
| 主要目的： | 计时，时钟发生器 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | AD9523 |
| 主要属性： | 板载 PLL 环路滤波器 |
| 次要属性： | LED 状态指示器 |
| 已供物品： | 板 |
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AD9523-1
Rev. B | Page 22 of 60
COMPONENT BLOCKS—INPUT PLL (PLL1)
PLL1 General Description
Fundamentally, the input PLL (referred to as PLL1) consists of
a phase-frequency detector (PFD), charge pump, passive loop filter,
and an external VCXO operating in a closed loop (see Figure 26).
PLL1 has the flexibility to operate with a loop bandwidth of
approximately 10 Hz to 100 Hz. This relatively narrow loop
bandwidth gives the AD9523-1 the ability to suppress jitter that
appears on the input references (REFA and REFB). The output
of PLL1 then becomes a low jitter phase-locked version of the
reference input system clock.
PLL1 Reference Clock Inputs
The AD9523-1 features two separate differential reference clock
inputs, REFA and REFB. These inputs can be configured to
operate in full differential mode or single-ended CMOS mode.
In differential mode, these pins are internally self-biased. If
REFA or REFB is driven single-ended, the unused side (REFA,
REFB) should be decoupled via a suitable capacitor to a quiet
ground.
shows the equivalent circuit of REFA or REFB.
It is possible to dc-couple to these inputs, but the dc operation
point should be set as specified in the
tables.
To operate either the REFA input or the REFB input in 3.3 V
CMOS mode, the user must set Bit 5 or Bit 6, respectively, in
Register 0x01A (see Table 40). The single-ended inputs can be
driven by either a dc-coupled CMOS level signal or an ac-coupled
sine wave or square wave.
The differential reference input receiver is powered down when
the differential reference input is not selected, or when the PLL
is powered down. The single-ended buffers power down when
the PLL is powered down, when their respective individual power-
down registers are set, or when the differential receiver is selected.
The REFB R divider uses the same value as the REFA R divider
unless Bit 7, the enable REFB R divider independent division
control bit in Register 0x01C, is programmed as shown in Table 42.
PLL1 Loop Filter
The PLL1 loop filter requires the connection of an external
capacitor from LF1_EXT_CAP (Pin 7) to ground. The value of the
external capacitor depends on the use of an external VCXO and
the configuration parameters, such as input clock rate and desired
bandwidth. Normally, a 0.3 μF capacitor allows the loop bandwidth
to range from 10 Hz to 100 Hz and ensures loop stability over
the intended operating parameters of the device (see Table 43 for
RZERO values).
RZERO
CPOLE1
RPOLE2
CPOLE2
CHARGE
PUMP
LF1_EXT_CAP
LDO_PLL1
BUFFER
1k
0.3F
OSC_CTRL
AD9523-1
09278-
022
Figure 25. PLL1 Loop Filter
Table 19. PLL1 Loop Filter Programmable Values
RZERO
(kΩ)
CPOLE1
(nF)
RPOLE2
(kΩ)
CPOLE2
(nF)
(μF)
883
1.5 fixed
165 fixed
0.337 fixed
0.3
677
341
135
10
External
1 External loop filter capacitor.
An external R-C low-pass filter should be used at the OSC_CTRL
output. The values shown in Figure 25 add an additional low-pass
pole at ~530 Hz. This R-C network filters the noise associated with
the OSC_CTRL buffer to achieve the best noise performance at the
1 kHz offset region.
RZERO
CPOLE1
RPOLE2
LF1_EXT_CAP
SWITCH-
OVER
CONTROL
REFA
REFB
REFA
REFB
REF_SEL
REF_TEST
DIVIDE-BY-
1, 2, ...1023
CHARGE
PUMP
7 BITS,
0.5A LSB
VDD3_PLL
LDO_PLL1
1.8V LDO
3.3V CMOS
OR 1.8V
DIFFERENTIAL
OSC_CTRL
OSC_IN
DIVIDE-BY-
1, 2, ...1023
DIVIDE-BY-
1, 2, ...1023
DIVIDE-BY-
1, 2, ...63
P
F
D
VCXO
CPOLE2
AD9523-1
092
78
-021
Figure 26. Input PLL (PLL1) Block Diagram
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