参数资料
型号: AD9524/PCBZ
厂商: Analog Devices Inc
文件页数: 42/56页
文件大小: 0K
描述: BOARD EVAL FOR AD9524
设计资源: AD9524 Schematic
AD9524 BOM
AD9524 Gerber Files
标准包装: 1
主要目的: 计时,时钟发生器
嵌入式:
已用 IC / 零件: AD9524
主要属性: USB 供电或外部电源
次要属性: 状态 LED
已供物品:
配用: AD9524BCPZ-ND - IC INTEGER-N CLCK GEN 48LFCSP
Data Sheet
AD9524
Rev. E | Page 47 of 56
Output PLL (PLL2) (Address 0x0F0 to Address 0x0F9)
Table 45. PLL2 Charge Pump Control
Table 46. PLL2 Feedback N Divider Control
Table 47. PLL2 Control
Address
Bits
Bit Name
Description
0x0F2
7
PLL2 lock detector power-down
Controls power-down of the PLL2 lock detector.
1: lock detector powered down.
0: lock detector active.
6
Reserved
Default = 0; value must remain 0.
5
Enable frequency doubler
Enables doubling of the PLL2 reference input frequency.
1: enabled.
0: disabled.
4
Enable SPI control of antibacklash
pulse width
Controls the functionality of Register 0x0F2, Bits[3:2]. Set the antibacklash pulse
width to the minimum setting. By setting Bit 4 to 1 from the default of 0, Bits[3:2]
consequently default to 00.
0 (default): device automatically controls the antibacklash period to high
(equivalent to Register 0x0F2, Bits[3:2] = 10).
1: antibacklash period defined by Register 0x0F2, Bits[2:1] (recommended setting).
[3:2]
Antibacklash pulse width control
Controls the PFD antibacklash period of PLL2.
00 (default): minimum (recommended setting).
01: low.
10: high.
11: maximum.
These bits are ineffective unless Register 0x0F2, Bit 4 = 1.
[1:0]
PLL2 charge pump mode
Controls the mode of the PLL2 charge pump.
00: tristate.
01: pump up.
10: pump down.
11 (default): normal.
Address
Bits
Bit Name
Description
0x0F0
[7:0]
PLL2 charge pump control
These bits set the magnitude of the PLL2 charge pump current. Granularity is ~3.5 μA
with a full-scale magnitude of ~900 μA.
Address
Bits
Bit Name
Description
0x0F1
[7:6]
A counter
A counter word
[5:0]
B counter
B counter word
Feedback Divider Constraints
A Counter (Bits[7:6])
B Counter (Bits[5:0])
Allowed N Division (4 × B + A)
A = 0 or A = 1
B = 4
16, 17
A = 0 to A = 2
B = 5
20, 21, 22
A = 0 to A = 2
B = 6
24, 25, 26
A = 0 to A = 3
B ≥ 7
28, 29 … continuous to 255
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