参数资料
型号: AD9551BCPZ
厂商: ANALOG DEVICES INC
元件分类: 时钟产生/分配
英文描述: 900 MHz, OTHER CLOCK GENERATOR, QCC40
封装: 6 X 6 MM, ROHS COMPLIANT, MO-220VJJD-2, LFCSP-40
文件页数: 29/40页
文件大小: 792K
代理商: AD9551BCPZ
AD9551
Rev. B | Page 35 of 40
Input Receiver and Band Gap (Register 0x1A)
Table 27.
Address
Bit
Bit Name
Description
0x1A
7
Receiver reset
Input receiver reset control. This is an autoclearing bit.
0 = normal operation (default).
1 = reset input receiver logic.
[6:2]
Band gap voltage adjust
Controls the band gap voltage setting from minimum (0 0000) to maximum (1 1111).
Default is 0 0000.
1
Enable receiver power-down
Controls the option to power down the REFA and/or REFB receiver via Register 0x26[4]
and Register 0x1E[4], respectively.
0 = option disabled (default).
1 = option enabled.
0
Enable SPI control of band gap
voltage
Enables functionality of Bits[6:2].
0 = the device automatically selects receiver band gap voltage (default).
1 = Bits[6:2] define the receiver band gap voltage.
DCXO Control (Register 0x1B to Register 0x1D)
Table 28.
Address
Bit
Bit Name
Description
0x1B
7
Disable SPI control of DCXO
tuning capacitor
Disables functionality of Bits[5:0].
0 = tuning capacitance defined by Bits[5:0].
1 = the device automatically selects DCXO tuning capacitance (default).
6
Enable SPI control of DCXO
varactor
Enables functionality of Register 0x1C and Register 0x1D[7:3].
0 = the device automatically selects DCXO varactor (default).
1 = varactor defined by Register 0x1C[7:0] and Register 0x1D[7:3].
[5:0]
DCXO tuning capacitor control
Higher binary values correspond to smaller total capacitance, resulting in a higher
operating frequency. Default is 00 0000.
0x1C
[7:0]
DCXO varactor control
Bits[12:5] of the 13-bit varactor control word.
0x1D
[7:3]
DCXO varactor control
Bits[4:0] of the 13-bit varactor control word. The default varactor control word is
0 0000 0000 0000.
2
Select 2× frequency multiplier
Select/bypass the 2× frequency multiplier.
0 = bypassed (default).
1 = selected.
1
DCXO bypass
Select/bypass the DCXO.
0 = selected (default).
1 = bypassed.
0
Unused
Unused.
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