参数资料
型号: LTC6946IUFD-2#PBF
厂商: Linear Technology
文件页数: 10/30页
文件大小: 0K
描述: IC INTEGER-N PLL W/VCO 28-QFN
软件下载: PLLWizard™
PLLWizard™, with .NET 2.0 installer
标准包装: 73
类型: 时钟/频率合成器(RF/IF),分数-N,整数-N,
PLL:
输入: 时钟
输出: 时钟
电路数: 1
比率 - 输入:输出: 1:1
差分 - 输入:输出: 是/是
频率 - 最大: 4.91GHz
除法器/乘法器: 是/是
电源电压: 3.15 V ~ 5.25 V
工作温度: -40°C ~ 105°C
安装类型: 表面贴装
封装/外壳: 28-WFQFN 裸露焊盘
供应商设备封装: 28-QFN(4x5)
包装: 管件
LTC6946
18
6946fa
OPERATION
Multiple Byte Transfers
More efficient data transfer of multiple bytes is accom-
plished by using the LTC6946’s register address auto-
increment feature as shown in Figure 12. The serial port
master sends the destination register address in the first
byte and its data in the second byte as before, but continues
sending bytes destined for subsequent registers. Byte 1’s
address is Addr0+1, Byte 2’s address is Addr0+2, and so
on. If the resister address pointer attempts to increment
past 11 (h0B), it is automatically reset to 0.
An example of an auto-increment read from the part is
shown in Figure 13. The first byte of the burst sent from
the serial bus master on SDI contains the destination reg-
ister address (Addr0) and an LSB of “1” indicating a read.
Once the LTC6946 detects a read burst, it takes SDO out
of the Hi-Z condition and sends data bytes sequentially,
A6 A5 A4 A3 A2
7-BIT REGISTER ADDRESS
Hi-Z
MASTER–CS
MASTER–SCLK
MASTER–SDI
LTC6946–SD0
A1 A0 0 D7 D6 D5 D4 D3 D2 D1 D0
8 BITS OF DATA
0 = WRITE
6946 F09
16 CLOCKS
Addr0 + Wr
Hi-Z
MASTER–CS
MASTER–SDI
LTC6946–SDO
Byte 0
Addr1 + Wr
Byte 1
6946 F11
Addr0 + Wr
Hi-Z
MASTER–CS
MASTER–SDI
LTC6946–SDO
Byte 0
Byte 1
Byte 2
6946 F12
Figure 9. Serial Port Write Sequence
Figure 10. Serial Port Read Sequence
Figure 11. Serial Port Single Byte Write
Figure 12. Serial Port Auto-Increment Write
A6 A5 A4 A3 A2
7-BIT REGISTER ADDRESS
Hi-Z
A1 A0 1
D7
X
D6 D5 D4 D3 D2 D1 D0 DX
8 BITS OF DATA
1 = READ
6946 F10
MASTER–CS
MASTER–SCLK
MASTER–SDI
LTC6946–SDO
16 CLOCKS
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