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| 型号： | AD9851BRSZRL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 8/24页 |
| 文件大小： | 0K |
| 描述： | IC SYNTHESR DDS/DAC 28SSOP TR |
| 产品培训模块： | Direct Digital Synthesis Tutorial Series (1 of 7): Introduction Direct Digital Synthesizer Tutorial Series (7 of 7): DDS in Action Direct Digital Synthesis Tutorial Series (3 of 7): Angle to Amplitude Converter Direct Digital Synthesis Tutorial Series (6 of 7): SINC Envelope Correction Direct Digital Synthesis Tutorial Series (4 of 7): Digital-to-Analog Converter Direct Digital Synthesis Tutorial Series (2 of 7): The Accumulator |
| 标准包装： | 1,500 |
| 分辨率（位）： | 10 b |
| 主 fclk： | 180MHz |
| 调节字宽（位）： | 32 b |
| 电源电压： | 2.7 V ~ 5.25 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SSOP（0.209"，5.30mm 宽） |
| 供应商设备封装： | 28-SSOP |
| 包装： | 带卷 (TR) |
AD9851
–16–
FQ UD
W2
DATA
40
40 W
W CLK CYCLES
CLK CYCLES
W CLK
W1
W3
W39
W0
Figure 19. Serial Load Frequency/Phase Update Sequence
Table III. 40-Bit Serial Load Word Functional Assignment
W0
Freq–b0 (LSB)
W1
Freq–b1
W2
Freq–b2
W3
Freq–b3
W4
Freq–b4
W5
Freq–b5
W6
Freq–b6
W7
Freq–b7
W8
Freq–b8
W9
Freq–b9
W10
Freq–b10
W11
Freq–b11
W12
Freq–b12
W13
Freq–b13
W14
Freq–b14
W15
Freq–b15
W16
Freq–b16
W17
Freq–b17
W18
Freq–b18
W19
Freq–b19
W20
Freq–b20
W21
Freq–b21
W22
Freq–b22
W23
Freq–b23
W24
Freq–b24
W25
Freq–b25
W26
Freq–b26
W27
Freq–b27
W28
Freq–b28
W29
Freq–b29
W30
Freq–b30
W31
Freq–b31 (MSB)
W32
6 REFCLK Multiplier Enable
W33
Logic 0*
W34
Power-Down
W35
Phase–b0 (LSB)
W36
Phase–b1
W37
Phase–b2
W38
Phase–b3
W39
Phase–b4 (MSB)
*This bit is always Logic 0.
Figure 20 shows a normal 40-bit serial word load sequence with
W33 always set to Logic 0 and W34 set to Logic 1 or Logic 0
to control the power-down function. The logic states of the
remaining 38 bits are unimportant and are marked with an X,
indicating “don’t care” status.To power down, set W34 = 1. To
power up from a powered down state, change W34 to Logic 0.
Wake-up from power-down mode requires approximately 5 s.
Note:The 40-bit input register of the AD9851 is fully program-
mable while in the power-down mode.
FQ UD
W34 = 1
OR 0
DATA (7) –
40 W_CLK RISING EDGES
W CLK
W33 = 0
W35 = X
W39 = X
W38 = X
W0 = X
Figure 20. Serial Load Power-Down\Power-Up Sequence
IOUT
IOUTB
VDD
VINP/
VINN
VDD
a. DAC Output
c. Comparator Input
DIGITAL
OUT
VDD
DIGITAL
IN
VDD
b. Comparator Output
d. Digital Input
Figure 21. I/O Equivalent Circuits
REV. D
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