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參數(shù)資料
| 型號： | MAX038CWP |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 運(yùn)動控制電子 |
| 英文描述： | High-Frequency Waveform Generator |
| 中文描述： | SQUARE; TRIANGULAR; SINE; SAWTOOTH; PULSE, 20 MHz, WAVEFORM GENERATION, PDSO20 |
| 封裝： | SOP-20 |
| 文件頁數(shù)： | 16/16頁 |
| 文件大小： | 203K |
| 代理商： | MAX038CWP |
M
High-Frequenc y Waveform Generator
16
______________________________________________________________________________________
Layout Considerations
Realizing the full performance of the MAX038 requires
careful attention to power-supply bypassing and board
layout. Use a low-impedance ground plane, and con-
nect all five GND pins directly to it. Bypass V+ and V-
directly to the ground plane with 1μF ceramic capaci-
tors or 1μF tantalum capacitors in parallel with 1nF
ceramics. Keep capacitor leads short (especially with
the 1nF ceramics) to minimize series inductance.
If SYNC is used, DV+ must be connected to V+, DGND
must be connected to the ground plane, and a second
1nF ceramic should be connected as close as possible
between DV+ and DGND (pins 16 and 15). It is not
necessary to use a separate supply or run separate
traces to DV+. If SYNC is disabled, leave DV+ open.
Do not open DGND.
Minimize the trace area around COSC (and the ground
plane area under COSC) to reduce parasitic capaci-
tance, and surround this trace with ground to prevent
coupling with other signals. Take similar precautions
with DADJ , FADJ , and IIN. Place C
F
so its connection
to the ground plane is close to pin 6 (GND).
__________Applic ations Information
Frequenc y S ynthesizer
Figure 6 shows a frequency synthesizer that produces
accurate and stable sine, square, or triangle waves with
a frequency range of 8kHz to 16.383MHz in 1kHz incre-
ments. A Motorola MC145151 provides the crystal-con-
trolled oscillator, the ÷N circuit, and a high-speed phase
detector. The manual switches set the output frequency;
opening any switch increases the output frequency.
Each switch controls both the ÷N output and an
MX7541 12-bit DAC, whose output is converted to a cur-
rent by using both halves of the MAX412 op amp. This
current goes to the MAX038 IIN pin, setting its coarse
frequency over a very wide range.
Fine frequency control (and phase lock) is achieved
from the MC145151 phase detector through the differ-
ential amplifier and lowpass filter, U5. The phase detec-
tor compares the ÷N output with the MAX038 SYNC
output and sends differential phase information to U5.
U5’s single-ended output is summed with an offset into
the FADJ input. (Using the DAC and the IIN pin for
coarse frequency control allows the FADJ pin to have
very fine control with reasonably fast response to switch
changes.)
A 50MHz, 50
lowpass filter in the output allows pas-
sage of 16MHz square waves and triangle waves with
reasonable fidelity, while stopping high-frequency noise
generated by the ÷N circuit.
V+
PDI
SYNC
AO
DADJ
PDO
FADJ
0.118"
(2.997mm)
0.106"
(2.692mm)
A1
COSC
GND
IIN
GND
GND
DGND
DV+
GND
GND
REF
V-
OUT
TRANSISTOR COUNT: 855
SUBSTRATE CONNECTED TO GND
___________________Chip Topography
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX038CWP+ | 功能描述:時鐘發(fā)生器及支持產(chǎn)品 RoHS:否 制造商:Silicon Labs 類型:Clock Generators 最大輸入頻率:14.318 MHz 最大輸出頻率:166 MHz 輸出端數(shù)量:16 占空比 - 最大:55 % 工作電源電壓:3.3 V 工作電源電流:1 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-56 |
| MAX038CWP+T | 功能描述:時鐘發(fā)生器及支持產(chǎn)品 RoHS:否 制造商:Silicon Labs 類型:Clock Generators 最大輸入頻率:14.318 MHz 最大輸出頻率:166 MHz 輸出端數(shù)量:16 占空比 - 最大:55 % 工作電源電壓:3.3 V 工作電源電流:1 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-56 |
| MAX038CWP-T | 功能描述:時鐘發(fā)生器及支持產(chǎn)品 RoHS:否 制造商:Silicon Labs 類型:Clock Generators 最大輸入頻率:14.318 MHz 最大輸出頻率:166 MHz 輸出端數(shù)量:16 占空比 - 最大:55 % 工作電源電壓:3.3 V 工作電源電流:1 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-56 |
| MAX038EPP | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:High-Frequency Waveform Generator |
| MAX038EVKIT | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Evaluation Kit for the MAX038 |
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