參數(shù)資料
型號： MAX19794ETX+
廠商： Maxim Integrated
文件頁數(shù)： 22/25頁
文件大?。?/td> 5676K
描述： ATTENUATR 46DB 50OHM 4GHZ 36TQFN
標準包裝： 50
衰減值： 0dB ~ 46.4dB
頻率范圍： 500MHz ~ 4GHz
阻抗： 50 歐姆
封裝/外殼： 36-WFQFN 裸露焊盤
  22
MAX19794
10MHz to 500MHz Dual Analog Voltage Variable
Attenuator with On-Chip 10-Bit SPI-Controlled DAC
Layout Considerations
A properly designed PCB is an essential part of any
RF/microwave circuit. Keep RF signal lines as short as
possible to reduce losses, radiation, and inductance. For
best performance, route the ground-pin traces directly
to the exposed pad underneath the package. This pad
must be connected to the ground plane of the board by
using multiple vias under the device to provide the best
RF and thermal conduction path. Solder the exposed
pad on the bottom of the device package to a PCB.
RF Ground Return Capacitors
The device requires RF ground return capacitors C10
and C11. The value of these capacitors optimize the
dynamic range and frequency flatness for the RF band of
interest. Some recommended values are shown in Table 
7  along  with  the  resulting  performance  in  the  Typical
Operating Characteristics section.
Figure 2. SPI Timing Diagram
Figure 3. UP DWN Control Diagram (Mode = 1)
SPI Interface Programming
Table 7. Typical Application Circuit Component Values
*Add 2 additional 10I resistors between the V
CC
 pins leading to C5 and C6 unless a V
CC
 power plane is used.
DESIGNATION
QTY
DESCRIPTION
C1, C2, C4
3
0.01FF Q5% 50V X7R ceramic capacitors (0402).
C3
0
Not installed for two attenuators in cascade
C5C9
5
1000pF Q5% 50V COG ceramic capacitors (0402)
C10, C11
2
10MHz to 200MHz
0.01FF Q10% 50V X7R ceramic capacitors
(0402)
250MHz to 500MHz
100pF Q5% 50V COG ceramic capacitors
(0402)
C12
1
120pF Q5% 50V COG CER CAP (0402).Provides some external noise filtering along with R3.
C13
0
Not installed. A 4.7pF capacitor could be used to reduce any potential rise time glitching when
the comparator changes state.
R1*, R2*
2
10I Q5% resistor (0402)
R3
1
200I Q5% resistor (0402). This resistor is used to provide some lowpass noise filtering when
used with C12. The value of R3 slows down the response time. R3 also provides protection for
the device in case V
CTRL
is applied without V
CC
 present.
U1
1
MAX19794
R/W   A1   A0
D9, D8...D0 TO REGISTER 0, 1, 2, 3
CS
CLK
D
IN
D9, D8...D0 FROM REGISTER 0, 1, 2, 3
D
OUT
t
CS
HIGH-Z
HIGH-Z
t
CW
t
ES
t
EW
t
CH
t
EWS
UP
1
1
0
0
DWN
NO DAC
CODE CHANGE
DAC CODE
INCREASED
BY STEP UP
DAC CODE
DECREASED
BY STEP DOWN
DAC CODE
RESET TO
ALL 0's
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參數(shù)描述
MAX19794ETX+ 功能描述:衰減器 -IC 10MHz to 500MHz Attenuator RoHS:否 制造商:Skyworks Solutions, Inc. 最大衰減:18 dB 容差: 阻抗: 功率額定值:30 dBm 安裝風(fēng)格:SMD/SMT 工作溫度范圍:- 40 C to + 85 C
MAX19794ETX+T 功能描述:衰減器 -IC 10MHz to 500MHz Attenuator RoHS:否 制造商:Skyworks Solutions, Inc. 最大衰減:18 dB 容差: 阻抗: 功率額定值:30 dBm 安裝風(fēng)格:SMD/SMT 工作溫度范圍:- 40 C to + 85 C
MAX1979ETM 功能描述:電壓模式 PWM 控制器 RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓撲結(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel
MAX1979ETM+ 功能描述:電壓模式 PWM 控制器 Integrated Temp Ctlr for Peltier Modules RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓撲結(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel
MAX1979ETM+T 功能描述:電壓模式 PWM 控制器 Integrated Temp Ctlr for Peltier Modules RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓撲結(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel
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