23
MAX19794
10MHz to 500MHz Dual Analog Voltage Variable
Attenuator with On-Chip 10-Bit SPI-Controlled DAC
Power-Supply Bypassing
Proper voltage-supply bypassing is essential for high
frequency circuit stability. Bypass each V
CC
pin with
capacitors placed as close as possible to the device.
Place the smallest capacitor closest to the device. See
the Typical Application Circuit and Table 7 for details.
Exposed Pad RF and Thermal
Considerations
The exposed pad (EP) of the devices 36-pin TQFN
package provides a low thermal-resistance path to the die.
It is important that the PCB on which the device is mounted
to conduct heat from this contact. In addition, provide the
EP with a low-inductance RF ground path for the device.
The EP must be soldered to a ground plane on the PCB,
either directly or through an array of plated via holes.
Soldering the pad to ground is also critical for efficient
heat transfer. Use a solid ground plane wherever possible.
Typical Application Circuit
MAX19794
EP
C1
RFIN_A
V
CC
IN_B
GND
2
3
4
5
6
7
S1
S2
S3
S4
8
9
10
11
12
13
14
DAC
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
ATTEN_B
ATTEN_A
30
31
32
33
34
35
36
OUT_B
1
ATTENUATION-
CONTROL
CIRCUITRY
R1
C5
CTRL
GND
C12
C7
C13
C8
V
CTRL
REF_IN
R3
GND
GND
GND
GND
NOTE: FOR ATTENUATOR A ONLY CONFIGURATION, REMOVE C3 AND MOVE C2 DIAGONALLY TO CONNECT PIN 2 TO THE OUTPUT CONNECTION RF_AB.
FOR ATTENUATOR B ONLY CONFIGURATION, REMOVE C2.
FOR CASCADED CONFIGURATION, REMOVE C3 AND USE C2 TO CONNECT OUT_A TO IN_B.
GND
RTNB
REF_IN
REF_SEL
REF_SEL
DAC_LOGIC
DAC_LOGIC
MODE
MODE
COMP_OUT
COMP_OUT
V
CC
R2
C4
C3
C6
C9
C2
RFOUT_B
RF_AB
V
CC
V
CC
CS
V
CC
V
CC
DOUT
DIN
CLK
UP
DWN
C11
C10
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相关代理商/技术参数
MAX19794ETX+T
功能描述:衰减器 -IC 10MHz to 500MHz Attenuator RoHS:否 制造商:Skyworks Solutions, Inc. 最大衰减:18 dB 容差: 阻抗: 功率额定值:30 dBm 安装风格:SMD/SMT 工作温度范围:- 40 C to + 85 C
MAX1979ETM
功能描述:电压模式 PWM 控制器 RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel
MAX1979ETM+
功能描述:电压模式 PWM 控制器 Integrated Temp Ctlr for Peltier Modules RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel
MAX1979ETM+T
功能描述:电压模式 PWM 控制器 Integrated Temp Ctlr for Peltier Modules RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel
MAX1979ETM-T
功能描述:电压模式 PWM 控制器 RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel
MAX197ACAI
功能描述:模数转换器 - ADC Integrated Circuits (ICs) RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32
MAX197ACAI+
功能描述:模数转换器 - ADC 12-Bit 8Ch 100ksps 4.18V Precision ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32
MAX197ACAI+T
功能描述:模数转换器 - ADC 12-Bit 8Ch 100ksps 4.18V Precision ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32