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參數(shù)資料
| 型號： | MAX19794ETX+ |
| 廠商： | Maxim Integrated |
| 文件頁數(shù)： | 18/25頁 |
| 文件大小： | 5676K |
| 描述： | ATTENUATR 46DB 50OHM 4GHZ 36TQFN |
| 標(biāo)準(zhǔn)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 |
18
MAX19794
10MHz to 500MHz Dual Analog Voltage Variable
Attenuator with On-Chip 10-Bit SPI-Controlled DAC
Table 1. Attenuator Control Logic States
Detailed Description
The MAX19794 is a dual, general-purpose analog
voltage variable attenuator (VVA) designed to interface
with 50I systems operating in the 10MHz to 500MHz
frequency range. Each attenuator provides 22.4dB of
attenuation range with a linear control slope of 8dB/V.
Both attenuators share a common analog control and can
be cascaded together to yield 44.7dB of total dynamic
range with a combined linear control slope of 16dB/V.
Alternatively, the on-chip, 4-wire SPI-controlled 10-bit
DAC can be used to control both attenuators. In addition,
a step-up/down feature allows user-programmable
attenuator stepping through command pulses without
reprogramming the SPI interface.
Application Information
Attenuation Control and Features
The device has various states that are used to control the
analog attenuator along with some monitoring conditions.
The device can be controlled by an external control
voltage, an internal SPI bus, or a combination of the two.
The various states are described in Table 1. The SPI bus
has multiple registers that are used to control the device
when not configured for the analog only mode. For the
cases where CTRL is used, the control range is 1V to 4V
for V
CC
= 5V, and is 1V to 2.5V for V
CC
= 3.3V.
Up to 22.4dB of attenuation-control range is provided
per attenuator. At the insertion-loss setting, the single
attenuators loss is approximately 1.5dB. If a larger
attenuation-control range is desired, the second on-chip
attenuator can be connected in series to provide an
additional 22.4dB of gain-control range.
The on-chip control driver simultaneously adjusts both
on-chip attenuators. It is suggested that a current-limiting
resistor be included in series with CTRL to limit the input
current to less than 40mA, should the control voltage
be applied when V
CC
is not present. A series resistor
of greater than 200I provides complete protection for
+5.0V control voltage ranges.
Analog Mode Only Control
In Table 1 state (0, 0), the attenuators are controlled
using a voltage applied to the CTRL pin of the device and
the on-chip DAC is disabled. In the case where none of
the features of the SPI bus are needed, the part can be
operated in a pure analog control mode by grounding
pins 14 through 25.
DAC Mode Control
In Table 1 state (1, 0), the attenuators are controlled by
the on chip 10-bit DAC register. See the Register/Mode
section. In this condition, no signal is applied to the CTRL
pin and the load on the CTRL pin should be >100kI. The
DAC is set using the SPI loaded code in the registers
along with the setting of the mode pin.
Analog Mode Control with Alarm Monitoring
In Table 1 state (0, 1), the attenuators are controlled
using a voltage applied to the CTRL pin of the device.
See Register/Mode section. In this condition, the DAC
DAC_LOGIC
RDBK_EN
(D9, REG3)
INTERNAL
SWITCH STATES
ATTENUATOR
10-BIT DAC
0
0
S1 = closed
S2, S3, S4 = open
Controlled by external analog voltage on CTRL
(pin 11).
Disabled
1
0
S1, S3, S4 = open
S2 = closed
Controlled by on-chip DAC. No voltage applied
to pin 11.
Enabled
0
1
S1, S3, S4 = closed
S2 = open
Controlled by external analog voltage on CTRL
(pin 11). CTRL is compared with DAC output.
Comparator drives COMP_OUT (pin 17).
Enabled (update DAC
code to estimate CTRL
voltage on pin 11)
1
1
S1, S2 = closed
S3, S4 = open
Controlled by on-chip DAC. The DAC output is
connected to pin 11. Use this state to test the
DAC output. In this condition, no voltage can
be applied to pin 11 and the load on pin 11
must be > 100kI.
Enabled
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相關(guān)代理商/技術(shù)參數(shù) |
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?fù)浣Y(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?fù)浣Y(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?fù)浣Y(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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