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參數(shù)資料
| 型號： | MAX19792ETX+ |
| 廠商： | Maxim Integrated |
| 文件頁數(shù)： | 17/23頁 |
| 文件大?。?/td> | 4796K |
| 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 |
17
Maxim Integrated
MAX19792
500MHz to 4000MHz Dual Analog Voltage Variable
Attenuator with On-Chip 10-Bit SPI-Controlled DAC
the part. In MODE 1, the effective DAC code fed to the
10-bit DAC register is equal to:
m x Register 1 - n x Register 2
where m and n are the number of UP and DWN control
steps accumulated, respectively.
After powering up the device, UP and DWN should both
be set to 0 to reset the m and n counters to 0. This results
in a 10-bit all 0 code out of the mathematical block in
Figure 1, and applied to the 10-bit DAC register that
drives the DAC. To increase (decrease) the code using
the UP (DWN) pin, the DWN (UP) pin must be high and
the UP (DWN) pin should be pulsed low to high. The
device is designed to produce no wraparounds when
using UP and DWN stepping so that the DAC code
maxes out at 1023 or goes no lower than 0. See Figure 3
for the UP and DWN control operation.
Switching back to MODE = 0 produces the same 10-bit
DAC code as was previously loaded into register 0.
Switching back to MODE = 1 results in the previous
10-bit DAC code from the register 1 and 2 combiner/
multiplier block.
Register 3 is used to set the RDBK_EN register in the
write mode and is used to read back the RDBK_EN reg-
ister and COMP_OUT in the read mode.
SPI Interface
The device can be controlled with a 4-wire, SPI-compatible
serial interface. Figure 2 shows a timing diagram for the
interface. In the write mode, a 13-bit word is loaded into
the device through the DIN pin, with CS set low. The first
bit of the word in the write mode is 0, and the next two
bits select the register to be written to (Table 2). The
next 10 bits contain the data to be written to the selected
register. After the 13 bits are shifted in, a low-to-high CS
command is applied and this latches the 10 bits into the
selected register. The entire write command is ignored if
CS is pulsed low to high before the last data bit is suc-
cessfully captured.
For the read cycle, the first bit clocked in is a 1 and this
establishes that a register is to be read. The next two
clocked bits form the address of the register to be read
(Table 2). In this read mode, data starts to get clocked
out of the DOUT pin after A0 is captured. The DOUT
pin goes to a high-impedance state after the 10 bits are
transmitted or if CS goes high at any point during the
transmission.
Voltage Reference
The device has an on-chip voltage reference for the DAC
and a provision to operate with an off-chip reference.
Table 6 provides details in selecting the desired reference.
Table 1. Attenuator Control Logic States
DAC_LOGIC
RDBK_EN
(D9, REG 3)
INTERNAL SWITCH
STATES
ATTENUATOR
10-BIT DAC
0
0
S1 = closed
S2, S3, S4 = open
Controlled by an external analog voltage on the
CTRL pin.
Disabled
1
0
S1, S3, S4 = open
S2 = closed
Controlled by an on-chip DAC; no voltage is
applied to the CTRL pin.
Enabled
0
1
S1, S3, S4 = closed
S2 = open
Controlled by an external analog voltage on the
CTRL
pin. CTRL is compared with the
DAC output. The comparator drives the
COMP_OUT pin.
Enabled
(update DAC code
to estimate voltage
on the CTRL pin)
1
1
S1, S2 = closed
S3, S4 = open
Controlled by an on-chip DAC. The DAC output
is connected to the CTRL pin. This state can be
used to test the DAC output. In this condition,
no voltage can be applied to the CTRL pin and
the load on this pin must be > 100k&.
Enabled
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MAX19792ETX+ | 功能描述:衰減器 -IC 500MHz to 3000MHz 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 安裝風格:SMD/SMT 工作溫度范圍:- 40 C to + 85 C |
| MAX19792ETX+T | 功能描述:衰減器 -IC 500MHz to 3000MHz 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 安裝風格:SMD/SMT 工作溫度范圍:- 40 C to + 85 C |
| MAX19793ETX+ | 功能描述:衰減器 -IC 2000MHz to 5000MHz 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 安裝風格:SMD/SMT 工作溫度范圍:- 40 C to + 85 C |
| MAX19793ETX+T | 功能描述:衰減器 -IC 2000MHz to 5000MHz 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 安裝風格:SMD/SMT 工作溫度范圍:- 40 C to + 85 C |
| 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 安裝風格:SMD/SMT 工作溫度范圍:- 40 C to + 85 C |
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