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參數(shù)資料
| 型號： | MAX7032 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Low-Cost, Crystal-Based, Programmable, ASK/FSK Transceiver with Fractional-N PLL |
| 中文描述： | 低成本、基于晶振的可編程ASK/FSK收發(fā)器，帶有N分頻PLL |
| 文件頁數(shù)： | 16/32頁 |
| 文件大?。?/td> | 449K |
| 代理商： | MAX7032 |
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M
Low-Cost, Crystal-Based, Programmable,
ASK/FSK Transceiver with Fractional-N PLL
16
______________________________________________________________________________________
The maximum and minimum peak detectors can be
used together to form a data slicer threshold voltage at
a value midway between the maximum and minimum
voltage levels of the data stream (see the
Data Slicer
section and Figure 4). The RC time constant of the
peak-detector combining network should be set to at
least 5 times the data period.
If there is an event that causes a significant change in
the magnitude of the baseband signal, such as an AGC
gain switch or a power-up transient, the peak detectors
may “catch” a false level. If a false peak is detected,
the slicing level is incorrect. The MAX7032 has a fea-
ture called peak-detector track enable (TRK_EN),
where the peak-detector outputs can be reset (see
Figure 5). If TRK_EN is set (logic 1), both the maximum
and minimum peak detectors follow the input signal.
When TRK_EN is cleared (logic 0), the peak detectors
revert to their normal operating mode. The TRK_EN
function is automatically enabled for a short time when-
ever the IC is first powered up, or transitions from trans-
mit to receive mode, or recovers from the sleep portion
of DRX mode, or when an AGC gain switch occurs
regardless of the bit setting. Since the peak detectors
exhibit a fast-attack/slow-decay response, this feature
allows for an extremely fast startup or AGC recovery.
See Figure 6 for an illustration of a fast-recovery
sequence. In addition to the automatic control of this
function, the TRK_EN bits can be controlled through the
serial interface (see the
Serial Control Interface
section).
Transmitter
Power Amplifier (PA)
The PA of the MAX7032 is a high-efficiency, open-
drain, Class C amplifier. The PA with proper output-
matching network can drive a wide range of antenna
impedances, which includes a small-loop PC board
trace and a 50
antenna. The output-matching network
for a 50
antenna is shown in the
Typical Application
Circuit
. The output-matching network suppresses the
carrier harmonics and transforms the antenna imped-
ance to an optimal impedance at PAOUT (pin 5). The
optimal impedance at PAOUT is 250
.
When the output-matching network is properly tuned, the
PA transmits power with a high overall efficiency of up to
32%. The efficiency of the PA itself is more than 46%.
The output power is set by an external resistor at
PAOUT, and is also dependent on the external antenna
and antenna-matching network at the PA output.
MAX7032
PDMIN
TO SLICER
INPUT
BASEBAND
FILTER
MINIMUM PEAK
DETECTOR
MAXIMUM PEAK
DETECTOR
PDMAX
TRK_EN = 1
TRK_EN = 1
Figure 5. Peak-Detector Track Enable
Figure 6. Fast Receiver Recovery in FSK Mode Utilizing Peak
Detectors
200mV/div
DATA OUTPUT
2V/div
MIN PEAK DETECTOR
DATA OUTPUT
MAX PEAK DETECTOR
RECEIVER ENABLED, TRK_EN SET
TRK_EN CLEARED
FILTER OUTPUT
100
μ
s/div
MAX7032
C
PDMAX
PDMIN
R
C
R
DATA
SLICER
DATA
DET
PEAK
DET
Figure 4. Generating Data Slicer Threshold Using the Peak
Detectors
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| MAX7032_09 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Low-Cost, Crystal-Based, Programmable, ASK/FSK Transceiver with Fractional-N PLL |
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| MAX7032ATJ | 制造商:Maxim Integrated Products 功能描述:LOW-COST,CRYSTAL-BASED,308MHZ,315MHZ,&433.92M - Rail/Tube |
| MAX7032ATJ+ | 功能描述:射頻收發(fā)器 Crystal-Based Prog ASK/FSK Transceiver RoHS:否 制造商:Atmel 頻率范圍:2322 MHz to 2527 MHz 最大數(shù)據(jù)速率:2000 Kbps 調(diào)制格式:OQPSK 輸出功率:4 dBm 類型: 工作電源電壓:1.8 V to 3.6 V 最大工作溫度:+ 85 C 接口類型:SPI 封裝 / 箱體:QFN-32 封裝:Tray |
| MAX7032ATJ+T | 功能描述:射頻收發(fā)器 Crystal-Based Prog ASK/FSK Transceiver RoHS:否 制造商:Atmel 頻率范圍:2322 MHz to 2527 MHz 最大數(shù)據(jù)速率:2000 Kbps 調(diào)制格式:OQPSK 輸出功率:4 dBm 類型: 工作電源電壓:1.8 V to 3.6 V 最大工作溫度:+ 85 C 接口類型:SPI 封裝 / 箱體:QFN-32 封裝:Tray |
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