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Low-Cost, 315MHz and 433.92MHz
ASK Transceiver with Fractional-N PLL
Pin Description (continued)
PIN
28
29
30
31
32
—
NAME
AGC2
AGC1
AGC0
XTAL1
XTAL2
EP
FUNCTION
AGC Enable/Dwell Time Control 2 (MSB). See Table 1. Bypass to GND with a 10pF capacitor.
AGC Enable/Dwell Time Control 1. See Table 1. Bypass to GND with a 10pF capacitor.
AGC Enable/Dwell Time Control 0 (LSB). See Table 1. Bypass to GND with a 10pF capacitor.
Crystal Input 1. Bypass to GND if XTAL2 is driven by an AC-coupled external reference.
Crystal Input 2. XTAL2 can be driven from an external AC-coupled reference.
Exposed Pad. Solder evenly to the board’s ground plane for proper operation.
Detailed Description
The MAX7030 315MHz and 433.92MHz CMOS trans-
ceiver and a few external components provide a com-
plete transmit and receive chain from the antenna to
The LC tank filter connected to LNAOUT consists of L5
and C9 (see the Typical Application Circuit). Select L5
and C9 to resonate at the desired RF input frequency.
The resonant frequency is given by:
the digital data interface. This device is designed for
transmitting and receiving ASK data. All transmit fre-
quencies are generated by a fractional-N-based syn-
f =
1
2 π L TOTAL × C TOTAL
thesizer, allowing for very fine frequency steps in
increments of f XTAL /4096. The receive LO is generated
by a traditional integer-N-based synthesizer.
Depending on component selection, data rates as high
as 33kbps (Manchester encoded) or 66kbps (NRZ
encoded) can be achieved.
Receiver
Low-Noise Amplifier (LNA)
The LNA is a cascode amplifier with off-chip inductive
degeneration that achieves approximately 30dB of volt-
age gain that is dependent on both the antenna-match-
ing network at the LNA input and the LC tank network
between the LNA output and the mixer inputs.
The off-chip inductive degeneration is achieved by
connecting an inductor from LNASRC to GND. This
inductor sets the real part of the input impedance at
LNAIN, allowing for a more flexible match for low-input
impedances such as a PCB trace antenna. A nominal
value for this inductor with a 50 Ω input impedance is
12nH at 315MHz and 10nH at 434MHz, but the induc-
tance is affected by PCB trace length. LNASRC can be
shorted to ground to increase sensitivity by approxi-
mately 1dB, but the input match must then be reopti-
mized.
where L TOTAL = L5 + L PARASITICS and C TOTAL = C9 +
C PARASITICS .
L PARASITICS and C PARASITICS include inductance and
capacitance of the PCB traces, package pins, mixer-
input impedance, LNA-output impedance, etc. These
parasitics at high frequencies cannot be ignored, and
can have a dramatic effect on the tank filter center fre-
quency. Lab experimentation should be done to opti-
mize the center frequency of the tank. The total
parasitic capacitance is generally between 5pF and
7pF.
Automatic Gain Control (AGC)
When the AGC is enabled, it monitors the RSSI output.
When the RSSI output reaches 1.28V, which corre-
sponds to an RF input level of approximately -55dBm,
the AGC switches on the LNA gain-reduction attenua-
tor. The attenuator reduces the LNA gain by 36dB,
thereby reducing the RSSI output by about 540mV to
740mV. The LNA resumes high-gain mode when the
RSSI output level drops back below 680mV (approxi-
mately -59dBm at the RF input) for a programmable
interval called the AGC dwell time (see Table 1). The
AGC has a hysteresis of approximately 4dB. With the
AGC function, the RSSI dynamic range is increased,
allowing the MAX7030 to reliably produce an ASK out-
put for RF input levels up to 0dBm with a modulation
depth of 18dB. AGC is not required and can be dis-
abled (see Table 1).
12
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MAX7030HATJ-T
制造商:Maxim Integrated Products 功能描述:LOW-COST,CRYSTAL-BASED,315MHZ,345MHZ,&433.92M - Tape and Reel
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功能描述:射频收发器 315/345/433.92MHz ASK Transceiver RoHS:否 制造商:Atmel 频率范围:2322 MHz to 2527 MHz 最大数据速率:2000 Kbps 调制格式:OQPSK 输出功率:4 dBm 类型: 工作电源电压:1.8 V to 3.6 V 最大工作温度:+ 85 C 接口类型:SPI 封装 / 箱体:QFN-32 封装:Tray
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功能描述:射频收发器 315/345/433.92MHz ASK Transceiver RoHS:否 制造商:Atmel 频率范围:2322 MHz to 2527 MHz 最大数据速率:2000 Kbps 调制格式:OQPSK 输出功率:4 dBm 类型: 工作电源电压:1.8 V to 3.6 V 最大工作温度:+ 85 C 接口类型:SPI 封装 / 箱体:QFN-32 封装:Tray
MAX7030LATJ-T
制造商:Maxim Integrated Products 功能描述:LOW-COST,CRYSTAL-BASED,315MHZ,345MHZ,&433.92M - Tape and Reel
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制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Low-Cost, 315MHz, 345MHz, and 433.92MHz ASK Transceiver with Fractional-N PLL
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制造商:Maxim Integrated Products 功能描述:LOW-COST,CRYSTAL-BASED,315MHZ,345MHZ,&433.92M - Tape and Reel