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Low-Cost, 315MHz and 433.92MHz
ASK Transceiver with Fractional-N PLL
only and connect AVDD, PAVDD, and DVDD together.
In both cases, bypass DVDD, HVIN, and PAVDD to
GND with 0.01μF and 220pF capacitors and bypass
AVDD to GND with 0.1μF and 220pF capacitors.
Bypass T/ R , ENABLE, DATA, and AGC0-2 with 10pF
capacitors to GND. Place all bypass capacitors as
close as possible to the respective pins.
Transmit/ Receive Antenna Switch
The MAX7030 features an internal SPST RF switch that,
In actuality, the oscillator pulls every crystal. The crys-
tal’s natural frequency is really below its specified fre-
quency, but when loaded with the specified load
capacitance, the crystal is pulled and oscillates at its
specified frequency. This pulling is already accounted
for in the specification of the load capacitance.
Additional pulling can be calculated if the electrical
parameters of the crystal are known. The frequency
pulling is given by:
C m ? 1 1 ?
? C
C CASE + C SPEC ? ?
2 ? CASE + C LOAD
when combined with a few external components, allows
the transmit and receive pins to share a common
antenna (see the Typical Application Circuit). In receive
f P =
?
x 10 6
mode, the switch is open and the power amplifier is
shut down, presenting a high impedance to minimize
the loading of the LNA. In transmit mode, the switch
closes to complete a resonant tank circuit at the PA
output and forms an RF short at the input to the LNA. In
this mode, the external passive components couple the
output of the PA to the antenna and protect the LNA
input from strong transmitted signals.
The switch state is controlled by the T/ R pin (pin 22).
Drive T/ R high to put the device in transmit mode; drive
T/ R low to put the device in receive mode.
Control Interface Considerations
When operating the MAX7030 with a +4.5V to +5.5V
supply voltage, the AGC0, ACG1, AGC2, DATA,
ENABLE and T/ R pins may be driven by a microcon-
troller with either 3V or 5V interface logic levels. When
where:
f p is the amount the crystal frequency is pulled in ppm.
C m is the motional capacitance of the crystal.
C CASE is the case capacitance.
C SPEC is the specified load capacitance.
C LOAD is the actual load capacitance.
When the crystal is loaded as specified, i.e.,
C LOAD = C SPEC , the frequency pulling equals zero.
Pin Configuration
TOP VIEW
operating the MAX7030 with a +2.1V to +3.6V supply,
the microcontroller must produce logic levels which
24
23
22
21
20
19
18
17
conform to the V IH and V IL specifications in the DC
Electrical Characteristics for the MAX7030.
Crystal Oscillator (XTAL)
N.C.
DVDD
HVIN
25
26
27
16
15
14
PDMAX
PDMIN
IFIN+
The XTAL oscillator in the MAX7030 is designed to pre-
sent a capacitance of approximately 3pF between the
XTAL1 and XTAL2 pins. In most cases, this corre-
sponds to a 4.5pF load capacitance applied to the
external crystal when typical PCB parasitics are added.
It is very important to use a crystal with a load
capacitance that is equal to the capacitance of the
AGC2
AGC1
AGC0
XTAL1
XTAL2
28
29
30
31
32
MAX7030
13
12
11
10
9
IFIN-
MIXOUT
MIXIN-
MIXIN+
LNAOUT
MAX7030 crystal oscillator plus PCB parasitics . If a
crystal designed to oscillate with a different load
+
1
2
3
4
5
6
7
8
capacitance is used, the crystal is pulled away from its
stated operating frequency, introducing an error in the
reference frequency. Crystals designed to operate with
higher differential load capacitance always pull the ref-
erence frequency higher.
16
THIN QFN
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相关代理商/技术参数
MAX7030HATJ-T
制造商:Maxim Integrated Products 功能描述:LOW-COST,CRYSTAL-BASED,315MHZ,345MHZ,&433.92M - Tape and Reel
MAX7030LATJ
制造商:Maxim Integrated Products 功能描述:LOW-COST,CRYSTAL-BASED,315MHZ,345MHZ,&433.92M - Rail/Tube
MAX7030LATJ+
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
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
MAX7030MATJ
制造商:Maxim Integrated Products 功能描述:LOW-COST,CRYSTAL-BASED,315MHZ,345MHZ,&433.92M - Rail/Tube
MAX7030MATJ+
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
MAX7030MATJ-T
制造商:Maxim Integrated Products 功能描述:LOW-COST,CRYSTAL-BASED,315MHZ,345MHZ,&433.92M - Tape and Reel