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参数资料
| 型号： | MAX7058ATG+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 9/14页 |
| 文件大小： | 0K |
| 描述： | IC TX 315MHZ/390MHZ ASK 24-TQFN |
| 其它有关文件： | Automotive Product Guide |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 频率： | 315MHz ~ 390MHz |
| 应用： | 汽车 RKE，遥控，无线传感器 |
| 调制或协议： | ASK，OOK |
| 数据传输率 - 最大： | 50 kbps |
| 功率 - 输出： | 10dBm |
| 电流 - 传输： | 12.9mA |
| 数据接口： | PCB，表面贴装 |
| 天线连接器： | PCB，表面贴装 |
| 电源电压： | 2.1 V ~ 3.6 V |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 24-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
315MHz/390MHz Dual-Frequency
ASK Transmitter
Operating Mode
TOGGLE and FSEL are two pins available for control-
ling the state of the toggle mode and the operating fre-
quency. The following truth table defines the pin logic
for the four possible operating states.
Table 1. Toggle Pin Operation for MAX7058
CASE 1: DIN PIN ONLY USED TO POWER UP THE MAX7058
DIN
ENABLE
TOGGLE
PIN
FSEL
PIN
OPERATING STATE
POWER-UP
(INTERNAL)
279.62ms
(WITH 15MHz
REFERENCE)
0
0
1
0
1
0
Continuous fixed-frequency operation at
390MHz
Continuous fixed-frequency operation at
315MHz
Five packets toggle operation between
315MHz and 390MHz
CASE 2: ENABLE PIN ONLY USED TO POWER UP THE MAX7058
DIN
ENABLE
1
1
100 packets toggle operation between
315MHz and 390MHz
POWER-UP
(INTERNAL)
FALLING EDGE OF ENABLE MUST COME AFTER
The internal variable shunt capacitor control pins
(CAP1–CAP4) are used whenever the frequency setting
is 315MHz, in either continuous (TOGGLE = 0, FSEL =
1) or toggle (TOGGLE = 1) mode.
Toggle Definition
With TOGGLE/FSEL set to state 10, the MAX7058 is in
5-packet toggle mode; with TOGGLE/FSEL set to state
11, the MAX7058 is in 100-packet toggle mode. Upon
power-up, the MAX7058 begins transmission at
315MHz within 250μs. Packet termination is defined as
the time duration of greater than 2 18 crystal oscillator ref-
erence clock cycles (17.49ms) with DIN continuously at
logic 0. The frequency of operation toggles every five or
100 packets based on the logic level of FSEL.
Power Amplifier (PA)
The power amplifier (PA) of the MAX7058 is a high-
efficiency, open-drain, switching-mode amplifier. In a
switching-mode amplifier, the gate of the final-stage
FET is driven with a very sharp 25% duty-cycle square
wave at the transmit frequency. This square wave is
derived from the synthesizer circuit. When the matching
network is tuned correctly, the output FET resonates the
attached tank circuit with a minimum amount of power
dissipated in the FET. With a proper output-matching
network, the PA can drive a wide range of antenna
impedances, which include a small-loop PCB trace and
a 50 Ω antenna. The output-matching network sup-
presses the carrier harmonics and transforms the
antenna impedance to optimal impedance at PAOUT,
which is from 125 Ω to 250 Ω .
LAST DIN FALLING EDGE
Figure 1. Power-Up Waveform with DIN/ENABLE for MAX7058
When the output-matching network is properly tuned,
the PA transmits +10dBm (typ), with a high overall effi-
ciency. The efficiency of the PA itself is more than 40%.
The output power can be adjusted by changing the
impedance seen by the PA or by adjusting the value of
an external resistor at PAOUT.
Envelope Shaping
The MAX7058 features an internal envelope-shaping
resistor, which connects between PAVDD and ROUT.
When connected to the PA pullup inductor, the enve-
lope-shaping resistor slows the turn-on/turn-off time of
the PA and results in a smaller spectral width of the
modulated PA output signal.
Variable Capacitor
The MAX7058 has a set of selectable internal shunt
capacitors that can be switched in and out to present
different capacitor values at the PA output. The capaci-
tors are connected from the PA output to ground. This
allows changing the tuning network, along with the syn-
thesizer-divide ratio each time the transmitted frequen-
cy changes, making it possible to maintain maximum
transmitter power while moving rapidly from one fre-
quency to another.
_______________________________________________________________________________________
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| MAX705CPA | 功能描述:监控电路 RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
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| MAX705CSA | 功能描述:监控电路 RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
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