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| 型号： | MAX7058ATG+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 10/14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
When the particular capacitance control input pin is
high, then the corresponding amount of capacitance is
added at PAOUT; this capacitance tuning works only at
315MHz. The 16 capacitor values are selected by set-
ting CAP1–CAP4; the capacitance resolution is 0.5pF.
The total capacitance varies from 0 to 7.5pF. For exam-
ple, if CAP1 and CAP3 are high and CAP4 and CAP2
are low when operating at 315MHz, then this circuit will
add 2.5pF at PAOUT.
Table 2. Variable Capacitor Values and
Control Input Pins
Crystal (XTAL) Oscillator
The crystal (XTAL) oscillator in the MAX7058 is
designed to present a capacitance of approximately
6pF between XTAL1 and XTAL2. In most cases, this
corresponds to an 8pF load capacitance applied to the
external crystal when typical PCB parasitics are added.
The MAX7058 is designed to operate with a typical
10pF load capacitance crystal. It is very important to
use a crystal with a load capacitance equal to the
capacitance of the MAX7058 crystal oscillator plus
PCB parasitics. If a crystal designed to oscillate with a
different load capacitance is used, the crystal is pulled
away from its stated operating frequency, introducing
CAPACITOR
CONTROL PIN STATE
ADDED SHUNT CAPACITANCE
IN pF
an error in the reference frequency. A crystal designed
to operate at a higher load capacitance than the value
specified for the oscillator will always be pulled higher
(CAP4 – CAP1)
0000
0001
0010
0011
0100
0101
0110
0111
1000
315MHz (÷21)
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
390MHz (÷26)
0
in frequency. Adding capacitance to increase the load
capacitance on the crystal will increase the startup time
and may prevent oscillation altogether.
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 ?
2 ? C case + C load
C case + C spec ?
1001
1010
1011
1100
4.5
5.0
5.5
6.0
f p =
1 1 ?
? ? ? × 100 6
1101
1110
1111
6.5
7.0
7.5
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
Phase-Locked Loop
The MAX7058 utilizes a fully integrated, programmable
PLL for its frequency synthesizer. All PLL components
including the loop filter are included on-chip. The divide
ratio is set at one of two fixed values: 21 (FSEL is set to
high) or 26 (FSEL is set to low).
C load is the actual load capacitance
C spec is the specified load capacitance
When the crystal is loaded as specified (i.e., C load =
C spec ), the frequency pulling equals zero.
10
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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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