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参数资料
| 型号： | MAX7057 |
| 厂商： | Maxim Integrated Products, Inc. |
| 英文描述： | 300MHz至450MHz频率可编程ASK/FSK发送器 |
| 中文描述： | 300MHz至450MHz频率可编程ASK/FSK发送器 |
| 文件页数： | 5/20页 |
| 文件大小： | 245K |
| 代理商： | MAX7057 |
Using a byte descriptive notation, the reset command
can be viewed as the following sequence, within the
same
CS cycle:
SDI:
<0x04>
Features and Settings
Values and parameters are set through registers in the
MAX7057 that are addressable through the SPI. These
registers contain bits that either turn functions on and
off or program numerical settings. The following set-
tings are controlled through the SPI.
Variable Capacitor
The internal variable shunt capacitor, which is instru-
mental in matching the PA to the antenna, is controlled
by setting 5 bits in the configuration 0 register. This
allows for 32 levels of shunt capacitance control. Since
the control of these 5 bits is independent of the other
settings, any capacitance value can be chosen at any
frequency, making it possible to maintain maximum
transmitter efficiency while moving rapidly from one fre-
quency to another.
Clock Output
The MAX7057 has a buffered clock output that can
serve as a clock for a microprocessor. The divide ratio
is set through the configuration 0 register (see Tables 5
and 6). The divide settings are 1 (no division), 2, 4, 8, or
16; the original undivided frequency is based on the
reference frequency generated by the external crystal.
The buffered clock output is available at GPO when
enabled by setting the configuration 1 register (see
Tables 2, 3, 15, and 16).
Mode Select and Crystal Shutdown
The transmission mode is selected by writing to a regis-
ter. The default mode is ASK and the mode can be
changed to FSK by writing a 1 to the mode bit in the
control register. This register is also used to keep the
crystal circuit powered up in the shutdown mode.
Registers
The following tables provide information on the
MAX7057 registers.
MAX7057
300MHz to 450MHz Frequency-Programmable
ASK/FSK Transmitter
______________________________________________________________________________________
13
SDI
SCLK
CS
RESET COMMAND (0x04)
ADDRESS
REGISTER NAME
DESCRIPTION
0x00
CONTRL
Control register. Controls the mode (ASK/FSK), crystal clock output, envelope-shaping, PLL
bandwidth, and SPI enable.
0x01
CONFIG0
Configuration 0 register. Controls the capacitance at the PA output and clock output
frequency divider.
0x02
HIFREQ1
High-frequency 1 register (upper byte). Sets the high frequency in FSK transmission.
0x03
HIFREQ0
High-frequency 0 register (lower byte). Sets the high frequency in FSK transmission.
0x04
LOFREQ1
Low-frequency 1 register (upper byte). Sets the low frequency in FSK transmission, or
carrier frequency in ASK transmission.
0x05
LOFREQ0
Low-frequency 0 register (lower byte). Sets the low frequency in FSK transmission, or carrier
frequency in ASK transmission.
0x06
FLOAD
Frequency load register. Performs the frequency load function.
0x07
DATAIN
Data in register. SPI equivalent of DIN pin.
0x08
EN
Enable register. SPI equivalent of ENABLE pin.
0x09
CONFIG1
Configuration 1 register. GPO selector.
0x0C
STATUS
Status register.
Figure 6. Reset Command Format
Table 2. Register Summary
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX7057_11 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:300MHz to 450MHz Frequency-Programmable ASK/FSK Transmitter |
| MAX7057ASE | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:300MHz to 450MHz Frequency-Programmable ASK/FSK Transmitter |
| MAX7057ASE+ | 功能描述:射频发射器 300-450MHz f-Prog ASK/FSK Transmitter RoHS:否 制造商:Micrel 类型:ASK Transmitter 封装 / 箱体:SOT-23-6 工作频率:300 MHz to 450 MHz 封装:Reel |
| MAX7057ASE+T | 功能描述:射频发射器 300-450MHz f-Prog ASK/FSK Transmitter RoHS:否 制造商:Micrel 类型:ASK Transmitter 封装 / 箱体:SOT-23-6 工作频率:300 MHz to 450 MHz 封装:Reel |
| MAX7057EVKIT+ | 制造商:Maxim Integrated Products 功能描述:300MHZ TO 450MHZ FULLY PROGRAMMABLE ASK/FSK TRANSMITTER - Boxed Product (Development Kits) |
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