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| 型号： | MAX1479ATE+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 6/10页 |
| 文件大小： | 265K |
| 描述： | IC TRANSM ASK/FSK 16-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： | 300MHz ~ 450MHz |
| 应用： | ISM，车库门开启器，RKE |
| 调制或协议： | ASK，FSK，OOK |
| 数据传输率 - 最大： | 100 kbps |
| 功率 - 输出： | 2.7dBm ~ 16.1dBm |
| 电流 - 传输： | 6.7mA ~ 10.5mA |
| 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： | 16-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
300MHz to 450MHz Low-Power,
Crystal-Based +10dBm ASK/FSK Transmitter
6 _______________________________________________________________________________________
Detailed Description
The MAX1479 is a highly integrated ASK/FSK transmit-
ter operating over the 300MHz to 450MHz frequency
band. The device requires only a few external compo-
nents to complete a transmitter solution. The MAX1479
includes a complete PLL and a highly efficient power
amplifier. The device can be set into a 0.2nA low-power
shutdown mode.
Shutdown Mode
ENABLE (pin 4) is internally pulled down with a 20礎
current source. If it is left unconnected or pulled low,
the MAX1479 goes into a low-power shutdown mode.
In this mode, the supply current drops to 0.2nA. When
ENABLE is high, the device is enabled and is ready for
transmission after 200祍 (frequency settles to within
50kHz).
The 200祍 turn-on time of the MAX1479 is mostly domi-
nated by the crystal oscillator startup time. Once the
oscillator is running, the 300kHz PLL bandwidth allows
fast frequency recovery during power-amplifier toggling.
Mode Selection
MODE (pin 2) sets the MAX1479 in either ASK or FSK
mode. When MODE is set low, the device operates as
an ASK transmitter. If MODE is set high, the device
operates as an FSK transmitter. In the ASK mode, the
DIN pin controls the output of the power amplifier. A
logic low on DIN turns off the PA, and a logic high turns
on the PA. In the FSK mode, a logic low on the DIN pin
is represented by the low FSK frequency, and a logic-
high input is represented by the high FSK frequency.
(The ASK carrier frequency and the lower FSK frequen-
cy are the same.) The deviation is proportional to the
crystal load impedance and pulling capacitance. The
maximum frequency deviation is 55kHz for f
RF
=
315MHz and 80kHz for f
RF
= 433MHz.
Pin Description
PIN
NAME
DESCRIPTION
1
V
DD
Supply Voltage. Bypass to GND with a 10nF and 220pF capacitor as close to the pin as possible.
2
MODE
Mode Select. A logic low on MODE enables the device in ASK mode. A logic high on MODE enables the
device in FSK mode.
3
DIN
Data Input. Power amplifier is on when DIN is high in ASK mode. Frequency is high when DIN is high in
FSK mode.
4
ENABLE Standby/Power-Up Input. A logic low on ENABLE sets the device in standby mode.
5
CLKOUT Buffered Clock Output. Programmable through CLK0 and CLK1. See Table 1.
6
V
DD_
PA
Power-Amplifier Supply Voltage. Bypass to GND with a 10nF and 220pF capacitor as close to the pin as
possible.
7
ROUT
Envelope-Shaping Output. ROUT controls the power-amplifier envelope rise and fall. Bypass to GND with a
680pF and 220pF capacitor as close to the pin as possible.
8
PAOUT
Power-Amplifier Output. Requires a pullup inductor to the supply voltage, which can be part of the output-
matching network to an antenna.
9
CLK0
1st Clock Divider Setting. See Table 1.
10
CLK1
2nd Clock Divider Setting. See Table 1.
11
DEV0
1st FSK Frequency-Deviation Setting. See Table 2.
12
DEV1
2nd FSK Frequency-Deviation Setting. See Table 2.
13
DEV2
3rd FSK Frequency-Deviation Setting. See Table 2.
14
XTAL1
1st Crystal Input. f
RF
= 32 x f
XTAL
.
15
XTAL2
2nd Crystal Input. f
RF
= 32 x f
XTAL
.
16
GND
Ground. Connect to system ground.
EP
Exposed Ground Pad. EP is the power amplifiers ground. It must be connected to PCB through a low-
inductance ath.
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