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參數(shù)資料
| 型號(hào)： | MAX1479 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 300MHz to 450MHz Low-Power, Crystal-Based +10dBm ASK/FSK Transmitter |
| 中文描述： | 300MHz至450MHz、低功耗、基于晶振的+10dBm ASK/FSK發(fā)送器 |
| 文件頁(yè)數(shù)： | 6/11頁(yè) |
| 文件大?。?/td> | 635K |
| 代理商： | MAX1479 |
M
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 20μA
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 200μs (frequency settles to within
50kHz).
The 200μs 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
1
NAME
V
DD
DESCRIPTION
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
5
ENABLE
CLKOUT
Standby/Power-Up Input. A logic low on ENABLE sets the device in standby mode.
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
10
11
12
13
14
15
16
CLK0
CLK1
DEV0
DEV1
DEV2
XTAL1
XTAL2
GND
1st Clock Divider Setting. See Table 1.
2nd Clock Divider Setting. See Table 1.
1st FSK Frequency-Deviation Setting. See Table 2.
2nd FSK Frequency-Deviation Setting. See Table 2.
3rd FSK Frequency-Deviation Setting. See Table 2.
1st Crystal Input. f
RF
= 32 x f
XTAL
.
2nd Crystal Input. f
RF
= 32 x f
XTAL
.
Ground. Connect to system ground.
—
EP
Exposed Ground Paddle. EP is the power amplifier’s ground. It must be connected to PC board through a
low-inductance path.
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| MAX1479ATE | 功能描述:射頻發(fā)射器 RoHS:否 制造商:Micrel 類型:ASK Transmitter 封裝 / 箱體:SOT-23-6 工作頻率:300 MHz to 450 MHz 封裝:Reel |
| MAX1479ATE+ | 功能描述:射頻發(fā)射器 300MHz - 450MHz ASK/FSK Transmitter RoHS:否 制造商:Micrel 類型:ASK Transmitter 封裝 / 箱體:SOT-23-6 工作頻率:300 MHz to 450 MHz 封裝:Reel |
| MAX1479ATE+T | 功能描述:射頻發(fā)射器 300MHz - 450MHz ASK/FSK Transmitter RoHS:否 制造商:Micrel 類型:ASK Transmitter 封裝 / 箱體:SOT-23-6 工作頻率:300 MHz to 450 MHz 封裝:Reel |
| MAX1479ATE-T | 功能描述:射頻發(fā)射器 RoHS:否 制造商:Micrel 類型:ASK Transmitter 封裝 / 箱體:SOT-23-6 工作頻率:300 MHz to 450 MHz 封裝:Reel |
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