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參數(shù)資料
| 型號(hào)： | MAX2370 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Complete 450MHz Quadrature Transmitter |
| 中文描述： | 完備的、450MHz正交發(fā)送器 |
| 文件頁數(shù)： | 9/19頁 |
| 文件大?。?/td> | 387K |
| 代理商： | MAX2370 |
current consumption and linearity performance. The
power-control range of the RF VGA is typically 44dB.
PA Driver
The MAX2370 includes a PA driver that is optimized for
the 410MHz to 500MHz RF frequency range. The PA
driver is an open-collector output and requires a pullup
inductor to V
CC
. The pullup inductor can act as a shunt
element in a shunt-series matching network.
Programmable Registers
The MAX2370 includes eight programmable registers
consisting of four divide registers, a configuration regis-
ter, an operational control register, a current control
register, and a test register. Each register consists of
24 bits. The 4 least significant bits (LSBs) are the regis-
ter
’
s address. The 20 most significant bits (MSBs) are
used for register data. All registers contain some
“
don
’
t
care
”
bits. These can be either a 0 or 1 and do not
affect operation (Figure 1). Data is shifted in MSB first,
followed by the 4-bit address. When
CS
is low, the
clock is active and data is shifted with the rising edge
of the clock. When
CS
transitions to high, the shift reg-
ister is latched into the register selected by the con-
tents of the address bits. Typical register settings for
the eight registers are shown in Table 1. The dividers
and control registers are programmed from the
SPI/QSPI/MICROWIRE-compatible serial port.
The RFM register sets the main frequency divide ratio
for the RF PLL. The RFR register sets the reference fre-
quency divide ratio. The RF VCO frequency can be
determined by the following:
RF VCO frequency = f
REF
x (RFM / RFR)
The IFM and IFR registers are similar:
IF VCO frequency = f
REF
x (IFM / IFR)
where f
REF
is the external reference frequency.
The operational control register (OPCTRL) controls the
state of the MAX2370. See Table 2 for a description of
each bit
’
s function.
The configuration register (CONFIG) sets the configura-
tion for the RF and IF PLL and the baseband I/Q input
levels. See Table 3 for a description of each bit
’
s function.
The current-control register (I
CC
CTRL) modifies the bias
current to accommodate different operating modes. In
the high-power mode, MPL = 1 sets the bias current and
conversion gain to deliver an output power of at least
+5.5dBm from the PA drivers. In the low-noise mode,
MPL = 0 reduces output noise by 2.5dB for any given
output power at the expense of 3.4dB less maximum
obtainable output power.
Power Management
Bias control is distributed among several functional
sections and can be controlled to accommodate many
different power-down modes as shown in Table 8.
The serial interface remains active during shutdown.
Setting bit SHDN_BIT = 0 or pin
SHDN
= GND powers
down the device. In either case, PLL programming and
register information is retained.
Applications Information
3-Wire Serial Interface
Figure 3 shows the 3-wire interface timing diagram. The
3-wire bus is SPI/QSPI/MICROWIRE compatible.
Electromagnetic Compliance
Considerations
To produce a low-spur and EMC-compliant transmitter,
minimize circular current-loop area to reduce H-field
radiation. To minimize circular current-loop area, bypass
all V
CC
pins as close to the device as possible and use
the distributed capacitance of a ground plane. To mini-
mize voltage drops, make V
CC
traces short and wide.
Program only the necessary bits in any register to mini-
mize cycling of the serial interface
’
s clock. RC filtering
can also be used to slow the clock edges on the 3-wire
interface, reducing high-frequency spectral content.
RC filtering also provides transient protection by shunt-
ing high frequencies to ground, while the series resis-
tance attenuates the transients for error-free operation.
The same applies to the logic input pins (
SHDN
,
TXGATE
,
IDLE
).
Place high-frequency bypass capacitors close to the
pins with a dedicated via for each capacitor to ground.
The 48-pin thin QFN-EP package provides minimal
ground inductance by using an exposed paddle under
the part. Provide at least five low-inductance vias under
the exposed paddle to ground. Use a solid ground
plane wherever possible. Any cutout in the ground
plane may act as a slot radiator and reduce its shield
effectiveness.
Keep RF LO traces as short as possible to reduce LO
radiation and susceptibility to interference.
IF Tank Design
The IF tank is fully differential. The external tank compo-
nents for 120MHz IF operation are shown in the
Typical
Application Circuit
. See Maxim Application Note
IF Tank
Design for the MAX2360
at www.maxim-ic.com for more
information on designing tanks for alternate IFs.
M
Complete 450MHz Quadrature Transmitter
_______________________________________________________________________________________
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| MAX2370ETM | 功能描述:射頻發(fā)射器 Complete 450MHz Quadrature Txr 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 |
| MAX2370ETM+ | 功能描述:射頻發(fā)射器 Complete 450MHz Quadrature Txr 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 |
| MAX2370ETM+T | 功能描述:射頻發(fā)射器 Complete 450MHz Quadrature Txr 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 |
| MAX2370ETM-T | 功能描述:射頻發(fā)射器 Complete 450MHz Quadrature Txr 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 |
| MAX2370EVKIT | 功能描述:射頻開發(fā)工具 MAX2370 Eval Kit RoHS:否 制造商:Taiyo Yuden 產(chǎn)品:Wireless Modules 類型:Wireless Audio 工具用于評(píng)估:WYSAAVDX7 頻率: 工作電源電壓:3.4 V to 5.5 V |
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