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參數(shù)資料
| 型號(hào)： | MAX2307 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Low-Power Cellular Upconverter-Driver |
| 中文描述： | 低功耗、蜂窩系統(tǒng)上變換器-驅(qū)動(dòng)器 |
| 文件頁(yè)數(shù)： | 7/8頁(yè) |
| 文件大?。?/td> | 211K |
| 代理商： | MAX2307 |
M
Low-Power Cellular Upconverter-Driver
_______________________________________________________________________________________
7
Applications Information
Local Oscillator LOIN/
SHDNLO
Input
The LO input is a single-ended broadband port. The
LO signal is mixed with the input IF signal and the
resulting upconverted output appears on the RFOUT
pin. AC-couple the LO pin with a capacitor having less
than 3
reactance at the LO frequency. This device
also contains an internal LO buffer and supports an LO
signal ranging from -15dBm to -5dBm.
SHDNLO
turns the LO buffer on and off independent of
the rest of the IC and shares the same pin as LOIN. To
avoid loading of the LO, connect a 10k
isolation resis-
tor between the LOIN/
SHDNLO
pin and the
SHDNLO
logic output. The
SHDNLO
control can help reduce
VCO pulling in gated-transmission mode by providing a
means to keep the LO buffer on while the upconverter
and driver turn on and off.
IF Input
The MAX2307 has a differential IF input port for inter-
facing to differential IF filters. AC-couple the IF pins
with a capacitor. The typical IF input frequency is
165MHz, but device can operate from 130MHz to
230MHz. The differential impedance between the two
IF inputs is approximately 400
in parallel with 0.5pF.
Mixer
The MAX2307 uses a double-balanced differential
upconverting mixer. Two inductors connecting the
mixer output pins (A2 and A3) to V
CC
in conjunction
with an on-chip capacitor achieve image suppression.
This method allows image rejection with no current con-
sumption penalty, and permits much higher Q than
using on-chip inductors to ensure sufficient selectivity
for image rejection. The Q of the off-chip tank inductor
directly determines the image suppression level and
usable bandwidth.
The MAX2307 also provides a continuous variable gain
function, enabling at least 20dB of gain control using
an external control voltage input.
PA Driver
The MAX2307 utilizes a class AB driver stage. Unlike
class A or B, class AB action offers both good linearity
and low current consumption. Current consumption of
class AB is proportional to the output power at high
drive levels.
RFOUT is an open-collector output that requires an
external inductor to V
CC
for proper biasing. For opti-
mum performance, implement an impedance-matching
network. The configuration and values for the matching
network depend on the transmit frequency, perfor-
mance, and desired output impedance. For simultane-
ous optimum linearity and return loss, the real part of
the load impedance should be about 100
. The
device
’
s internal 0.5pF shunt parasitic needs to be
absorbed by the matching network. For matching net-
work values for the Japanese cellular transmit band,
see the MAX2307 EV kit data sheet.
Layout Issues
For best performance, pay close attention to power-
supply issues, as well as to the layout of the RFOUT
matching network. The EV kit can be used as a layout
example. Ground connections and supply bypassing
are the most important.
Power Supply and SHDN
_
Bypassing
Bypass V
CC
with a 100pF capacitor in parallel with a
0.01μF RF capacitor. Use separate vias to the ground
plane for each of the bypass capacitors and minimize
trace length to reduce inductance. Use three separate
vias to the ground plane for each ground pin.
Power-Supply Layout
To minimize coupling between different sections of the
IC, the ideal power-supply layout is a star configuration
with a large decoupling capacitor at a central V
CC
node. The V
CC
traces branch out from this central
node, each going to a separate V
CC
node in the PC
board. At the end of each trace is a bypass capacitor
with low ESR at the RF frequency of operation. This
arrangement provides local decoupling at each V
CC
pin. At high frequencies, any signal leaking out of one
supply pin sees a relatively high impedance (formed by
the V
CC
trace inductance) to the central V
CC
node, and
an even higher impedance to any other supply pin, as
VCCMIXP
V
CC
V
CC
V
CC
V
CC
V
CC
V
CC
RFOUT
RFOUT
GND
GC
V
GC
R2
10k
IFINP
IF INPUT
IFINM
GND
VCCMIXM
C3
4.7
μ
F
R1
10k
C2
0.01
μ
F
C14
0.01
μ
F
C7
0.01
μ
F
C12
0.01
μ
F
C13
100pF
C6
100pF
C16
3.0pF
L4
6.2nH
L1
5.6nH
L2
5.6nH
C1
100pF
C4
100pF
SHDN
SHDN
SHDNLO
LOIN/SHDNLO
LOIN
MAX2307
Typical Operating Circuit
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX2335_1 | Evaluation Kit |
| MAX2335EVKIT | Evaluation Kit |
| MAX2335 | 450MHz CDMA/OFDM LNA/Mixer |
| MAX2335ETI | 450MHz CDMA/OFDM LNA/Mixer |
| MAX2363W | Evaluation Kits |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX2307EBC DIE | 制造商:Maxim Integrated Products 功能描述: |
| MAX2307EBC-T | 功能描述:上下轉(zhuǎn)換器 RoHS:否 制造商:Texas Instruments 產(chǎn)品:Down Converters 射頻:52 MHz to 78 MHz 中頻:300 MHz LO頻率: 功率增益: P1dB: 工作電源電壓:1.8 V, 3.3 V 工作電源電流:120 mA 最大功率耗散:1 W 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFP-128 |
| MAX2307EVKIT | 功能描述:射頻開發(fā)工具 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 |
| MAX2308EGI | 功能描述:調(diào)節(jié)器/解調(diào)器 CDMA If VGAs & I/Q Demodulator w/VCO RoHS:否 制造商:Texas Instruments 封裝 / 箱體:PVQFN-N24 封裝:Reel |
| MAX2308EGI-T | 功能描述:調(diào)節(jié)器/解調(diào)器 CDMA If VGAs & I/Q Demodulator w/VCO RoHS:否 制造商:Texas Instruments 封裝 / 箱體:PVQFN-N24 封裝:Reel |
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