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參數(shù)資料
| 型號： | MAX2043ETX |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | 1700MHz to 3000MHz High-Linearity, Low LO Leakage Base-Station Rx/Tx Mixer |
| 中文描述： | TELECOM, CELLULAR, RF AND BASEBAND CIRCUIT, QCC36 |
| 封裝： | 6 X 6 MM, MO-220WJJD-1, TQFN-36 |
| 文件頁數(shù)： | 12/17頁 |
| 文件大?。?/td> | 404K |
| 代理商： | MAX2043ETX |
M
1700MHz to 3000MHz High-Linearity,
Low LO Leakage Base-Station Rx/Tx Mixer
12
______________________________________________________________________________________
Pin Description
PIN
NAME
FUNCTION
1
–
5, 7, 10,
11, 12, 15,
18, 20, 22,
24, 25, 26,
28, 29,
31
–
36
GND
These pins have no internal connection and can be left open or connected to ground. It is
suggested that these pins be grounded back to the exposed paddle where possible to improve pin-
to-pin isolation.
6, 16, 21, 30
V
CC
Power-Supply Connection. Connected to external power supply (5V). Bypass to GND with a 0.01μF
capacitor as close to the pin as possible.
8
9
RFTAP
RF
Center Tap of the Internal RF Balun. Connected to internal RF balun center tap.
Single-Ended 50
RF Input/Output. DC grounded internally.
IF+ IF- ( p or s) Differential IF Ports (50
). 0V common-mode voltage.
Adjust LO Drive. A 360
±1% resistor connected from this pin to ground sets the LO driver bias. A
1.1V DC voltage appears across this resistor.
13, 14
17
LO_ADJ
19
23
27
EP
LO1
LOSEL
LO2
GND
Local Oscillator Input 1. Drive LOSEL high to select LO1.
Local Oscillator Select. Logic 0 selects LO2 and 1 selects LO1.
Local Oscillator Input 2. Drive LOSEL low to select LO2.
Exposed Paddle. Ground the exposed paddle using multiple ground vias.
Detailed Description
The MAX2043 can operate as either a downconverter
or an upconverter mixer that provides 7.5dB of conver-
sion loss with a typical 7.8dB noise figure. IIP3 is
+31dBm for both upconversion and downconversion.
The integrated baluns and matching circuitry allow for
50
single-ended interfaces to the RF port and two LO
ports. The RF port can be used as an input for down-
conversion or an output for upconversion. A single-
pole, double-throw (SPDT) switch provides 50ns
switching time between the two LO inputs with 43dB of
LO-to-LO isolation and -52dBm of LO leakage.
Furthermore, the integrated LO buffer provides a high
drive level to the mixer core, reducing the LO drive
required at the MAX2043
’
s inputs to a -3dBm to +6dBm
range. The IF port incorporates a differential output for
downconversion, which is ideal for providing enhanced
IIP2 performance. For upconversion, the IF port is a dif-
ferential input.
Specifications are guaranteed over broad frequency
ranges to allow for use in UMTS/WCDMA and
2G/2.5G/3G DCS 1800, PCS 1900, cdma2000, and
WiMAX base stations. The MAX2043 is specified to
operate over a 1700MHz to 3000MHz RF input range, a
1900MHz to 3000MHz LO range, and an IF range of
near 0MHz to 350MHz. The external IF component sets
the lower frequency range.
RF Port and Balun
For using the MAX2043 as a downconverter, the RF
input is internally matched to 50
, requiring no external
matching components. A DC-blocking capacitor is
required because the input is internally DC shorted to
ground through the on-chip balun. The RF return loss is
typically 15dB over the entire 1700MHz to 3000MHz RF
frequency range. For upconverter operation, the RF
port is a single-ended output similarly matched to 50
.
An optional L-C BPF can be installed at the RF port to
improve some upconverter performance.
LO Inputs, Buffer, and Balun
The MAX2043 is optimized for a 1900MHz to 3000MHz
LO range. As an added feature, the MAX2043 includes
an internal LO SPDT switch that can be used for fre-
quency-hopping applications. The switch selects one
of the two single-ended LO ports, allowing the external
oscillator to settle on a particular frequency before it is
switched in. LO switching time is typically less than
50ns, which is more than adequate for typical GSM
applications. If frequency-hopping is not employed,
simply set the switch to either of the LO inputs. The
switch is controlled by a digital input (LOSEL): logic-
high selects LO1, logic-low selects LO2. LO1 and LO2
inputs are internally matched to 50
, requiring only a
22pF DC-blocking capacitor. To avoid damage to the
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