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PDF MAX2023 Data sheet ( Hoja de datos )
| Número de pieza | MAX2023 | |
| Descripción | High Dynamic Range Direct Up / Down Conversion Quadrature Mod / Demod | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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19-0564; Rev 0; 7/06
EVAALVUAAILTAIOBNLEKIT
High-Dynamic-Range, Direct Up-/Downconversion
1500MHz to 2300MHz Quadrature Mod/Demod
General Description
The MAX2023 low-noise, high-linearity, direct upconver-
sion/downconversion quadrature modulator/demodulator
is designed for single and multicarrier 1500MHz to
2300MHz DCS 1800/PCS 1900 EDGE, cdma2000®,
WCDMA, and PHS/PAS base-station applications.
Direct conversion architectures are advantageous
since they significantly reduce transmitter or receiver
cost, part count, and power consumption as compared
to traditional IF-based double-conversion systems.
In addition to offering excellent linearity and noise perfor-
mance, the MAX2023 also yields a high level of compo-
nent integration. This device includes two matched
passive mixers for modulating or demodulating in-phase
and quadrature signals, two LO mixer amplifier drivers,
and an LO quadrature splitter. On-chip baluns are also
integrated to allow for single-ended RF and LO connec-
tions. As an added feature, the baseband inputs have
been matched to allow for direct interfacing to the trans-
mit DAC, thereby eliminating the need for costly I/Q
buffer amplifiers.
The MAX2023 operates from a single +5V supply. It is
available in a compact 36-pin thin QFN package (6mm
x 6mm) with an exposed paddle. Electrical perfor-
mance is guaranteed over the extended -40°C to
+85°C temperature range.
Applications
Single-Carrier DCS 1800/PCS 1900 EDGE Base
Stations
Single and Multicarrier WCDMA/UMTS Base
Stations
Single and Multicarrier cdmaOne™ and cdma2000
Base Stations
Predistortion Transmitters and Receivers
PHS/PAS Base Stations
Fixed Broadband Wireless Access
Military Systems
Microwave Links
Digital and Spread-Spectrum Communication
Systems
Video-on-Demand (VOD) and DOCSIS Compliant
Edge QAM Modulation
Cable Modem Termination Systems (CMTS)
cdma2000 is a registered trademark of Telecommunications
Industry Association.
cdmaOne is a trademark of CDMA Development Group.
Features
o 1500MHz to 2300MHz RF Frequency Range
o Scalable Power: External Current-Setting
Resistors Provide Option for Operating Device in
Reduced-Power/Reduced-Performance Mode
o 36-Pin, 6mm x 6mm TQFN Provides High Isolation
in a Small Package
Modulator Operation:
o Meets GSM Spurious Emission of -75dBc at
600kHz Offset at POUT = +6dBm
o +23.5dBm Typical OIP3
o +61dBm Typical OIP2
o +16dBm Typical OP1dB
o -54dBm Typical LO Leakage
o 48dBc Typical Sideband Suppression
o -165dBc/Hz Output Noise Density
o Broadband Baseband Input of 450MHz Allows a
Direct Launch DAC Interface, Eliminating the
Need for Costly I/Q Buffer Amplifiers
o DC-Coupled Input Allows Ability for Offset
Voltage Control
Demodulator Operation:
o +38dBm Typical IIP3
o +59dBm Typical IIP2
o +30dBm Typical IP1dB
o 9.5dB Typical Conversion Loss
o 9.6dB Typical NF
o 0.025dB Typical I/Q Gain Imbalance
o 0.56° I/Q Typical Phase Imbalance
Ordering Information
PART
TEMP RANGE
MAX2023ETX -40°C to +85°C
MAX2023ETX-T -40°C to +85°C
MAX2023ETX+ -40°C to +85°C
MAX2023ETX+T -40°C to +85°C
PIN-
PACKAGE
36 Thin QFN-EP*
(6mm x 6mm)
36 Thin QFN-EP*
(6mm x 6mm)
36 Thin QFN-EP*
(6mm x 6mm)
36 Thin QFN-EP*
(6mm x 6mm)
PKG
CODE
T3666-2
T3666-2
T3666-2
T3666-2
*EP = Exposed paddle.
+Denotes lead-free package.
T = Tape-and-reel package.
_______________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
DataSheet4 U .com
1 page  
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High-Dynamic-Range, Direct Up-/Downconversion
1500MHz to 2300MHz Quadrature Mod/Demod
Typical Operating Characteristics (continued)
(MAX2023 Typical Application Circuit, VCC = +4.75V to +5.25V, GND = 0V, I/Q differential inputs driven from a 100Ω DC-coupled source
(modulator), VBBI = VBBQ = 2.6VP-P differential (modulator), PRF = +6dBm (demodulator), I/Q differential output drives 50Ω differential load
(demodulator), 0V common-mode input/output, PLO = 0dBm, 1500MHz ≤ fLO ≤ 2300MHz, 50Ω LO and RF system impedance, R1 = 432Ω,
MODULATOR OUTPUT IP3
vs. LO FREQUENCY
30
28
PLO = 0dBm
f1 = 1.8MHz
f2 = 1.9MHz
26
24 PLO = +3dBm
22
20
PLO = -3dBm
18
16
14
12
10
1.5 1.6 1.7 1.8 1.9 2.0 2.1 2.2 2.3
LO FREQUENCY (GHz)
MODULATOR OUTPUT IP2
vs. LO FREQUENCY
80
VCC = 5.25V
75
70 VCC = 5V
65
60
VCC = 4.75V
55 f1 = 1.8MHz
f2 = 1.9MHz
50
1.5 1.6 1.7 1.8 1.9 2.0 2.1 2.2 2.3
LO FREQUENCY (GHz)
MODULATOR OUTPUT POWER
vs. INPUT POWER
20
18
16
14 VCC = 4.75V, 5V, 5.25V
12
10
8
6
4
2
0
10 12 14 16 18 20 22 24 26 28 30
INPUT POWER (dBm)
MODULATOR OUTPUT IP3
vs. I/Q COMMON-MODE VOLTAGE
26.0
f1 = 1.8MHz
25.5 f2 = 1.9MHz
25.0
24.5
24.0
23.5
23.0
22.5
22.0
-3.5 -2.5 -1.5 -0.5 0.5 1.5 2.5
I/Q COMMON-MODE VOLTAGE (V)
MODULATOR OUTPUT IP2
vs. LO FREQUENCY
80
3.5
75
PLO = -3dBm
70
PLO = 0dBm
65
60 PLO = +3dBm
55 f1 = 1.8MHz
f2 = 1.9MHz
50
1.5 1.6 1.7 1.8 1.9 2.0 2.1 2.2 2.3
LO FREQUENCY (GHz)
MODULATOR OUTPUT POWER
vs. INPUT POWER
20
PLO = +3dBm
18
PLO = 0dBm
16
14
12
10 PLO = -3dBm
8
6
4
2
0
10 12 14 16 18 20 22 24 26 28 30
INPUT POWER (dBm)
MODULATOR OUTPUT IP2
vs. LO FREQUENCY
80
75 TC = +85°C TC = +25°C
70
65
60 TC = -40°C
55 f1 = 1.8MHz
f2 = 1.9MHz
50
1.5 1.6 1.7 1.8 1.9 2.0 2.1 2.2 2.3
LO FREQUENCY (GHz)
MODULATOR OUTPUT IP2
vs. I/Q COMMON-MODE VOLTAGE
68
67
66
65
64
63
62
61
60
-3.5
f1 = 1.8MHz
f2 = 1.9MHz
-2.5 -1.5 -0.5 0.5 1.5 2.5 3.5
I/Q COMMON-MODE VOLTAGE (V)
MODULATOR OUTPUT POWER
vs. LO FREQUENCY
8
7 TC = -40°C
6
5
TC = +25°C
4
TC = +85°C
3
2
1.5 1.6 1.7 1.8 1.9 2.0 2.1 2.2 2.3
LO FREQUENCY (GHz)
_________________________________________________________________________________________________ 5
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High-Dynamic-Range, Direct Up-/Downconversion
1500MHz to 2300MHz Quadrature Mod/Demod
soidal baseband signals, a level of 89mVP-P differential
on the I and the Q inputs results in a -17dBm input
power level delivered to the I and Q internal 50Ω termi-
nations. This results in an RF output power of -26.6dBm.
External Diplexer
LO leakage at the RF port can be nulled to a level less
than -80dBm by introducing DC offsets at the I and Q
ports. However, this null at the RF port can be compro-
mised by an improperly terminated I/Q IF interface. Care
must be taken to match the I/Q ports to the driving DAC
circuitry. Without matching, the LO’s second-order (2fLO)
term may leak back into the modulator’s I/Q input port
where it can mix with the internal LO signal to produce
additional LO leakage at the RF output. This leakage
effectively counteracts against the LO nulling. In addi-
tion, the LO signal reflected at the I/Q IF port produces a
residual DC term that can disturb the nulling condition.
As demonstrated in Figure 3, providing an RC termination
on each of the I+, I-, Q+, Q- ports reduces the amount of
LO leakage present at the RF port under varying temper-
ature, LO frequency, and baseband termination condi-
tions. See the Typical Operating Characteristics for
details. Note that the resistor value is chosen to be 50Ω
with a corner frequency 1 / (2πRC) selected to adequate-
ly filter the fLO and 2fLO leakage, yet not affecting the flat-
ness of the baseband response at the highest baseband
frequency. The common-mode fLO and 2fLO signals at
I+/I- and Q+/Q- effectively see the RC networks and thus
C = 2.2pF
I L = 11nH
MAX2023
50Ω RF MODULATOR
50Ω
C = 2.2pF LO
0°
90°
∑
Q L = 11nH
50Ω
50Ω
C = 2.2pF
Figure 3. Diplexer Network Recommended for DCS 1800/
PCS 1900 EDGE Transmitter Applications
become terminated in 25Ω (R/2). The RC network pro-
vides a path for absorbing the 2fLO and fLO leakage,
while the inductor provides high impedance at fLO and
2fLO to help the diplexing process.
RF Demodulator
The MAX2023 can also be used as an RF demodulator,
downconverting an RF input signal directly to base-
band. The single-ended RF input accepts signals from
1500MHz to 2300MHz with power levels up to +30dBm.
The passive mixer architecture produces a conversion
loss of typically 9.5dB. The downconverter is optimized
for high linearity and excellent noise performance, typi-
cally with a +38dBm IIP3, an input P1dB of +29.7dBm,
and a 9.6dB noise figure.
A wide I/Q port bandwidth allows the port to be used as
an image-reject mixer for downconversion to a quadra-
ture IF frequency.
The RF and LO inputs are internally matched to 50Ω.
Thus, no matching components are required, and only
DC-blocking capacitors are needed for interfacing.
Power Scaling with Changes
to the Bias Resistors
Bias currents for the LO buffers are optimized by fine
tuning resistors R1, R2, and R3. Maxim recommends
using ±1%-tolerant resistors; however, standard ±5%
values can be used if the ±1% components are not
readily available. The resistor values shown in the
Typical Application Circuit were chosen to provide
peak performance for the entire 1500MHz to 2300MHz
band. If desired, the current can be backed off from
this nominal value by choosing different values for R1,
R2, and R3. Contact the factory for additional details.
Layout Considerations
A properly designed PC board is an essential part of
any RF/microwave circuit. Keep RF signal lines as short
as possible to reduce losses, radiation, and induc-
tance. For the best performance, route the ground pin
traces directly to the exposed paddle under the pack-
age. The PC board exposed paddle MUST be connect-
ed to the ground plane of the PC board. It is suggested
that multiple vias be used to connect this paddle to the
lower level ground planes. This method provides a
good RF/thermal conduction path for the device. Solder
the exposed paddle on the bottom of the device pack-
age to the PC board. The MAX2023 evaluation kit can
be used as a reference for board layout. Gerber files
are available upon request at www.maxim-ic.com.
________________________________________________________________________________________________ 11
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11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet MAX2023.PDF ] | |
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