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MAX2031 Schematic ( PDF Datasheet ) - Maxim Integrated Products

Teilenummer MAX2031
Beschreibung 815MHz to 1000MHz Upconversion/ Downconversion Mixer
Hersteller Maxim Integrated Products
Logo Maxim Integrated Products Logo 




Gesamt 16 Seiten
MAX2031 Datasheet, Funktion
19-0248; Rev 0; 7/05
www.DataSheet4U.com
EVAALVUAAILTAIOBNLEKIT
High-Linearity, 815MHz to 1000MHz Upconversion/
Downconversion Mixer with LO Buffer/Switch
General Description
The MAX2031 high-linearity passive upconverter or
downconverter mixer is designed to provide +36dBm
IIP3, 7dB NF, and 7dB conversion loss for an 815MHz
to 1000MHz RF frequency range to support GSM/cellu-
lar base-station transmitter or receiver applications.
With a 960MHz to 1180MHz LO frequency range, this
particular mixer is ideal for high-side LO injection archi-
tectures. For a pin-to-pin-compatible mixer meant for
low-side LO injection, contact the factory.
In addition to offering excellent linearity and noise per-
formance, the MAX2031 also yields a high level of com-
ponent integration. This device includes a double-
balanced passive mixer core, a dual-input LO selec-
table switch, and an LO buffer. On-chip baluns are also
integrated to allow for a single-ended RF input for
downconversion (or RF output for upconversion), and
single-ended LO inputs. The MAX2031 requires a nomi-
nal LO drive of 0dBm, and supply current is guaranteed
to be below 100mA.
The MAX2031 is pin compatible with the MAX2039/
MAX2041* 1700MHz to 2200MHz mixers, making this
family of passive upconverters and downconverters
ideal for applications where a common PC board layout
is used for both frequency bands.
The MAX2031 is available in a compact 20-pin thin
QFN package (5mm x 5mm) with an exposed paddle.
Electrical performance is guaranteed over the extended
-40°C to +85°C temperature range.
Applications
Cellular Band WCDMA
and cdma2000® Base
Stations
GSM 850/GSM 900 2G
and 2.5G EDGE Base
Stations
Integrated Digital
Enhanced Network
(iDEN®) Base Stations
WiMAX(SM) Base Stations
and Customer Premise
Equipment
Predistortion Receivers
Microwave and Fixed
Broadband Wireless
Access
Wireless Local Loop
Digital and Spread-
Spectrum
Communication Systems
*Future product—contact factory for availability.
cdma2000 is a registered trademark of Telecommunications
Industry Association.
iDEN is a registered trademark of Motorola, Inc.
WiMAX is a service mark of Bandwidth.com, Inc.
Features
o 815MHz to 1000MHz RF Frequency Range
o 960MHz to 1180MHz LO Frequency Range
o 325MHz to 850MHz LO Frequency Range
(Contact Factory)
o DC to 250MHz IF Frequency Range
o 7dB Conversion Loss
o +36dBm Input IP3
o +27dBm Input 1dB Compression Point
o 7dB Noise Figure
o Integrated LO Buffer
o Integrated RF and LO Baluns
o Low -3dBm to +3dBm LO Drive
o Built-In SPDT LO Switch with 49dB LO1 to LO2
Isolation and 50ns Switching Time
o Pin Compatible with the MAX2039/MAX2041
1700MHz to 2200MHz Mixers
o External Current-Setting Resistor Provides Option
for Operating Mixer in Reduced-Power/Reduced-
Performance Mode
o Lead-Free Package Available
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
PKG
CODE
MAX2031ETP/-T
-40°C to +85°C
20 Thin QFN-EP**
(5mm x 5mm)
T2055-3
MAX2031ETP+/+T
-40°C to +85°C
20 Thin QFN-EP**
(5mm x 5mm)
T2055-3
**EP = Exposed paddle.
+Denotes lead-free package.
Pin Configuration/
Functional Diagram
TOP VIEW
20 19 18 17 16
VCC 1
RF 2
TAP 3
GND 4
GND 5
E.P.
MAX2031
15 LO2
14 VCC
13 GND
12 GND
11 LO1
6 7 8 9 10
________________________________________________________________ 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.






MAX2031 Datasheet, Funktion
www.DataSheet4U.com
High-Linearity, 815MHz to 1000MHz Upconversion/
Downconversion Mixer with LO Buffer/Switch
Typical Operating Characteristics (continued)
(Typical Application Circuit, C5 = 2pF, L1 and C4 not used, VCC = +5.0V, PLO = 0dBm, PRF = 0dBm, fLO > fRF, fIF = 160MHz, unless
otherwise noted.)
Downconverter Curves
2LO - 2RF RESPONSE
vs. RF FREQUENCY
95
PRF = 0dBm
TC = +25°C
85
TC = +85°C
2LO - 2RF RESPONSE
vs. RF FREQUENCY
95
PRF = 0dBm PLO = 0dBm PLO = -3dBm
85
2LO - 2RF RESPONSE
vs. RF FREQUENCY
95
PRF = 0dBm
VCC = 4.75V, 5.0V
85
75 75
75
65
TC = -25°C
55 TC = -40°C
65 PLO = +3dBm
55
65 VCC = 5.25V
55
45
800
850 900 950
RF FREQUENCY (MHz)
3LO - 3RF RESPONSE
vs. RF FREQUENCY
100
PRF = 0dBm
TC = +25°C
90
TC = +85°C
80
1000
45
800
850 900 950
RF FREQUENCY (MHz)
3LO - 3RF RESPONSE
vs. RF FREQUENCY
100
PRF = 0dBm
90 PLO = 0dBm
1000
80
45
800
850 900 950
RF FREQUENCY (MHz)
3LO - 3RF RESPONSE
vs. RF FREQUENCY
100
PRF = 0dBm
90 VCC = 5.25V
1000
80
70
60
800
TC = -40°C, -25°C
850 900 950
RF FREQUENCY (MHz)
1000
70
60
800
PLO = -3dBm
PLO = +3dBm
850 900 950
RF FREQUENCY (MHz)
1000
70
60
800
VCC = 5.0V
VCC = 4.75V
850 900 950
RF FREQUENCY (MHz)
1000
INPUT P1dB vs. RF FREQUENCY
32
TC = -40°C
30
INPUT P1dB vs. RF FREQUENCY
32
30 PLO = 0dBm, +3dBm
INPUT P1dB vs. RF FREQUENCY
32
VCC = 5.25V
30
28
TC = -25°C, +85°C
TC = +25°C
26
28
PLO = -3dBm
26
28
VCC = 4.75V
26 VCC = 5.0V
24
800
850 900 950
RF FREQUENCY (MHz)
1000
24
800
850 900 950
RF FREQUENCY (MHz)
1000
24
800
850 900 950
RF FREQUENCY (MHz)
6 _______________________________________________________________________________________
1000

6 Page









MAX2031 pdf, datenblatt
www.DataSheet4U.com
High-Linearity, 815MHz to 1000MHz Upconversion/
Downconversion Mixer with LO Buffer/Switch
Pin Description
PIN NAME
FUNCTION
1, 6, 8, 14
VCC
Power-Supply Connection. Bypass each VCC pin to GND with capacitors as shown in the Typical
Application Circuit.
2 RF Single-Ended 50RF Input/Output. This port is internally matched and DC shorted to GND through a balun.
3 TAP Center Tap of the Internal RF Balun. Connect to ground.
4, 5, 10, 12,
13, 16, 17, 20
GND Ground
7 LOBIAS Bias Resistor for Internal LO Buffer. Connect a 523±1% resistor from LOBIAS to the power supply.
9 LOSEL Local Oscillator Select. Logic-control input for selecting LO1 or LO2.
11 LO1 Local Oscillator Input 1. Drive LOSEL low to select LO1.
15 LO2 Local Oscillator Input 2. Drive LOSEL high to select LO2.
18, 19
IF-, IF+ Differential IF Input/Outputs
EP GND Exposed Ground Paddle. Solder the exposed paddle to the ground plane using multiple vias.
Detailed Description
The MAX2031 can operate either as a downconverter or
an upconverter mixer that provides approximately 7dB of
conversion loss with a typical 7dB noise figure. IIP3 is
+36dBm for both upconversion and downconversion
modes. The integrated baluns and matching circuitry
allow for 50single-ended interfaces to the RF port and
the two LO ports. The RF port can be used as an input
for downconversion or an output for upconversion. A sin-
gle-pole, double-throw (SPDT) switch provides 50ns
switching time between the two LO inputs with 49dB of
LO-to-LO isolation. Furthermore, the integrated LO buffer
provides a high drive level to the mixer core, reducing
the LO drive required at the MAX2031s inputs to a
-3dBm to +3dBm range. The IF port incorporates a dif-
ferential output for downconversion, which is ideal for
providing enhanced IIP2 performance. For upconver-
sion, the IF port is a differential input.
Specifications are guaranteed over broad frequency
ranges to allow for use in cellular band WCDMA,
cdmaOne, cdma2000, and GSM 850/GSM 900 2.5G
EDGE base stations. The MAX2031 is specified to oper-
ate over an 815MHz to 1000MHz RF frequency range, a
960MHz to 1180MHz LO frequency range, and a DC to
250MHz IF frequency range. Operation beyond these
ranges is possible; see the Typical Operating
Characteristics for additional details.
The MAX2031 is optimized for high-side LO injection
architectures. However, the device can operate in low-
side LO injection applications with an extended LO
range, but performance degrades as fLO decreases. See
cdmaOne is a trademark of CDMA Development Group.
the Typical Operating Characteristics for measurements
taken with fLO below 960MHz. For a pin-compatible
device that has been optimized for LO frequencies below
960MHz, contact the factory.
RF Port and Balun
For using the MAX2031 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. For upconverter
operation, the RF port is a single-ended output similarly
matched to 50.
LO Inputs, Buffer, and Balun
The MAX2031 is optimized for high-side LO injection
architectures with a 960MHz to 1180MHz LO frequency
range. For a device with a 325MHz to 850MHz LO fre-
quency range, contact the factory. As an added fea-
ture, the MAX2031 includes an internal LO SPDT switch
that can be used for frequency-hopping applications.
The switch selects one of the two single-ended LO
ports, allowing the external oscillator to settle on a par-
ticular frequency before it is switched in. LO switching
time is typically less than 50ns, which is more than ade-
quate for nearly all GSM applications. If frequency hop-
ping is not employed, set the switch to either of the LO
inputs. The switch is controlled by a digital input
(LOSEL): logic-high selects LO2, logic-low selects LO1.
To avoid damage to the part, voltage MUST be applied
to VCC before digital logic is applied to LOSEL (see the
Absolute Maximum Ratings). LO1 and LO2 inputs are
internally matched to 50, requiring an 82pF DC-block-
ing capacitor at each input.
12 ______________________________________________________________________________________

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