Datasheet
MAX2039
Detailed Description
The MAX2039 can operate either as a downconverter
or an upconverter mixer that provides 7.1dB of conver-
sion loss with a typical 7.3dB noise figure. IIP3 is
+33.5dBm for upconversion and +34.5dBm for down-
conversion. The integrated baluns and matching cir-
cuitry allow for 50Ω single-ended interfaces to the RF
port and two LO ports. The RF port can be used as an
input for downconversion or an output for upconver-
sion. A single-pole, double-throw (SPDT) switch pro-
vides 50ns switching time between the two LO inputs
with 45dB of LO-to-LO isolation. Furthermore, the inte-
grated LO buffer provides a high drive level to the
mixer core, reducing the LO drive required at the
MAX2039’s inputs to a range of -3dBm to +3dBm. The
IF port incorporates a differential output for downcon-
version, which is ideal for providing enhanced IIP2 per-
formance. For upconversion, the IF port is a differential
input.
Specifications are guaranteed over broad frequency
ranges to allow for use in UMTS, cdma2000, and
2G/2.5G/3G DCS1800, and PCS1900 base stations.
The MAX2039 is specified to operate over an RF fre-
quency range of 1700MHz to 2200MHz, an LO frequen-
cy range of 1500MHz to 2000MHz, and an IF frequency
range of DC to 350MHz. Operation beyond these
ranges is possible; see the Typical Operating
Characteristics for additional details.
This device can operate in high-side LO injection appli-
cations with an extended LO range, but performance
degrades as f
LO
continues to increase. See the Typical
Operating Characteristics for measurements taken with
f
LO
up to 2200MHz. For a device with better high-side
LO injection performance, contact the factory.
RF Port and Balun
For using the MAX2039 as a downconverter, the RF input
is internally matched to 50Ω, requiring no external match-
ing components. A DC-blocking capacitor is required
since the input is internally DC shorted to ground through
the on-chip balun. The RF return loss is typically 18dB
over the entire 1700MHz to 2200MHz RF frequency
range. For upconverter operation, the RF port is a single-
ended output similarly matched to 50Ω.
LO Inputs, Buffer, and Balun
The MAX2039 can be used for either high-side or low-
side injection applications with a 1500MHz to 2000MHz
LO frequency range. For a device with a 1900MHz to
2400MHz LO frequency range, contact the factory. As
an added feature, the MAX2039 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 particular frequency before it is switched in. LO
switching time is typically less than 50ns, which is more
than adequate for virtually all GSM applications.
High-Linearity, 1700MHz to 2200MHz Upconversion/
Downconversion Mixer with LO Buffer/Switch
12 ______________________________________________________________________________________
Pin Description
PIN NAME FUNCTION
1, 6, 8, 14
V
CC
Power-Supply Connection. Bypass each V
CC
pin to GND with capacitors as shown in the Typical
Application Circuit.
2RF
Single-Ended 50Ω RF Input/Output. This port is internally matched and DC shorted to GND through a
balun.
3 TAP
Center Tap of the Internal RF Balun. Bypass to GND with capacitors close to the IC, as shown in the
Typical Application Circuit.
4, 5, 10, 12,
13, 16, 17,
20
GND Ground
7
LOBIAS
Bias Resistor for Internal LO Buffer. Connect a 549Ω 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.