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High-Linearity, 815MHz to 1000MHz Upconversion/
Downconversion Mixer with LO Buffer/Switch
Pin Description
PIN
1, 6, 8, 14
2
3
4, 5, 10, 12,
13, 16, 17, 20
NAME
V CC
RF
TAP
GND
FUNCTION
Power-Supply Connection. Bypass each V CC pin to GND with capacitors as shown in the Typical
Application Circuit .
Single-Ended 50 Ω RF Input/Output. This port is internally matched and DC shorted to GND through a balun.
Center Tap of the Internal RF Balun. Connect to ground.
Ground. Connect to PCB ground plane for proper operation and improved pin-to-pin isolation.
7
LOBIAS Bias Resistor for Internal LO Buffer. Connect a 523 Ω ±1% resistor from LOBIAS to the power supply.
9
11
15
18, 19
EP
LOSEL
LO1
LO2
IF-, IF+
GND
Local Oscillator Select. Logic-control input for selecting LO1 or LO2.
Local Oscillator Input 1. Drive LOSEL low to select LO1.
Local Oscillator Input 2. Drive LOSEL high to select LO2.
Differential IF Input/Outputs
Exposed Ground Paddle. Solder the exposed paddle to the ground plane using multiple vias.
Detailed Description
The MAX2029 can operate either as a downconverter
or an upconverter mixer. As a downconverter, the
MAX2029 yields a 6.5dB conversion loss, a 6.7dB noise
figure, and a +36.5dBm third-order input intercept point
(IIP3). The integrated baluns and matching circuitry
allow for 50 Ω single-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 53dB 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 MAX2029 ’s 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 MAX2029 is specified to oper-
ate over an 815MHz to 1000MHz RF frequency range, a
570MHz to 900MHz 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 MAX2029 is optimized for low-side LO injection archi-
tectures. However, the device can operate in high-side
LO injection applications with an extended LO range, but
performance degrades as f LO increases. See the Typical
Operating Characteristics for measurements taken with
cdmaOne is a trademark of CDMA Development Group.
f LO up to 1000MHz. For a pin-compatible device that has
been optimized for high-side LO injection, refer to the
MAX2031 data sheet.
RF Port and Balun
For using the MAX2029 as a downconverter, the RF
input is internally matched to 50 Ω , 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 better than 15dB over the entire 815MHz to
1000MHz RF frequency range. For upconverter opera-
tion, the RF port is a single-ended output similarly
matched to 50 Ω .
LO Inputs, Buffer, and Balun
The MAX2029 is optimized for low-side LO injection
architectures with a 570MHz to 900MHz LO frequency
range. For a device with a 960MHz to 1180MHz LO fre-
quency range, refer to the MAX2031 data sheet. As an
added feature, the MAX2029 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 nearly all GSM applications. If fre-
quency hopping 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 V CC before digital logic is applied
to LOSEL (see the Absolute Maximum Ratings). LO1
12
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