max2031etpt Maxim Integrated Products, Inc., max2031etpt Datasheet - Page 12

• Manufacturer Part Number: max2031etpt
• Description: Max2031 High-linearity, 815mhz To 1000mhz Upconversion/downconversion Mixer With Lo Buffer/switch
• Manufacturer: Maxim Integrated Products, Inc.

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 50Ω 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 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 MAX2031’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 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 f
High-Linearity, 815MHz to 1000MHz Upconversion/
Downconversion Mixer with LO Buffer/Switch
cdmaOne is a trademark of CDMA Development Group.
12
13, 16, 17, 20
4, 5, 10, 12,
1, 6, 8, 14
18, 19
______________________________________________________________________________________
PIN
EP
11
15
2
3
7
9
LOBIAS Bias Resistor for Internal LO Buffer. Connect a 523Ω ±1% resistor from LOBIAS to the power supply.
IF-, IF+ Differential IF Input/Outputs
LOSEL
NAME
GND
GND
LO1
LO2
V
TAP
RF
CC
Detailed Description
Power-Supply Connection. Bypass each V
Application Circuit.
S i ng l e- E nd ed 50Ω RF Inp ut/O utp ut. Thi s p or t i s i nter nal l y m atched and D C shor ted to G N D thr oug h a b al un.
Center Tap of the Internal RF Balun. Connect to ground.
Ground
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.
Exposed Ground Paddle. Solder the exposed paddle to the ground plane using multiple vias.
LO
decreases. See
CC
the Typical Operating Characteristics for measurements
taken with f
device that has been optimized for LO frequencies below
960MHz, contact the factory.
For using the MAX2031 as a downconverter, the RF
input is internally matched to 50Ω, 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 50Ω.
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 V
Absolute Maximum Ratings). LO1 and LO2 inputs are
internally matched to 50Ω, requiring an 82pF DC-block-
ing capacitor at each input.
pin to GND with capacitors as shown in the Typical
CC
FUNCTION
before digital logic is applied to LOSEL (see the
LO
below 960MHz. For a pin-compatible
LO Inputs, Buffer, and Balun
Pin Description
RF Port and Balun