MAX2830ETM+ Maxim Integrated Products, MAX2830ETM+ Datasheet - Page 31

• Manufacturer Part Number: MAX2830ETM+
• Description: RF Transceiver 2.4GHz to 2.5GHz 802 .11g-b RF Transceive
• Manufacturer: Maxim Integrated Products

Specifications of MAX2830ETM+

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

are on, so that Tx or Rx modes can be quickly enabled
from this mode. Set SHDN to a logic-low and RXTX to a
logic-high to place the device in standby mode.
The complete receive signal path is enabled in this
mode. Set SHDN to logic-high and RXTX to logic-low to
place the device in Rx mode.
The complete transmitter signal path is enabled in this
mode. Set SHDN and RXTX to logic-high to place the
device in Tx mode.
The MAX2830 features Rx/Tx calibration modes to detect
I/Q imbalances and transmit LO leakage. In the Tx cali-
bration mode, all Tx circuit blocks, except the PA driver
and external PA, are powered on and active. The AM
detector and receiver I and Q channel buffers are also
on, along with multiplexers in the receiver side to route
this AM detector’s signal. In this mode, the LO leakage
calibration is done only for the LO leakage signal that is
present at the center frequency of the channel (i.e., in the
middle of the OFDM or QPSK spectrum). The LO leakage
calibration includes the effect of all DC offsets in the
entire baseband paths of the I/Q modulator and direct
leakage of the LO to the I/Q modulator output.
The LO leakage and sideband detector output are
taken at the receiver I and Q channel outputs during
this calibration phase.
During Tx LO leakage and I/Q imbalance calibration, a
sine and cosine signal (f = f
band I/Q Tx pins from the baseband IC. At the LO leak-
age and sideband-detector output, the LO leakage
corresponds to the signal at f
suppression corresponds to the signal at 2 x f
output power of these signals vary 1dB for 1dB of vari-
ation in the LO leakage and sideband suppression. To
2.4GHz to 2.5GHz 802.11g/b RF Transceiver, PA,
______________________________________________________________________________________
TONE
and Rx/Tx/Antenna Diversity Switch
Rx/Tx Calibration Mode
TONE
) is input to the base-
Transmit (Tx) Mode
Receive (Rx) Mode
and the sideband
TONE
. The
calibrate the Tx path, first set the power-detector gain
to 9dB using D12:D11 in Register 6 (see Table 22).
Adjust the DC offset of the baseband inputs to mini-
mize the signal at f
baseband input relative magnitude and phase offsets
to reduce the signal at 2 x f
In Rx calibration mode, the calibrated Tx RF signal is
internally routed to the Rx inputs. In this mode, the
VCO/LO generator/PLL blocks are powered on and
active except for the low-noise amplifier (LNA).
The MAX2830 EV kit can be used as a starting point for
layout. For best performance, take into consideration
grounding and RF, baseband, and power-supply routing.
Make connections from vias to the ground plane as short
as possible. Do not connect the device ground pin to the
exposed paddle ground. Keep the buffered clock output
trace as short as possible. Do not share the trace with the
RF input layer, especially on or interlayer or back side of
the board. On the high-impedance ports, keep traces
short to minimize shunt capacitance. EV kit Gerber files
can be requested at www.maxim-ic.com.
To minimize coupling between different sections of the
IC, a star power-supply routing configuration with a
large decoupling capacitor at a central V
recommended. The V
node, each going to a separate V
Place a bypass capacitor as close as possible to each
supply pin. This arrangement provides local decoupling
at each V
capacitor for a low-inductance ground connection. Do
not share the capacitor ground vias with any other
branch and the exposed paddle ground.
CC
pin. Use at least one via per bypass
Applications Information
TONE
CC
(LO leakage). Then, adjust the
traces branch out from this
TONE
Power-Supply Layout
.
CC
node in the circuit.
Layout Issues
CC
node is
31