MAX2831

2.4GHz to 2.5GHz, 802.11g RF Transceivers with Integrated PA


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Description

The MAX2831/MAX2832 direct conversion, zero-IF, RF transceivers are designed specifically for 2.4GHz to 2.5GHz 802.11g/b WLAN applications. The MAX2831 completely integrates all circuitry required to implement the RF transceiver function, providing an RF power amplifier (PA), RF-to-baseband receive path, baseband-to-RF transmit path, VCO, frequency synthesizer, crystal oscillator, and baseband/control interface. The MAX2832 integrates the same functional blocks except for the PA. Both devices include a fast-settling sigma-delta RF synthesizer with smaller than 20Hz frequency steps and a digitally tuned crystal oscillator allowing use of a low-cost crystal. The devices also integrate on-chip DC-offset cancellation and I/Q errors and carrier leakage-detection circuits. Only an RF bandpass filter (BPF), crystal, RF switch, and a small number of passive components are needed to form a complete 802.11g/b WLAN RF front-end solution.

The MAX2831/MAX2832 completely eliminate the need for an external SAW filter by implementing on-chip monolithic filters for both the receiver and transmitter. The baseband filters are optimized to meet the IEEE® 802.11g standard and proprietary turbo modes up to 40MHz channel bandwidth. These devices are suitable for the full range of 802.11g OFDM data rates (6Mbps to 54Mbps) and 802.11b QPSK and CCK data rates (1Mbps to 11Mbps). The ICs are available in a small, 48-pin TQFN package measuring only 7mm x 7mm x 0.8mm.
MAX2831, MAX2832: Typical Operating Circuit MAX2831, MAX2832: Typical Operating Circuit Enlarge+

Key Features

  • 2.4GHz to 2.5GHz ISM Band Operation
  • IEEE 802.11g/b Compatible (54Mbps OFDM and 11Mbps CCK)
  • Complete RF Transceiver, PA, and Crystal Oscillator (MAX2831)
    • Best-in-Class Transceiver Performance
    • 62mA Receiver Current
    • 2.6dB Rx Noise Figure
    • -76dBm Rx Sensitivity (54Mbps OFDM)
    • No I/Q Calibration Required
    • 0.1dB/0.35° Rx I/Q Gain/Phase Imbalance
    • 33dB RF and 62dB Baseband Gain Control Range
    • 60dB Range Analog RSSI per RF Gain Setting
    • Fast Rx I/Q DC-Offset Settling
    • Programmable Baseband Lowpass Filter
    • 20-Bit Sigma-Delta Fractional-N PLL with < 20Hz Step Size
    • Digitally Tuned Crystal Oscillator
    • +18.5dBm Transmit Power (5.6% EVM with 54Mbps OFDM)
    • 31dB Tx Gain Control Range
    • Integrated Power Detector (MAX2831)
    • Serial or Parallel Gain-Control Interface
    • > 40dB Tx Sideband Suppression without Calibration
    • Tx/Rx I/Q Error Detection
  • Transceiver Operates from +2.7V to +3.6V
  • PA Operates from +2.7V to +4.2V (MAX2831)
  • Low-Power Shutdown Mode
  • Small 48-Pin TQFN Package (7mm x 7mm x 0.8mm)

Applications/Uses

  • General 2.4GHz ISM Radios
  • Wi-Fi, PDA, VoIP, and Cellular Handsets
  • Wireless Speakers and Headphones
Part NumberSolutionsApplicationsFrequency Range
(MHz)
Footprint
(mm x mm)
Package/PinsBudgetary
Price
See Notes
MAX2831 WLANISM2400 to 25007.0 x 7.0
See Data Sheet
$4.49 @1k
See All ISM RF Transceivers (9)

Part NumberApplicationsDuplex MethodFrequency Range
(MHz)
InputsOutputsTx OIP3 Power
(dBm)
Rx Noise Figure
(dB)
VSUPPLY
(V)
ISUPPLY
(mA)
Footprint
(mm x mm)
max
MAX2832 WLAN-802.11/bOFDM2400 to 25001 Rx1 Tx18.52.62.7 to 3.6
Rx: 62
Tx: 86
7.0 x 7.0
MAX2831 
ISM
WLAN-802.11g/b
Rx: 62
Tx: 82
See All RF Transceivers > 1GHz (12)

Part NumberSolutionsApplicationsFrequency Range
(MHz)
ISUPPLY
(mA)
Footprint
(mm x mm)
Package/Pins
MAX2832 WLAN
802.11b
802.11g
2400 to 2500
Rx: 62
Shutdown: 20uA
Tx: 86
7.0 x 7.0
TQFN/48
MAX2831 -----
TQFN/48
See All WiFi/WLAN RF Transceivers (7)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.


MAX2831EVKIT: Evaluation Kit for the MAX2831

CAD Symbols and Footprints

  • MAX2831ETM+
  • MAX2831ETM+T
  • Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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