Simplified Block Diagram
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- Receive/Transmit Mixers with 35dB Image Rejection
- Adjustable-Gain LNA
- Up to +2dBm Combined Receiver Input IP3
- 4dB Combined Receiver Noise Figure
- >35dB of Transmit Power Control Range
- PA Predriver Provides up to +2dBm
- Low Current Consumption:
- 23mA Receive
- 26mA Transmit
- 9.5mA Oscillator
- 0.5µA Shutdown Mode
- Operates from Single +2.7V to +4.8V Supply
- Cordless Phones
- Spread-Spectrum Communications
- Two-Way Paging
- Wireless Networks
- Wireless Telemetry
The receive path incorporates an adjustable-gain LNA and an image-reject downconverter with 35dB image suppression. These features yield excellent combined downconverter noise figure (4dB) and high linearity with an input third-order intercept point (IP3) of up to +2dBm.
The transmitter consists of a variable-gain IF amplifier with more than 35dB control range, an image-reject upconverter with 35dB image rejection, and a power- amplifier (PA) predriver that produces up to +2dBm (in some applications serving as the final power stage).
All devices include an on-chip local oscillator (LO), requiring only an external varactor-tuned LC tank for operation. The integrated divide-by-64/65 dual-modulus prescaler can also be set to a direct mode, in which it acts as an LO buffer amplifier. Four separate power-down inputs can be used for system power management, including a 0.5µA shutdown mode. These parts are compatible with commonly used modulation schemes such as FSK, BPSK, and QPSK, as well as frequency hopping and direct sequence spread-spectrum systems. All devices come in a 28-pin SSOP package.
For applications using direct VCO or BPSK transmit modulation, as well as receive image rejection, consult the MAX2424/MAX2426 data sheet. For receive-only devices, refer to the MAX2440/MAX2441/MAX2442 data sheet.