MAX2308:CDMA IF VGAs and I/Q Demodulators with VCO and Synthesizer

Complete CDMA IF Subsystem

The MAX2306/MAX2308/MAX2309 are IF receivers designed for dual-band, dual-mode, and single-mode N-CDMA and W-CDMA cellular phone systems. The signal path consists of a variable-gain amplifier (VGA) and I/Q demodulator. The devices feature guaranteed +2.7V operation, a gain control range of over 110dB, and high input IP3 (-31dBm at 35dB gain, 3.4dBm at -35dB gain). Unlike similar devices, the MAX2306 family of receivers includes dual oscillators and synthesizers to form a self-contained IF subsystem. The synthesizer's reference and RF dividers are fully programmable through a 3-wire serial bus, enabling dual-band system architectures using any common reference and IF frequency. The differential baseband outputs have enough bandwidth to suit both N-CDMA and W-CDMA systems, and offer saturated output levels of 2.7Vp-p at a low +2.75V supply voltage. Including the low-noise voltage-controlled oscillator (VCO) and synthesizer, the MAX2306 draws only 26mA from a +2.75V supply in CDMA (differential IF) mode. The MAX2306/MAX2308/MAX2309 are available in 28-pin QFN packages.

Key Features
  • Complete IF Subsystem Includes VCO and Synthesizer
  • Supports Dual-Band, Triple-Mode Operation
  • VGA with >110dB Gain Control
  • Quadrature Demodulator
  • High Output Level (2.7V)
  • Programmable Charge-Pump Current
  • Supports Any IF Frequency Between 40MHz and 300MHz
  • 3-Wire Programmable Interface
  • Low Supply Voltage (+2.7V)
MAX2306, MAX2308, MAX2309: Functional Diagram
MAX2306, MAX2308, MAX2309: Functional Diagram
Applications/Uses
  • Globalstar Dual-Mode Handsets
  • Single/Dual/Triple-Mode CDMA Handsets
  • WCDMA Handsets
  • Wireless Data Links
  • Wireless Local Loop (WLL)
DataSheet
titleDownload file
MAX2306-MAX2309 Data SheetMAX2306-MAX2309.pdf
Parametrics
Part NumberVSUPPLY
(V)
ISUPPLY
(mA)
ApplicationsBand/ Freq.
(MHz)
Footprint
(mm x mm)
Package/PinsBudgetary
Price
See Notes
MAX23062.711.4 to 25.9450MHz-Band
IS-2000
IS-95
OFDM
Single, Dual and Triple Mode CDMA Handsets
WCDMA
40 - 3005.0 x 5.0QFN/28
TQFN/28
$4.73 @1k
MAX2308Single, Dual and Triple Mode CDMA Handsets70 - 300QFN/28
TQFN/28
-
MAX2309Single, Dual and Triple Mode CDMA Handsets70 - 300QFN/28
TQFN/28
$3.92 @1k
Design kits & evaluation modules
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX2308EGINo Longer AvailableMAX2308ETI+QFN,;28 pin;26 mm²-40°C to +85°CNo
MAX2308EGI-TNo Longer AvailableMAX2308ETI+QFN;28 pin-40°C to +85°CSee data sheet
MAX2308ETINo Longer AvailableMAX2308ETI+TQFN,;28 pin;26 mm²-40°C to +85°CNo
MAX2308ETI+ActiveTQFN,;28 pin;26 mm²-40°C to +85°CLead Free
MAX2308ETI+TActiveTQFN,;28 pin;26 mm²-40°C to +85°CLead Free
MAX2308ETI-TNo Longer AvailableMAX2308ETI+TQFN;28 pin-40°C to +85°CSee data sheet
MAX2306-MAX2309.pdf MAX2309
MAX2306-MAX2309.pdf MAX2309