Rainbow Electronics MAX2105 - Manual

General Description
The MAX2102/MAX2105 † are low-cost direct-conver-
sion tuner ICs designed for use in digital direct-broad-
cast satellite (DBS) television set-top box units. The
direct-conversion architecture reduces system cost
compared to devices with IF-based architectures.
The MAX2102/MAX2105 directly tune L-band signals to
baseband using a broadband I/Q downconverter.
Operating frequency range spans from at least 950MHz
to 2150MHz.
The ICs include a low-noise amplifier (LNA) with auto-
matic gain control (AGC), two downconverter mixers,
an oscillator buffer with 90° quadrature generator and
prescaler, and baseband amplifiers.
The MAX2102 features an AGC range of 50dB, allowing
input power levels as low as -69dBm. The MAX2105
has a reduced AGC range of 41dB and accepts input
power levels down to -60dBm. The reduced AGC range
of the MAX2105 allows the use of a high-gain external
LNA to achieve a lower system noise figure (NF).
________________________Applications
DBS Tuners Wireless Local Loop
DVB-Compliant DBS Tuners Broadband Systems
Cellular Base Stations LMDS
____________________________Features
♦ Low-Cost Bipolar Design, Lowest Cost
Architecture
♦ Operate from a Single +5V Supply
♦ 950MHz to 2150MHz Input Frequency Range*
♦ On-Chip Quadrature Generator, Dual-Modulus
Prescaler (/64, /65)
♦ Input Levels
-69dBm to -19dBm per Carrier (MAX2102)
-60dBm to -19dBm per Carrier (MAX2105)
♦ Over 50dB AGC Control Range (MAX2102)
♦ Noise Figure = 13.2dB (MAX2102);
IP3 = 6.5dBm (at 1450MHz)
♦ Automatic Baseband Offset Correction
♦ Easy Interface to MAX1002/MAX1003 Dual ADC
and Popular Baseband ICs
MAX2102/MAX2105
Direct-Conversion Tuner ICs for
Digital DBS Applications
________________________________________________________________ Maxim Integrated Products 1
MAX2102
MAX2105
Q I
V CC QOUT GND GND AGC GND RFIN V CC GND V CC GND IOUT V CC
OFFSET CORRECTION
/64, /65
90°
0°
RFIN
QDC IDC IDC GND V CC LO V CC GND PSGND PSOUT MOD V CC LO QDC
14 13 12 11 10 9 8 7 6 5 4 3 2 1
15 16 17 18 19 20 21 22 23 24 25 26 27 28
Functional Diagram
19-1256; Rev 2; 10/98
PART
MAX2102 CWI 0°C to +70°C
TEMP. RANGE PIN-PACKAGE
28 SO
EVALUATION KIT MANUAL
FOLLOWS DATA SHEET
Ordering Information
†
Patents pending
* Contact factory for MAX2102/MAX2105 versions with expanded frequency range.
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
MAX2105 CWI 0°C to +70°C 28 SO