MAX2102 Datasheet, PDF (1/16 Pages) Maxim Integrated Products – Direct-Conversion Tuner ICs for Digital DBS Applications

19-1256; Rev 2; 10/98
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Direct-Conversion Tuner ICs for
Digital DBS Applications
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
o Low-Cost Bipolar Design, Lowest Cost
Architecture
o Operate from a Single +5V Supply
o 950MHz to 2150MHz Input Frequency Range*
o On-Chip Quadrature Generator, Dual-Modulus
Prescaler (/64, /65)
o Input Levels
-69dBm to -19dBm per Carrier (MAX2102)
-60dBm to -19dBm per Carrier (MAX2105)
o Over 50dB AGC Control Range (MAX2102)
o Noise Figure = 13.2dB (MAX2102);
IP3 = 6.5dBm (at 1450MHz)
o Automatic Baseband Offset Correction
o Easy Interface to MAX1002/MAX1003 Dual ADC
and Popular Baseband ICs
PART
MAX2102CWI
MAX2105CWI
Ordering Information
TEMP. RANGE
0°C to +70°C
0°C to +70°C
PIN-PACKAGE
28 SO
28 SO
Functional Diagram
V_CC QOUT GND
GND
AGC
GND
RFIN
RFIN
V_CC
GND
V_CC
GND IOUT V_CC
14
13 12
11
10
9
8
7
6
5
4
3
2
1
Q
I
MAX2102
MAX2105
OFFSET CORRECTION
90°
0°
/64, /65
15 16 17 18
19
20
21
22
23
24
25
26
27 28
QDC QDC IDC IDC
GND
V_CC
LO
LO
V_CC
GND PSGND PSOUT MOD V_CC
†_{Patents pending}
*Contact factory for MAX2102/MAX2105 versions with expanded frequency range.
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