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PDF MAX2105 Data sheet ( Hoja de datos )
| Número de pieza | MAX2105 | |
| Descripción | Direct-Conversion Tuner ICs for Digital DBS Applications | |
| Fabricantes | Maxim Integrated | |
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19-1256; Rev 2; 10/98
EVFAOLLULAOTWIOSNDKAITTAMSAHNEUEATL
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
VCC QOUT GND
GND
AGC
GND
RFIN RFIN VCC
GND
VCC
GND IOUT VCC
14 13 12 11 10 9 8 7 6 5 4 3 2 1
QI
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 VCC
LO
LO VCC GND PSGND PSOUT MOD VCC
†Patents pending
*Contact factory for MAX2102/MAX2105 versions with expanded frequency range.
________________________________________________________________ Maxim Integrated Products 1
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.
1 page  
Direct-Conversion Tuner ICs for
Digital DBS Applications
AC ELECTRICAL CHARACTERISTICS (continued)
(MAX2102 EV kit circuit (Figure 1); VCC = +5V; PSGND = open; MOD = GND; fRFIN = 2150MHz; PRFIN = -19dBm; fLO =
2150.125MHz; PLO = -15dBm driven single-ended into LO; AGC set via servo loop for VIOUT = VQOUT = 0.5Vp-p; IOUT, QOUT drive
AC-coupled 100Ω loads; 2kΩ from PSOUT to GND; TA = +25°C; unless otherwise noted.)
PARAMETER
IOUT, QOUT Output Impedance
Maximum IOUT to QOUT Output
Impedance Difference
(Note 3)
(Note 3)
CONDITIONS
MIN TYP MAX UNITS
4.7 10
Ω
±1 Ω
Power-Supply Ripple Rejection
(measured at IOUT, QOUT)
VCC = 5V + 50mVp-p at 300kHz. Amplitude of
300kHz relative to 500mVp-p measured at IOUT,
QOUT. Measured using MAX2102 EV kit.
32 dB
Note 1: All specifications with guaranteed min/max limits are met within this frequency range. Contact factory for
MAX2102/MAX2105 versions with expanded frequency range.
Note 2: Guaranteed by production test and/or design and characterization.
Note 3: Guaranteed by design and characterization.
Note 4: IOUT, QOUT Phase and Amplitude Imbalance specifications are met within this LO power range.
Note 5: Tested under two conditions: 1) Normal test: PRFIN = -20dBm, and 2) Overdrive test: PRFIN = -5dBm but AGC set via servo
loop for VIOUT = VQOUT = 0.5Vp-p for PRFIN = -30dBm.
Note 6: Negative numbers (-0.1°) indicate improvement in quadrature accuracy with increasing temperature.
Note 7: Includes contribution from front-end gain tilt and delay variations produced by varying fRFIN by ±30MHz.
Note 8: 1kHz minimum frequency determined by 0.22µF offset-correction capacitors. Different value capacitors yield proportionally
different low-frequency cutoffs. Group delay at low frequencies will also be affected. See Applications Information section.
__________________________________________Typical Operating Characteristics
(MAX2102 EV kit circuit (Figure 1), VCC = 5V, PSGND = open, MOD = GND, fRFIN = 2150MHz, PRFIN = -19dBm, fLO = 2150.125MHz,
PLO = -15dBm driven single-ended into LO, AGC set via servo loop for VIOUT = VQOUT = 0.5Vp-p, IOUT, QOUT drive AC-coupled
100Ω loads, 2kΩ from PSOUT to GND, TA = +25°C, unless otherwise noted.)
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
180
PSGND = GND
170 (PRESCALER ENABLED)
TA = +70°C
160
TA = +25°C
150
MAX2102
AGC RANGE vs. FREQUENCY
0
-10 AGC = 1V
-20
-30
TA = +70°C
TA = +25°C
TA = 0°C
-40 AGC RANGE
140
TA = 0°C
-50
TA = +70°C
TA = 0°C
-60 TA = +25°C
130 AGC = 4V
-70
120 -80
4.75 4.85 5.00 5.15 5.25
0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2
SUPPLY VOLTAGE (V)
RFIN FREQUENCY (GHz)
MAX2105
AGC RANGE vs. FREQUENCY
0
-10
-20 TA = 0°C TA = +25°C TA = +70°C
-30 AGC = 1V
-40
TA = +70°C
-50 TA = +25°C
-60
AGC = 4V
-70
TA = 0°C
-80
0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2
RFIN FREQUENCY (GHz)
_______________________________________________________________________________________ 5
5 Page 
Direct-Conversion Tuner ICs for
Digital DBS Applications
The quadrature downconverter follows the front-end
AGC. Two mixers are driven by the previous stage
AGC amplifier output. The mixer LO ports are fed with
the two LO signals, which are 90° apart in phase.
These quadrature LO signals are generated on-chip
using the LO signal from the LO buffer.
The resulting I/Q baseband signals are fed through
separate I and Q channel baseband amplifiers. Robust
output stages drive IOUT and QOUT. The outputs are
capable of driving lowpass filters with 100Ω character-
istic impedance (that is, the equivalent of an AC-cou-
pled, 100Ω load). The baseband -3dB output band-
width is over 90MHz.
__________Applications Information
Front-End Tuner Circuitry
for DBS Tuners
In a typical application, the signal path ahead of the
MAX2102/MAX2105 will include a discrete LNA/buffer
and a PIN-diode attenuator. Alternatively, a dual-gate
LNB
KU BAND
75Ω CABLE
950MHz to 2150MHz
F-CONNECTOR
FOR 2nd SET-TOP BOX
F-CONNECTOR
INPUT
OR
EXTERNAL
VCO
TANK
OR
TSA5055
OR EQUIV.
AGC
RFIN
IOUT 0.1µF RS
C1
RFIN
LO
LO
0 MAX2102
90 MAX2105
DIV
OFFSET CORRECTION
QOUT
0.1µF RS
C1
IDC IDC QDC QDC PSOUT
MOD
L1 L2 L3 0.1µF
C2 C3 C4
AGC
ADC
BASEBAND LP FILTERS
L1 L2 L3
C2 C3 C4
RL
(OPTIONAL
GAIN)
0.1µF
MAX1002
MAX1003
ADC
DSP:
QPSK
DEMOD
RL
Figure 2. Typical Application
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet MAX2105.PDF ] | |
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