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PDF MAX2104 Data sheet ( Hoja de datos )
| Número de pieza | MAX2104 | |
| Descripción | Direct-Conversion Tuner IC for Digital DBS Applications | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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19-1431; Rev 3; 12/01
Direct-Conversion Tuner IC for
Digital DBS Applications
General Description
The MAX2104 low-cost direct-conversion tuner IC is
designed for use in digital direct-broadcast satellite
(DBS) television set-top box units. Its direct-conversion
architecture reduces system cost compared to devices
with IF-based architectures. The MAX2104 directly con-
verts L-band signals to baseband signals using a
broadband I/Q downconverter. The operating frequency
range extends from 925MHz to 2175MHz.
The IC includes an LNA gain control, I and Q downcon-
verting mixers, lowpass filters with gain control and fre-
quency control, a local oscillator (LO) buffer with a 90°
quadrature network, and a charge-pump based PLL for
frequency control. The MAX2104 also has an on-chip
LO, requiring only an external varactor-tuned LC tank
for operation. The output of the LO drives the internal
quadrature generator and dual modulus prescaler. An
on-chip crystal amplifier drives a reference divider as
well as a buffer amplifier to drive off-chip circuitry. The
MAX2104 is offered in a 48-pin TQFP-EP package.
Applications
DirecTV, PrimeStar, EchoStar DBS Tuners
DVB-Compliant DBS Tuners
Broadband Systems
LMDS
Features
o Low-Cost Architecture
o Operates from Single 5V Supply
o 925MHz to 2175MHz Input Frequency Range
o On-Chip Quadrature Generator, Dual-Modulus
Prescaler (/32, /33)
o On-Chip Crystal Amplifier
o PLL Mixer with Gain-Controlled Charge Pump
o Input Levels: -25dBm to -65dBm per Carrier
o Over 40dB Gain Control Range
o Noise Figure = 11.5dB; IIP3 = 7dBm (at 1550MHz)
o Automatic Baseband Offset Correction
o Loopthrough Replaces External Splitter
o Crystal Output Buffer
Ordering Information
PART
TEMP RANGE
MAX2104CCM*
0°C to +70°C
*Contact factory for availability.
PIN-PACKAGE
48 TQFP-EP
Functional Diagram appears at end of data sheet.
TOP VIEW
Pin Configuration
VCC
CFLT
XTL-
XTL+
GND
VCC
RFIN-
RFIN+
GND
GND
QDC-
QDC+
1
2
3
4
5
6
7
8
9
10
11
12
MAX2104
36 PLLIN-
35 PLLIN+
34 MOD-
33 MOD+
32 GND
31 IOUT+
30 IOUT-
29 VCC
28 QOUT+
27 QOUT-
26 FDOUB
25 FLCLK
TQFP
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1 page  
Direct-Conversion Tuner IC for
Digital DBS Applications
AC ELECTRICAL CHARACTERISTICS (continued)
(VCC = 4.75V to 5.25V, VIOUT_ = VQOUT_ = 0.59VP-P, CIOUT_ = CQOUT_ = 10pF, fFLCLK = 2MHz, RIOUT_ = RQOUT_ = 10kΩ,
VFDOUB = VINSEL = VCPG1 = VCPG2 = 2.4V, VPLLIN+ = VMOD+ = 1.3V, VPLLIN- = VMOD- = 1.1V, TA = +25°C. Typical values are at
VCC = 5.0V and TA = +25°C, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
SSYYNNTTHHEESSIIZZEERR
XTLOUT Output Voltage Swing
XTLOUT Output Voltage DC
Crystal Frequency Range (Note 1)
Load = 10pF | | 10kΩ, fXTLOUT = 6MHz
0.75 1
1.5 VP-P
2V
4 7.26 MHz
MOD+, MOD- Setup Time (Note 1)
MOD+, MOD- Hold Time (Note 1)
LLOOCCAALL OOSSCCIILLLLAATTOORR
LO Tuning Range (Note 1)
tSUM
tHM
Figure 1
Figure 1
7 ns
0 ns
590 1180 MHz
LO Phase Noise (Notes 7, 12)
At 1kHz offset, fLO = 2175MHz
At 10kHz offset, fLO = 2175MHz
At 100kHz offset, fLO = 2175MHz
-55
-75 dBc/Hz
-95
RFIN_ to LO Input Isolation
(Note 10)
fRFIN_ = 2150MHz
57 dB
Note 1: Minimum and maximum values are guaranteed by design and characterization over supply voltage.
Note 2: With external 100Ω termination resistor.
Note 3: Driving differential load of 10kΩ || 15pF.
Note 4: Two signals are applied to RFIN_ at fLO - 100MHz and fLO - 199MHz. VGC2 = 1V; VGC1 is set such that the baseband out-
puts are at 590mVP-P. IM products are measured at baseband outputs but are referred to RF inputs.
Note 5: Two signals are applied to RFIN_ at 1200MHz and 2150MHz. VGC2 = 1V, VGC1 is set such that the baseband outputs are
at 590mVP-P. IM products are measured at baseband outputs but are referred to RF inputs.
Note 6: PRFIN_ = -40dBm so that front end IM contributions are minimized.
Note 7: Using L64733/L64734 demo board from LSI Logic.
Note 8: Downconverted level, in dBc, of carrier present at fLO x 2, fLO = 1180MHz, fVCO = 590MHz, VFDOUB = 2.4V.
Note 9: Downconverted level, in dBc, of carrier present at fO / 2, fLO = 2175MHz, fVCO = 1087.5MHz, VFDOUB = 2.4V.
Note 10: Leakage is dominated by board parasitics.
Note 11: VCPG1 = VCPG2 = VFDOUB = VINSEL = 0.5V, fFLCLK = 0.5MHz.
Note 12: Measured at tuned frequency with PLL locked. All phase noise measurements assume tank components have a Q > 50.
_______________________________________________________________________________________ 5
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