MAX2120CTI+-MAX2120CTI+T Fast Delivery |IC PHOENIX CO.,LIMITED

MAX2120CTI+T ,Complete, Direct-Conversion Tuner for DVB-S and Free-to-Air ApplicationsApplicationsThe device includes an LNA and an RF variable-gain♦ Differential I/Q Interfaceamplifier ..
MAX212CAG ,+3V-powered, low-power, true RS-232 tranceiver.MAX21219-0162; Rev 2; 2/94+3V-Powered, Low-Power,True RS-232 Transceiver________________
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MAX212CAG ,+3V-powered, low-power, true RS-232 tranceiver.FeaturesSUPERIOR TO BIPOLAR:The MAX212 RS-232 transceiver is intended for 3V-pow-ered EIA/TIA-232E ..
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MAX212EAG ,+3V-powered, low-power, true RS-232 tranceiver.General Description ________
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MAX522ESA ,Dual, 8-Bit, Voltage-Output Serial DAC in 8-Pin SO PackageFeaturesThe MAX522 contains two 8-bit, buffered, voltage-output' Operates from a Single +2.7V to +5 ..

MAX2120CTI+-MAX2120CTI+T
Complete, Direct-Conversion Tuner for DVB-S and Free-to-Air Applications
General Description
The MAX2120 low-cost, direct-conversion tuner IC is
designed for satellite set-top and VSAT applications.
The IC is intended for QPSK, Digital Video Broadcast
(DVB-S), DSS, and free-to-air applications.
The MAX2120 directly converts the satellite signals
from the LNB to baseband using a broadband I/Q
downconverter. The operating frequency range extends
from 925MHz to 2175MHz.
The device includes an LNA and an RF variable-gain
amplifier, I and Q downconverting mixers, and baseband
lowpass filters with programmable cutoff frequency
control and digitally controlled baseband variable-gain
amplifiers. Together, the RF and baseband variable-gain
amplifiers provide more than 80dB of gain-control range.
The IC is compatible with virtually all QPSK demodulators.
The MAX2120 includes fully monolithic VCOs, as well as
a complete frequency synthesizer. Additionally, an on-
chip crystal oscillator is provided along with a buffered
output for driving additional tuners and demodulators.
Synthesizer programming and device configuration are
accomplished with a 2-wire serial interface. The IC fea-
tures a VCO autoselect (VAS) function that automatically
selects the proper VCO. For multituner applications, the
device can be configured to have one of two 2-wire
interface addresses. A low-power standby mode is
available whereupon the signal path is shut down while
leaving the reference oscillator, digital interface, and
buffer circuits active, providing a method to reduce
power in single and multituner applications.
The MAX2120 is the most advanced DBS tuner available
today. The low noise figure eliminates the need for an
external LNA. A small number of passive components are
needed to form a complete DVB, DBS, or VSAT RF front-
end solution. The tuner is available in a very small 28-pin
thin QFN package.
Applications
DirecTV and Dish Network DBS
DVB-S
Two-Way Satellite Systems
VSATs
Free-to-Air
Features925MHz to 2175MHz Frequency RangeMonolithic VCO: No Calibration Required-75dBm to 0dBm High Dynamic Range4MHz to 40MHz Integrated Variable BW LP FiltersSingle +3.3V ±5% SupplyLow-Power Standby ModeAddress Pin for Multituner ApplicationsDifferential I/Q InterfaceI2C 2-Wire Serial InterfaceVery Small 28-Pin Thin QFN Package
Complete, Direct-Conversion Tuner for DVB-S
and Free-to-Air Applications
19-0832; Rev 2; 5/10
EVALUATION KIT
AVAILABLE
VTUNE
GNDSYN
CPOUT
VCC_SYN
XTAL
VCOBYP
SCLVCC_BBQDC-ADDRQDC+IDC-
RFIN
GC1
VCC_LO
IOUT+
QOUT-
VCC_DIG
GNDTUNE
SDA4
VCC_VCOREFOUT157
GND
IOUT-202VCC_RF1IDC+124231213
VCC_RF2
MAX2120INTERFACE LOGIC
AND CONTROL
DC OFFSET
CORRECTION
LPF BW
CONTROL
DIV2/DIV4
FREQUENCY
SYNTHESIZER
QOUT+
Pin Configuration/
Functional Diagram
Ordering Information
PARTTEMP RANGEPIN-PACKAGE
MAX2120CTI+0°C to +70°C28 Thin QFN-EP*
*EP = Exposed paddle.
+Denotes a lead(Pb)-free/RoHS-compliant package.
MAX2120
Complete, Direct-Conversion Tuner for DVB-S
and Free-to-Air Applications
ABSOLUTE MAXIMUM RATINGS
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
VCCto GND...........................................................-0.3V to +3.9V
All Other Pins to GND.................................-0.3V to (VCC+ 0.3V)
RF Input Power: RFIN.....................................................+10dBm
VCOBYP, CPOUT, REFOUT, XTAL, IOUT_, QOUT_, IDC_, and
QDC_ Short-Circuit Protection.............................................10s
Continuous Power Dissipation (TA= +70°C)
28-Pin Thin QFN (derated 34.5mW/°C above +70°C)........2.75W
Operating Temperature Range...............................0°C to +70°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +160°C
Lead Temperature (soldering, 10s).................................+300°C
Soldering Temperature (reflow).......................................+260°C
DC ELECTRICAL CHARACTERISTICS
(MAX2120 Evaluation Kit: VCC= +3.13V to +3.47V, VGC1= +0.5V (max gain), TA= 0°C to +70°C. No input signals at RF, baseband
I/Os are open circuited, and LO frequency = 2150MHz. Default register settings except BBG[3:0] = 1011. Typical values measured
at VCC= +3.3V, TA = +25°C, unless otherwise noted.) (Note 1)
PARAMETERCONDITIONSMINTYPMAXUNITS
SUPPLY
Supply Voltage 3.13 3.3 3.47 V
Receive mode, bit STBY = 0 100 160 Supply Current Standby mode, bit STBY = 1 3 mA
ADDRESS SELECT INPUT (ADDR)
Digital Input-Voltage High, VIH 2.4 V
Digital Input-Voltage Low, VIL 0.5 V
Digital Input-Current High, IIH 50 µA
Digital Input-Current Low, IIL -50 µA
ANALOG GAIN-CONTROL INPUT (GC1)
Input Voltage Range Maximum gain = 0.5V 0.5 2.7 V
Input Bias Current -50 +50 µA
VCO TUNING VOLTAGE INPUT (VTUNE)
Input Voltage Range 0.4 2.3 V
2-WIRE SERIAL INPUTS (SCL, SDA)
Clock Frequency 400 kHz
Input Logic-Level High 0.7 x
VCC V
Input Logic-Level Low 0.3 x
VCCV
Input Leakage Current Digital inputs = GND or VCC ±0.1 ±1 µA
2-WIRE SERIAL OUTPUT (SDA)
Output Logic-Level Low ISINK = 1mA 0.4 V
CAUTION! ESD SENSITIVE DEVICE
Complete, Direct-Conversion Tuner for DVB-S
and Free-to-Air Applications
AC ELECTRICAL CHARACTERISTICS
(MAX2120 Evaluation Kit: VCC= +3.13V to +3.47V, VGC1= +0.5V (max gain), TA= 0°C to +70°C. Default register settings except
BBG[3:0] = 1011. Typical values measured at VCC= +3.3V, TA = +25°C, unless otherwise noted.) (Note 1)
PARAMETERCONDITIONSMINTYPMAXUNITS
MAIN SIGNAL PATH PERFORMANCE
Input Frequency Range(Note 2)9252175MHz
RF Gain-Control Range (GC1)0.5V < VGC1 < 2.7V6573dB
Baseband Gain-Control RangeBits GC2 = 1111 to 00001315dB
In-Band Input IP3(Note 3)+2dBm
Out-of-Band Input IP3(Note 4)+15dBm
Input IP2(Note 5)+40dBm
Adjacent Channel Protection(Note 6)25dB
VGC1 is set to 0.5V (maximum RF gain) and BBG[3:0] is
adjusted to give a 1VP-P baseband output level for a
-75dBm CW input tone at 1500MHz
Noise Figure
Starting with the same BBG[3:0] setting as above, VGC1
is adjusted to back off RF gain by 10dB (Note 7)912
Minimum RF Input Return Loss925MHz < fRF < 2175MHz, in 75Ω system12dB
BASEBAND OUTPUT CHARACTERISTICS
Nominal Output Voltage SwingRLOAD = 2kΩ//10pF0.51VP-P
I/Q Amplitude ImbalanceMeasured at 500kHz; filter set to 22.27MHz±1dB
I/Q Quadrature Phase ImbalanceMeasured at 500kHz; filter set to 22.27MHz3.5Degrees
Single-Ended I/Q Output
ImpedanceReal ZO, from 1MHz to 40MHz30Ω
Output 1dB Compression VoltageDifferential3VP-P
Baseband Highpass -3dB
Frequency Corner47nF capacitors at IDC_, QDC_400Hz
BASEBAND LOWPASS FILTERS
Filter Bandwidth Range440MHz
Rejection RatioAt 2 x f-3dB39dB
Group DelayUp to 1dB bandwidth37ns
Ratio of In-Filter-Band to Out-of-
Filter-Band Noise
fINBAND = 100Hz to 22.5MHz, fOUTBAND = 87.5MHz to
112.5MHz25dB
FREQUENCY SYNTHESIZER
RF-Divider Frequency Range9252175MHz
RF-Divider Range (N)162175
Reference-Divider Frequency
Range430MHz
Reference-Divider Range (R)131
Phase-Detector Comparison
Frequency12MHz
MAX2120
Complete, Direct-Conversion Tuner for DVB-S
and Free-to-Air Applications
AC ELECTRICAL CHARACTERISTICS (continued)
(MAX2120 Evaluation Kit: VCC= +3.13V to +3.47V, VGC1= +0.5V (max gain), TA= 0°C to +70°C. Default register settings except
BBG[3:0] = 1011. Typical values measured at VCC= +3.3V, TA = +25°C, unless otherwise noted.) (Note 1)
PARAMETERCONDITIONSMINTYPMAXUNITS
VOLTAGE-CONTROLLED OSCILLATOR AND LO GENERATION
Guaranteed LO Frequency
RangeTA = 0°C to +70°C9252175MHz
fOFFSET = 10kHz-82
fOFFSET = 100kHz-102LO Phase Noise
fOFFSET = 1MHz-122
dBc/Hz
XTAL/REFERENCE OSCILLATOR INPUT AND OUTPUT BUFFER
XTAL Oscillator Frequency
RangeParallel-resonance-mode crystal (Note 8)48MHz
Input Overdrive LevelAC-coupled sine wave input0.512.0VP-P
XTAL Output-Buffer Divider
Range18
XTAL Output Voltage Swing4MHz to 30MHz, CLOAD = 10pF11.52VP-P
XTAL Output Duty Cycle50%
Note 1:Min/max values are production tested at TA= +70°C. Min/max limits at TA= 0°C and TA= +25°C are guaranteed by design
and characterization.
Note 2:Gain-control range specifications met over this band.
Note 3:In-band IIP3 test conditions: GC1 set to provide the nominal baseband output drive when mixing down a -23dBm tone at
2175MHz to 5MHz baseband (fLO= 2170MHz). Baseband gain is set to its default value (BBG[3:0] = 1011). Two tones at
-26dBm each are applied at 2174MHz and 2175MHz. The IM3 tone at 3MHz is measured at baseband, but is referred to the
RF input.
Note 4:Out-of-band IIP3 test conditions: GC1 set to provide nominal baseband output drive when mixing down a -23dBm tone at
2175MHz to 5MHz baseband (fLO= 2170MHz). Baseband gain is set to its default value (BBG[3:0] = 1011). Two tones at
-20dBm each are applied at 2070MHz and 1975MHz. The IM3 tone at 5MHz is measured at baseband, but is referred to the
RF input.
Note 5:Input IP2 test conditions: GC1 set to provide nominal baseband output drive when mixing down a -23dBm tone at 2175MHz
to 5MHz baseband (fLO= 2170MHz). Baseband gain is set to its default value (BBG[3:0] = 1011). Two tones at -20dBm
each are applied at 925MHz and 1250MHz. The IM2 tone at 5MHz is measured at baseband, but is referred to the RF input.
Note 6:Adjacent channel protection test conditions: GC1 is set to provide the nominal baseband output drive with a 2110MHz
27.5Mbaud signal at -55dBm. GC2 set for mid-scale. The test signal will be set for PR = 7/8 and SNR of -8.5dB. An adjacent
channel at ±40MHz is added at -25dBm. DVB-S BER performance of 2E-4 will be maintained for the desired signal. GC2
may be adjusted for best performance.
Note 7:Guaranteed by design and characterization at TA= +25°C.
Note 8:See Table 14 for crystal ESR requirements.
Complete, Direct-Conversion Tuner for DVB-S
and Free-to-Air Applications
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX2120 toc01
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
TA = +70°C
TA = +25°C
TA = 0°C
STANDBY MODE SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX2120 toc02
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
TA = +70°C
TA = 0°C, +25°C
SUPPLY CURRENT
vs. BASEBAND FILTER CUTOFF FREQUENCY
BASEBAND FILTER CUTOFF FREQUENCY (MHz)
SUPPLY CURRENT (mA)2832242016128
HD3 vs. OUTPUT VOLTAGE
MAX2120 toc04
VOUT (VP-P)
BASEBAND 3RD-ORDER HARMONIC (dBc)
QUADRATURE PHASE vs. LO FREQUENCY
MAX2120 toc05a
LO FREQUENCY (MHz)
QUADRATURE PHASE (
TA = +70°C
TA = +25°C
fBASEBAND = 10MHz
TA = 0°C
QUADRATURE MAGNITUDE MATCHING
vs. LO FREQUENCY
MAX2120 toc05b
LO FREQUENCY (MHz)
QUADRATURE MAGNITUDE MATCHING (dB)
TA = +70°C
TA = +25°C
fBASEBAND = 10MHz
TA = 0°C
QUADRATURE PHASE
vs. BASEBAND FREQUENCY
MAX2120 toc06a
QUADRATURE PHASE (1284
TA = +70°C
TA = +25°C
fLO = 925MHz
TA = 0°C
QUADRATURE MAGNITUDE MATCHING
vs. BASEBAND FREQUENCY
MAX2120 toc06b
QUADRATURE MAGNITUDE MATCHING (dB)1284
TA = +70°C
TA = +25°C
fLO = 925MHz
TA = 0°C
Typical Operating Characteristics
(MAX2120 Evaluation Kit: VCC= +3.3V, baseband output frequency = 5MHz; VGC1= 1.2V; TA= +25°C. Default register settings
except BBG[3:0] = 1011.)
MAX2120
Complete, Direct-Conversion Tuner for DVB-S
and Free-to-Air Applications
Typical Operating Characteristics (continued)
(MAX2120 Evaluation Kit: VCC= +3.3V, baseband output frequency = 5MHz; VGC1= 1.2V; TA= +25°C. Default register settings
except BBG[3:0] = 1011.)
BASEBAND FILTER
FREQUENCY RESPONSE
MAX2120 toc07
BASEBAND FREQUENCY (MHz)
BASEBAND OUTPUT LEVEL (dB)4020
BASEBAND FILTER HIGHPASS
FREQUENCY RESPONSE
MAX2120 toc08
BASEBAND FREQUENCY (MHz)
BASEBAND OUTPUT LEVEL (dB)
10010,000
PROGRAMMED f-3dB FREQUENCY
vs. MEASURED f-3dB FREQUENCY
MAX2120 toc09
PROGRAMMED f-3dB FREQUENCY (MHz)
MEASURED f
-3dB
FREQUENCY (MHz)2015253035510
LPF[7:0] = 12 + (f-3dB - 4MHz) / 290kHz
BASEBAND FILTER 3dB FREQUENCY
vs. TEMPERATURE
MAX2120 toc10
TEMPERATURE (°C)
BASEBAND GAIN ERROR AT f
-3dB
(dB)2030605010
NORMALIZED TO TA = +25°C
INPUT POWER vs. VGC1
MAX2120 toc11
INPUT POWER (dBm)
TA = +70°CTA = +25°C
ADJUST BBG[3:0] FOR 1VP-P
BASEBAND OUTPUT WITH
PIN = -75dBm AND VGC1 = 0.5V
NOISE FIGURE vs. FREQUENCY
MAX2120 toc12
NOISE FIGURE (dB)
TA = +70°C
TA = +25°C
ADJUST BBG[3:0] FOR 1VP-P
BASEBAND OUTPUT WITH
PIN = -75dBm AND VGC1 = 0.5V
Complete, Direct-Conversion Tuner for DVB-S
and Free-to-Air Applications
Typical Operating Characteristics (continued)
(MAX2120 Evaluation Kit: VCC= +3.3V, baseband output frequency = 5MHz; VGC1= 1.2V; TA= +25°C. Default register settings
except BBG[3:0] = 1011.)
NOISE FIGURE vs. INPUT POWER
MAX2120 toc13
INPUT POWER (dBm)
NOISE FIGURE (dB)
ADJUST BBG[3:0] FOR 1VP-P
BASEBAND OUTPUT WITH
PIN = -75dBm AND VGC1 = 0.5V
fLO = 1500MHz
OUT-OF-BAND IIP3 vs. INPUT POWER
MAX2120 toc14
INPUT POWER (dBm)
OUT-OF-BAND IIP3 (dBm)
SEE NOTE 4 ON PAGE 4 FOR CONDITIONS
IN-BAND IIP3 vs. INPUT POWER
MAX2120 toc15
INPUT POWER (dBm)
IN-BAND IIP3 (dBm)
SEE NOTE 3 ON PAGE 4 FOR CONDITIONS
IIP2 vs. INPUT POWER
MAX2120 toc16
INPUT POWER (dBm)
IIP2 (dBm)
SEE NOTE 5 ON PAGE 4 FOR CONDITIONS
INPUT RETURN LOSS vs. FREQUENCY
MAX2120 toc17
INPUT RETURN LOSS (dB)
VGC1 = 2.7V
VGC1 = 0.5V
PHASE NOISE AT 10kHz OFFSET
vs. CHANNEL FREQUENCY
MAX2120 toc18
PHASE NOISE AT 10kHz OFFSET (dBc/Hz)
-88
MAX2120
Complete, Direct-Conversion Tuner for DVB-S
and Free-to-Air Applications
Pin Description
PINNAMEFUNCTIONVCC_RF2
DC Power Supply for LNA. Connect to a +3.3V low-noise supply. Bypass to GND with a 1nF capacitor
connected as close as possible to the pin. Do not share capacitor ground vias with other ground
connections.VCC_RF1
DC Power Supply for LNA. Connect to a +3.3V low-noise supply. Bypass to GND with a 1nF capacitor
connected as close as possible to the pin. Do not share capacitor ground vias with other ground
connections.GNDGround. Connect to the board’s ground plane for proper operation.RFINWideband 75Ω RF Input. Connect to an RF source through a DC-blocking capacitor.GC1RF Gain-Control Input. High-impedance analog input, with a 0.5V to 2.7V operating range. VGC1 =
0.5V corresponds to the maximum gain setting.VCC_LO
DC Power Supply for LO Generation Circuits. Connect to a +3.3V low-noise supply. Bypass to GND
with a 1nF capacitor connected as close as possible to the pin. Do not share capacitor ground vias
with other ground connections.VCC_VCO
DC Power Supply for VCO Circuits. Connect to a +3.3V low-noise supply. Bypass to GND with a 1nF
capacitor connected as close as possible to the pin. Do not share capacitor ground vias with other
ground connections.VCOBYPInternal VCO Bias Bypass. Bypass to GND with a 100nF capacitor connected as close as possible to
the pin. Do not share capacitor ground vias with other ground connections.VTUNEHigh-Impedance VCO Tune Input. Connect the PLL loop filter output directly to this pin with as short
of a connection as possible.GNDTUNEGround for VTUNE. Connect to the PCB ground plane.GNDSYNGround for Synthesizer. Connect to the PCB ground plane.Charge-Pump Output. Connect this output to the PLL loop filter input with the shortest connection
Typical Operating Characteristics (continued)
(MAX2120 Evaluation Kit: VCC= +3.3V, baseband output frequency = 5MHz; VGC1= 1.2V; TA= +25°C. Default register settings
except BBG[3:0] = 1011.)
PHASE NOISE vs. OFFSET FREQUENCY
MAX2120 toc19
OFFSET FREQUENCY (kHz)
PHASE NOISE (dBc/Hz)
fLO = 1800MHz
LO LEAKAGE vs. LO FREQUENCY
MAX2120 toc20
LO FREQUENCY (MHz)
LO LEAKAGE (dBm)
MEASURED AT RF INPUT
Complete, Direct-Conversion Tuner for DVB-S
and Free-to-Air Applications
Pin Description (continued)
PINNAMEFUNCTIONVCC_SYN
DC Power Supply for Synthesizer Circuits. Connect to a +3.3V low-noise supply. Bypass to GND with
a 1nF capacitor connected as close as possible to the pin. Do not share capacitor ground vias with
other ground connections.XTALCrystal-Oscillator Interface. Use with an external parallel-resonance-mode crystal by a series 1nF
capacitor. See the Typical Operating Circuit.REFOUTCrystal-Oscillator Buffer Output. A DC-blocking capacitor must be used when driving external
circuitry.VCC_DIG
DC Power Supply for Digital Logic Circuits. Connect to a +3.3V low-noise supply. Bypass to GND
with a 1nF capacitor connected as close to the pin as possible. Do not share capacitor ground vias
with other ground connections.QOUT+QOUT-Quadrature Baseband Differential Output. AC-couple with a 47nF capacitor to the demodulator input.IOUT+IOUT-In-Phase Baseband Differential Output. AC-couple with a 47nF capacitor to the demodulator input.IDC+IDC-
I-Channel baseband DC Offset Correction. Connect a 47nF ceramic chip capacitor from IDC- to
IDC+.QDC+QDC-
Q-Channel Baseband DC Offset Correction. Connect a 47nF ceramic chip capacitor from QDC- to
QDC+.VCC_BB
DC Power Supply for Baseband Circuits. Connect to a +3.3V low-noise supply. Bypass to GND with a
1nF capacitor connected as close as possible to the pin. Do not share capacitor ground vias with
other ground connections.SDA2-Wire Serial Data Interface. Requires a > 1kΩ pullup resistor to VCC.SCL2-Wire Serial Clock Interface. Requires a > 1kΩ pullup resistor to VCC.ADDRAddress. ADDR is at logic-high if unconnected.
—EPExposed Paddle. Solder evenly to the board’s ground plane for proper operation.
MAX2120
Complete, Direct-Conversion Tuner for DVB-S
and Free-to-Air Applications
MSBLSB
DATA BYTEREG
REGISTER
NAME
READ/
WRITE
REG
ADDRESS
D[7]D[6]D[5]D[4]D[3]D[2]D[1]D[0] N-Divider
MSBWrite0x00XN[14]N[13]N[12]N[11]N[10]N[9]N[8] N-Divider
LSBWrite0x01N[7]N[6]N[5]N[4]N[3]N[2]N[1]N[0]Charge
PumpWrite0x02CPMP[1]
CPMP[0]
CPLIN[1]
CPLIN[0]XXXXNot UsedWrite0x03XXXXXXXXNot UsedWrite0x04XXXXXXXX
XTAL
Divider/
R-Divider
Write0x05XD[2]XD[1]XD[0]R[4]R[3]R[2]R[1]R[0]PLLWrite0x06D24CPSICPXXXXXVCOWrite0x07VCO[4]VCO[3]VCO[2]VCO[1]VCO[0]VASADLADELPFWrite0x08LPF[7]LPF[6]LPF[5]LPF[4]LPF[3]LPF[2]LPF[1]LPF[0]ControlWrite0x09STBYXPWDNXBBG[3]BBG[2]BBG[1]BBG[0]ShutdownWrite0x0AXPLL
DIV
VCO
RFMIX
RFVGATestWrite0x0BCPTST[2]
CPTST[1]
CPTST[0]XTURBO
MUX[2]
MUX[1]
MUX[0]Status
Byte-1Read0x0CPORVASAVASELDXXXXStatus
Byte-2Read0x0DVCOSBR[4]VCOSBR[3]VCOSBR[2]VCOSBR[1]VCOSBR[0]ADC[2]ADC[1]ADC[0]
Table 1. Register Configuration
0 = Set to “0” for factory-tested operation.
1 = Set to “1” for factory-tested operation.
X = Don’t care.
BIT NAMEBIT LOCATION (0 = LSB)DEFAULTFUNCTION7XDon’t care.
N[14:8]6–00000011Sets the most significant bits of the PLL integer-divide number (N).
Default value is N = 950 decimal. N can range from 16 to 2175.
Table 2. N-Divider MSB Register
Table 3. N-Divider LSB Register
Detailed Description
Register Description
The MAX2120 includes 12 user-programmable registers
and 2 read-only registers. See Table 1 for register con-
figurations. The register configuration of Table 1 shows
each bit name and the bit usage information for all regis-
ters. Note that all registers must be written after and no
earlier than 100µs after the device is powered up.
BIT NAMEBIT LOCATION (0 = LSB)DEFAULTFUNCTIONSets the least significant bits of the PLL integer-divide number (N).
Complete, Direct-Conversion Tuner for DVB-S
and Free-to-Air Applications
BIT NAMEBIT LOCATION (0 = LSB)DEFAULTFUNCTION
CPMP[1:0]7, 600Charge-pump minimum pulse width. Users must program to 00
upon powering up the device.
CPLIN[1:0]5, 400
Controls charge-pump linearity.
00 = Typically balanced charge and sink currents.
Other values are not tested.3–0XDon’t care.
Table 4. Charge-Pump Register
BIT NAMEBIT LOCATION (0 = LSB)DEFAULTFUNCTION
XD[2:0]7, 6, 5000
Sets the crystal-divider setting.
000 = Divide by 1 (default)
001 = Divide by 2
011 = Divide by 3
100 = Divide by 4
101 through 110 = All divide values from 5 (101) to 7 (110)
111 = Divide by 8
R[4:0]4–000100
Sets the PLL reference-divider (R) number.
00001 = Divide by 1
00010 = Divide by 2
00011 = Divide by 3
00100 = Divide by 4 (default)
00101 through 11110 = All divide values from 3 (00101) to 29
(11110)
11111 = Divide by 31
Table 5. XTAL Buffer and Reference Divider Register
BIT NAMEBIT LOCATION (0 = LSB)DEFAULTFUNCTION
D2471
VCO divider setting.
0 = Divide by 2. Use for LO frequencies ≥ 1125MHz.
1 = Divide by 4. Use for LO frequencies < 1125MHz.
CPS61
Charge-pump current mode.
0 = Charge-pump current controlled by ICP bit
1 = Charge-pump current controlled by VCO autoselect (VAS)
ICP50
Charge-pump current.
0 = 600µA typical
1 = 1200µA typical4–0XDon’t care.
Table 6. PLL Register

Partno	Mfg	Dc	Qty	Available	Descript
MAX2120CTI+ \|MAX2120CTI	MAXIM	N/a	195	avai	Complete, Direct-Conversion Tuner for DVB-S and Free-to-Air Applications
MAX2120CTI+T \|MAX2120CTIT	MAXIM	N/a	20000	avai	Complete, Direct-Conversion Tuner for DVB-S and Free-to-Air Applications