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MAX2121ETI+

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P19
General Description
The MAX2121 low-cost, direct-conversion tuner IC is
designed for satellite set-top and VSAT applications.
The device directly converts the satellite signals from
the LNB to baseband using a broadband I/Q downcon-
verter. 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 base-
band lowpass filters and digitally controlled baseband
variable-gain amplifiers. Together, the RF and base-
band variable-gain amplifiers provide more than 80dB
of gain control range.
The device includes fully monolithic VCOs, as well as a
complete fractional-N 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 inter-
face. The IC features 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 inter-
face, and buffer circuits active, providing a method to
reduce power in single and multituner applications.
The device is the most advanced broadband/VSAT
DBS tuner available. The low noise figure eliminates the
need for an external LNA. A small number of passive
components are needed to form a complete broadband
satellite tuner DVB-S2 RF front-end solution. The tuner
is available in a very small, 5mm x 5mm, 28-pin thin
QFN package.
Applications
VSATs
Features
o 925MHz to 2175MHz Frequency Range
o Monolithic VCO
Low Phase Noise: -97dBc/Hz at 10kHz
No Calibration Required
o High Dynamic Range: -75dBm to 0dBm
o Integrated LP Filters: 123.75MHz
o Single +3.3V ±5% Supply
o Low-Power Standby Mode
o Address Pin for Multituner Applications
o Differential I/Q Interface
o I
2
C 2-Wire Serial Interface
o Very Small, 5mm x 5mm, 28-Pin TQFN Package
MAX2121
Complete Direct-Conversion L-Band Tuner
TUNEVCO
GNDSYN
CPOUT
V
CC_SYN
XTAL
BYPVCO
SCL
V
CC_BB
QDC-
ADDR
QDC+
IDC-
RFIN
GC1
V
CC_LO
+
IOUT+
QOUT-
V
CC_DIG
GNDTUNE
SDA
19
17
16
3
5
18
4
6
V
CC_VCO
REFOUT
15
7
GND
IOUT-
20
2
V
CC_RF1
21
IDC+
1
26 24 23
10 12
25
11 13
22
14
27
9
28
8
V
CC_RF2
MAX2121
INTERFACE LOGIC
AND CONTROL
DC OFFSET
CORRECTION
DIV2/DIV4
EP
FREQUENCY
SYNTHESIZER
QOUT+
Functional Diagram
Ordering Information
19-5959; Rev 1; 7/12
1
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
*
EP = Exposed pad.
+
Denotes a lead(Pb)-free/RoHS-compliant package.
EVALUATION KIT
AVAILABLE
PART TEMP RANGE PIN-PACKAGE
MAX2121ETI+ -40°C to +85°C 28 TQFN-EP*
MAX2121
Complete Direct-Conversion L-Band Tuner
2
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS
(MAX2121 Evaluation Kit: V
CC_
= +3.13V to +3.47V, f
XTAL
= 27MHz, T
A
= -40°C to +85°C, V
GC1
= +0.5V (max gain), default register
settings except BBG[3:0] = 1011. No input signals at RF, baseband I/Os are open circuited. Typical values measured at V
CC
=
+3.3V, T
A
= +25°C, unless otherwise noted.) (Note 1)
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.
V
CC_
to GND .........................................................-0.3V to +3.9V
All Other Pins to GND.................................-0.3V to (V
CC
+ 0.3V)
RF Input Power: RFIN .....................................................+10dBm
BYPVCO, CPOUT, XTAL, REFOUT, IOUT_, QOUT_ , IDC_,
QDC_ to GND Short-Circuit Protection...............................10s
Continuous Power Dissipation (T
A
= +70°C)
TQFN (derate 34.5mW/°C above +70°C) ......................2.75W
Operating Temperature Range .............................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow) .......................................+260°C
PARAMETER CONDITIONS MIN TYP MAX UNITS
SUPPLY
Supply Voltage (V
CC_
) 3.13 3.3 3.47 V
Receive mode, bit STBY = 0 148 200
Supply Current
Standby mode, bit STBY = 1 3
mA
ADDRESS SELECT INPUT (ADDR)
Digital Input-Voltage High, V
IH
2.4 V
Digital Input-Voltage Low, V
IL
0.5 V
Digital Input-Current High, I
IH
50 µA
Digital Input-Current Low, I
IL
-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 (TUNEVCO)
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
V
CC
V
Input Logic-Level Low
0.3 x
V
CC
V
Input Leakage Current Digital inputs = GND or V
CC
±0.1 ±1 µA
2-WIRE SERIAL OUTPUT (SDA)
Output Logic-Level Low I
SINK
= 1mA (Note 2) 0.4 V
CAUTION! ESD SENSITIVE DEVICE
MAX2121
Complete Direct-Conversion L-Band Tuner
3
PARAMETER CONDITIONS MIN TYP MAX UNITS
MAIN SIGNAL PATH PERFORMANCE
Minimum Gain f
IN
= 2175MHz 72 78 dB
Gain Flatness 925MHz to 2175MHz (Note 2) 4 6 dB
Input Frequency Range (Note 3) 925 2175 MHz
RF Gain-Control Range (GC1) 0.5V < V
GC1
< 2.7V 65 73 dB
Baseband Gain-Control Range Bits BBG[3:0] = 1111 to 0000 11.5 13.5 dB
In-Band Input IP3 (Note 4) +2 dBm
Out-of-Band Input IP3 (Note 5) +15 dBm
Input IP2 (Note 6) +40 dBm
V
GC1
is set to 0.5V (maximum RF gain) and BBG[3:0]
is adjusted to give a 1V
P-P
baseband output level for a
-75dBm CW input tone at 1500MHz
8
Noise Figure
Starting with the same BBG[3:0] setting as above,
V
GC1
is adjusted to back off RF gain by 10dB (Note 2)
9 12
dB
Minimum RF Input Return Loss 925MHz < f
RF
< 2175MHz, in 75 system 12 dB
BASEBAND OUTPUT CHARACTERISTICS
Nominal Output Voltage Swing R
LOAD
= 200//5pF 0.5 1 V
P-P
I/Q Amplitude Imbalance Measured at 500kHz ±1 dB
I/Q Quadrature Phase Imbalance Measured at 500kHz 3.5 Degrees
Single-Ended I/Q Output
Impedance
Real Z
O
, from 1MHz to 140MHz 24
Output 1dB Compression Voltage Differential 3 V
P-P
Baseband Highpass -3dB
Frequency Corner
47nF capacitors at IDC_, QDC_ 400 Hz
BASEBAND LOWPASS FILTERS (5th-Order Butterworth with 1st-Order Group Delay Compensation)
Filter Bandwidth (-3dB) 123.75 MHz
Rejection Ratio At 247.5MHz 31 dB
Group Delay Up to 0.5dB bandwidth 1.0 ns
3dB Bandwidth Tolerance ±10 %
FREQUENCY SYNTHESIZER
RF-Divider Frequency Range 925 2175 MHz
RF-Divider Range (N) 19 251
Reference-Divider Frequency
Range
12 30 MHz
Reference-Divider Range (R) 1 1
Phase-Detector Comparison
Frequency
12 30 MHz
AC ELECTRICAL CHARACTERISTICS
(MAX2121 Evaluation Kit: V
CC
= +3.13V to +3.47V, T
A
= -40°C to +85°C, default register settings except BBG[3:0] = 1111. Typical
values measured at V
CC
= +3.3V, T
A
= +25°C, unless otherwise noted.) (Note 1)
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P19

MAX2121ETI+

Mfr. #:
Buy MAX2121ETI+
Manufacturer:
Maxim Integrated
Description:
Tuners Direct-Conversion L-Band Tuner
Lifecycle:
New from this manufacturer.
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