MAX2101CMQ Fast Delivery |IC PHOENIX CO.,LIMITED

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MAX2101CMQ
6-Bit Quadrature Digitizer
_______________General Description
The MAX2101 6-bit quadrature digitizer combines quad-
rature demodulation with analog-to-digital conversion on
a single bipolar silicon die. This unique RF-to-BitsTM
function bridges the gap between existing RF downcon-
verters and CMOS digital signal processors (DSPs).
The MAX2101’s simple receiver subsystem is designed
for digital communications systems such as those used
in DBS, TVRO, WLAN, and other applications.
The MAX2101 accepts input signals from 400MHz to
700MHz and applies adjustable gain, providing at least
40dB of dynamic range.
Each baseband is filtered by an on-chip, 5th-order
Butterworth lowpass filter, or the user can select an
external filter path. Baseband sample rate is 60Msps.
The MAX2101 is available in a commercial temperature
range, 100-pin MQFP package.
________________________Applications
Recovery of PSK and QAM Modulated RF Carriers
Direct-Broadcast Satellite (DBS) Systems
Television Receive-Only (TVRO) Systems
Cable Television (CATV) Systems
Wireless Local Area Networks (WLANs)
____________________________FeaturesADCs Provide Greater than 5.5 Effective Bits at = 60Msps, fIN= 15MHzFully Integrated Lowpass Filters with
Externally Variable Bandwidth (10MHz to 30MHz)40dB Dynamic RangeIntegrated VCO and Quadrature Generation
Network for I/Q DemodulationDivide-by-16 Prescaler for Oscillator PLLProgrammable Counter for Variable Sample RatesSignal-Detection FunctionSelectable Offset Binary or Twos-Complement
Output Data FormatAutomatic Baseband Offset Cancellation
______________Ordering Information
MAX2101
6-Bit Quadrature Digitizer
__________________________________________________Typical Application CircuitRF-to-Bits is a registered trademark of Tektronix, Inc.
MAX2101
6-Bit Quadrature Digitizer
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VCC= 4.75V to 5.25V, TA= +25°C, unless otherwise noted.)
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.
Supply Voltage Ranges (Note 1)
VCC...................................................................(-0.3V to +6.5V)
VINA.....................................................................(VCCA+ 0.3V)
VIND....................................................................(VCCD+ 0.3V)
Continuous Power Dissipation (TA= +70°C).......................1.6W
Operating Temperature Range...............................0°C to +70°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, <10sec)...........................+300°C
Note 1:The digital control inputs are diode protected; however, permanent damage may occur on unconnected units under high-
energy electrostatic fields. Keep unused units in conductive foam or shunt the terminals together. Discharge the conductive
foam to the destination socket before insertion.
MAX2101
6-Bit Quadrature Digitizer
ELECTRICAL CHARACTERISTICS (continued)
(VCC= 4.75V to 5.25V, TA= +25°C, unless otherwise noted.)
MAX2101
6-Bit Quadrature Digitizer
Note 2:Guaranteed by design.
Note 3:A warm-up of 10 seconds is required at TA= 0°C.
Note 4:Sample characterization at TA= 0°C to +70°C.
Note 5:Digital inputs include Programmable Sample Rate Control (S0–S2), Binary Enable (BINEN).
Note 6:RS= Source Resistance of signal source driving IF input (IFIN, pin 90).
RTERM= Termination Resistance for inverting IF input (IFINB, pin 91).
ELECTRICAL CHARACTERISTICS (continued)
(VCC= 4.75V to 5.25V, TA= +25°C, unless otherwise noted.)
MAX2101
6-Bit Quadrature Digitizer
Note 7:RL= 1MΩ, CL= 15pF
TIMING CHARACTERISTICS
(VGND= system ground, VCCA= VCCD= 5.0V ±5%, TA= +25°C, unless otherwise noted.) (Note 4)
__________________________________________Typical Operating Characteristics
(VCC= 5V, TA = +25°C, unless otherwise noted.)
SUPPLY CURRENT vs.
SUPPLY VOLTAGE
MAX2101-TOC 01CC (V)
(mA)
SUPPLY CURRENT vs.
TEMPERATURE
MAX2101 TOC 02
TEMPERATURE (°C)
SUPPLY CURRENT (mA)
VREF (PIN 88) VOLTAGE vs.
TEMPERATURE
MAX2101 TOC 03
TEMPERATURE (°C)
VREF (V)405060
-150m
-100m
-50m
50m
100m1015202530354045505560
DIFFERENTIAL LINEARITY vs.
ADC CODE
MAX2101 TOC 10
CODE
ADJ CODE DELTA ERROR (LSB)
MAX2101
6-Bit Quadrature Digitizer
____________________________Typical Operating Characteristics (continued)
(VCC= 5V, TA = +25°C, unless otherwise noted.)
VREF (PIN 88) VOLTAGE vs.
SUPPLY VOLTAGE
MAX2101 TOC 04
VCC (V)
VREF (V)
PWR (PINS 85, 96) VOLTAGE vs.
BASEBAND AMPLITUDE
MAX2101 TOC 07
BASEBAND AMPLITUDE (V)
PWR (V)
VPTAT (PIN 97) vs.
TEMPERATURE
MAX2101 TOC 05
TEMPERATURE (°C)
VPTAT (V)
VPTAT (PIN 97) VOLTAGE vs.
SUPPLY VOLTAGE
MAX2101 TOC 06
VCC (V)
VPTAT (V)
MAX2101
6-Bit Quadrature Digitizer
-150m
-100m
-50m
50m
100m1015202530354045505560
INTEGRAL NONLINEARITY vs.
ADC CODE
MAX2101 TOC 11
CODE
ERROR (LSB)
RF SIGNAL PATH GAIN vs.
AGC (PIN 93) VOLTAGE
MAX2101-TOC 12
VAGC (V)
GAIN (dB)
NOISE FIGURE vs.
IF INPUT POWER
MAX2101-TOC 15
IF POWER (dBm)
NF (dB) (DSB)
INPUT IP3 vs.
IF POWER
MAX2101-TOC 13
IF POWER (dBm)
IIP3 (dBm)101520253035
INPUT IP3 vs.
FILTER CUTOFF FREQUENCY
MAX2101-TOC 14
CUTOFF FREQUENCY (MHz)
IIP3 (dBm)
IFIN (PIN 90) VSWR vs.
FREQUENCY
MAX2101-TOC 16
FREQUENCY (MHz)
IFIN VSWR
____________________________Typical Operating Characteristics (continued)
(VCC= 5V, TA = +25°C, unless otherwise noted.)
MAX2101
6-Bit Quadrature Digitizer
______________________________________________________________Pin Description
Each baseband is filtered by an internal 5th-order
Butterworth lowpass filter. The on-board lowpass filters
have an externally variable bandwidth of 10MHz to
30MHz. Each baseband is then converted by a 6-bit
analog-to-digital converter (ADC). The conversion result
is stored in a register and is output using the data
clock. See Figure 2 for the relation between baseband
signal, sample and data clock, and digitized data. The
external master clock is internally divided by six and is
available at RCLK for external system functions, fre-
quency synthesizers, etc. See Figures 3 and 4 for func-
tional diagrams.
IF Input Port (IFIN, IFINB)
The MAX2101 provides a balanced IF input. The inputs
are self-biasing, so the input signals should be AC termi-
nated, depending on system requirements. To minimize
noise, the unused input should be AC terminated with
25Ω. To minimize distortion, AC terminate the unused
input with a 50Ωresistor.
VCO Resonator Tank Ports
(TNKA, TNKB) and Prescaler
The MAX2101 integrates a negative impedance oscilla-
tor with balanced inputs. Use a parallel tank network,
as shown in Figure 5. The phase-noise performance of
the oscillator near the carrier is dominated by the reso-
nant network. The resonant inductor must have a suffi-
ciently high Q and a self-resonant frequency (SRF) that
is more than twice the intended LO frequency. Be sure
to minimize parasitic elements surrounding the tank
network by using proper layout techniques. See the
Applications Informationsection.
The VCO prescaler output provides phase-lock loop
capability for controlling the VCO frequency. The
prescaler generates the VCO frequency divided by 16.
As a result, the prescaler delivers a 25MHz to
43.75MHz signal over the VCO operating frequency
range of 400MHz to 700MHz. The differential outputs
should have equivalent termination.
MAX2101
6-Bit Quadrature Digitizer
_______Pin Description (continued)
______________Detailed Description
The MAX2101 6-bit quadrature digitizer solves one of
the most challenging problems of high dynamic range
digital-receiver design by combining quadrature
demodulation and analog-to-digital (A/D) conversion in
a single device. The MAX2101’s unique RF-to-Bits
function bridges the gap between RF downconverters
and CMOS digital signal processors (DSPs). Figure 1
is a simplified connection diagram.
The MAX2101 accepts input signals from 400MHz to
700MHz and applies gain depending on the input
amplitude. The signal is then split and downconverted
to baseband by two mixers, which are driven by two
local oscillator (LO) signals in quadrature. An internal
voltage-controlled oscillator (VCO) feeds the two LOs.
MAX2101
6-Bit Quadrature Digitizer
Figure 1. Typical Connection Diagram
MAX2101
6-Bit Quadrature Digitizer
Figure 2. Baseband Signal, Sample/Data Clock, and Digitized Data Timing
Figure 3. Functional Diagram—MAX2101 RF Front-End Section
MAX2101
Filter Tuning
The MAX2101 integrates two 5th-order Butterworth low-
pass filters for anti-alias filtering of the baseband sig-
nal. One filter exists for each of the I and Q channels.
The filters’ cutoff frequency is set by driving the FTUNE
pins, pin 77 (I channel) and pin 4 (Q channel). The user
sets the I/Q channel filters independently. Figure 6
shows a typical transfer curve of a filter’s cutoff fre-
quency versus FTUNE voltage.
The MAX2101’s anti-aliasing filtering function provides
superior channel-to-channel matching compared to a
discrete implementation. The filters are realized using a
gyrator topology, which inherently has a strong temper-
ature dependency. The temperature dependency of the
filters must be compensated to achieve a consistent fil-
ter response over ambient temperature. This compen-
sation is easily summed with the user-supplied filter
tune signal, with the techniques discussed for both cur-
rent-drive and voltage-drive implementations later in
this section. Figure 7 shows a typical characteristic of
the FTUNE signal required to provide a constant filter
cutoff frequency over temperature.
6-Bit Quadrature Digitizer
Figure 4. Functional Diagram—MAX2101 ADCs and Supporting Sections

Partno	Mfg	Dc	Qty	Available	Descript
MAX2101CMQ		N/a	1	avai	6-Bit Quadrature Digitizer