Maxim MAX2106UCM Datasheet

General Description

The MAX2106 low-cost, direct-conversion tuner IC is
designed for use in digital direct-broadcast satellite
(DBS) television set-top box units and is a pin-for-pin
upgrade for the MAX2104. Its direct-conversion archi­tecture reduces system cost compared to devices with
IF-based architectures. The MAX2106 directly tunes L­band signals to baseband using a broadband I/Q
downconverter. The operating frequency range spans
925MHz to 2175MHz.

The IC includes a low-noise amplifier (LNA) with gain
control, I and Q downconverting mixers, lowpass filters
with gain and frequency control, a local oscillator (LO)
buffer with a 90° quadrature network, and a charge­pump-based phase-locked loop (PLL) for frequency
control. The MAX2106 has an on-chip LO, requiring
only an external varactor-tuned LC tank for operation.
The LO’s output drives the internal quadrature genera­tor and has a buffer amplifier to drive off-chip circuitry.
The MAX2106 comes in a 48-pin thin quad flat-pack
package with exposed paddle (EP).

Applications

Advantages Over MAX2104

♦ Improved Front End Achieves 10.2dB NF at 1550MHz

♦ Higher Input IIP3: 11.5dBm at 1550MHz

♦ Reduced Spurious Downconversion Products

♦ Capable of Using an External Synthesizer

Features

♦ Drop-In Replacement for MAX2104 Designs:

Requires Only Minor Software Upgrade and
Two External Resistor Value Changes

♦ Complete Low-Cost Solution for DBS Direct

Downconversion

♦ High Level of Integration Minimizes Component

Count

♦ 1MBaud to 45MBaud Operation

♦ Selectable LO Buffer

♦ +5V Single-Supply Operation

♦ 925MHz to 2175MHz Input Frequency Range

♦ On-Chip Quadrature Generator, Dual-Modulus

Prescaler (/32, /33)

♦ On-Chip Crystal Oscillator Amplifier

♦ PLL Phase Detector with Gain-Controlled Charge

Pump

♦ Input Levels: -25dBm to -68dBm per Carrier

♦ Over 50dB Gain Control Range

♦ Noise Figure = 10.2dB; IIP3 = +11.5dBm

(at 1550MHz)

♦ Automatic Baseband Offset Correction

MAX2106

DBS Direct Downconverter

________________________________________________________________ Maxim Integrated Products 1

19-1627; Rev 2; 6/03

Functional Diagram appears at end of data sheet.

Ordering Information

Pin Configuration

*Exposed paddle.

48 TQFP-EP*

PIN-PACKAGETEMP RANGE

0°C to +85°CMAX2106UCM

PART

PLLIN­PLLIN+
MOD­MOD+
LODIVSEL
IOUT+
IOUT­V

CC

QOUT+
QOUT­RFBAND
FLCLK

V

CC

CFLT

XTL-

XTL+

GND

V

CC

RFIN-

RFIN+

GND
GND

QDC-

QDC+

1

2

3

4

5

6

7

8

9

10

11

12

1314151617181920212223

24

4847464544434241403938

37

36

35

34

33

32

31

30

29

28

27

26

25

IDC-

IDC+

LOBUFSEL

GND

RFOUT

CPG1

V

CC

XTLOUT

CPG2

GC1

GC2

INSEL

CPFBGND

V

CC

TANK+

VRLO

TANK-

GND

GND

VCCLOBUF-/TPSOUT-

LOBUF+/FPSOUT+

TQFP

MAX2106

TOP VIEW

U.S. DSS Set-Top Receivers

European DVB-Compliant
Systems

Cellular Base Stations

Wireless Local Loop

Broadband Systems

LMDS

Professional Receivers

VSAT

Microwave Links

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.

MAX2106

DBS Direct Downconverter

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

DC ELECTRICAL CHARACTERISTICS

(VCC= +4.75V to +5.25V, VFB= +2.4V, C

IOUT_

= C

QOUT_

= 10pF, ƒ

FLCLK

= 2MHz, RFIN_ = unconnected, R

IOUT_

= R

QOUT_

= 10kΩ,

V

LOBUFSEL

= 0.5V, V

R

FBAND

= V

INSEL

= V

CPG1

= V

CPG2

= +2.4V, V

PLLIN+

= V

MOD+

= +1.3V, V

PLLIN-

= V

MOD-

= +1.1V, TA= +25°C,

unless otherwise noted. Typical values are at V

CC

= +5V, 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.

VCCto GND..............................................................-0.3V to +7V

All Other Pins to GND................................-0.3V to (V

CC

+ 0.3V)

RFIN+ to RFIN-, TANK+ to TANK-,

IDC+ to IDC-, QDC+ to QDC- .........................................±2V

IOUT_, QOUT_ to GND Short-Circuit Duration .......................10s

LOBUF+/PSOUT+, LOBUF-/PSOUT- Short-Circuit Duration..10s
Continuous Current (any pin other than V

CC

or GND)........20mA

Continuous Power Dissipation (T

A

= +70°C)

48-Pin TQFP-EP (derate 27mW/°C above +70°C) ..........1.5W

Operating Temperature ..........................................0°C to +85°C

Junction Temperature......................................................+150°C

Storage Temperature Range .............................-65°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

XTLOUT Output DC Voltage 1.9 V

RFBAND Input Current -200 200 µA

1.44 1.8 2.16

mA

0.48 0.6 0.72

V

CPG1

≥ 2.4V, V

CPG2

≥ 2.4V

V

CPG1

≥ 2.4V, V

CPG2

≤ 0.5V

0.24 0.3 0.36V

CPG1

≤ 0.5V, V

CPG2

≥ 2.4V

Operating Supply Current I

CC

195 275

mA

PARAMETER SYMBOL MIN TYP MAX UNITS

Input Current I

IN

-15 10 µA

Input Voltage Low V

IL

0.5 V

Input Voltage High V

IH

2.4 V

FLCLK Input Voltage High 1.85 V

FLCLK Input Voltage Low 1.45 V

FLCLK Input Current (Note 1) -1 1 µA

Operating Supply Voltage V

CC

4.75 5.25 V

Common-Mode Input Voltage V

CMI

1.08 1.2 1.32 V

Input Voltage Low -100 mV

Input Voltage High 100 mV

Input Current (Note 1)

-5 5

µA

Common-Mode Output Voltage V

CMO

2.16 2.4 2.64 V

Output Voltage Low (Note 2) -150 mV

Output Voltage High (Note 2) 150 mV

Prescaler Ratio

Reference Divider Ratio 88

Charge-Pump Output High
Measured at FB

0.08 0.1 0.12

CONDITIONS

Referenced to V

CMI

Referenced to V

CMI

R

SOURCE

= 50kΩ, V

FLCLK

= 1.65V

Referenced to V

CMO

, LOBUFSEL ≤ 0.5V

Referenced to V

CMO

, LOBUFSEL ≤ 0.5V

V

CPG1

≤ 0.5V, V

CPG2

≤ 0.5V

(V

MOD+-VMOD-

) ≥ 200mV, LOBUFSEL ≤ 0.5V 32 32

LOBUFSEL ≥ 2.4V, LODIVSEL ≤ 0.5V

LOBUFSEL ≥ 2.4V, LODIVSEL ≥ 2.4V

(V

MOD+-VMOD-

) ≤ -200mV, LOBUFSEL ≤ 0.5V

22

11

33 33

FREQUENCY SYNTHESIZER/LO BUFFER

DIFFERENTIAL DIGITAL OUTPUTS (LOBUF+/PSOUT+, LOBUF-/PSOUT-)

DIFFERENTIAL DIGITAL INPUTS (MOD+, MOD-, PLLIN+, PLLIN-)

SLEW-RATE-LIMITED DIGITAL INPUT (f

LCLK

)

STANDARD DIGITAL INPUTS (INSEL, CPG1, CPG2, LOBUFSEL, LODIVSEL)

MAX2106

DBS Direct Downconverter

_______________________________________________________________________________________ 3

DC ELECTRICAL CHARACTERISTICS (continued)

(VCC= +4.75V to +5.25V, VFB= +2.4V, C

IOUT_

= C

QOUT_

= 10pF, ƒ

FLCLK

= 2MHz, RFIN_ = unconnected, R

IOUT_

= R

QOUT_

= 10kΩ,

V

LOBUFSEL

= 0.5V, V

R

FBAND

= V

INSEL

= V

CPG1

= V

CPG2

= +2.4V, V

PLLIN+

= V

MOD+

= +1.3V, V

PLLIN-

= V

MOD-

= +1.1V, TA= +25°C,

unless otherwise noted. Typical values are at V

CC

= +5V, unless otherwise noted.)

AC ELECTRICAL CHARACTERISTICS

(IC driven single-ended with RFIN- AC-terminated in 75Ω to GND, V

CC

= +4.75V to +5.25V, V

IOUT_

= V

QOUT_

= 0.59Vp-p,

C

IOUT_

= C

QOUT_

= 10pF, ƒ

LCLK

= 2MHz, R

IOUT_

= R

QOUT_

= 10kΩ, V

LOBUFSEL

= 0.5V, V

RFBAND

= V

INSEL

= V

CPG1

= V

CPG2

= +2.4V,

V

PLLIN+

= V

MOD+

= +1.3V, V

PLLIN-

= V

MOD-

= +1.1V, TA= +25°C, unless otherwise noted. Typical values are at VCC= +5V.)

V

CPG1

≤ 0.5V, V

CPG2

≤ 0.5V

V

CPG1

≤ 0.5V, V

CPG2

≥ 2.4V

CONDITIONS

-0.12 -0.1 -0.08

Charge-Pump Output Low
Measured at FB

-0.36 -0.3 -0.24

UNITSMIN TYP MAXSYMBOLPARAMETER

V

CPG1

≥ 2.4V, V

CPG2

≤ 0.5V

V

CPG1

≥ 2.4V, V

CPG2

≥ 2.4V

-0.72 -0.6 -0.48

mA

-2.16 -1.8 -1.44

V

GC_

= 1V to 4V -50 50I

GC_

Input Current µA

Charge-Pump Output Current
Matching Positive to Negative

%Measured at FB -5 5

Charge-Pump Output Leakage nAMeasured at FB -25 25

Offset Voltage (Note 1) mV

Differential Output Voltage
Swing

Vp-pRL= 2kΩ differential 1

Common-Mode Output Voltage
(Note 1)

V0.65 0.85

-50 50

Charge-Pump Output Current
Drive (Note 1)

µAMeasured at CP 100

f

RFIN_

RFIN_ Input Frequency Range MHz

CONDITIONS

NFNoise Figure

dB

f

RFIN

_

= 1550MHz,

V

GC1

= 1V, V

GC2

adjusted 0.59Vp-p
baseband level

10.2

UNITSMIN TYP MAXSYMBOLPARAMETER

Inferred by quadrature gain and
phase-error test

925 2175

dBm

RFIN_ Input Power for 0.59Vp-p
Baseband Levels

dBm-25

Single
carrier

-68

IP3

RFIN_

RFIN_ Input Third-Order Intercept
Point (Note 3)

dBm

P

RFIN_

= -25dBm

per tone

10.5

10.5

11.5

IP2

RFIN_

RFIN_ Input Second-Order Intercept
(Note 4)

dBm

P

RFIN_

= -25dBm per tone,

f

LO

= 951MHz

17

P1

dBOUT

Output-Referred 1dB Compression
Point (Note 5)

dBV

P

RFIN_

= -40dBm,

signals within filter bandwidth

2

ANALOG CONTROL INPUTS (GC1, GC2)

BASEBAND OUTPUTS (IOUT+, IOUT-, QOUT+, QOUT-)

V

GC1

= V

GC2

= +4V (min gain)

V

GC1

= V

GC2

= +1V (max gain)
fLO= 2175MHz
fLO= 1550MHz
fLO= 950MHz

dBm

P

RFIN_

= -65dBm

per tone

-30

-29

-26

fLO= 2175MHz
fLO= 1550MHz
fLO= 950MHz

RF FRONT END

P

RFIN_

= -65dBm

dB44.8P

RFIN_

= -25dBm