Rainbow Electronics MAX2114 User Manual

General Description

The MAX2114 low-cost, direct-conversion tuner 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 MAX2114 directly
tunes L-band signals to baseband using a broadband
I/Q downconverter. The operating frequency range
spans 925MHz to 2175MHz.

The MAX2114 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
charge-pump-based phase-locked loop (PLL) for fre­quency control. The MAX2114 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 off­chip circuitry. The MAX2114 comes in a 44-pin QFN
package with exposed paddle (EP).

Applications

Features

♦ 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 = 10.6dB; IIP3 = +10.7dBm

(at 1550MHz)

♦ Automatic Baseband Offset Correction

MAX2114

DBS Direct Downconverter

________________________________________________________________ Maxim Integrated Products 1

19-1814; Rev 0; 11/00

Functional Diagram appears at end of data sheet.

Ordering InformationPin Configuration

44 QFN-EP*

PIN-PACKAGETEMP. RANGE

0°C to +85°CMAX2114UGH

PART

PLLIN­PLLIN+
MOD­MOD+
IOUT+
IOUT­V

CC

QOUT+
QOUT­RFBAND
FLCLK

V

CC

CFLT

XTL-

XTL+

GND

V

CC

RFIN+

RFIN-

GND

QDC-

QDC+

1

2

3

4

5

6

7

8

9

10

11

1213141516171819202122

4443424140393837363534

33

32

31

30

29

28

27

26

25

24

23

IDC-

IDC+

LOBUFSEL

RFOUT

CPG1

V

CC

XTLOUT

CPG2

GC1

GC2

INSEL

CPFBGND

V

CC

TANK+

VRLO

TANK-

LODIVSEL

VCCLOBUF-/PSOUT-

LOBUF+/PSOUT+

QFN-EP

MAX2114

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 price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.

*Exposed paddle

MAX2114

DBS Direct Downconverter

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

DC ELECTRICAL CHARACTERISTICS

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

IOUT_

= C

QOUT_

= 10pF, f

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

VRLO Short-Circuit Duration.....................................................0s

Continuous Current (any pin other than V

CC

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

Continuous Power Dissipation (T

A

= +70°C)

44-Pin QFN-EP (derate 27mW/°C above +70°C)............1.8W

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

FLCLK

)

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

MAX2114

DBS Direct Downconverter

_______________________________________________________________________________________ 3

DC ELECTRICAL CHARACTERISTICS (continued)

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

IOUT_

= C

QOUT_

= 10pF, f

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, f

FCLK

= 500kHz, 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

ANALOG CONTROL INPUTS (GC1, GC2)

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

P

RFIN_

= -25dBm 44.8

P

RFIN_

= -65dBm

fLO= 950MHz

fLO= 1550MHz

fLO= 2175MHz

-26

-29

-30

P

RFIN_

= -65dBm

per tone

fLO= 950MHz

fLO= 1550MHz

fLO= 2175MHz

V

GC1

= V

GC2

= +1V (max gain)

V

GC1

= V

GC2

= +4V (min gain)

2

P

RFIN_

= -40dBm,

signals within filter bandwidth

dBV

Output-Referred 1dB Compression
Point (Note 5)

P1

dBOUT

16.1

P

RFIN_

= -25dBm per tone,

f

LO

= 951MHz

dBm

RFIN_ Input Second-Order Intercept
(Note 4)

IP2

RFIN_

10.7

8.0

11.1

P

RFIN_

= -25dBm

per tone

dBm

RFIN_ Input Third-Order Intercept
Point (Note 3)

IP3

RFIN_

-68

Single
carrier

-25
dBm

RFIN_ Input Power for 0.59Vp-p
Baseband Levels

925 2175

Inferred by quadrature gain and
phase-error test

PARAMETER SYMBOL MIN TYP MAX UNITS

10.6

f

RFIN

_

= 1550MHz,

V

GC1

= 1V, V

GC2

adjusted 0.59Vp-p
baseband level

dBNoise Figure NF

CONDITIONS

MHzRFIN_ Input Frequency Range f

RFIN_