Rainbow Electronics MAX2105 User Manual

General Description

The MAX2102/MAX2105†are low-cost direct-conver­sion tuner ICs designed for use in digital direct-broad­cast satellite (DBS) television set-top box units. The
direct-conversion architecture reduces system cost
compared to devices with IF-based architectures.

The MAX2102/MAX2105 directly tune L-band signals to
baseband using a broadband I/Q downconverter.
Operating frequency range spans from at least 950MHz
to 2150MHz.

The ICs include a low-noise amplifier (LNA) with auto­matic gain control (AGC), two downconverter mixers,
an oscillator buffer with 90° quadrature generator and
prescaler, and baseband amplifiers.

The MAX2102 features an AGC range of 50dB, allowing
input power levels as low as -69dBm. The MAX2105
has a reduced AGC range of 41dB and accepts input
power levels down to -60dBm. The reduced AGC range
of the MAX2105 allows the use of a high-gain external
LNA to achieve a lower system noise figure (NF).

________________________Applications

DBS Tuners Wireless Local Loop
DVB-Compliant DBS Tuners Broadband Systems
Cellular Base Stations LMDS

____________________________Features

♦ Low-Cost Bipolar Design, Lowest Cost

Architecture

♦ Operate from a Single +5V Supply
♦ 950MHz to 2150MHz Input Frequency Range*
♦ On-Chip Quadrature Generator, Dual-Modulus

Prescaler (/64, /65)

♦ Input Levels

-69dBm to -19dBm per Carrier (MAX2102)

-60dBm to -19dBm per Carrier (MAX2105)

♦ Over 50dB AGC Control Range (MAX2102)
♦ Noise Figure = 13.2dB (MAX2102);

IP3 = 6.5dBm (at 1450MHz)

♦ Automatic Baseband Offset Correction
♦ Easy Interface to MAX1002/MAX1003 Dual ADC

and Popular Baseband ICs

MAX2102/MAX2105

Direct-Conversion Tuner ICs for

Digital DBS Applications

________________________________________________________________

Maxim Integrated Products

1

MAX2102
MAX2105

Q

I

V

CC

QOUT GND GND AGC GND RFIN V

CC

GND V

CC

GND IOUT V

CC

OFFSET CORRECTION

/64, /65

90°

0°

RFIN

QDC

IDC IDC GND V

CC

LO V

CC

GND PSGND PSOUT MOD V

CC

LOQDC

14

1312111098 7654321

15 16 17 18 19 20 21 22

23

24 25 26 27 28

Functional Diagram

19-1256; Rev 2; 10/98

PART

MAX2102CWI

0°C to +70°C

TEMP. RANGE PIN-PACKAGE

28 SO

EVALUATION KIT MANUAL

FOLLOWS DATA SHEET

Ordering Information

†

Patents pending

*

Contact factory for MAX2102/MAX2105 versions with expanded frequency range.

For free samples & the latest literature: http://www.maxim-ic.com, or phone [phone].
For small orders, phone [phone].

MAX2105CWI

0°C to +70°C 28 SO

AGC Input Bias Current

MAX2102/MAX2105

Direct-Conversion Tuner ICs for
Digital DBS Applications

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

DC ELECTRICAL CHARACTERISTICS

(VCC= +4.75V to +5.25V; GND = 0V; PSGND = GND; AGC = 1.3V; MOD = 0.8V; P

RFIN

= OFF, fLO= 1450.125MHz; PLO= -15dBm;

IOUT, QOUT = open; T

A

= 0°C to +70°C; unless otherwise noted.)

AC ELECTRICAL CHARACTERISTICS

(MAX2102 EV kit circuit (Figure 1); VCC= +5V; PSGND = open; MOD = GND; f

RFIN

= 2150MHz; P

RFIN

= -19dBm; fLO=

2150.125MHz; P

LO

= -15dBm driven single-ended into LO; AGC set via servo loop for V

IOUT

= V

QOUT

= 0.5Vp-p; IOUT, QOUT drive

AC-coupled 100Ω loads; 2kΩ from PSOUT to GND; T

A

= +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.

VCCto GND..............................................................-0.5V to +7V

RFIN to

RFIN ..........................................................................±2V

LO to LO ................................................................................±2V

AGC, MOD, RFIN, RFIN, LO, LO to GND.....-0.5V to (V

CC

+ 0.5V)

AGC Current.....................................................................±30mA

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

IOUT or QOUT to GND Short-Circuit Duration ...................10sec

PSOUT to GND Short-Circuit Duration.................................None

IDC, IDC, QDC, QDC to GND....................-0.5V to (V

CC

+ 0.5V)

Continuous Power Dissipation (T

A

= +70°C)

SO (derate 12.5mW/°C above +70°C)..........................1.025W

Operating Temperature Range...............................0°C to +70°C

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

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

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

MAX2102

0V ≤ V

MOD

≤ V

CC

CONDITIONS

mA150 195Quiescent Supply Current

V4.75 5.25Operating Supply Voltage Range

V2.2 2.6IOUT, QOUT Common-Mode Voltage

-250 180

V0.8MOD Input Low Level
V2.0MOD Input High Level

µA-80 10MOD Input Bias Current

UNITSMIN TYP MAXPARAMETER

Refers to single-carrier power generating
V

IOUT

= V

QOUT

= 0.5Vp-p,

950MHz < f

RFIN

< 2150MHz,

950MHz < fLO< 2150MHz (Note 2)

(Note 1)

Refers to single-carrier power generating
V

IOUT

= V

QOUT

= 0.5Vp-p,

950MHz < f

RFIN

< 2150MHz,

950MHz < fLO< 2150MHz (Note 2)

CONDITIONS

dBm

RFIN Maximum Single-Carrier
Input Power

MHz950 2150RFIN Carrier Frequency Range

dBm

-69

RFIN Minimum Single-Carrier
Input Power

50

UNITSMIN TYP MAXPARAMETER

-19

MAX2102

MAX2105 -60

0.5V ≤ V

AGC

≤ 4V

dB

41

AGC Range

MAX2102
MAX2105

RF FRONT END

MAX2105

µA

-180 180

AGC Input Bias Current

SUPPLY

CONTROL INPUTS, PRESCALER

0.5V ≤ V

AGC

≤ 4V

1V ≤ V

AGC

≤ 4V

1V ≤ V

AGC

≤ 4V

MAX2102/MAX2105

Direct-Conversion Tuner ICs for

Digital DBS Applications

_______________________________________________________________________________________ 3

AC ELECTRICAL CHARACTERISTICS

(MAX2102 EV kit circuit (Figure 1); VCC= +5V; PSGND = open; MOD = GND; f

RFIN

= 2150MHz; P

RFIN

= -19dBm; fLO=

2150.125MHz; P

LO

= -15dBm driven single-ended into LO; AGC set via servo loop for V

IOUT

= V

QOUT

= 0.5Vp-p; IOUT, QOUT drive

AC-coupled 100Ω loads; 2kΩ from PSOUT to GND; T

A

= +25°C; unless otherwise noted.)

P

RFIN

= -19dBm per tone, AGC set via servo loop for

V

IOUT

= V

QOUT

= 0.5Vp-p per tone,

f1

RFIN

= 1448.1MHz, f2

RFIN

= 1449MHz,

f

LO

= 1451MHz

P

RFIN

= -19dBm per tone, AGC set via servo loop for

V

IOUT

= V

QOUT

= 0.5Vp-p per tone,

f1

RFIN

= 1200MHz, f2

RFIN

= 2150MHz,

f

LO

= 951MHz

f

RFIN

= 1441MHz,

f

LO

= 1451MHz

CONDITIONS

dBm6.5RFIN Input Third-Order Intercept

11.2

dBm15.1RFIN Input Second-Order Intercept

13.2

12.9

UNITSMIN TYP MAXPARAMETER

f

RFIN

= 950MHz to 2150MHz, 50Ω source

Defined as ∆NF/∆Gain; for AGC range,
defined as single-carrier power range
of -69dBm to -59dBm (MAX2102) or

-60dBm to -50dBm (MAX2105)

950MHz < f

RFIN

< 2150MHz, 950MHz < fLO<
2150MHz. Dominated by LO second-harmonic power
causing downconversion of unwanted channel. Test
conditions: f

LO

= 1075.5MHz, f

RFIN

= 2150MHz,

P

RFIN

= -69dBm (MAX2102) or -60dBm (MAX2105)
PLO= -15dBm, 950MHz < fLO< 2150MHz (Note 3)
PLO= -15dBm, PLO= -15dBm (differentially driven),

950MHz < f

LO

< 2150MHz (Note 3)

2.3:1

dB/dB

-0.5

Maximum Noise-Figure Variation with
AGC Gain Setting

RFIN Worst-Case VSWR across
Band

dBc-32.3

Maximum Power of Spurious
Downconversion Products

dBm

-49

-54

LO Leakage at RFIN

P

RFIN

= -69dBm

AGC = 4V,
P

RFIN

set via servo

loop for V

IOUT

=

V

QOUT

= 0.5Vp-p

MAX2102

MAX2102

dB

P

RFIN

= -60dBm MAX2105 15.7

P

RFIN

= -69dBm

f

RFIN

= 2141MHz,

f

LO

= 2151MHz

Noise Figure

MAX2105P

RFIN

= -60dBm 15.5

MAX2102

MAX2105 11.5

MAX2102

MAX2105 -0.7

MAX2102/MAX2105

Direct-Conversion Tuner ICs for
Digital DBS Applications

4 _______________________________________________________________________________________

AC ELECTRICAL CHARACTERISTICS (continued)

(MAX2102 EV kit circuit (Figure 1); VCC= +5V; PSGND = open; MOD = GND; f

RFIN

= 2150MHz; P

RFIN

= -19dBm; fLO=

2150.125MHz; P

LO

= -15dBm driven single-ended into LO; AGC set via servo loop for V

IOUT

= V

QOUT

= 0.5Vp-p; IOUT, QOUT drive

AC-coupled 100Ω loads; 2kΩ from PSOUT to GND; T

A

= +25°C; unless otherwise noted.)

2kΩ || 10pF load

TA= 0°C to +70°C
(Note 2)

(Note 1)

At -3dB attenuation

P

RFIN

= -50dBm; AGC = 4V, VCC= 5.0V

PSOUT load = 2kΩ || 5pF (Note 3)

Vp-p0.8Prescaler Output Swing at PSOUT

950MHz < f

RFIN

< 2150MHz;

950MHz < f

LO

< 2150MHz; P

RFIN

= -40dBm;

f

IOUT

, f

QOUT

= 125kHz (Note 2)

950MHz < f

RFIN

< 2150MHz;

950MHz < f

LO

< 2150MHz; P

RFIN

= -40dBm;

f

IOUT

, f

QOUT

= 125kHz (Note 2)

fLO= 950MHz to 2150MHz, 50Ω source into
MAX2102 EV kit match circuit

(Note 4)
Refers to power level driven into LO,

LO (differentially driven) (Notes 2, 4)

65 65

(Notes 2, 5)

CONDITIONS

64 64

Prescaler Divide Ratio

MHz94

Baseband Bandwidth
(at IOUT, QOUT)

Vp-p2.7IOUT, QOUT Clipping Level

%35 65Prescaler Duty Cycle at PSOUT

1kHz < (f

IOUT, fQOUT

) < 25MHz, 950MHz < f

RFIN

<

2150MHz, 950MHz < f

LO

< 2150MHz (Notes 3, 7, 8)

1kHz < (f

IOUT, fQOUT

) < 25MHz, 950MHz < f

RFIN

<

2150MHz, 950MHz < f

LO

< 2150MHz (Notes 3, 7, 8)

ns0.45

dB0.45 0.85

Baseband Gain Ripple
(at IOUT, QOUT)

Baseband Group Delay Ripple
(at IOUT, QOUT)

MHz950 2150LO Input Frequency Range

dB0.5IOUT, QOUT Amplitude Imbalance

degrees3IOUT, QOUT Phase Imbalance

1.75:1

LO Input Worst-Case VSWR over
Band

-15 -5

LO Input Power Level dBm

-15
dB28RFIN to LO Input Isolation

UNITSMIN TYP MAXPARAMETER

MOD = low
MOD = high

TA= +25°C to +70°C (Notes 2 and 6)

degrees

-0.1 0.6

Worst-Case Additional Phase
Imbalance Over Temperature

TA= +25°C to +0°C (Note 2) -0.07 1

OSCILLATOR BUFFER, QUADRATURE GENERATOR, PRESCALER

BASEBAND AC CHARACTERISTICS

MAX2102/MAX2105

Direct-Conversion Tuner ICs for

Digital DBS Applications

_______________________________________________________________________________________ 5

AC ELECTRICAL CHARACTERISTICS (continued)

(MAX2102 EV kit circuit (Figure 1); VCC= +5V; PSGND = open; MOD = GND; f

RFIN

= 2150MHz; P

RFIN

= -19dBm; fLO=

2150.125MHz; P

LO

= -15dBm driven single-ended into LO; AGC set via servo loop for V

IOUT

= V

QOUT

= 0.5Vp-p; IOUT, QOUT drive

AC-coupled 100Ω loads; 2kΩ from PSOUT to GND; T

A

= +25°C; unless otherwise noted.)

(Note 3)
(Note 3)

VCC= 5V + 50mVp-p at 300kHz. Amplitude of
300kHz relative to 500mVp-p measured at IOUT,
QOUT. Measured using MAX2102 EV kit.

CONDITIONS

Ω4.7 10IOUT, QOUT Output Impedance
Ω±1

Maximum IOUT to QOUT Output
Impedance Difference

dB32

Power-Supply Ripple Rejection
(measured at IOUT, QOUT)

UNITSMIN TYP MAXPARAMETER

Note 1: All specifications with guaranteed min/max limits are met within this frequency range. Contact factory for

MAX2102/MAX2105 versions with expanded frequency range.

Note 2: Guaranteed by production test and/or design and characterization.
Note 3: Guaranteed by design and characterization.
Note 4: IOUT, QOUT Phase and Amplitude Imbalance specifications are met within this LO power range.
Note 5: Tested under two conditions: 1) Normal test: P

RFIN

= -20dBm, and 2) Overdrive test: P

RFIN

= -5dBm but AGC set via servo

loop for V

IOUT

= V

QOUT

= 0.5Vp-p for P

RFIN

= -30dBm.

Note 6: Negative numbers (-0.1°) indicate improvement in quadrature accuracy with increasing temperature.
Note 7: Includes contribution from front-end gain tilt and delay variations produced by varying f

RFIN

by ±30MHz.

Note 8: 1kHz minimum frequency determined by 0.22µF offset-correction capacitors. Different value capacitors yield proportionally

different low-frequency cutoffs. Group delay at low frequencies will also be affected. See

Applications Information

section.

__________________________________________Typical Operating Characteristics

(MAX2102 EV kit circuit (Figure 1), VCC= 5V, PSGND = open, MOD = GND, f

RFIN

= 2150MHz, P

RFIN

= -19dBm, fLO= 2150.125MHz,

PLO= -15dBm driven single-ended into LO, AGC set via servo loop for V

IOUT

= V

QOUT

= 0.5Vp-p, IOUT, QOUT drive AC-coupled

100Ω loads, 2kΩ from PSOUT to GND, TA= +25°C, unless otherwise noted.)

120

130

140

150

160

170

180

4.75 4.85 5.00 5.15 5.25

SUPPLY CURRENT

vs. SUPPLY VOLTAGE

MAX2102/05-01

SUPPLY VOLTAGE (V)

SUPPLY CURRENT (mA)

TA = 0°C

TA = +70°C

PSGND = GND
(PRESCALER ENABLED)

TA = +25°C

-80

-60

-70

-40

-50

-30

-20

-10

0

0.8 1.2 1.41.0 1.6 1.8 2.0 2.2

MAX2102

AGC RANGE vs. FREQUENCY

MAX2102/05-02

RFIN FREQUENCY (GHz)

SINGLE-CARRIER POWER FOR 0.5Vp-p

BASEBAND LEVEL (dBm)

TA = +70°C

TA = +25°C

TA = 0°C

TA = +70°C

TA = +25°C

TA = 0°C

AGC = 4V

AGC RANGE

AGC = 1V

-80

-50

-60

-70

-40

-30

-10

-20

0

0.8 1.0 1.2 1.4 1.6

1.8

2.0 2.2

MAX2105

AGC RANGE vs. FREQUENCY

MAX2102/05-01insert

RFIN FREQUENCY (GHz)

SINGLE CARRIER POWER FOR 0.5Vp-p

BASEBAND LEVEL (dBm)

TA = 0°C

AGC = 1V

AGC = 4V

TA = 0°C

TA = +25°C

TA = +70°C

TA = +70°C

TA = +25°C