MAXIM MAX2150 Technical data

General Description

The MAX2150 is a complete wideband direct upconver­sion quadrature modulator IC incorporating a 28-bit
sigma-delta fractional-N synthesizer. The device is tar­geted for applications in the 700MHz to 2300MHz fre­quency range.

The super-high-resolution sigma-delta fractional-N syn­thesizer is capable of better than 50mHz resolution
when used with a 10MHz reference. Other features:
fully differential I/Q modulation inputs, an internal LO
buffer, and a 50Ω wideband output driver amplifier.

A standard 3-wire interface is provided for synthesizer
programming and overall device configuration. An on­chip low-noise crystal oscillator amplifier is also includ­ed and can be configured as a buffer when an external
reference oscillator is used.

The device typically achieves 34dBc of carrier and side­band suppression at a -1dBm output level. The wide­band, internally matched RF output can also
be disabled while the synthesizer and 3-wire bus remain
powered up for continuous programming.

The device consumes 72mA from a single +3.0V sup­ply and is packaged in an ultra-compact 28-pin QFN
package (5mm ✕5mm) with an exposed pad.

Applications

Wireless Broadband

Satellite Uplink

LMDS

Wireless Base Station

Features

♦ Single Voltage Supply (2.7V to 3.6V)

♦ 75MHz 3dB I/Q Input Bandwidth

♦ Wideband 50Ω RF Output: 700MHz to 2300MHz

♦ Ultra-Fine Frequency Resolution: 100mHz

♦ High Reference Frequency for Fast-Switching

Applications

♦ Ultra-Low Phase Noise

♦ Low Spurious and Reference Emissions

♦ -1dBm RMS Output Power

♦ 60dB RF Muting Control

♦ 34dBc Typical Carrier Suppression

♦ 34dBc Typical Sideband Suppression

♦ Software- and Hardware-Controlled Shutdown

Modes

MAX2150

Wideband I/Q Modulator with Sigma-Delta

Fractional-N Synthesizer

________________________________________________________________

Maxim Integrated Products

1

Pin Configuration/

Functional Diagram

Ordering Information

19-2389; Rev 4; 6/08

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.

PART TEMP RANGE PIN-PACKAGE

MAX2150ETI -40°C to +85°C 28 TQFN-EP*

MAX2150ETI+ -40°C to +85°C 28 TQFN-EP*

*

EP = Exposed paddle.

+

Denotes lead-free package.

VCC_RF

I+ Q+I- Q- BUFOUTBUFEN

27

28

TXEN

1

VCC_PA

2

RFOUT

N.C.

N.C.

LOCK

VCC_SD

3

4

5

6

7

0

PROGRAMMING

AND CONTROL

9

8

CLK DATA SYNEN

26

90

∑ Δ – MOD

10

EN

25

MAX2150

11

SHDN

QFN

24

12

OSCIN VCC_XTAL

23

22

21

20

19

18

1/N

PFD

1/R

13

17

16

CHP

15

14

LO+

LO-

VCC_LO

VCC_D

VCC_A

CHP

VCC_CHP

MAX2150

Wideband I/Q Modulator with Sigma-Delta
Fractional-N Synthesizer

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

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 +6.0V

RF Signals: LO+, LO-, OSCIN ........................................+10dBm

I+ to I-, Q+ to Q-.......................................................................2V

LO+, LO-, I+, I-, Q+, Q-, BUFEN, TXEN, CLK, DATA,

EN, SYNEN, OSCIN, OSCOUT, BUFOUT, CHP,
SHDN, LOCK, V

CC

_CP to GND..............-0.3V to (V

CC

+ 0.3V)

Digital Input Current .........................................................±10mA

Short-Circuit Duration RFOUT, BUFOUT, OSCOUT,

Lock, CHP...........................................................................10s

Continuous Power Dissipation

28-Pin TQFN (T

A

= +70°C)..................................................2W

(derate 28.5mW/°C above +70°C)

Operating Temperature Range ...........................-40°C to +85°C

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

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

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

DC ELECTRICAL CHARACTERISTICS

(MAX2150 EV kit. VCC= +2.7V to +3.6V, GND = 0V, SHDN = PLLEN = TXEN = high, BUFEN= low. No AC input signals. RFOUT and
BUFOUT output ports are terminated in 50Ω. T

A

= -40°C to +85°C. Typical values are at VCC= +3V, TA= +25°C, unless otherwise

noted.) (Note 1)

CAUTION! ESD SENSITIVE DEVICE

PARAMETER CONDITIONS MIN TYP MAX UNITS

SUPPLY

Supply Voltage 2.7 3 3.6 V

TX mode, SHDN = PLLEN = TXEN = high
BUFEN = low

72 107

Supply Current

LO Buffer Supply Current Additional current in all modes for BUFEN = high 3.3 5.5 mA

Shutdown Supply Current

CONTROL INPUT/OUTPUTS (SHDN, TXEN, SYNEN, BUFEN)

Input Logic High 2V

Input Logic Low 0.5 V

Input Logic High Current 1µA

Input Logic Low Current -1 µA

Lock Detect High (Locked) 2 V

Lock D etect Low ( U nl ocked ) 0.5 V

Power-Up Time MOD mode 25 µs

Power-Down Time MOD mode 1 µs

3-WIRE CONTROL INPUT (CLK, DATA, EN)

Input Logic High

Input Logic Low 0.5 V

Input Logic High Current 1µA

Input Logic Low Current -1 µA

SYNTH mode, SHDN = PLLEN = high, TXEN =
BUFEN = low

MOD mode, SHDN = TXEN = high, SYNEN =
BUFEN = low

HW_SHDN mode, SHDN = low 0.3 600
SW_SHDN mode, PWDN bit at logic low 35 600

V

CC

0.5

25 38

46 69

-

mA

µA

V

MAX2150

Wideband I/Q Modulator with Sigma-Delta

Fractional-N Synthesizer

_______________________________________________________________________________________ 3

AC ELECTRICAL CHARACTERISTICS

(MAX2150 EV kit. VCC= +2.7V to +3.6V, SHDN = PLLEN = TXEN = high, BUFEN =low. Input I/Q signals: F

I/Q

= 500kHz, V

I/Q

= 1V

P-P

.
I+, Q+ single-ended input, driven from AC-coupled source. I-, Q- single-ended inputs are AC-coupled to GND. RFOUT and BUFOUT
output ports are terminated in 50Ω loads. f

LO

=1750MHz, PLO= -10dBm, typical values are at VCC= +3V, TA= +25°C, unless other-

wise noted.) (Note 1)

MODULATION INPUT

I/Q Input Bandwidth

I/Q Differential Input Level

I/Q DC Input Resistance 200 kΩ

I/Q Common-Mode Input Range (Note 2) 1.5 1.6 1.7 V

RF OUTPUT

Frequency Range 700 2300 MHz

Output Power

Output 1dB Compression Point 1 dBm

Output IP3 14 dBm

Carrier Suppression fRF = 1750MHz 34 dBc

Sideband Suppression fLO - f

RF Output Noise Floor f

Output Return Loss (Note 3) -9 dB

LO INPUT/OUTPUT

Frequency Range 700 2300 MHz

LO Input Power (Note 2) -12 -10 -7 dBm

LO Input Return Loss fLO =2000MHz -15 dB

LO Buffer Output Level BUFEN = high (Note 2) -14 -9.5 dBm

SIGMA-DELTA FRACTIONAL-N SYNTHESIZER

SYSTEM REQUIREMENTS

Frequency Range

Phase-Detector Input-Referred
Phase Noise Floor

In-Loop Spurious Emissions

MAIN DIVIDER AND PHASE DETECTOR

Minimum Fractional-N Step Size

Phase-Detector Comparison
Frequency

Maximum N Division 251

Minimum N Division 35

PARAMETER CONDITIONS MIN TYP MAX UNITS

BW (-1dB) 26

BW (-3dB) 75

Assumes a sine-wave input to achieve the RFOUT output
power specified below

TXEN = high, fRF = 1750MHz -7 -1

TXEN = low, f

(Note 2)

f

f
= CPX = 1 (Note 5)

= 1750MHz -60

RF

, fRF = 1750MHz 25 34 dBc

I/Q

> 40MHz (Note 2) -148 -143 dBm/Hz

OFFSET

700 2300 MHz

= f

COMP

= 1740.005MHz, f

LO

= 20MHz, CP0 = CP1 = CPX = 1 (Note 4) -138 dBc/Hz

REF

= f

COMP

= 20MHz, CP0 = CP1

REF

1V

-40 dBc

f

/

COMP

28

2

20 30 MHz

MHz

dBm

P-P

MAX2150

Wideband I/Q Modulator with Sigma-Delta
Fractional-N Synthesizer

4 _______________________________________________________________________________________

AC ELECTRICAL CHARACTERISTICS (continued)

(MAX2150 EV kit. VCC= +2.7V to +3.6V, SHDN = PLLEN = TXEN = high, BUFEN = low. Input I/Q signals: F

I/Q

= 500kHz, V

I/Q

= 1V

P-P

.
I+, Q+ single-ended input, driven from AC-coupled source. I-, Q- single-ended inputs are AC-coupled to GND. RFOUT and BUFOUT
output ports are terminated in 50Ω loads. f

LO

=1750MHz, PLO= -10dBm, typical values are at VCC= +3V, TA= +25°C, unless other-

wise noted.) (Note 1)

Note 1: Parameters are guaranteed by production testing at +25°C and +85°C. Minimum and maximum values over the tempera-

ture and supply voltage range are guaranteed by design and characterization.

Note 2: Guaranteed by design and characterization.
Note 3: Measured with MAX2150 EV kit.
Note 4: Measured with an on-chip crystal oscillator.
Note 5: In-loop spurious emissions occur when synthesizing a frequency at an integer multiple of the comparison frequency with

fractional offset within the PLL loop BW.

Note 6: If an on-chip oscillator is used, a fundamental tone crystal is needed.
Note 7: Minimum and maximum values at CPX = 1 are guaranteed by production testing. Values at CPX = 0 are guaranteed by

design and characterization.

REFERENCE OSCILLATOR AND DIVIDER

Input Frequency Range 10 50 MHz

AC-Coupled Input Sensitivity AC-coupled, single ended (Note 2) 0.4 2.3 V

Reference Division Ratio (Notes 2, 6) 1 4

CHARGE-PUMP OUTPUT

Charge-Pump Current (Note 7)

Charge-Pump Voltage
Compliance

PARAMETER CONDITIONS MIN TYP MAX UNITS

CP1, CP0 = 00

CP1, CP0 = 01

CP1, CP0 = 10

CP1, CP0 = 11

Sink/source currents match within ±5% 0.5

CPX = 0 0.12 0.17 0.22

CPX = 1 0.23 0.34 0.44

CPX = 0 0.23 0.35 0.46

CPX = 1 0.47 0.67 0.88

CPX = 0 0.36 0.52 0.68

CPX = 1 0.70 1.00 1.30

CPX = 0 0.48 0.69 0.90

CPX = 1 0.91 1.31 1.70

VCC -

0.5

P-P

mA

V

MAX2150

Wideband I/Q Modulator with Sigma-Delta

Fractional-N Synthesizer

_______________________________________________________________________________________

5

Typical Operating Characteristics

(MAX2150 EV kit. VCC= +3V, SHDN = PLLEN = TXEN = high, BUFEN = low. Input I/Q signals: F

I/Q

= 500kHz, V

I/Q

= 1V

P-P

. I+, Q+ sin­gle-ended input, driven from AC-coupled source. I-, Q- single-ended inputs are AC-coupled to GND. RFOUT and BUFOUT output ports
are terminated in 50Ω loads. f

LO

=1750MHz, PLO= -10dBm, TA= +25°C, unless otherwise noted.)

SUPPLY CURRENT

vs. SUPPLY VOLTAGE

100

TX MODE

80

60

40

SUPPLY CURRENT (mA)

20

0

2.7 3.6

+85°C

+25°C

-40°C

SUPPLY VOLTAGE (V)

MODULATION OUTPUT POWER

vs. FREQUENCY

4

TXEN = HIGH

2

MAX2150 toc01

0

-2
+85°C

-4

-6

-8

MODULATION OUTPUT POWER (dBm)

-10

-12

3.33.0

700 2300

-40°C

+25°C

FREQUENCY (MHz)

MAX2150 toc02

190015001100

CARRIER AND SIDEBAND

OUTPUT POWER vs. LO POWER

-1.0

-1.1

-1.2

-1.3

-1.4

-1.5

-1.6

OUTPUT POWER (dBm)

-1.7

-1.8

-1.9

-2.0
712

LO POWER (dBm)

11108 9

MAX2150 toc04

CARRIER AND SIDEBAND SUPPRESSIONS (dB)

SUPPRESSIONS vs. LO POWER

38

37

36

SIDEBAND SUPPRESSION

35

34

CARRIER SUPPRESSION

33

32

712

LO POWER (dBm)

111098

MAX2150 toc05

MODULATION OUTPUT POWER

vs. FREQUENCY

-55
TXEN = LOW

-58

-61

-64

-67

MODULATION OUTPUT POWER (dBm)

-70

700 2300

-40°C

+25°C

+85°C

FREQUENCY (MHz)

MODULATOR OUTPUT POWER

vs. I/Q INPUT LEVEL

4

0

-4

-8

-12

-16

MODULATOR OUTPUT POWER (dBm)

-20

-24

-40°C

+25°C

+85°C

0

I/Q INPUT LEVEL (mV)

190015001100

140012001000800600400200

MAX2150 toc03

MAX2150 toc06