Maxim MAX2721EUP, MAX2720EUP Datasheet

General Description

The MAX2720/MAX2721 are low-cost, high-performance, direct I/Q modulators designed for use in widebandCDMA and wireless local-loop (WLL) systems. Their direct-upconversion architecture reduces system cost, component count, and board space compared to devices with dual-conversion architectures.

The MAX2720/MAX2721 include an I/Q modulator, a variable gain amplifier (VGA), and a power amplifier (PA) driver. The quadrature modulator accepts differential baseband I/Q signals and directly modulates an RF carrier in the 1.7GHz to 2.1GHz range (MAX2720) or the 2.1GHz to 2.5GHz range (MAX2721). The VGA provides 35dB of output power control. The modulator’s amplitude and phase balance yield 35dBc of sideband suppression and 30dBc of carrier suppression. These devices feature an LO frequency doubler that allows the external LO source to operate at half-frequency or full-frequency when disabled.

The MAX2720/MAX2721 operate from a single +2.7V to +3.3V supply and require only 77mA (MAX2720) or 86mA (MAX2721) of supply current. An additional 20mA of supply current is saved by disabling the stand-alone PA driver. A low-power shutdown mode further reduces supply current to less than 0.1µA. The device is packaged in the small 20-pin TSSOP-EP with exposed paddle to improve RF performance.

Applications

Wireless Local Loop (WLL)

Wideband CDMA Systems

LMDS/MMDS

2.4GHz Broadband ISM Radios

DCS/PCS Base Stations

Features

♦ RF Frequency Range

1.7GHz to 2.1GHz (MAX2720)

2.1GHz to 2.5GHz (MAX2721)

♦ Integrated I/Q Modulator, LO Doubler, VGA, and

PA Driver

♦ 35dB VGA Gain Control Range

♦ 35dBc Sideband Suppression

♦ 30dBc Carrier Suppression

♦ Low Supply Current

77mA (MAX2720), 86mA (MAX2721) 20mA Reduction with PA Driver Disabled

♦ 0.1µA Supply Current in Shutdown Mode

♦ +2.7V to +3.3V Single-Supply Operation

MAX2720/MAX2721

1.7GHz to 2.5GHz, Direct I/Q Modulator with VGA and PA Driver

________________________________________________________________ Maxim Integrated Products 1

20 DRIN

19 GND

18 PC

2DROUT

1GND

MODOUT

15 V

14 Q-

I-

GND

13 Q+

12 V

11 LO

8I+

MAX2720/MAX2721

3SHDN

ENX2

0°

90°

PA DRIVER

VGA

LO DOUBLER

LO PHASE SHIFTER

10GND

BIAS

Functional Diagram

19-1606; Rev 0; 1/00

PART

MAX2720EUP

MAX2721EUP

-40°C to +85°C

TEMP. RANGE PIN-PACKAGE

20 TSSOP-EP*

Pin Configuration appears at end of data sheet.

*Exposed paddle.

Ordering Information

For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800. For small orders, phone 1-800-835-8769.

MAX2720/MAX2721

1.7GHz to 2.5GHz, Direct I/Q Modulator with VGA and PA Driver

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

DC ELECTRICAL CHARACTERISTICS

(VCC= +2.7V to +3.3V; SHDN = VCC; ENX2 = GND; VPC= 0.5V; no input AC signals applied to I+, I-, Q+, Q-, LO, DRIN. MODOUT

and DROUT = V

CC, TA

= -40°C to +85°C. Typical values are at V

CC.

= +3V, TA= +25°C, unless otherwise noted.)

AC ELECTRICAL CHARACTERISTICS

(MAX2720/MAX2721 EV Kit, VCC= +3.0V, SHDN = VCC, ENX2 = GND, VPC= 2.5V, input I/Q signals driven in quadrature, from a 1kΩ source impedance, single-ended, f

I+

= fQ+= 500kHz, VI+= VQ+= 200mVp-p, PLO= -13dBm, fLO= 950MHz (MAX2720), fLO=

1157.5MHz (MAX2721), P

DRIN

= -12dBm, f

DRIN

= 1900MHz (MAX2720), f

DRIN

= 2315MHz (MAX2721), MODOUT and DROUT ports

are matched to a 50Ω load, T

= +25°C, unless otherwise noted.) (Note 1)

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 +6V

ENX2, SHDN, PC, I+, I-, Q+, Q-, LO,

DRIN to GND........................................-0.3V to (V

+ 0.3V)

ENX2, SHDN Continuous Current.....................................±10mA

PC Continuous Current.....................................................±10mA

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

MODOUT, DROUT to GND Short-Circuit Duration .................10s

Continuous Power Dissipation (T

= +70°C)

20-Pin TSSOP-EP (derate 21.7mW/°C above +70°C) ......1.74W

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

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

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

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

MAX2721

MAX2720

0.5V < VPC< 2.5V, SHDN = GND

0.5V < VPC< 2.5V

MAX2720, DRIN = GND

MAX2721, DRIN = GND SHDN = GND

CONDITIONS

86 129

77 119

2.7 3.3

Supply Voltage

Supply Current

2.5

µA

-5 5

PC Input Bias Current

µA

-1 1

Logic Input Bias Current

0.5

Logic Input Low Voltage

59 86

Supply Current with PA Driver Disabled

67 96

µA

0.1 10

Shutdown Supply Current

2.0

Logic Input High Voltage

UNITSMIN TYP MAXPARAMETER

100kHz < fI= fQ< 2MHz

100kHz < fI+= fQ+< 2MHz

fI= fQ< BW

-1dB

fI= fQ< BW

-1dB

fI= fQ < BW

-3dB

, 0.5V < VPC< 2.5V

fI= fQ< BW

-3dB

, 0.5V < VPC< 2.5V

fI= fQ< BW

-1dB

CONDITIONS

MHz

I/Q Input -3dB Bandwidth (Note 2)

MHz

14 20

I/Q BASEBAND INPUTS

I/Q Input -1dB Bandwidth (Note 2)

Group Delay Mismatch

Group Delay Ripple

I/Q Input Capacitance

Ω

I/Q Input Resistance Mismatch

mVp-p

200 630

I/Q Differential Input Level

±0.2

I/Q Gain Imbalance

degrees

±1.0

I/Q Phase Imbalance

kΩ

1.6 2.0

I/Q Input Resistance

UNITSMIN TYP MAXPARAMETER

MAX2720/MAX2721

1.7GHz to 2.5GHz, Direct I/Q Modulator with VGA and PA Driver

_______________________________________________________________________________________ 3

AC ELECTRICAL CHARACTERISTICS (continued)

(MAX2720/MAX2721 EV Kit, VCC= +3.0V, SHDN = VCC, ENX2 = GND, VPC= 2.5V, input I/Q signals driven in quadrature, from a 1kΩ source impedance, single-ended, f

I+

= fQ+= 500kHz, VI+= VQ+= 200mVp-p, PLO= -13dBm, fLO= 950MHz (MAX2720), fLO=

1157.5MHz (MAX2721), P

DRIN

= -12dBm, f

DRIN

= 1900MHz (MAX2720), f

DRIN

= 2315MHz (MAX2721), MODOUT and DROUT ports

are matched to a 50Ω load, T

= +25°C, unless otherwise noted.) (Note 1)

VPC= 2.5V

MAX2721

ENX2 = GND

MAX2721

MAX2720

ENX2 = V

VPC= 2.5V

0.5V < VPC< 2.5V

VPC= 2.5V, I/Q terminated in 50Ω

Slope between VPC= 1V and VPC= 2V

dBm

+8 +14

MAX2721, VPC= 2.5V, ENX2 = VCCor GND, T

= +25°C (Note 3)

Output Third-Order Intercept Point (Note 4)

MAX2720

CONDITIONS

+3 +6

MAX2721

ENX2 = GND

30 40

ENX2 = V

20 25

ENX2 = GND ENX2 = V

24 31

ENX2 = GND ENX2 = V

MAX2720, 0.5V < VPC< 2.5V

+9 +14

2:1

Output VSWR

dBm/Hz

-141 -137

Out-of-Band Noise Density

26 33

MAX2720

MAX2721

VCC= +3.0V + 100mVp-p at 10kHz/300kHz

MAX2720

0.5V < VPC< 2.5V

50 45

MODOUT to LO Input Isolation

1.8:1

1.9:1

LO Input VSWR

2100 2500

MAX2720, VPC= 2.5V, ENX2 = VCCor GND, T

= +25°C (Note 3)

MHz

1700 2100

2100 2500

1050 1250

1.8:1

Frequency Range (Note 3)

dBm

+1 +5

Output 1dB Compression Point

dB/V

19 23

dBc

PC Slope

VPC= 2.5V

VPC= 0.5V

Power-Supply Ripple Rejection (Note 5)

dBm

-12.5 -8.5 -6.0

Output Power, High

MAX2720

-10.5 -5.0 -2.5

MAX2721

MHz

UNITSMIN TYP MAX

850 1050

PARAMETER

LO Frequency Range (Note 3)

1700 2100

28 35

1.6:1

MODULATOR OUTPUT

dBcCarrier Suppression

Sideband Suppression dBc

VPC= 2.5V, TA= -40°C to +85°C

±1.0 ±1.8

Output Power Variation Over Temperature

±0.8 ±1.5

MAX2720

MAX2721

MAX2720

MAX2721

dBm

-16 -10

LO Input Power (Note 3)

VPC= 0.5V, ENX2 = V

or GND

29 35

Power Control Range

28 32

MAX2720

MAX2721

LO BUFFER, LO FREQUENCY DOUBLER, QUADRATURE GENERATOR

MAX2720/MAX2721

1.7GHz to 2.5GHz, Direct I/Q Modulator with VGA and PA Driver

4 _______________________________________________________________________________________

Note 1: Min/max limits are guaranteed by design and characterization and are not production tested. Note 2: I/Q input bandwith is determined by the baseband source impedance and the I/Q input capacitance. The bandwith can be

increased by lowering the baseband source impedance.

Note 3: MODOUT output power specifications are met over this frequency range for V

= 2.5V and TA= +25°C.

Note 4 IP3 measured with two tones, f

= 500kHz and f2= 600kHz, at 100mVp-p each.

Note 5: Measured relative to desired upconverted signal level. Note 6 DROUT gain specifications are met over this frequency range at T

= +25°C.

Note 7: IP3 measured with two tones, f

= 1900MHz and f2= 1901MHz, at -18dBm each.

Note 8: IP3 measured with two tones, f

= 2315MHz and f2= 2316MHz, at -18dBm each.

CONDITIONS

MAX2720

MAX2721

MAX2720

MAX2721

UNITSMIN TYP MAXPARAMETER

MAX2720

MAX2721

MAX2720

MAX2721

TA= -40°C to +85°C

MHz

1700 2100

Frequency Range (Note 6)

dBm

+9.5 +12.5

Output 1dB Compression Point

2.6

2.4

Noise Figure

±0.3 ±0.8

2100 2500

11 13.5 15.5

Gain Variation Over Temperature

8.5 11.5 15.5

±0.4 ±0.8

MAX2721 (Note 8)

MAX2720 (Note 7)

MAX2721

Reverse Isolation

+20 +24

DROUT to LO Input Isolation

1.5:1

Input VSWR

1.5:1

Output VSWR

dBm

+22 +24

Output Third-Order Intercept Point

+8 +11

AC ELECTRICAL CHARACTERISTICS (continued)

(MAX2720/MAX2721 EV Kit, VCC= +3.0V, SHDN = VCC, ENX2 = GND, VPC= 2.5V, input I/Q signals driven in quadrature, from a 1kΩ source impedance, single-ended, f

I+

= fQ+= 500kHz, VI+= VQ+= 200mVp-p, PLO= -13dBm, fLO= 950MHz (MAX2720), fLO=

1157.5MHz (MAX2721), P

DRIN

= -12dBm, f

DRIN

= 1900MHz (MAX2720), f

DRIN

= 2315MHz (MAX2721), MODOUT and DROUT ports

are matched to a 50Ω load, T

= +25°C, unless otherwise noted.) (Note 1)

Gain (Note 6) dB

PA DRIVER

MAX2720/MAX2721

1.7GHz to 2.5GHz, Direct I/Q Modulator with VGA and PA Driver

_______________________________________________________________________________________ 5

100

2.7 2.92.8 3.0 3.1 3.2 3.3

SUPPLY CURRENT vs. SUPPLY VOLTAGE

WITH PA DRIVER ENABLED

MAX2720/21toc01

SUPPLY VOLTAGE (V)

SUPPLY CURRENT (mA)

TA = +85°C

TA = +25°C

TA = -40°C

ENX2 = GND ENX2 = V

100

2.7 2.92.8 3.0 3.1 3.2 3.3

SUPPLY CURRENT vs. SUPPLY VOLTAGE

WITH PA DRIVER DISABLED

MAX2720/21toc02

SUPPLY VOLTAGE (V)

SUPPLY CURRENT (mA)

ENX2 = GND ENX2 = V

DRIN = GND

TA = +85°C

TA = +25°C

TA = -40°C

-60

-50

-40

-30

-20

-10

1700 1800 1900 2000 2100

MODULATOR OUTPUT POWER

vs. RF FREQUENCY

MAX2720/21toc04

RF FREQUENCY (MHz)

OUTPUT POWER (dBm)

TA = +85°C

= 2.5V

= 1.5V

= 0.5V

TA = +25°C

TA = -40°C

-60

-40

-50

-20

-30

-10

-19 -13 -11-17 -15 -9 -7 -5

MAX2720/21toc05

LO POWER (dBm)

OUTPUT POWER (dBm) AND CARRIER

AND SIDEBAND SUPPRESSION (dBc)

OUTPUT POWER

CARRIER SUPPRESSION

SIDEBAND SUPPRESSION

MODULATOR PERFORMANCE

vs. LO POWER (ENX2 = GND)

-70

-50

-60

-20

-30

-40

-10

-19 -13 -11-17 -15 -9 -7 -5

MAX2720/21toc06

LO POWER (dBm)

OUTPUT POWER (dBm) AND CARRIER

AND SIDEBAND SUPPRESSION (dBc)

OUTPUT POWER

MODULATOR PERFORMANCE

vs. LO POWER (ENX2 = V

)

CARRIER SUPPRESSION

SIDEBAND SUPPRESSION

Typical Operating Characteristics

(MAX2720/MAX2721 EV Kit, VCC= +3.0V, SHDN = VCC, ENX2 = GND, VPC= 2.5V, input I/Q signals driven in quadrature, from a 1kΩ source impedance, single-ended, f

I+

= fQ+= 500kHz, VI+= VQ+= 200mVp-p, PLO= -13dBm, fLO= 950MHz (MAX2720), fLO=

1157.5MHz (MAX2721), P

DRIN

= -12dBm, f

DRIN

= 1900MHz (MAX2720), f

DRIN

= 2315MHz (MAX2721), MODOUT and DROUT ports

are matched to a 50Ω load, T

= +25°C, unless otherwise noted.) (Note 1)

MAX2720

MAX2720/MAX2721

1.7GHz to 2.5GHz, Direct I/Q Modulator with VGA and PA Driver

6 _______________________________________________________________________________________

-50

-35

-40

-45

-15

-10

-20

-30

-25

-5

0 1.50.5 1.0 2.0 2.5 3.0

MAX2720/21toc10

PC VOLTAGE (V)

OUTPUT POWER (dBm)

MODULATOR OUTPUT POWER

vs. PC VOLTAGE (ENX2 = V

)

2.1GHz

1.9GHz

1.7GHz

-70

-50

-60

-40

-10

-20

-30

0 1.50.5 1.0 2.0 2.5 3.0

MAX2720/21toc11

PC VOLTAGE (V)

CARRIER SUPPRESSION (dBc)

MODULATOR CARRIER SUPPRESSION

vs. PC VOLTAGE (ENX2 = V

)

2.1GHz

1.9GHz

1.7GHz

-50

-35

-40

-45

-15

-10

-20

-30

-25

-5

0 1.50.5 1.0 2.0 2.5 3.0

MAX2720/21toc12

PC VOLTAGE (V)

SIDEBAND SUPPRESSION (dBc)

MODULATOR SIDEBAND SUPPRESSION

vs. PC VOLTAGE (ENX2 = V

)

2.1GHz

1.7GHz

1.9GHz

Typical Operating Characteristics (continued)

(MAX2720/MAX2721 EV Kit, VCC= +3.0V, SHDN = VCC, ENX2 = GND, VPC= 2.5V, input I/Q signals driven in quadrature, from a 1kΩ source impedance, single-ended, f

I+

= fQ+= 500kHz, VI+= VQ+= 200mVp-p, PLO= -13dBm, fLO= 950MHz (MAX2720), fLO=

1157.5MHz (MAX2721), P

DRIN

= -12dBm, f

DRIN

= 1900MHz (MAX2720), f

DRIN

= 2315MHz (MAX2721), MODOUT and DROUT ports

are matched to a 50Ω load, TA= +25°C, unless otherwise noted.) (Note 1)

-40

-35

-15

-10

-20

-30

-25

-5

0 1.50.5 1.0 2.0 2.5 3.0

MAX2720/21toc08

PC VOLTAGE (V)

CARRIER SUPPRESSION (dBc)

MODULATOR CARRIER SUPPRESSION

vs. PC VOLTAGE (ENX2 = GND)

2.1GHz

1.9GHz

1.7GHz

-60

-40

-50

-20

-30

-10

0 1.0 1.50.5 2.0 2.5 3.0

MAX2720/21toc09

PC VOLTAGE (V)

SIDEBAND SUPPRESSION (dBc)

MODULATION SIDEBAND SUPPRESSION

vs. PC VOLTAGE (ENX2 = GND)

2.1GHz

1.9GHz

1.7GHz

MAX2720

-50

-35

-40

-45

-15

-10

-20

-30

-25

-5

0 1.50.5 1.0 2.0 2.5 3.0

MAX2720/21toc07

PC VOLTAGE (V)

OUTPUT POWER (dBm)

1.9GHz

1.7GHz

2.1GHz

MODULATOR OUTPUT POWER

vs. PC VOLTAGE (ENX2 = GND)

MAX2720/MAX2721

1.7GHz to 2.5GHz, Direct I/Q Modulator with VGA and PA Driver

_______________________________________________________________________________________ 7

Typical Operating Characteristics (continued)

(MAX2720/MAX2721 EV Kit, VCC= +3.0V, SHDN = VCC, ENX2 = GND, VPC= 2.5V, input I/Q signals driven in quadrature, from a 1kΩ source impedance, single-ended, f

I+

= fQ+= 500kHz, VI+= VQ+= 200mVp-p, PLO= -13dBm, fLO= 950MHz (MAX2720), fLO=

1157.5MHz (MAX2721), P

DRIN

= -12dBm, f

DRIN

= 1900MHz (MAX2720), f

DRIN

= 2315MHz (MAX2721), MODOUT and DROUT ports

are matched to a 50Ω load, TA= +25°C, unless otherwise noted.) (Note 1)

-35

-40

-15

-10

-20

-30

-25

-5

0 1.50.5 1.0 2.0 2.5 3.0

MAX2720/21toc14

PC VOLTAGE (V)

CARRIER SUPPRESSION (dBc)

MODULATOR CARRIER SUPPRESSION

vs. PC VOLTAGE (ENX2 = GND)

TA = +85°C

TA = +25°C

TA = -40°C

-55

-60

-20

-30

-40

-10

0 1.50.5 1.0 2.0 2.5 3.0

MAX2720/21toc15

PC VOLTAGE (V)

SIDEBAND SUPPRESSION (dBc)

MODULATOR SIDEBAND SUPPRESSION

vs. PC VOLTAGE (ENX2 = GND)

TA = +85°C

TA = +25°C

TA = -40°C

-45

-40

-50

-15

-20

-25

-35

-30

-5

-10

0 1.50.5 1.0 2.0 2.5 3.0

MAX2720/21toc16

PC VOLTAGE (V)

OUTPUT POWER (dBm)

MODULATOR OUTPUT POWER

vs. PC VOLTAGE (ENX2 = V

)

TA = +85°C

TA = +25°C

TA = -40°C

-40

-70

-50

-60

-20

-30

-10

0 1.50.5 1.0 2.0 2.5 3.0

MAX2720/21toc17

PC VOLTAGE (V)

CARRIER SUPRESSION (dBc)

MODULATOR CARRIER SUPPRESSION

vs. PC VOLTAGE (ENX2 = V

)

TA = +85°C

TA = +25°C

TA = -40°C

-40

-50

-60

-20

-30

-10

0 1.50.5 1.0 2.0 2.5 3.0

MAX2720/21toc18

SIDEBAND SUPRESSION (dBc)

TA = +85°C

TA = -40°C

MODULATOR SIDEBAND SUPPRESSION

vs. PC VOLTAGE (ENX2 = V

)

TA = +25°C

MAX2720

-50

-35

-40

-45

-15

-10

-20

-30

-25

-5

0 1.50.5 1.0 2.0 2.5 3.0

MAX2720/21toc13

PC VOLTAGE (V)

OUTPUT POWER (dBm)

TA = +85°C

TA = +25°C

TA = -40°C

MODULATOR OUTPUT POWER vs. PC VOLTAGE (ENX2 = GND)

MAX2720/MAX2721

1.7GHz to 2.5GHz, Direct I/Q Modulator with VGA and PA Driver

8 _______________________________________________________________________________________

-60 10 10,0001000100

MODULATOR OUTPUT POWER vs. INPUT LEVEL (T

= +25°C)

-30

-40

-50

-10

-20

MAX2720 toc20

INPUT LEVEL (mVp-p)

OUTPUT POWER (dBm)

VPC = 2.5V

VPC = 2.0V

VPC = 1.5V

VPC = 1.0V

VPC = 0.5V

-60 10 10,0001000100

MODULATOR OUTPUT POWER vs. INPUT LEVEL (T

= +85°C)

-30

-40

-50

-10

-20

MAX2720 toc21

INPUT LEVEL (mVp-p)

OUTPUT POWER (dBm)

VPC = 2.5V

VPC = 2.0V

VPC = 1.5V

VPC = 1.0V

VPC = 0.5V

-20

-15

-30

-25

-5

-10

1.00 0.5 1.5 2.0 2.5 3.0

MODULATOR OUTPUT IP3

vs. PC VOLTAGE

MAX2720/21toc22

PC VOLTAGE (V)

OUTPUT IP3 (dBm)

TA = +25°C

TA = -40°C

TA = +85°C

1.0

1.2

1.6

2.0

2.4

2.8

850 890 930 970 1010 1050

MAX2720-24

FREQUENCY (MHz)

VSWR

LO PORT VSWR

vs. LO FREQUENCY (ENX2 = GND)

1.0

1.4

1.8

2.0

2.4

2.8

1700 1780 1860 1940 2020 2100

MAX2720-25

FREQUENCY (MHz)

VSWR

LO PORT VSWR

vs. LO FREQUENCY (ENX2 = V

)

Typical Operating Characteristics (continued)

(MAX2720/MAX2721 EV Kit, VCC= +3.0V, SHDN = VCC, ENX2 = GND, VPC= 2.5V, input I/Q signals driven in quadrature, from a 1kΩ source impedance, single-ended, f

I+

= fQ+= 500kHz, VI+= VQ+= 200mVp-p, PLO= -13dBm, fLO= 950MHz (MAX2720), fLO=

1157.5MHz (MAX2721), P

DRIN

= -12dBm, f

DRIN

= 1900MHz (MAX2720), f

DRIN

= 2315MHz (MAX2721), MODOUT and DROUT ports

are matched to a 50Ω load, TA= +25°C, unless otherwise noted.) (Note 1)

MAX2720

-60 10 10,0001000100

MODULATOR OUTPUT POWER

vs. INPUT LEVEL (T

= -40°C)

-30

-40

-50

-10

-20

MAX2720 toc19

INPUT LEVEL (mVp-p)

OUTPUT POWER (dBm)

VPC = 2.5V

VPC = 2.0V

VPC = 1.5V

VPC = 1.0V

VPC = 0.5V

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