Rainbow Electronics MAX2701 User Manual

General Description

The MAX2700/MAX2701 are highly integrated direct downconversion (zero-IF) receivers designed for wideband wireless local loop (WLL) systems operating in the 1.8GHz to 2.5GHz band. The MAX2700/MAX2701s’ zero-IF architecture eliminates the need for IF downconversion stages and the use of an IF SAW filter. This reduces the overall receiver cost by reducing the component count and required board space.

The MAX2700/MAX2701 have three main blocks: lownoise amplifier (LNA), quadrature downconverter, and baseband variable gain amplifiers (VGAs). The LNA is a single-ended amplifier with selectable gain and shutdown options. It provides a high input third-order intercept point (IP3), which reduces cross-modulation and gain compression due to high-level RF interference. The quadrature downconverter section consists of two highly linear double-balanced mixers driven by an external local oscillator (LO) with a selectable LO doubler. The double-balanced mixers are optimized to provide high input IP3 and minimum added noise. The mixers’ high input second-order intercept point (IIP2) helps minimize receiver desensitization due to highlevel AM-modulated interferers.

The two baseband VGAs in each channel provide 80dB of total maximum gain and greater than 60dB of gain control. The first AGC amplifier is optimized for low noise, low power dissipation, and high linearity over the entire gain range to ensure high gain compression performance. An external lowpass filter between baseband VGAs provides the required channel selectivity at the adjacent channel. An integrated gain offset correction loop circuit provides <0.3dB amplitude mismatch between the I and Q channels.

The MAX2700/MAX2701 operate from a single +2.7V to +3.3V power supply, drawing only 165mA of supply current and 20µA in shutdown mode. Both devices are available in small 48-pin TQFP packages with exposed paddle (EP) for optimum high-frequency performance.

________________________Applications

Wireless Local Loop Wideband Direct-Sequence Spread-Spectrum

Systems Two-Way MMDS Wideband 2.4GHz ISM Radios Digital Microwave Radios

Features

♦ Input Frequency Range

1.8GHz to 2.1GHz (MAX2700)

2.1GHz to 2.5GHz (MAX2701)

♦ Cascaded Performance at 1960 MHz

3.5dB Noise Figure

-7.5dBm Input IP3 at Maximum Gain

♦ LNA with Selectable Gain and Shutdown Option ♦ High Linearity Direct I/Q Downconverter ♦ Wideband LO Quadrature Generator ♦ 3dB Baseband Channel Bandwidth of At Least

56MHz

♦ Variable Gain Baseband Amplifiers with >60dB

Control Range

♦ Baseband Gain Offset Correction Loop ♦ +2.7V to +3.3V Single-Supply Operation ♦ Small 48-pin TQFP-EP Package

MAX2700/MAX2701

1.8GHz to 2.5GHz Direct Downconversion Receivers

________________________________________________________________ Maxim Integrated Products 1

IIN2DCI2+ DCI2IOUT2 GND RFINRFIN+ V

CC

QOUT2 DCQ2DCQ2+ QIN2-

CEXT-

CEXT+

V

CC

X2_EN

GND

LNAIN

GND GND

GAIN_SET

SHDN

AGC

V

CC

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

GND

LNAOUT

GND

MIX_Q

V

CC

QIN1+

QIN1-

DCQ1+

DCQ1-

QOUT1

MIXTNK

QIN2+

VCCLO

GND

MIX_I

GND

IIN1+

IIN1-

DCI1+

DCI1-

IOUT1

VCCIIN2+

TQFP-EP

MAX2700 MAX2701

TOP VIEW

Pin Configuration

19-1667; Rev 0; 4/00

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.

Ordering Information

PART

TEMP. RANGE

PIN-PACKAGE

MAX2700ECM -40°C to 85°C 48 TQFP-EP MAX2701ECM -40°C to 85°C 48 TQFP-EP

MAX2700/MAX2701

1.8GHz to 2.5GHz Direct Downconversion Receivers

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

DC ELECTRICAL CHARACTERISTICS

(MAX2700/MAX2701 EV kit (Figure 3), VCC= +2.7V to +3.3V, SHDN = GAIN_SET = VCC, X2_EN = GND, V

AGC

= 1.25V, CEXT+ con-

nected to CEXT-; no RF input signals applied; RFIN, LNAIN, LO inputs are terminated with 50Ω, LNAOUT connected to V

CC

through a 10nH inductor; MIX_I, MIX_Q, QIN1+, QIN1-, QOUT1, IIN1+, IIN1-, IOUT1, QIN2+, QIN2-, QOUT2, IIN2+, IIN2-, IOUT2 pins are unconnected; T

A

= -40°C to +85°C, unless otherwise noted. Typical values are at VCC= +3.0V, TA= +25°C.)

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

RF Signals

P

RFIN

, P

LNAIN

, PLO.....................................................+15dBm

Baseband Signals

IIN1+ to IIN1-, IIN2+ to IIN2-,

QIN1+ to QIN1-, QIN2+ to QIN2-......................................±2V

Input Voltages

AGC, GAIN_SET, SHDN, X2_EN

, CEXT_, RFIN_, LO, LNAIN, IIN_ _,

QIN_ _ , DCI_ _ , DCQ_ _ to GND..........-0.3V to (V

CC

+ 0.3V)

Input Current

AGC……………………………………………………..±50mA All Digital Inputs………………………………………..±10mA

Continuous Power Dissipation (T

A

= +70°C)

48-Pin TQFP-EP (derate 27mW/°C above +70°C).....2000mW

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

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

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

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

PARAMETERS CONDITIONS

MIN

TYP

MAX

UNITS

SUPPLY

Supply Voltage 2.7 3.3 V

MAX2700

LNA enabled

MAX2701 MAX2700

T

A

= +25°C

LNA disabled

MAX2701 MAX2700

LNA enabled

MAX2701 MAX2700

Operating Supply Current

T

A

= -40°C to +85°C

LNA disabled

MAX2701

mA

Shutdown Supply Current SHDN = GND, V

AGC

= 0.5V 20

µA

CONTROL INPUTS/OUTPUTS

Input Logic Voltage High 2V Input Logic Voltage Low 0.6 V

SHDN, X2_EN, GAIN_SET -1 0.5 AGC, +0.5 < V

AGC

< +2.0V -22 12

Input Bias Current

AGC, V

AGC

= 0.5V, SHDN = GND -2 2

µA

MIX_I, MIX_Q 1.2 IOUT1, QOUT1 1.1

DC Output Voltage

IOUT2, QOUT2

V

165 215 167 220 155 200 156 205

230 235 210

1.25

215 100

MAX2700/MAX2701

1.8GHz to 2.5GHz Direct Downconversion Receivers

_______________________________________________________________________________________ 3

AC ELECTRICAL CHARACTERISTICS

(MAX2700/MAX2701 EV kit (Figure 3), VCC= +3.0V, TA= +25°C, SHDN = GAIN_SET = VCC, X2_EN = GND, CEXT+ connected to CEXT-, P

LO

= -13dBm, FLO= 980MHz (MAX2700) and 1200MHz (MAX2701), P

LNAIN

= -30dBm, P

RFIN

= -25dBm, LNAIN and RFIN (single-ended input to balun) driven from 50Ω source, LNAOUT terminated into load; MIX_I, MIX_Q AC-coupled to 2kΩ load; IIN1+, QIN1+, IIN2+, QIN2+ driven from 1.1kΩ AC-coupled source; IOUT1, QOUT1 AC-coupled to 2kΩ; IOUT2, QOUT2 AC-coupled to 100Ω; input to VGAs, 20mVp-p at 1MHz tone, set V

AGC

= 1.25V, unless otherwise noted.)

PARAMETERS CONDITIONS

MIN

TYP

MAX

UNITS

LNA STAGE

MAX2700

Operating Frequency Range (Note 1)

MAX2701

MHz

GAIN_SET = V

CC

MAX2700, f

LNAIN

= 1960MHz

GAIN_SET = GND

2

GAIN_SET = V

CC

13 20

TA = -40°C to 85°C

GAIN_SET = GND -8 2.5 GAIN_SET = V

CC

13

MAX2701, f

LNAIN

= 2400MHz

GAIN_SET = GND -6

0.5

GAIN_SET = V

CC

19

Power Gain (Note 2)

T

A

= -40°C to 85°C

GAIN_SET = GND

1.0

dB

GAIN_SET = V

CC

2.0

MAX2700, f

LNAIN

= 1960MHz

GAIN_SET = GND GAIN_SET = V

CC

2.3

Noise Figure

MAX2701, f

LNAIN

= 2400MHz

GAIN_SET = GND

dB

GAIN_SET = V

CC

MAX2700, f

LNAIN

= 1960MHz

GAIN_SET = GND GAIN_SET = V

CC

Input Third-Order Intercept (Note 3)

MAX2701, f

LNAIN

= 2400MHz

GAIN_SET = GND

dBm

Reverse Isolation 1800MHz to 2500MHz, GAIN_SET = VCC or GND 28 dB

LNAIN to LO, f

LNAIN

= 1800MHz to 2500MHz 30

Isolation

LNAOUT to RFIN, f

LNAIN

= 1800 MHz to 2500 MHz 44

dB

1.1

GAIN_SET = GND 1.8

1.3

At LNA input, with external matching circuit at LNAIN

GAIN_SET = GND 2.1

1.7

GAIN_SET = GND 1.6

1.2

VSWR

At LNA output, with external

GAIN_SET = GND 1.4

−

MIXER STAGE ( D i ffer enti al RF i np ut to m i xer I/Q outp uts w i th exter nal b al un and m atchi ng ci r cui t to 50Ω)

MAX2700

Frequency Range (Notes 1, 2)

MAX2701

MHz

MAX2700, f

RFIN

= 1960 MHz 16

Voltage Gain

MAX2701, f

RFIN

= 2400 MHz

20

dB

MAX2700, f

RFIN

= 1960MHz

DSB Noise Figure

MAX2701, f

RFIN

= 2400MHz

dB

matching circuit at LNAOUT

M AX2700 GAI N _S ET = V

M AX2701 GAI N _S ET = V

M AX2700 GAI N _S ET = V

M AX2701 GAI N _S ET = V

1800 2100 2100 2500

13.5 17.1 19.5

-7.5 -1.9

12.5

-6.5

C C

1800 2100 2100 2500

14.5 18.1

16.5 18.5

-1.8

15.8

16.7 +2.7 +5.1 +3.8 +4.3

19.3 21.5

11.0

12.8

MAX2700/MAX2701

1.8GHz to 2.5GHz Direct Downconversion Receivers

4 _______________________________________________________________________________________

PARAMETERS CONDITIONS

MIN

TYP

MAX

UNITS

MAX2700, fLO = 980MHz

Input Third-Order Intercept (Note 4)

MAX2701, f

LO

= 1200MHz

dBm

MAX2700

Input Second-Order Intercept (Note 5)

MAX2701 +38

dBm

MAX2700 1.5

VSWR

W i th 50Ω exter nal m atchi ng at RFIN + / RFIN -

MAX2701 1.2

–

f

RFIN

= 1800MHz to

2100MHz

35

MAX2700

f

RFIN

≤20MHz 28

f

RFIN

= 2100MHz to

2500MHz

22

Isolation (RFIN to MIX_I/Q)

MAX2701

f

RFIN

≤20MHz 12

dB

MAX2700, f

RFIN

= 1800MHz to 2100MHz 38

Isolation (RFIN to LO)

MAX2701, f

RFIN

= 2100MHz to 2500MHz 45

dB

fLO = 900MHz to 1050MHz, X2_EN = GND

49

fLO = 900MHz to 1050MHz, X2_EN = GND, isolation at 2 x F

LO

43

MAX2700

f

LO

= 1800MHz to

2100MHz, X2_EN = V

CC

33

dB

X2_EN = GND

60

2 x F

LO

44

Isolation (LO to RFIN)

MAX2701

fLO = 2100MHz to 2500MHz, X2_EN = V

CC

70

Mixer Spurious Suppression 2 x LO - RF (Note 6) 60 dBc

-1dB bandwidth (Note 2) 37 69

Baseband Bandwidth MIX_I/Q

-3dB bandwidth

MHz

Baseband frequency = 125kHz

0.1 0.7

Gain Mismatch

∆G

V

(I-Q) (between mixer

I and Q channels)

Up to -1dB baseband width (Note 2)

0 0.7

dB

AC ELECTRICAL CHARACTERISTICS (continued)

(MAX2700/MAX2701 EV kit (Figure 3), VCC= +3.0V, TA= +25°C, SHDN = GAIN_SET = VCC, X2_EN = GND, CEXT+ connected to CEXT-, P

LO

= -13dBm, FLO= 980MHz (MAX2700) and 1200MHz (MAX2701), P

LNAIN

= -30dBm, P

RFIN

= -25dBm, LNAIN and RFIN (single-ended input to balun) driven from 50Ω source, LNAOUT terminated into load; MIX_I, MIX_Q AC-coupled to 2kΩ load; IIN1+, QIN1+, IIN2+, QIN2+ driven from 1.1kΩ AC-coupled source; IOUT1, QOUT1 AC-coupled to 2kΩ; IOUT2, QOUT2 AC-coupled to 100Ω; input to VGAs, 20mVp-p at 1MHz tone, set V

AGC

= 1.25V, unless otherwise noted.)

fLO = 1050MHz to 1250MHz,

fLO = 1050MHz to 1250MHz, X2_EN = GND, isolation at

+6.3 +6.5 +28.3

170

MAX2700/MAX2701

1.8GHz to 2.5GHz Direct Downconversion Receivers

_______________________________________________________________________________________ 5

PARAMETERS CONDITIONS

MIN

TYP

MAX

UNITS

Group Delay

t

gd

, RFIN to MIX_I/Q, frequency up to

-1dB baseband width

1.8 ns

Differential Group Delay (Note 2)

∆t

gd

(between mixer I and Q channels) 1 ns

Output Impedance

Z

out

, MIX_I, MIX_Q, frequency up to -1dB baseband

width

1.4 Ω

Mixer Output Level (Note 2)

MIX_I, MIX_Q, baseband output at -1dB compression point

1.4 2.1

Vp-p

LO DOUBLER, LO BUFFER, QUADRATURE GENERATOR

MAX2700

X2_EN = GND

MAX2701 MAX2700

LO Frequency Range (Notes 1, 2)

X2_EN = V

CC

MAX2701

MHz

LO Input Power (Note 7) X2_EN = VCC or GND -16 -13 -10

dBm

fLO = 900MHz to 1050MHz, X2_EN = GND

2.0

MAX2700

f

LO

= 1800MHz to

2100MHz, X2_EN = V

CC

1.8

fLO = 1050MHz to 1250MHz, X2_EN = GND

1.7

LO VSWR

MAX2701

f

LO

= 2100MHz to

2500MHz, X2_EN = V

CC

2.0

−

Quadrature Error ∆φ , MIX_I to MIX_Q 1.5 4.5

degrees

BASEBAND STAGE 1 (IIN1 TO IOUT1, QIN1 TO QOUT1)

-1dB bandwidth (Note 2) 14 26

Channel Bandwidth

-3dB bandwidth 56

MHz

Input Impedance IIN1+, IIN1-, QIN1+, QIN1-, single-ended 1.9 kΩ Input Impedance Mismatch Between IIN1+ and QIN1+ 4 Ω

V

AGC

= 0.5V

2.2 6

Voltage Gain (GV)

V

AGC

= 2.0V 37 40 42

dB

Voltage Gain Mismatch

Mismatch between IIN1 to IOUT1 and QIN1 to QOUT1,

0.5V < V

AGC

< 2 V

0.2 dB

VGA1 Gain Slope

Guaranteed Monotonic over 0.5V <V

AGC

< 2V,

V

AGC

= 1.25V

34

dB/V

V

AGC

= 2.0V 7.5

Noise Figure Z

S

=

1.1kΩ (Note 8) V

AGC

= 0.5V 34

dB

Phase Shift (Note 2) For 10dB of gain (with AGC) 0.5 0.9

degrees

AC ELECTRICAL CHARACTERISTICS (continued)

(MAX2700/MAX2701 EV kit (Figure 3), VCC= +3.0V, TA= +25°C, SHDN = GAIN_SET = VCC, X2_EN = GND, CEXT+ connected to CEXT-, P

LO

= -13dBm, FLO= 980MHz (MAX2700) and 1200MHz (MAX2701), P

LNAIN

= -30dBm, P

RFIN

= -25dBm, LNAIN and RFIN (single-ended input to balun) driven from 50Ω source, LNAOUT terminated into load; MIX_I, MIX_Q AC-coupled to 2kΩ load; IIN1+, QIN1+, IIN2+, QIN2+ driven from 1.1kΩ AC-coupled source; IOUT1, QOUT1 AC-coupled to 2kΩ; IOUT2, QOUT2 AC-coupled to 100Ω; input to VGAs, 20mVp-p at 1MHz tone, set V

AGC

= 1.25V, unless otherwise noted.)

900 1050 1050 1250 1800 2100 2100 2500

-1.5

MAX2700/MAX2701

1.8GHz to 2.5GHz Direct Downconversion Receivers

6 _______________________________________________________________________________________

AC ELECTRICAL CHARACTERISTICS (continued)

(MAX2700/MAX2701 EV kit (Figure 3), VCC= +3.0V, TA= +25°C, SHDN = GAIN_SET = VCC, X2_EN = GND, CEXT+ connected to CEXT-, P

LO

= -13dBm, FLO= 980MHz (MAX2700) and 1200MHz (MAX2701), P

LNAIN

= -30dBm, P

RFIN

= -25dBm, LNAIN and RFIN (single-ended input to balun) driven from 50Ω source, LNAOUT terminated into load; MIX_I, MIX_Q AC-coupled to 2kΩ load; IIN1+, QIN1+, IIN2+, QIN2+ driven from 1.1kΩ AC-coupled source; IOUT1, QOUT1 AC-coupled to 2kΩ; IOUT2, QOUT2 AC-coupled to 100Ω; input to VGAs, 20mVp-p at 1MHz tone, set V

AGC

= 1.25V, unless otherwise noted.)

PARAMETERS CONDITIONS

MIN

TYP

MAX

UNITS

IIN1+ to IOUT1, up to -1dB frequency 1.6

Group Delay

QIN1+ to QOUT1, up to -1dB frequency 1.6

ns

G r oup D el ay M i sm atch ( N ote 2) Between I and Q channel from 100kHz up to -1dB

0.3 1.3 ns Output Impedance IOUT1, QOUT1, up to -1dB bandwidth 7 Ω Output Impedance Mismatch Between IOUT1 and QOUT1, up to -1dB bandwidth 1 Ω Output Voltage (Note 2) At -1dB compression point, IOUT1, QOUT1

0.7 1.1

Vp-p

BASEBAND STAGE 2 (IIN2+ TO IOUT2, QIN2+ TO QOUT2)

-1dB bandwidth (Note 2) 19 34

Channel Bandwidth

-3dB bandwidth 63

MHz

Input Impedance IIN2+, IIN2-, QIN2+, QIN2-, single-ended 2.1 KΩ Input Impedance Mismatch Between IIN2+ and QIN2+

1.5

Ω

V

AGC

= 0.5V

4.4 9.5 Voltage Gain (GV)

V

AGC

= 2.0V 37 39 42

dB

Gain Correction Disabled

0.9 Voltage Gain Mismatch

(Note 2)

M i sm atch b etw een IIN 2 to IOU T2 and QIN 2 to QOU T2, 0.5V < V

AGC

< 2V

Gain Correction Enabled (2dB initial mismatch)

0.3

dB

VGA2 Gain Slope

Guaranteed monotonic over 0.5V < V

AGC

<2V,

V

AGC

=1.25V

30

dB/V

V

AGC

= 2.0V 14

Noise Figure Z

S

=

1.1kΩ V

AGC

= 0.5V 47

dB

Phase shift (Note 2) For 10dB of gain 0.2 1.4

degrees

Group Delay IIN2+ to IOUT2, QIN 2+ to QOU T2 , up to -1dB Frequency 1.7 ns Group Delay Mismatch

(Note 2)

Between I and Q channel from 100kHz up to -1dB frequency

0.2 2.0 ns

Output Impedance IOUT2 , QOUT2, up to -1dB bandwidth 4.0 Ω Output Impedance Mismatch Between IOUT2 and QOUT2, up to -1 dB bandwidth 4.0 Ω Output Voltage (Note 2) At -1dB compression point, IOUT2 , QOUT2 1.2 1.9

Vp-p

-0.6

MAX2700/MAX2701

1.8GHz to 2.5GHz Direct Downconversion Receivers

_______________________________________________________________________________________ 7

Note 1: This is the recommended operating frequency range. The parts have been characterized over the specified frequency

range. Operation outside this range is possible but not guaranteed.

Note 2: Guaranteed by design and characterization. Note 3: LNA is matched at input and output to 50Ω; f

1

= 1960MHz, f2= 1965MHz for MAX2700; f1= 2400MHz, f2= 2405MHz for

MAX2701; P

IN

= -30dBm per tone.

Note 4: Mixer IIP3 test. For MAX2700, RFIN is matched to 50Ω at 1960MHz. At RFIN, apply f

1

= 1964.2MHz, f2= 1968.2MHz, PIN=

-25dBm per tone, and measure IM3 product power level at 200kHz. For MAX2701, RFIN is matched to 50Ω at 2400MHz. At RFIN, apply f

1

= 2404.2MHz, f2= 2408.2MHz, PIN= -25dBm per tone, and measure IM3 product power level at 200kHz.

Note 5: Mixer IIP2 test. For MAX2700, RFIN is matched to 50Ω at 1960MHz. At RFIN, apply f

1

= 1964.2MHz, f2= 1968.2MHz, PIN=

-25dBm per tone, and measure IM2 product power level at 4MHz. For MAX2701, RFIN is matched to 50Ω at 2400MHz. At RFIN, apply f

1

= 2404.2MHz, f2= 2408.2MHz, PIN= -25dBm per tone, and measure IM2 product power level at 4MHz.

Note 6: Mixer spurious attenuation response. Mixer is matched to 50Ω at 1800MHz and F

LO

= 900MHz (LO doubler enabled).

F

RFIN

= 1801MHz, P

RFIN

= -85dBm, F

SPUR

= 3601.5MHz, P

SPUR

= -60dBm. Measure IF at 1MHz and spurious at 1.5MHz at the output. For better than 38dBc spurious attenuation response, output spurious level should be at least 10dB lower than the IF signal level. In the (2 x LO) - (1 x RF) spurious product notation, LO denotes the frequency of the final LO driving the I/Q mixers inputs.

Note 7: Mixer gain specifications are production tested over LO power range. Note 8: A filter output impedance of 1.1kΩ can directly drive the VGA inputs since there is minimal mismatch loss between source and

VGA input impedance.

Note 9: Electrolytic bypass cap to V

CC

not connected.

AC ELECTRICAL CHARACTERISTICS (continued)

(MAX2700/MAX2701 EV kit (Figure 3), VCC= +3.0V, TA= +25°C, SHDN = GAIN_SET = VCC, X2_EN = GND, CEXT+ connected to CEXT-, P

LO

= -13dBm, FLO= 980MHz (MAX2700) and 1200MHz (MAX2701), P

LNAIN

= -30dBm, P

RFIN

= -25dBm, LNAIN and RFIN (single-ended input to balun) driven from 50Ω source, LNAOUT terminated into load; MIX_I, MIX_Q AC-coupled to 2kΩ load; IIN1+, QIN1+, IIN2+, QIN2+ driven from 1.1kΩ AC-coupled source; IOUT1, QOUT1 AC-coupled to 2kΩ; IOUT2, QOUT2 AC-coupled to 100Ω; input to VGAs, 20mVp-p at 1MHz tone, set V

AGC

= 1.25V, unless otherwise noted.)

PARAMETERS CONDITIONS

MIN

TYP

MAX

UNITS

POWER SUPPLY

Mixer 57 VGA1 35

Power-Supply Ripple Rejection

V

C C

= 3.0V + 100m V

P P

fr eq uency = 100 to 300k H z, V

OU T

= 0.3Vp - p , ( N ote 9)

VGA2 28

dBc

MAX2700/MAX2701

1.8GHz to 2.5GHz Direct Downconversion Receivers

8 _______________________________________________________________________________________

Typical Operating Characteristics

(MAX2700/MAX2701 EV kit (Figure 3), VCC= +3.0V, TA= +25°C, SHDN = GAIN_SET = VCC, X2_EN = GND, CEXT+ connected to CEXT-, P

LO

= -13dBm, FLO= 980MHz (MAX2700) and 1200MHz (MAX2701), P

LNAIN

= -30dBm, P

RFIN

= -25dBm, LNAIN and RFIN

(single-ended input to balun) driven from 50Ω source, LNAOUT terminated into load; MIX_I, MIX_Q AC-coupled to 2kΩ load; IIN1+, QIN1+, IIN2+, QIN2+ driven from 1.1kΩ AC-coupled source; IOUT1, QOUT1 AC-coupled to 2kΩ; IOUT2, QOUT2 AC-coupled to 100Ω; input to VGAs, 20mVp-p at 1MHz tone, set V

AGC

= 1.25V, unless otherwise noted.)

180

170

160

150

140

2.5 2.92.7 3.1 3.3 3.5

ICC vs. VCC vs. TEMPERATURE

MAX2700-01

VCC (V)

I

CC

(mA)

TA = +25°C

TA = -45°C

TA = +85°C

10

12

16

14

18

20

1700 19001800 2000 2100

LNA GAIN vs. FREQUENCY

vs. TEMPERATURE

MAX2700-02

FREQUENCY (MHz)

GAIN (dB)

TA = -45°C

TA = +25°C

TA = +85°C

HIGH-GAIN MODE

-25

-30

-35

-40 1700 19001800 2000 2100

LNA REVERSE ISOLATION

vs. FREQUENCY vs. GAIN MODE

MAX2700-04

FREQUENCY (MHz)

S

12

(dB)

HIGH-GAIN MODE

LOW-GAIN MODE

1.4

1.8

1.6

2.2

2.0

2.6

2.4

1700 1800 18501750 1900 1950 2000

LNA NOISE FIGURE vs. FREQUENCY

vs. TEMPERATURE

MAX2700-05

FREQUENCY (MHz)

NF (dB)

TA = +85°C

TA = +25°C

TA = -45°C

HIGH-GAIN MODE

-10

-8

-6

-4

-2

0

2

4

1700 1800 1900 2000 2100

LNA GAIN vs. FREQUENCY

vs. TEMPERATURE

MAX2700-03

FREQUENCY (MHz)

GAIN (dB)

TA = -45°C

TA = +25°C

TA = +85°C

LOW-GAIN MODE

MAX2700

MAX2700/MAX2701

1.8GHz to 2.5GHz Direct Downconversion Receivers

_______________________________________________________________________________________ 9

10

12

14

16

18

20

22

24

1.7 1.8 1.9 2.0 2.1

MIXER VOLTAGE GAIN vs. FREQUENCY

vs. TEMPERATURE

MAX2700-09

FREQUENCY (GHz)

VOLTAGE GAIN (dB)

TA = -45°C

TA = +85°C

TA = +25°C

DOUBLER ENABLED

13

14

16

15

17

18

LNA NOISE FIGURE vs. FREQUENCY

vs. TEMPERATURE

MAX2700-06

FREQUENCY (MHz)

NF (dB)

1700 19001800 2000

TA = +85°C

TA = +25°C

TA = -45°C

LOW-GAIN MODE

10

12

14

16

18

20

22

24

1.7 1.8 1.9 2.0 2.1

MIXER VOLTAGE GAIN vs. FREQUENCY

vs. TEMPERATURE

MAX2700-10

FREQUENCY (GHz)

VOLTAGE GAIN (dB)

TA = -45°C

TA = +85°C

TA = +25°C

DOUBLER DISABLED

10

12

14

16

18

20

22

24

1.7 1.8 1.9 2.0 2.1

MIXER VOLTAGE GAIN vs. FREQUENCY

vs. LO POWER

MAX2700-11

FREQUENCY (GHz)

VOLTAGE GAIN (dB)

LO = -16dBm TO -10dBm

DOUBLER DISABLED

Typical Operating Characteristics (continued)

(MAX2700/MAX2701 EV kit (Figure 3), VCC= +3.0V, TA= +25°C, SHDN = GAIN_SET = VCC, X2_EN = GND, CEXT+ connected to CEXT-, P

LO

= -13dBm, FLO= 980MHz (MAX2700) and 1200MHz (MAX2701), P

LNAIN

= -30dBm, P

RFIN

= -25dBm, LNAIN and RFIN (single-ended input to balun) driven from 50Ω source, LNAOUT terminated into load; MIX_I, MIX_Q AC-coupled to 2kΩ load; IIN1+, QIN1+, IIN2+, QIN2+ driven from 1.1kΩ AC-coupled source; IOUT1, QOUT1 AC-coupled to 2kΩ; IOUT2, QOUT2 AC-coupled to 100Ω; input to VGAs, 20mVp-p at 1MHz tone, set V

AGC

= 1.25V, unless otherwise noted.)

0

2

1

4

3

5

6

-45 15 35-25 -5 55 75

LNA IIP3 vs. TEMPERATURE

MAX2700-07

TEMPERATURE (°C)

IIP3 (dBm)

HIGH-GAIN MODE

LOW-GAIN MODE

0

1.0

1.5

2.0

2.5

3.0

3.5

4.0

4.5

2.50 2.75 3.00 3.25 3.50

LNA IIP3 vs. V

CC

MAX2700-08

VCC (V)

IIP3 (dBm)

0.5

HIGH-GAIN MODE

LOW-GAIN MODE

MAX2700