Rainbow Electronics MAX2684 User Manual

General Description

The MAX2683/MAX2684 are super-high-performance,
low-cost downconverter mixers intended for wireless
local loop (WLL) and digital microwave radio (DMR)
applications in the 3.4GHz to 3.8GHz frequency band.
The MAX2683 is optimized for downconversion to IF
frequencies between 100MHz and 400MHz, and allows
both high-side and low-side local oscillator (LO) injec­tion. The MAX2684 is optimized for IF frequencies
between 800MHz and 1000MHz, and allows low-side
LO injection. A logic-level control enables an internal
frequency doubler on both devices, allowing the exter­nal LO source to run at full or half frequency. An internal
LO filter reduces LO harmonics and spurious mixing.

The MAX2683/MAX2684 feature an externally adjustable
bias control, set with a single resistor, that lets the user
trade supply current for linearity to optimize system per­formance. These devices use a double-balanced
Gilbert-cell architecture with single-ended RF and LO
inputs and differential open-collector IF output ports.
Differential IF ports provide a wideband, flexible inter­face for either single-ended or differential applications.

The MAX2683/MAX2684 operate from a single +2.7V to
+5.5V supply. The devices are packaged in an ultra­small 16-pin TSSOP-EP package with an exposed pad­dle for optimum performance at 3.5GHz.

________________________Applications

Wireless Local Loop (WLL)

Digital Microwave Radio (DMR)

Wireless Broadband Access

Features

♦ 3.4GHz to 3.8GHz RF Frequency Range

♦ 100MHz to 400MHz IF Frequency Range

(MAX2683)

800MHz to 1000MHz IF Frequency Range
(MAX2684)

♦ Logic-Enabled LO Frequency Doubler

♦ Conversion Gain

+6.7dB (MAX2683)
+1dB (MAX2684)

♦ Programmable IIP3

+7dBm to +11dBm (MAX2683)
+8dBm to +12dBm (MAX2684)

♦ +2.7V to +5.5V Single-Supply Operation

♦ Ultra-Small 16-Pin TSSOP-EP Package

MAX2683/MAX2684

3.5GHz Downconverter Mixers
with Selectable LO Doubler

________________________________________________________________ Maxim Integrated Products 1

Pin Configuration

19-1620; Rev 1; 5/01

EVALUATION KIT

AVAILABLE

Ordering Information

Typical Operating Circuit appears at end of data sheet.

16 TSSOP-EP*

PIN-PACKAGETEMP. RANGE

-40°C to +85°C

MAX2683EUE

PART

16 TSSOP-EP*-40°C to +85°C

MAX2684EUE

*Exposed pad

Functional Diagram

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

16

BIAS

15

GND

14

IFOUT+

MAX2683
MAX2684

TSSOP-EP

13

GND

12

GND

IFOUT-

11

10

GND

9

GND

RFIN

V

BIAS

GND

TOP VIEW

IFOUT+

IFOUT-

CC

BIAS

LO
BUFFER

x1

MAX2683
MAX2684

LOX1 LOX2

DOUBLER

LO

x2

ENX2

V

GND

GND

RFIN

GND

ENX2

LOX2

LOX1

1

CC

2

3

4

5

6

7

8

MAX2683/MAX2684

3.5GHz Downconverter Mixers
with Selectable LO Doubler

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

DC ELECTRICAL CHARACTERISTICS

(VCC= +2.7V to +5.5V; R

BIAS

= 1.2kΩ; ENX2 = GND; RFIN, LOX1, and LOX2 are terminated in 50Ω, no input signal applied; IFOUT+

= IFOUT- = V

CC

, TA= -40°C to +85°C, unless otherwise noted. Typical values are at VCC= +5V, TA= +25°C.) (Note 1)

AC ELECTRICAL CHARACTERISTICS—MAX2683

(MAX2683/MAX2684 EV kit, VCC= +5V, R

BIAS

= 1.2kΩ, ENX2 = GND, fRF= 3.6GHz, PRF= -20dBm, f

LOX2

= 1650MHz, PLO= -5dBm,

all input/output ports terminated in 50Ω, IFOUT+ and IFOUT- matched to single-ended 50Ω load, 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...........................................................-0.3V to +6.0V

IFOUT+, IFOUT-, ENX2, BIAS to GND .......-0.3V to (V

CC

+ 0.3V)

RFIN Input Power (50Ω source) .....................................+10dBm

LO Input Power (50Ω source) ........................................+10dBm

R

BIAS

.............................................................................820Ω min

Continuous Power Dissipation (TA= +70°C)

16-pin TSSOP-EP (derate 21.3mW/°C

above +70°C).............................................................1702mW

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

PARAMETER

MIN TYP MAX

UNITS

Gain Variation Over
Temperature

±0.5 ±1.2 dB

Conversion Gain 4.8 6.7 8.0 dB

Input 1dB Compression Point +0.8 dBm

Input Third-Order Intercept Point +8.8 dBm

Input Second-Order Intercept
Point

+33 dBm

Noise Figure 12 dB

IF Frequency Range

RF Frequency Range 3.4 3.8 GHz

100 400 MHz

LOX1 Frequency Range 3.0 3.9 GHz

RFIN Input Return Loss -18 dB

LOX2 Leakage at RFIN

-42

dBm

-38

-49

LOX1 Leakage at RFIN -39 dBm

CONDITIONS

(Note 8)

TA= -40°C to +85°C (Note 2)

f

RFIN

= 3 × f

LO

(Notes 1, 4)

(Note 5)

(Note 6)

(Note 7)

(Notes 2, 3)

(Notes 2, 3)

ENX2 = V

CC

(Notes 2, 3)

f

RFIN

= 2 × f

LO

f

RFIN

= 1 × f

LO

ENX2 = GND

LOX2 Frequency Range 1.5 1.95 GHz

ENX2 = GND (Notes 2, 3)

ENX2 = VCC,f

RFIN

= 1 × f

LO, fLOX1

= 3.3GHz

PARAMETER

MIN TYP MAX

UNITS

Input Logic Bias Current

-20 10

µA

Input Logic Voltage Low

0.6

V

Supply Current Reduction when
LO Doubler is Disabled

Supply Current

55 66

mA

15

mA

Input Logic Voltage High

2.0

V

CONDITIONS

ENX2 = V

CC

MAX2683/MAX2684

3.5GHz Downconverter Mixers
with Selectable LO Doubler

_______________________________________________________________________________________ 3

AC ELECTRICAL CHARACTERISTICS—MAX2683 (continued)

(MAX2683/MAX2684 EV kit, VCC= +5V, R

BIAS

= 1.2kΩ, ENX2 = GND, fRF= 3.6GHz, PRF= -20dBm, f

LOX2

= 1650MHz, PLO= -5dBm,

all input/output ports terminated in 50Ω, IFOUT+ and IFOUT- matched to single-ended 50Ω load, T

A

= +25°C, unless otherwise noted.)

AC ELECTRICAL CHARACTERISTICS—MAX2684

(MAX2683/MAX2684 EV kit, VCC= +5V, R

BIAS

= 1.2kΩ, ENX2 = GND, fRF= 3.6GHz, PRF= -20dBm, f

LOX2

= 1350MHz, PLO= -5dBm,

all input/output ports terminated in 50Ω, IFOUT+ and IFOUT- matched to single-ended 50Ω load, T

A

= +25°C, unless otherwise noted.)

Note 1: Limits over temperature are guaranteed by production test at +25°C and via correlation to worst-case temperature testing.
Note 2: Minimum and maximum limits are guaranteed by design and characterization, but are not production tested.
Note 3: The device has been characterized over the specified frequency range. Operation outside of this range is possible but not

guaranteed.

PARAMETER

LOX2 Leakage at IFOUT+,
IFOUT-

-39

dBm-39

-64

LOX1 Leakage at IFOUT+,
IFOUT-

-39 dBm

LOX1, LOX2 Input Return Loss -20 dB

f

IFOUT

= 3 × f

LO

f

IFOUT

= 2 × f

LO

ENX2 = GND

(Note 9)

f

IFOUT

= 1 × f

LO

f

RFIN

= 3 × f

LOX2

f

RFIN

= 2 × f

LOX2

f

RFIN

= 1 × f

LOX2

f

RFIN

= 3 × f

LOX2

f

RFIN

= 2 × f

LOX2

f

RFIN

= 1 × f

LOX2

LOX1 Leakage at IFOUT+,
IFOUT-

-15 dBm

LOX1, LOX2 Input Return Loss -20 dB(Note 9)

LOX2 Leakage at IFOUT+,
IFOUT-

-37

dBm

ENX2 = GND

-20

-41

-49

LOX1 Leakage at RFIN -45 dBm

Noise Figure 13.6 dB

RFIN Input Return Loss -18 dB(Note 8)

(Note 7)

LOX2 Leakage at RFIN

-47

dBm-43

ENX2 = GND

Input Third-Order Intercept Point +9.5 dBm

Input Second-Order Intercept
Point

+37 dBm(Note 11)

(Note 10)

PARAMETER

MIN TYP MAX

UNITS

Conversion Gain -0.8 +1 +2.3 dB

LOX1 Frequency Range 2.4 2.9 GHz

Gain Variation Over
Temperature and Frequency

±0.5 ±1.2 dB

IF Frequency Range

RF Frequency Range 3.4 3.8 GHz

800 1000 MHz

LOX2 Frequency Range 1.2 1.45 GHz

Input 1dB Compression Point 0 dBm

CONDITIONS

(Notes 1, 4)

LOX2 = VCC(Notes 2, 3)

TA= -40°C to +85°C

(Notes 2, 3)

(Notes 2, 3)

LOX2 = GND (Notes 2, 3)

ENX2 = VCC, f

IFOUT

= 1 × f

LO, fLOX1

= 3.3GHz

ENX2 = VCC, f

RFIN

= 1 × f

LOX1, fLOX1

= 2.7GHz

ENX2 = VCC, f

IFOUT

= 1 × f

LOX1, fLOX1

= 2.7GHz

MIN TYP MAX

UNITS

CONDITIONS

MAX2683/MAX2684

3.5GHz Downconverter Mixers
with Selectable LO Doubler

4 _______________________________________________________________________________________

Typical Operating Characteristics

(MAX2683/MAX2684 EV kit, VCC= +5V, R

BIAS

= 1.2kΩ, ENX2 = GND, fRF= 3.6GHz, PRF= -20dBm, f

LOX2

= 1650MHz for MAX2683 or

f

LOX2

= 1350MHz for MAX2684, PLO= -5dBm, all input/output ports terminated in 50Ω, IFOUT+ and IFOUT- matched to single-ended

50Ω load, TA= +25°C, unless otherwise noted.)

0

30

20

10

40

50

60

70

80

90

100

2.5 3.53.0 4.0 4.5 5.0 5.5

SUPPLY CURRENT vs. SUPPLY VOLTAGE

(ENX2 = GND)

MAX2683/4 toc01

SUPPLY VOLTAGE (V)

SUPPLY CURRENT (mA)

TA = -40°C

R

BIAS

= 820Ω

R

BIAS

= 1.2kΩ

R

BIAS

= 2.0kΩ

TA = +25°C

TA = +85°C

0

30

20

10

40

50

60

70

80

90

100

2.5 3.53.0 4.0 4.5 5.0 5.5

SUPPLY CURRENT vs. SUPPLY VOLTAGE

(ENX2 = V

CC

)

MAX2683/4 toc02

SUPPLY VOLTAGE (V)

SUPPLY CURRENT (mA)

TA = +85°C

TA = +25°C

R

BIAS

= 820Ω

R

BIAS

= 1.2kΩ

R

BIAS

= 2.0kΩ

TA = -40°C

20

35

30

25

40

45

50

55

60

65

70

800 12001000 1400 1600 1800 2000

SUPPLY CURRENT vs. R

BIAS

MAX2683/4 toc03

R

BIAS

(Ω)

SUPPLY CURRENT (mA)

VCC = +5V

VCC = +5V

VCC = +3.3V

VCC = +3.3V

ENX2 = V

CC

ENX2 = GND

5.0

5.5

6.5

6.0

7.0

7.5

800 12001000 1400 1600 1800 2000

CONVERSION GAIN vs. R

BIAS

MAX2683 toc04

R

BIAS

(Ω)

CONVERSION GAIN (dB)

VCC = +5V

VCC = +3.3V

5

7

6

9

8

10

11

800 1200 14001000 1600 1800 2000

INPUT IP3 vs. R

BIAS

MAX2683/4 toc05

R

BIAS

(Ω)

INPUT IP3 (dBm)

VCC = +5V

VCC = +3.3V

-3

-1

-2

1

0

2

3

800 1200 14001000 1600 1800 2000

INPUT P1dB vs. R

BIAS

MAX2683 toc06

R

BIAS

(Ω)

INPUT P1dB (dBm)

VCC = +5V

VCC = +3.3V

MAX2683

Note 4: Conversion gain does not include output balun losses, typically 0.3dB at 300MHz on the MAX2683 EV kit and 0.8dB at

900MHz on the MAX2684 EV kit.

Note 5: IIP3 measured with two tones at 3605MHz and 3610MHz, -20dBm per tone, f

IF

= 300MHz.

Note 6: IIP2 measured with f

RFIN

= 3450MHz, P

RFIN

= -20dBm, fIF= 300MHz.

Note 7: Input match optimized for best return loss at f

RF

= 3600MHz.

Note 8: Over specified RF input frequency range with matching network.
Note 9: Over specified LO input frequency range.
Note 10: IIP3 measured with two tones at 3605MHz and 3610MHz, -20dBm per tone, f

IF

= 900MHz.

Note 11: IIP2 measured with f

RFIN

= 3150MHz, P

RFIN

= -20dBm, fIF= 900MHz.

MAX2683/MAX2684

3.5GHz Downconverter Mixers
with Selectable LO Doubler

_______________________________________________________________________________________ 5

Typical Operating Characteristics (continued)

(MAX2683/MAX2684 EV kit, VCC= +5V, R

BIAS

= 1.2kΩ, ENX2 = GND, fRF= 3.6GHz, PRF= -20dBm, f

LOX2

= 1650MHz for MAX2683 or

f

LOX2

= 1350MHz for MAX2684, PLO= -5dBm, all input/output ports terminated in 50Ω, IFOUT+ and IFOUT- matched to single-ended

50Ω load, T

A

= +25°C, unless otherwise noted.)

MAX2683

CONVERSION GAIN vs. LO POWER

(ENX2 = GND)

10

TA = -40°C

8

6

4

2

0

-2

-4

CONVERSION GAIN (dB)

-6

-8

-10

-20 -15 -10 -5 0

TA = +25°C

TA = +85°C

LO POWER (dBm)

CONVERSION GAIN vs. SUPPLY VOLTAGE

= 820Ω)

(R

10

TA = -40°C

9

8

7

6

5

4

3

CONVERSION GAIN (dB)

2

1

0

2.5 3.53.0 4.0 4.5 5.0 5.5

BIAS

TA = +25°C

TA = +85°C

SUPPLY VOLTAGE (V)

INPUT IP3 vs. SUPPLY VOLTAGE

= 820Ω)

(R

15

12

BIAS

10

MAX2683 toc07

-2

-4

CONVERSION GAIN (dB)

-6

-8

-10

CONVERSION GAIN vs. LO POWER

(ENX2 = V

TA = -40°C

8

6

4

2

0

TA = +85°C

-20 -15 -10 -5 0
LO POWER (dBm)

)

CC

MAX2683 toc08

TA = +25°C

CONVERSION GAIN vs. SUPPLY VOLTAGE

= 1.2kΩ)

(R

10

MAX2683 toc10

CONVERSION GAIN (dB)

9

8

7

6

5

TA = +85°C

4

3

2

1

0

2.5 3.53.0 4.0 4.5 5.0 5.5

BIAS

TA = -40°C

ENX2 = V

CC

ENX2 = GND

SUPPLY VOLTAGE (V)

MAX2683 toc11

TA = +25°C

INPUT IP3 vs. SUPPLY VOLTAGE

= 1.2kΩ)

(R

BIAS

TA = +25°C

TA = +85°C

MAX2683 toc14

MAX2683 toc13

10

9

NOISE FIGURE vs. LO POWER

30

25

20

15

NOSIE FIGURE (dB)

10

5

0

-16 -12-14 -10 -8 -6 -4 -2 0
LO POWER (dBm)

CONVERSION GAIN vs. SUPPLY VOLTAGE

= 2kΩ)

(R

10

9

8

7

6

5

4

3

CONVERSION GAIN (dB)

2

1

0

2.5 3.53.0 4.0 4.5 5.0 5.5

BIAS

TA = -40°C

TA = +25°C

TA = +85°C

SUPPLY VOLTAGE (V)

INPUT IP3 vs. SUPPLY VOLTAGE

= 2kΩ)

(R

10

9

BIAS

MAX2683 toc09

MAX2683 toc12

MAX2683 toc15

9

TA = +25°C

6

INPUT IP3 (dBm)

3

0

2.5 3.53.0 4.0 4.5 5.0 5.5

TA = +85°C

SUPPLY VOLTAGE (V)

TA = -40°C

8

7

INPUT IP3 (dBm)

6

5

2.5 3.53.0 4.0 4.5 5.0 5.5

TA = -40°C

SUPPLY VOLTAGE (V)

8

TA = +85°C

7

INPUT IP3 (dBm)

6

5

2.5 3.53.0 4.0 4.5 5.0 5.5

TA = -40°C

TA = +25°C

SUPPLY VOLTAGE (V)

MAX2683/MAX2684

3.5GHz Downconverter Mixers
with Selectable LO Doubler

6 _______________________________________________________________________________________

Typical Operating Characteristics (continued)

(MAX2683/MAX2684 EV kit, VCC= +5V, R

BIAS

= 1.2kΩ, ENX2 = GND, fRF= 3.6GHz, PRF= -20dBm, f

LOX2

= 1650MHz for MAX2683 or

f

LOX2

= 1350MHz for MAX2684, PLO= -5dBm, all input/output ports terminated in 50Ω, IFOUT+ and IFOUT- matched to single-ended

50Ω load, TA= +25°C, unless otherwise noted.)

MAX2683

INPUT P1dB vs. SUPPLY VOLTAGE

= 820Ω)

(R

10

BIAS

INPUT P1dB vs. SUPPLY VOLTAGE

3

(R

BIAS

= 1.2kΩ)

INPUT P1dB vs. SUPPLY VOLTAGE

= 2kΩ)

(R

0

BIAS

6

2

-2

INPUT P1dB (dBm)

-6

-10

2.5 3.53.0 4.0 4.5 5.0 5.5

TA = +25°C

TA = -40°C

TA = +85°C

SUPPLY VOLTAGE (V)

MAX2683 toc16

INPUT P1dB (dBm)

CONVERSION GAIN vs. RF FREQUENCY

= 1.2kΩ)

(R

10

9

8

7

6

5

TA = +85°C

4

3

CONVERSION GAIN (dB)

2

1

0

3400 3500 35503450 3600 3650 3700 3750 3800

BIAS

ENX2 = V

CC

ENX2 = GND

RF FREQUENCY (MHz)

TA = -40°C

TA = +25°C

MAX2683 toc19

CONVERSION GAIN (dB)

LOX2 PORT RETURN LOSS vs.

LO FREQUENCY (ENX2 = GND)

0

2

1

TA = +25°C

0

-1

-2

2.5 3.53.0 4.0 4.5 5.0 5.5
SUPPLY VOLTAGE (V)

TA = +85°C

TA = -40°C

CONVERSION GAIN vs. FREQUENCY

(ENX2 = GND)

10

9

8

7

6

5

4

3

2

1

0

250 290270 310 330 350

TA = +85°C

IF PORT NARROWBAND MATCH AT 300MHz

IF FREQUENCY (MHz)

TA = -40°C

TA = +25°C

0

MAX2683 toc17

-1

TA = -40°C

-2

-3

INPUT P1dB (dBm)

-4

-5

2.5 3.53.0 4.0 4.5 5.0 5.5

CONVERSION GAIN vs. IF FREQUENCY

10

9

MAX2683 toc20

8

7

6

5

4

3

CONVERSION GAIN (dB)

2

1

0

250 290270 310 330 350

TA = +85°C

IF PORT NARROWBAND MATCH AT 300MHz

LOX1 PORT RETURN LOSS

vs. LO FREQUENCY (ENX2 = V

TA = +85°C

SUPPLY VOLTAGE (V)

(ENX2 = V

IF FREQUENCY (MHz)

)

CC

)

CC

TA = +25°C

MAX2683 toc18

TA = +25°C

TA = -40°C

MAX2683 toc21

-20

-40

-60

RETURN LOSS (dB)

-80

-100
1500 17001600 1800 1900 2000

LO FREQUENCY (MHz)

MAX2683 toc22

-10

-20

-30

RETURN LOSS (dB)

-40

-50
3000 33603180 3540 3720 3900

LO FREQUENCY (MHz)

MAX2683 toc23