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19-1620; Rev 0; 1/00
UAL IT MAN TION K SHEET VALUA E TA WS DA FOLLO
3.5GHz Downconverter Mixers with Selectable LO Doubler
Features
o 3.4GHz to 3.8GHz RF Frequency Range o 100MHz to 400MHz IF Frequency Range (MAX2683) 800MHz to 1000MHz IF Frequency Range (MAX2684) o Logic-Enabled LO Frequency Doubler o Conversion Gain +6.7dB (MAX2683) +1dB (MAX2684) o Programmable IIP3 +7dBm to +11dBm (MAX2683) +8dBm to +12dBm (MAX2684) o +2.7V to +5.5V Single-Supply Operation o Ultra-Small 16-Pin TSSOP-EP Package
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.
MAX2683/MAX2684
Ordering Information
PART MAX2683EUE MAX2684EUE *Exposed pad TEMP. RANGE -40C to +85C -40C to +85C PIN-PACKAGE 16 TSSOP-EP* 16 TSSOP-EP*
________________________Applications
Wireless Local Loop (WLL) Digital Microwave Radio (DMR) Wireless Broadband Access
Typical Operating Circuit appears at end of data sheet.
Functional Diagram
TOP VIEW
RFIN IFOUT+ IFOUTVCC 1 GND 2 BIAS GND 3 RFIN 4 LO BUFFER GND 5 x1 ENX2 6 LO DOUBLER x2 LOX2 7 LOX1 8 LOX1 LOX2 ENX2
Pin Configuration
16 BIAS 15 GND 14 IFOUT+
VCC BIAS GND
MAX2683 MAX2684
13 GND 12 GND 11 IFOUT10 GND 9 GND
MAX2683 MAX2684
TSSOP-EP 1
________________________________________________________________ Maxim Integrated Products
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3.5GHz Downconverter Mixers with Selectable LO Doubler MAX2683/MAX2684
ABSOLUTE MAXIMUM RATINGS
VCC to GND ...........................................................-0.3V to +6.0V IFOUT+, IFOUT-, ENX2, BIAS to GND .......-0.3V to (VCC + 0.3V) RFIN Input Power (50 source) .....................................+10dBm LO Input Power (50 source) ........................................+10dBm RBIAS .............................................................................820 min Continuous Power Dissipation (TA = +70C) 16-pin TSSOP-EP (derate 21.3mW/C above +70C).............................................................1702mW Operating Temperature Range ...........................-40C to +85C Junction Temperature ......................................................+150C Storage Temperature Range ..............................-65C to+150C Lead Temperature (soldering, 10s) .................................+300C
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.
DC ELECTRICAL CHARACTERISTICS
(VCC = +2.7V to +5.5V; RBIAS = 1.2k; ENX2 = GND; RFIN, LOX1, and LOX2 are terminated in 50, no input signal applied; IFOUT+ = IFOUT- = VCC, TA = -40C to +85C, unless otherwise noted. Typical values are at VCC = +5V, TA = +25C.) (Note 1) PARAMETER Supply Current Supply Current Reduction when LO Doubler is Disabled Input Logic Voltage High Input Logic Voltage Low Input Logic Bias Current -20 ENX2 = VCC 2.0 0.6 10 CONDITIONS MIN TYP 55 15 MAX 66 UNITS mA mA V V A
AC ELECTRICAL CHARACTERISTICS--MAX2683
(MAX2683/MAX2684 EV kit, VCC = +5V, RBIAS = 1.2k, ENX2 = GND, fRF = 3.6GHz, PRF = -20dBm, fLOX2 = 1650MHz, PLO = -5dBm, all input/output ports terminated in 50, IFOUT+ and IFOUT- matched to single-ended 50 load, TA = +25C, unless otherwise noted.) PARAMETER RF Frequency Range IF Frequency Range LOX2 Frequency Range LOX1 Frequency Range Conversion Gain Gain Variation Over Temperature Input 1dB Compression Point Input Third-Order Intercept Point (Note 5) Input Second-Order Intercept Point Noise Figure RFIN Input Return Loss LOX2 Leakage at RFIN LOX1 Leakage at RFIN (Note 6) (Note 7) (Note 8) fRFIN = 1 x fLO ENX2 = GND fRFIN = 2 x fLO fRFIN = 3 x fLO (Notes 2, 3) (Notes 2, 3) ENX2 = GND (Notes 2, 3) ENX2 = VCC (Notes 2, 3) (Notes 1, 4) TA = -40C to +85C (Note 2) CONDITIONS MIN 3.4 100 1.5 3.0 4.8 6.7 0.5 +0.8 +8.8 +33 12 -18 -42 -38 -49 -39 dBm TYP MAX 3.8 400 1.95 3.9 8.0 1.2 UNITS GHz MHz GHz GHz dB dB dBm dBm dBm dB dB dBm
ENX2 = VCC, fRFIN = 1 x fLO, fLOX1 = 3.3GHz
2
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3.5GHz Downconverter Mixers with Selectable LO Doubler
AC ELECTRICAL CHARACTERISTICS--MAX2683 (continued)
(MAX2683/MAX2684 EV kit, VCC = +5V, RBIAS = 1.2k, ENX2 = GND, fRF = 3.6GHz, PRF = -20dBm, fLOX2 = 1650MHz, PLO = -5dBm, all input/output ports terminated in 50, IFOUT+ and IFOUT- matched to single-ended 50 load, TA = +25C, unless otherwise noted.) PARAMETER LOX2 Leakage at IFOUT+, IFOUTLOX1 Leakage at IFOUT+, IFOUTLOX1, LOX2 Input Return Loss ENX2 = GND CONDITIONS fIFOUT = 1 x fLO fIFOUT = 2 x fLO fIFOUT = 3 x fLO MIN TYP -39 -39 -64 -39 -20 dBm MAX UNITS
MAX2683/MAX2684
ENX2 = VCC, fIFOUT = 1 x fLO, fLOX1 = 3.3GHz (Note 9)
dBm dB
AC ELECTRICAL CHARACTERISTICS--MAX2684
(MAX2683/MAX2684 EV kit, VCC = +5V, RBIAS = 1.2k, ENX2 = GND, fRF = 3.6GHz, PRF = -20dBm, fLOX2 = 1350MHz, PLO = -5dBm, all input/output ports terminated in 50, IFOUT+ and IFOUT- matched to single-ended 50 load, TA = +25C, unless otherwise noted.) PARAMETER RF Frequency Range IF Frequency Range LOX2 Frequency Range LOX1 Frequency Range Conversion Gain Gain Variation Over Temperature and Frequency Input 1dB Compression Point Input Third-Order Intercept Point (Note 10) Input Second-Order Intercept Point Noise Figure RFIN Input Return Loss LOX2 Leakage at RFIN LOX1 Leakage at RFIN LOX2 Leakage at IFOUT+, IFOUTLOX1 Leakage at IFOUT+, IFOUTLOX1, LOX2 Input Return Loss (Note 11) (Note 7) (Note 8) ENX2 = GND fRFIN = 1 x fLOX2 fRFIN = 2 x fLOX2 fRFIN = 3 x fLOX2 fRFIN = 1 x fLOX2 fRFIN = 2 x fLOX2 fRFIN = 3 x fLOX2 (Notes 2, 3) (Notes 2, 3) LOX2 = GND (Notes 2, 3) LOX2 = VCC (Notes 2, 3) (Notes 1, 4) TA = -40C to +85C CONDITIONS MIN 3.4 800 1.2 2.4 0.8 +1 0.5 0 +9.5 +37 13.6 -18 -47 -43 -49 -45 -37 -20 -41 -15 -20 TYP MAX 3.8 1000 1.45 2.9 +2.3 1.2 UNITS GHz MHz GHz GHz dB dB dBm dBm dBm dB dB dBm dBm dBm
ENX2 = VCC, fRFIN = 1 x fLOX1, fLOX1 = 2.7GHz ENX2 = GND
ENX2 = VCC, fIFOUT = 1 x fLOX1, fLOX1 = 2.7GHz (Note 9)
dBm dB
Note 1: Devices are production tested at TA = +25C. 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.
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3
3.5GHz Downconverter Mixers with Selectable LO Doubler MAX2683/MAX2684
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, fIF = 300MHz. Note 6: IIP2 measured with fRFIN = 3450MHz, PRFIN = -20dBm, fIF = 300MHz. Note 7: Input match optimized for best return loss at fRF = 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, fIF = 900MHz. Note 11: IIP2 measured with fRFIN = 3150MHz, PRFIN = -20dBm, fIF = 900MHz.
Typical Operating Characteristics
(MAX2683/MAX2684 EV kit, VCC = +5V, RBIAS = 1.2k, ENX2 = GND, fRF = 3.6GHz, PRF = -20dBm, fLOX2 = 1650MHz for MAX2683 or fLOX2 = 1350MHz for MAX2684, PLO = -5dBm, all input/output ports terminated in 50, IFOUT+ and IFOUT- matched to single-ended 50 load, TA = +25C, unless otherwise noted.)
MAX2683
SUPPLY CURRENT vs. SUPPLY VOLTAGE (ENX2 = GND)
MAX2683/4 toc01
90 80 SUPPLY CURRENT (mA) 70 60 50 40 30 20 10 0 2.5 3.0 3.5 4.0 4.5 5.0 RBIAS = 2.0k TA = -40C RBIAS = 1.2k RBIAS = 820 TA = +25C TA = +85C
MAX2683/4 toc02
90 80 SUPPLY CURRENT (mA) 70 60 50 40 30 20 10 0 RBIAS = 2.0k TA = -40C 2.5 3.0 3.5 4.0 4.5 5.0 RBIAS = 820 RBIAS = 1.2k TA = +85C TA = +25C
65 60 SUPPLY CURRENT (mA) 55 50 45 40 35 30 25 20 ENX2 = VCC 800 1000 1200 1400 RBIAS () 1600 1800 VCC = +3.3V VCC = +5V VCC = +3.3V VCC = +5V ENX2 = GND
5.5
5.5
2000
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
CONVERSION GAIN vs. RBIAS
MAX2683 toc04
INPUT IP3 vs. RBIAS
VCC = +5V 10 INPUT IP3 (dBm) 9 8 7 6 5 VCC = +3.3V
MAX2683/4 toc05
INPUT P1dB vs. RBIAS
MAX2683 toc06
7.5 VCC = +3.3V
11
3 2 INPUT P1dB (dBm) 1 0 VCC = +3.3V -1 -2 -3
7.0 CONVERSION GAIN (dB)
VCC = +5V
6.5
VCC = +5V
6.0
5.5
5.0 800 1000 1200 1400 RBIAS () 1600 1800 2000
800
1000
1200
1400 RBIAS ()
1600
1800
2000
800
1000
1200
1400 RBIAS ()
1600
1800
2000
4
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MAX2683/4 toc03
100
SUPPLY CURRENT vs. SUPPLY VOLTAGE (ENX2 = VCC)
100 70
SUPPLY CURRENT vs. RBIAS
3.5GHz Downconverter Mixers with Selectable LO Doubler MAX2683/MAX2684
Typical Operating Characteristics (continued)
(MAX2683/MAX2684 EV kit, VCC = +5V, RBIAS = 1.2k, ENX2 = GND, fRF = 3.6GHz, PRF = -20dBm, fLOX2 = 1650MHz for MAX2683 or fLOX2 = 1350MHz for MAX2684, PLO = -5dBm, all input/output ports terminated in 50, IFOUT+ and IFOUT- matched to single-ended 50 load, TA = +25C, unless otherwise noted.)
MAX2683
CONVERSION GAIN vs. LO POWER (ENX2 = GND)
MAX2683 toc07
CONVERSION GAIN vs. LO POWER (ENX2 = VCC)
8 6 CONVERSION GAIN (dB) 4 2 0 -2 -4 -6 -8 -10 0 -20 -15 -10 LO POWER (dBm) -5 0 -16 TA = +85C TA = +25C TA = -40C
MAX2683 toc08
NOISE FIGURE vs. LO POWER
MAX2683 toc09
10 8 6 CONVERSION GAIN (dB) 4 2 0 -2 -4 -6 -8 -10 -20 -15 -10 LO POWER (dBm) -5 0 TA = +85C TA = +25C TA = -40C
10
30 25 NOSIE FIGURE (dB) 20 15 10 5
-14
-12
-10
-8
-6
-4
-2
0
LO POWER (dBm)
CONVERSION GAIN vs. SUPPLY VOLTAGE (RBIAS = 820)
MAX2683 toc10
CONVERSION GAIN vs. SUPPLY VOLTAGE (RBIAS = 1.2k)
MAX2683 toc11
CONVERSION GAIN vs. SUPPLY VOLTAGE (RBIAS = 2k)
9 8 CONVERSION GAIN (dB) 7 6 5 4 3 2 1 0 TA = +85C TA = +25C TA = -40C
MAX2683 toc12
10 9 8 CONVERSION GAIN (dB) 7 6 5 4 3 2 1 0 2.5 3.0 3.5 4.0 4.5 5.0 TA = +85C TA = +25C TA = -40C
10 9 8 CONVERSION GAIN (dB) 7 6 5 4 3 2 1 0 ENX2 = VCC ENX2 = GND 2.5 3.0 3.5 4.0 4.5 5.0 TA = +85C TA = +25C TA = -40C
10
5.5
5.5
2.5
3.0
3.5
4.0
4.5
5.0
5.5
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
INPUT IP3 vs. SUPPLY VOLTAGE (RBIAS = 820)
MAX2683 toc13
INPUT IP3 vs. SUPPLY VOLTAGE (RBIAS = 1.2k)
TA = +85C 9 INPUT IP3 (dBm) TA = +25C INPUT IP3 (dBm)
MAX2683 toc14
INPUT IP3 vs. SUPPLY VOLTAGE (RBIAS = 2k)
MAX2683 toc15
15
10
10
12 INPUT IP3 (dBm)
9
9
TA = +25C TA = -40C
8
8 TA = +85C
6 TA = +85C
7 TA = -40C
7
TA = -40C
3
6
6 TA = +25C
0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 SUPPLY VOLTAGE (V)
5 2.5 3.0 3.5 4.0 4.5 5.0 5.5 SUPPLY VOLTAGE (V)
5 2.5 3.0 3.5 4.0 4.5 5.0 5.5 SUPPLY VOLTAGE (V)
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5
3.5GHz Downconverter Mixers with Selectable LO Doubler MAX2683/MAX2684
Typical Operating Characteristics (continued)
(MAX2683/MAX2684 EV kit, VCC = +5V, RBIAS = 1.2k, ENX2 = GND, fRF = 3.6GHz, PRF = -20dBm, fLOX2 = 1650MHz for MAX2683 or fLOX2 = 1350MHz for MAX2684, PLO = -5dBm, all input/output ports terminated in 50, IFOUT+ and IFOUT- matched to single-ended 50 load, TA = +25C, unless otherwise noted.)
MAX2683
INPUT P1dB vs. SUPPLY VOLTAGE (RBIAS = 820)
MAX2683 toc16
INPUT P1dB vs. SUPPLY VOLTAGE (RBIAS = 1.2k)
MAX2683 toc17
INPUT P1dB vs. SUPPLY VOLTAGE (RBIAS = 2k)
MAX2683 toc18
10
3
0
6 TA = +25C INPUT P1dB (dBm)
2 INPUT P1dB (dBm)
TA = +85C
-1 INPUT P1dB (dBm) TA = -40C -2 TA = +25C TA = +85C
2
1 TA = +25C 0 TA = -40C -1
-2
TA = -40C TA = +85C
-3
-6
-4
-10 2.5 3.0 3.5 4.0 4.5 5.0 5.5 SUPPLY VOLTAGE (V)
-2 2.5 3.0 3.5 4.0 4.5 5.0 5.5 SUPPLY VOLTAGE (V)
-5 2.5 3.0 3.5 4.0 4.5 5.0 5.5 SUPPLY VOLTAGE (V)
CONVERSION GAIN vs. RF FREQUENCY (RBIAS = 1.2k)
MAX2683 toc19
CONVERSION GAIN vs. FREQUENCY (ENX2 = GND)
MAX2683 toc20
CONVERSION GAIN vs. IF FREQUENCY (ENX2 = VCC)
9 8 CONVERSION GAIN (dB) 7 6 5 4 3 2 TA = +85C TA = +25C TA = -40C
MAX2683 toc21
10 9 8 CONVERSION GAIN (dB) 7 6 5 4 3 2 1 0 ENX2 = VCC ENX2 = GND TA = +85C TA = +25C TA = -40C
10 9 8 CONVERSION GAIN (dB) 7 6 5 4 3 2 1 0 250 IF PORT NARROWBAND MATCH AT 300MHz 270 290 310 330 TA = +85C TA = +25C TA = -40C
10
1 0 350 250
IF PORT NARROWBAND MATCH AT 300MHz 270 290 310 330 350
3400 3450 3500 3550 3600 3650 3700 3750 3800 RF FREQUENCY (MHz)
IF FREQUENCY (MHz)
IF FREQUENCY (MHz)
LOX2 PORT RETURN LOSS vs. LO FREQUENCY (ENX2 = GND)
MAX2683 toc22
LOX1 PORT RETURN LOSS vs. LO FREQUENCY (ENX2 = VCC)
MAX2683 toc23
0
0
-20 RETURN LOSS (dB)
-10 RETURN LOSS (dB)
-40
-20
-60
-30
-80
-40
-100 1500 1600 1700 1800 1900 2000 LO FREQUENCY (MHz)
-50 3000 3180 3360 3540 3720 3900 LO FREQUENCY (MHz)
6
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3.5GHz Downconverter Mixers with Selectable LO Doubler
Typical Operating Characteristics (continued)
(MAX2683/MAX2684 EV kit, VCC = +5V, RBIAS = 1.2k, ENX2 = GND, fRF = 3.6GHz, PRF = -20dBm, fLOX2 = 1650MHz for MAX2683 or fLOX2 = 1350MHz for MAX2684, PLO = -5dBm, all input/output ports terminated in 50, IFOUT+ and IFOUT- matched to single-ended 50 load, TA = +25C, unless otherwise noted.)
MAX2683/MAX2684
LOX1 S11 vs. RBIAS (ENX2 = VCC)
MAX2683 LOX2 S11 vs. RBIAS (ENX2 = GND)
820 1.2k 2k
1.2k, 2k, 820
MAX2683 IF PORT S11 vs. RBIAS
MAX2683 RFIN S11 vs. RBIAS
1.2k, 2k, 820k
2k, 1.2k, 820k
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7
3.5GHz Downconverter Mixers with Selectable LO Doubler MAX2683/MAX2684
Typical Operating Characteristics (continued)
(MAX2683/MAX2684 EV kit, VCC = +5V, RBIAS = 1.2k, ENX2 = GND, fRF = 3.6GHz, PRF = -20dBm, fLOX2 = 1650MHz for MAX2683 or fLOX2 = 1350MHz for MAX2684, PLO = -5dBm, all input/output ports terminated in 50, IFOUT+ and IFOUT- matched to single-ended 50 load, TA = +25C, unless otherwise noted.)
MAX2684
SUPPLY CURRENT vs. SUPPLY VOLTAGE (ENX2 = GND)
MAX2683/4 toc28
SUPPLY CURRENT vs. SUPPLY VOLTAGE (ENX2 = VCC)
MAX2683/4 toc29
SUPPLY CURRENT vs. RBIAS
65 60 SUPPLY CURRENT (mA) 55 50 45 40 35 30 VCC = +3.3V ENX2 = VCC 800 1000 1200 1400 RBIAS () 1600 1800 2000 VCC = +5V VCC = +3.3V VCC = +5V ENX2 = GND
MAX2683/4 toc30
100 90 80 SUPPLY CURRENT (mA) 70 60 50 40 30 20 10 0 2.5 3.0 3.5 4.0 4.5 5.0 RBIAS = 2.0k RBIAS = 1.2k RBIAS = 820 TA = +25C TA = +85C
100 90 80 SUPPLY CURRENT (mA) 70 60 50 40 30 20 10 0 RBIAS = 2.0k TA = -40C 2.5 3.0 3.5 4.0 4.5 5.0 RBIAS = 820 RBIAS = 1.2k TA = +85C TA = +25C
70
TA = -40C
25 20 5.5
5.5
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
CONVERSION GAIN vs. RBIAS
MAX2683/4 toc31
INPUT IP3 vs. RBIAS
MAX2683/4 toc32
INPUT P1dB vs. RBIAS
VCC = +5V 2 INPUT P1dB (dBm) 1 0 -1 -2 -3 -4 VCC = +3.3V
MAX2683/4 toc33
1.4 VCC = +5V 1.2 CONVERSION GAIN (dB) 1.0 0.8 0.6 0.4 0.2 0 -0.2 800 1000 1200 1400 RBIAS() 1600 1800 VCC = +3.3V
13 VCC = +5V 12 INPUT IP3 (dBm) 11 10 9 8 7 6 VCC = +3.3V
3
2000
800
1000
1200
1400 RBIAS ()
1600
1800
2000
800
1000
1200
1400 RBIAS ()
1600
1800
2000
CONVERSION GAIN vs. LO POWER (ENX2 = GND)
MAX2683 toc34
CONVERSION GAIN vs. LO POWER (ENX2 = VCC)
MAX2683 toc35
NOISE FIGURE vs. LO POWER
19 18 NOISE FIGURE (dB) 17 16 15 14 13 12 11 10
MAX2683 toc36
5 4 3 CONVERSION GAIN (dB) 2 1 0 -1 -2 -3 -4 -5 -20 -15 -10 LO POWER (dBm) -5 0 TA = +85C TA = -40C TA = +25C
5 4 3 CONVERSION GAIN (dB) 2 1 0 -1 -2 -3 -4 -5 -20 -15 -10 LO POWER (dBm) -5 0 TA = +85C TA = +25C TA = -40C
20
-16
-14
-12
-10
-8
-6
-4
-2
0
LO POWER (dBm)
8
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3.5GHz Downconverter Mixers with Selectable LO Doubler
Typical Operating Characteristics (continued)
(MAX2683/MAX2684 EV kit, VCC = +5V, RBIAS = 1.2k, ENX2 = GND, fRF = 3.6GHz, PRF = -20dBm, fLOX2 = 1650MHz for MAX2683 or fLOX2 = 1350MHz for MAX2684, PLO = -5dBm, all input/output ports terminated in 50, IFOUT+ and IFOUT- matched to single-ended 50 load, TA = +25C, unless otherwise noted.)
MAX2683/MAX2684
MAX2684
CONVERSION GAIN vs. SUPPLY VOLTAGE (RBIAS = 820)
MAX2683 toc37
CONVERSION GAIN vs SUPPLY VOLTAGE (RBIAS = 1.2k)
MAX2683 toc38
CONVERSION GAIN vs. SUPPLY VOLTAGE (RBIAS = 2k)
4 3 CONVERSION GAIN (dB) 2 1 0 -1 -2 -3 TA = +25C TA = +85C TA = -40C
MAX2683 toc39
5 4 3 CONVERSION GAIN (dB) 2 1 0 -1 -2 -3 -4 -5 2.5 3.0 3.5 4.0 4.5 5.0 TA = +25C TA = +85C TA = -40C
3 2 CONVERSION GAIN (dB) 1 0 TA = +25C -1 -2 -3 TA = +85C
5
TA = -40C
ENX2 = VCC ENX2 = GND 2.5 3.0 3.5 4.0 4.5 5.0 5.5
-4 -5 2.5 3.0 3.5 4.0 4.5 5.0 5.5
5.5
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
INPUT IP3 vs. SUPPLY VOLTAGE (RBIAS = 820)
TA = +85C
MAX2683 toc40
INPUT IP3 vs. SUPPLY VOLTAGE (RBIAS = 1.2k)
MAX2683 toc41
INPUT IP3 vs. SUPPLY VOLTAGE (RBIAS = 2k)
9 8 INPUT IP3 (dBm) 7 6 5 4 3 2 1 0 TA = +25C TA = -40C TA = -+85C
MAX2683 toc42
15
15 14 13 INPUT IP3 (dBm) 12 11 10 9 8 TA = +25C TA = +85C TA = -40C
10
12 TA = +25C INPUT IP3 (dBm) 9 TA = -40C
6
3
7 6
0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 SUPPLY VOLTAGE (V)
5 2.5 3.0 3.5 4.0 4.5 5.0 5.5 SUPPLY VOLTAGE (V)
2.5
3.0
3.5
4.0
4.5
5.0
5.5
SUPPLY VOLTAGE (V)
INPUT P1dB vs. SUPPLY VOLTAGE (RBIAS = 820)
MAX2683 toc43
INPUT P1dB vs. SUPPLY VOLTAGE (RBIAS = 1.2k)
MAX2683 toc44
INPUT P1dB vs. SUPPLY VOLTAGE (RBIAS = 2k)
-1 -2 INPUT P1dB (dBm) -3 -4 -5 -6 -7 -8 -9 -10 TA = +25C TA = -40C TA = +85C
MAX2683 toc45
10
5 4 3 INPUT P1dB (dBm) 2 1 0 -1 -2 -3 -4 TA = +25C TA = +85C TA = -40C
0
6 INPUT P1dB (dBm) TA = +25C TA = -40C TA = +85C -6
2
-2
-10 2.5 3.0 3.5 4.0 4.5 5.0 5.5 SUPPLY VOLTAGE (V)
-5 2.5 3.0 3.5 4.0 4.5 5.0 5.5 SUPPLY VOLTAGE (V)
2.5
3.0
3.5
4.0
4.5
5.0
5.5
SUPPLY VOLTAGE (V)
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9
3.5GHz Downconverter Mixers with Selectable LO Doubler MAX2683/MAX2684
Typical Operating Characteristics (continued)
(MAX2683/MAX2684 EV kit, VCC = +5V, RBIAS = 1.2k, ENX2 = GND, fRF = 3.6GHz, PRF = -20dBm, fLOX2 = 1650MHz for MAX2683 or fLOX2 = 1350MHz for MAX2684, PLO = -5dBm, all input/output ports terminated in 50, IFOUT+ and IFOUT- matched to single-ended 50 load, TA = +25C, unless otherwise noted.)
MAX2684
CONVERSION GAIN vs. RF FREQUENCY (ENX2 = GND)
MAX2683 toc46
CONVERSION GAIN vs. RF FREQUENCY (ENX2 = VCC)
MAX2683 toc47
CONVERSION GAIN vs. IF FREQUENCY (ENX2 = GND)
4 3 CONVERSION GAIN (dB) 2 1 0 -1 -2 -3 -4 -5 TA = +85C TA = -40C TA = +25C
MAX2683 toc48
5 4 3 CONVERSION GAIN (dB) 2 1 0 -1 -2 -3 -4 -5 TA = +85C TA = -40C TA = +25C
5 4 3 CONVERSION GAIN (dB) 2 1 0 -1 -2 -3 -4 -5 TA = +85C TA = -40C TA = +25C
5
3400 3450 3500 3550 3600 3650 3700 3750 3800 RF FREQUENCY (MHz)
3400 3450 3500 3550 3600 3650 3700 3750 3800 RF FREQUENCY (MHz)
860
880
900
920
940
960
IF FREQUENCY (MHz)
CONVERSION GAIN vs. IF FREQUENCY (ENX2 = VCC)
4 3 CONVERSION GAIN (dB) 2 1 0 -1 -2 -3 -4 -5 860 880 900 920 940 960 IF FREQUENCY (MHz) -50 1200 -40 TA = +85C TA = -40C TA = +25C
MAX2683 toc49
LOX2 PORT RETURN LOSS vs. LO FREQUENCY
MAX2683 toc50
LOX1 PORT RETURN LOSS vs. LO FREQUENCY
MAX2683 toc51
5
0
0
-10 RETURN LOSS (dB)
-10 RETURN LOSS (dB)
-20
-20
-30
-30
-40
-50 1250 1300 1350 1400 1450 2400 2500 2600 2700 2800 2900 LO FREQUENCY (MHz) LO FREQUENCY (MHz)
LOX1 S11 vs. RBIAS (ENX2 = VCC)
LOX2 S11 vs. RBIAS (ENX2 = GND)
1.2k, 2k, 820
1.2k, 2k, 820
10
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3.5GHz Downconverter Mixers with Selectable LO Doubler MAX2683/MAX2684
Typical Operating Characteristics (continued)
(MAX2683/MAX2684 EV kit, VCC = +5V, RBIAS = 1.2k, ENX2 = GND, fRF = 3.6GHz, PRF = -20dBm, fLOX2 = 1650MHz for MAX2683 or fLOX2 = 1350MHz for MAX2684, PLO = -5dBm, all input/output ports terminated in 50, IFOUT+ and IFOUT- matched to single-ended 50 load, TA = +25C, unless otherwise noted.)
MAX2684
IF PORT S11 vs. RBIAS
RFIN S11 vs. RBIAS
1.2k, 2k, 820k
2k, 1.2k, 820k
Pin Description
PIN NAME VCC GND FUNCTION Supply Voltage Input. Bypass with a 100pF capacitor as close to the pin as possible. Ground. Connect to ground plane with a low-inductance connection. Solder exposed paddle evenly to the board ground plane. RF Input Port to Mixer. Requires a matching network and a DC-blocking capacitor that may be part of this network. LO Frequency-Doubler Enable Input. Drive low to enable the LO doubler and run external LO at half frequency. Drive high to disable the LO doubler and run external LO at full frequency. Half-Frequency Local-Oscillator Input to LO Frequency Doubler, LO Filter, and Downconverter Mixer. Requires a DC-blocking capacitor. Leave unconnected if this pin is not used. Full-Frequency Local-Oscillator Input to Downconverter Mixer. Requires a DC-blocking capacitor. Leave unconnected if this pin is not used. Differential, Open-Collector IF Output Ports of Mixer. Requires a matching network and pull-up inductors to VCC that can be part of this network. Bias-Setting Resistor Connection. A resistor, RBIAS, placed from BIAS to GND sets the linearity and supply current of the mixer.
1
2, 3, 5, 9, 10, 12, 13, 15, EP 4 6 7 8 11, 14 16
RFIN ENX2 LOX2 LOX1 IFOUT-, IFOUT+ BIAS
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3.5GHz Downconverter Mixers with Selectable LO Doubler MAX2683/MAX2684
Table 1. MAX2683/MAX2684 RFIN Port S-Parameters (VCC = +5V, TA = +25C)
RF FREQUENCY (MHz) RBIAS = 820 S11 MAG S11 PHASE (degrees) RBIAS = 1.2k S11 MAG MAX2683 3400 3450 3500 3550 3600 3650 3700 3750 3800 0.582 0.586 0.590 0.594 0.599 0.602 0.607 0.608 0.612 -113.3 -114.8 -116.2 -117.5 -118.7 -120.0 -121.2 -122.3 -123.5 0.561 0.564 0.567 0.570 0.574 0.576 0.580 0.583 0.587 MAX2684 3400 3450 3500 3550 3600 3650 3700 3750 3800 0.578 0.582 0.586 0.590 0.595 0.599 0.604 0.606 0.611 -117.5 -119.0 -120.5 -121.8 -123.1 -124.5 -125.7 -126.7 -127.9 0.537 0.542 0.545 0.545 0.555 0.558 0.564 0.568 0.572 -119.7 -121.2 -122.6 -122.7 -125.4 -126.7 -127.8 -128.9 -129.9 0.512 0.518 0.523 0.527 0.533 0.537 0.542 0.546 0.552 -121.3 -122.7 -124.1 -125.5 -126.8 -128.0 -129.1 -130.2 -13.1 -121.3 -122.5 -123.7 -125.1 -126.1 -127.2 -128.3 -129.3 -130.2 0.536 0.540 0.544 0.547 0.553 0.555 0.559 0.563 0.567 -122.3 -123.5 -124.7 -126.0 -127.0 -128.1 -129.1 -130.1 -131.0 S11 PHASE (degrees) RBIAS = 2k S11 MAG S11 PHASE (degrees)
Detailed Description
The MAX2683/MAX2684 are double-balanced downconverter mixers optimized for the 3.4GHz to 3.8GHz frequency band. The MAX2683 is designed for downconversion to IF frequencies of 100MHz to 400MHz, while the MAX2684 is designed for IF frequencies of 800MHz to 1000MHz. In addition, the devices include a logic-level LO frequency doubler, an integrated LO filter, and externally programmable bias control circuitry.
network and a DC-blocking capacitor that may be part of this network. See Typical Operation Circuit for recommended component values. See Table 1 for RFIN port S-parameters.
LO Inputs, LO Frequency Doubler, and LO Filter
The MAX2683/MAX2684 feature an internal LO frequency doubler that allows the external LO to run at full or half frequency. Running the LO at half frequency has the benefit of reducing unwanted LO leakage through the low-noise amplifier (LNA) to the antenna, reducing injection pulling of the voltage-controlled oscillator
RF Input
RFIN is a single-ended input that accepts frequencies in the 3.4GHz to 3.8GHz range. It requires a matching
12
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3.5GHz Downconverter Mixers with Selectable LO Doubler MAX2683/MAX2684
Table 2. MAX2683 LO Port S-Parameters (VCC = +5V, TA = +25C)
LOX2 (ENX2 = GND) LOX2 FREQUENCY (MHz) S11 MAG S11 PHASE (degrees) LOX2 FREQUENCY (MHz) LOX1 (ENX2 = VCC) S11 MAG S11 PHASE (degrees)
RBIAS = 820 1500 1575 1650 1725 1800 1875 1950 0.234 0.237 0.241 0.247 0.254 0.262 0.268 -82.0 -86.7 -91.1 -95.3 -98.9 -102.3 -104.9 RBIAS = 1.2k 1500 1575 1650 1725 1800 1875 1950 0.211 0.213 0.217 0.222 0.230 0.240 0.249 -77.9 -83.7 -89.3 -94.5 -99.3 -103.6 -107.1 RBIAS = 2.0k 1500 1575 1650 1725 1800 1875 1950 0.213 0.214 0.218 0.223 0.231 0.241 0.249 -78.0 -83.7 -89.3 -94.5 -99.3 -103.7 -107.2 3000 3150 3300 3450 3600 3750 3900 0.339 0.340 0.332 0.315 0.294 0.268 0.240 -155.2 -156.0 -156.0 -155.3 -153.3 -150.0 -145.5 3000 3150 3300 3450 3600 3750 3900 0.343 0.341 0.330 0.310 0.285 0.256 0.224 -159.1 -160.0 -162.3 -162.0 -160.2 -156.4 -151.1 3000 3150 3300 3450 3600 3750 3900 0.362 0.358 0.338 0.306 0.271 0.235 0.200 -163.5 -165.4 -167.0 -167.3 -164.9 -160.6 -154.8
(VCO) from the PA, and reducing the demands of designing a high-frequency VCO. An internal LO bandpass filter is integrated after the frequency doubler to help reduce LO harmonic content and spurious mixing.
To enable the LO frequency doubler, drive ENX2 to a logic-low level and connect the half-frequency external LO to the LOX2 port. To disable and bypass the LO frequency doubler and LO filter, drive ENX2 to a logichigh level and connect the full-frequency external LO to
13
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3.5GHz Downconverter Mixers with Selectable LO Doubler MAX2683/MAX2684
Table 3. MAX2684 LO Port S-Parameters (VCC = +5V, TA = +25C)
LOX2 (ENX2 = GND) LOX2 FREQUENCY (MHz) S11 MAG S11 PHASE (degrees) LOX1 FREQUENCY (MHz) LOX1 (ENX2 = VCC) S11 MAG S11 PHASE (degrees)
RBIAS = 820 1200 1250 1300 1350 1400 1450 0.225 0.219 0.215 0.212 0.210 0.209 -59.6 -62.8 -66.0 -69.1 -72.4 -75.4 RBIAS = 1.2k 1200 1250 1300 1350 1400 1450 0.228 0.222 0.219 0.216 0.214 0.213 -64.7 -68.9 -71.2 -74.4 -77.8 -81.0 RBIAS = 2.0k 1200 1250 1300 1350 1400 1450 0.212 0.222 0.217 0.213 0.211 0.209 -75.4 -63.1 -66.2 -69.2 -72.3 -75.3 2400 2500 2600 2700 2800 2900 0.224 0.240 0.255 0.269 0.279 0.283 -132.3 -136.6 -140.1 -143.8 -147.6 -150.3 2400 2500 2600 2700 2800 2900 0.235 0.251 0.265 0.280 0.290 0.292 -135.3 -139.8 -143.5 -147.8 -152.8 -157.0 2400 2500 2600 2700 2800 2900 0.249 0.266 0.281 0.296 0.305 0.302 -138.9 -143.5 -147.5 -152.1 -158.8 -167.3
the LOX1 port. Disabling the LO doubler has the benefit of reducing the supply current by 15mA. See Tables 2 and 3 for the LO input frequency ranges. LOX1 and LOX2 are single-ended LO inputs that achieve a return loss of typically -20dB over the specified LO input frequency range. They are internally biased and require a DC-blocking capacitor. To improve LOX2 input return loss, use a series inductor between the blocking capacitor and LOX2 input. See
14
the Typical Operating Circuit for recommended component values. See Tables 2 and 3 for LOX1 and LOX2 S-parameters. Leave the unused port unconnected.
IF Output
The MAX2683 is optimized for IF frequencies in the 100MHz to 400MHz range, while the MAX2684 is optimized for IF frequencies in the 900MHz to 1000MHz range. The differential, open-collector IFOUT- and IFOUT+ ports require external pull-up inductors to VCC,
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3.5GHz Downconverter Mixers with Selectable LO Doubler MAX2683/MAX2684
Table 4. MAX2683 IFOUT Port S-Parameters (VCC = +5V, TA = +25C)
RF FREQUENCY (MHz) 150 200 250 300 350 RBIAS = 820 S11 MAG 0.915 0.907 0.904 0.899 0.894 S11 PHASE (degrees) -11.3 -14.8 -17.7 -21.3 -24.5 RBIAS = 1.2k S11 MAG 0.914 0.905 0.905 0.900 0.893 S11 PHASE (degrees) -11.2 -14.7 -17.8 -21.3 -24.5 RBIAS = 1.2k S11 MAG 0.930 0.920 0.917 0.911 0.907 S11 PHASE (degrees) -10.9 -14.2 -17.2 -20.3 -23.5
Table 5. MAX2684 IFOUT Port S-Parameters (VCC = +5V, TA = +25C)
RF FREQUENCY (MHz) 860 880 900 920 940 960 RBIAS = 820 S11 MAG 0.955 0.952 0.950 0.946 0.943 0.941 S11 PHASE (degrees) -49.4 -50.3 -51.1 -52.0 -53.0 -53.6 RBIAS = 1.2k S11 MAG 0.955 0.952 0.948 0.944 0.940 0.936 S11 PHASE (degrees) -49.6 -50.5 -51.4 -52.3 -53.1 -54.0 RBIAS = 1.2k S11 MAG 0.955 0.950 0.946 0.941 0.937 0.935 S11 PHASE (degrees) -49.7 -50.6 -51.4 -52.3 -53.3 -53.8
as well as an output matching network for optimum performance. See Typical Operating Circuit for recommended component values. See Tables 4 and 5 for IFOUT port S-parameters.
___________Applications Information
Layout Considerations
A properly designed PC board is an essential part of any RF/microwave circuit. Keep RF signal lines as short as possible to reduce losses, radiation, and inductance. Use separate, low-inductance vias to the ground plane for each ground pin. For best performance, solder the exposed pad on the bottom of the device package evenly to the board ground plane.
Bias Circuitry
The linearity and supply current of the MAX2683/ MAX2684 are externally programmable with a single resistor, RBIAS, from BIAS to GND. A nominal resistor value of 1.2k will set an IIP3 of +9dBm and a supply current of 55mA. Decreasing the resistor value improves linearity at the cost of increased supply current. Increasing the resistor value decreases supply current while degrading linearity. Use resistor values in the range of 820k to 2k.
Power-Supply and ENX2 Bypassing
Proper voltage-supply bypassing is essential for highfrequency circuit stability. Bypass V CC with a 10F capacitor in parallel with a 100pF capacitor located as close to the VCC pin as possible. Bypass ENX2 with a 100pF capacitor to ground to minimize noise injected into the LO doubler cell. Use a series resistor (typically 1.2k) to further reduce coupling of high-frequency signals into the ENX2 pin.
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15
3.5GHz Downconverter Mixers with Selectable LO Doubler MAX2683/MAX2684
Typical Operating Circuit
VCC 1 10F 100pF 2 3 3300pF RF INPUT 1pF 1.2k 100pF 100pF HALF-FREQUENCY LO INPUT FULL-FREQUENCY LO INPUT 3.9nH 100pF 8 LOX1 IFOUTLOX2 GND GND 11 10 9 8.2pF 16 RBIAS 1.5k GND 15 8.2pF IFOUT+ GND 14 13 39nH LO DOUBLER OFF ENABLE ON 6 ENX2 GND 12 1.5k 39nH 7 VCC 3.3pF 0.01F BALUN 300MHz IF OUTPUT
VCC GND GND
BIAS
1.2nH
4 5
RFIN GND
MAX2683
NOTE: EVENLY SOLDER EXPOSED PAD (EP) ON BOTTOM OF DEVICE TO GROUND PLANE. IFOUT+ GND 14 13 6.8nH GND 12 300
8.2pF 900MHz IF OUTPUT VCC
0.01F 6.8nH IFOUT11 8.2pF MAX2684 IF OUTPUT DIFFERENTIAL TO SINGLE-ENDED CONVERSION NETWORK. BALUN
16
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3.5GHz Downconverter Mixers with Selectable LO Doubler
Package Information
TSSOP.EPS
MAX2683/MAX2684
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17
3.5GHz Downconverter Mixers with Selectable LO Doubler MAX2683/MAX2684
NOTES
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
18 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2000 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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