MAXIM MAX2683EUE

19-1620; Rev 0; 1/00
NUAL
KIT MA
ATION
U
EET
L
H
A
S
V
E
S DATA
W
O
L
L
FO
3.5GHz Downconverter Mixers
with Selectable LO Doubler
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
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
Ordering Information
TEMP. RANGE
PIN-PACKAGE
MAX2683EUE
PART
-40°C to +85°C
16 TSSOP-EP*
MAX2684EUE
-40°C to +85°C
16 TSSOP-EP*
*Exposed pad
Wireless Local Loop (WLL)
Digital Microwave Radio (DMR)
Typical Operating Circuit appears at end of data sheet.
Wireless Broadband Access
Pin Configuration
Functional Diagram
TOP VIEW
IFOUT+
RFIN
IFOUT-
VCC
BIAS
VCC 1
16 BIAS
GND 2
15 GND
GND 3
BIAS
RFIN 4
GND
LO
BUFFER
GND 5
x1
MAX2683
MAX2684
LOX1
LO
DOUBLER x2
LOX2
ENX2
14 IFOUT+
MAX2683
MAX2684
13 GND
12 GND
ENX2 6
11 IFOUT-
LOX2 7
10 GND
LOX1 8
9
GND
TSSOP-EP
________________________________________________________________ Maxim Integrated Products
1
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.
MAX2683/MAX2684
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.
MAX2683/MAX2684
3.5GHz Downconverter Mixers
with Selectable LO Doubler
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 (50Ω source) .....................................+10dBm
LO Input Power (50Ω source) ........................................+10dBm
RBIAS .............................................................................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
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 = 1.2kΩ; ENX2 = GND; RFIN, LOX1, and LOX2 are terminated in 50Ω, no input signal applied; IFOUT+
= IFOUT- = VCC, TA = -40°C to +85°C, unless otherwise noted. Typical values are at VCC = +5V, TA = +25°C.) (Note 1)
PARAMETER
CONDITIONS
MIN
Supply Current
Supply Current Reduction when
LO Doubler is Disabled
ENX2 = VCC
TYP
MAX
UNITS
55
66
mA
15
mA
2.0
Input Logic Voltage High
V
Input Logic Voltage Low
-20
Input Logic Bias Current
0.6
V
10
µA
AC ELECTRICAL CHARACTERISTICS—MAX2683
(MAX2683/MAX2684 EV kit, VCC = +5V, RBIAS = 1.2kΩ, ENX2 = GND, fRF = 3.6GHz, PRF = -20dBm, fLOX2 = 1650MHz, PLO = -5dBm,
all input/output ports terminated in 50Ω, IFOUT+ and IFOUT- matched to single-ended 50Ω load, TA = +25°C, unless otherwise noted.)
PARAMETER
CONDITIONS
MIN
MAX
UNITS
3.8
GHz
100
400
MHz
1.5
1.95
GHz
ENX2 = VCC (Notes 2, 3)
3.0
3.9
GHz
Conversion Gain
(Notes 1, 4)
4.8
6.7
8.0
dB
Gain Variation Over
Temperature
TA = -40°C to +85°C (Note 2)
±0.5
±1.2
dB
RF Frequency Range
(Notes 2, 3)
3.4
IF Frequency Range
(Notes 2, 3)
LOX2 Frequency Range
ENX2 = GND (Notes 2, 3)
LOX1 Frequency Range
TYP
Input 1dB Compression Point
+0.8
dBm
Input Third-Order Intercept Point (Note 5)
+8.8
dBm
Input Second-Order Intercept
Point
(Note 6)
+33
dBm
Noise Figure
RFIN Input Return Loss
(Note 7)
(Note 8)
dB
dB
fRFIN = 1 × fLO
12
-18
-42
fRFIN = 2 × fLO
-38
dBm
fRFIN = 3 × fLO
-49
ENX2 = VCC, fRFIN = 1 × fLO, fLOX1 = 3.3GHz
-39
LOX2 Leakage at RFIN
LOX1 Leakage at RFIN
2
ENX2 = GND
_______________________________________________________________________________________
dBm
3.5GHz Downconverter Mixers
with Selectable LO Doubler
(MAX2683/MAX2684 EV kit, VCC = +5V, RBIAS = 1.2kΩ, ENX2 = GND, fRF = 3.6GHz, PRF = -20dBm, fLOX2 = 1650MHz, PLO = -5dBm,
all input/output ports terminated in 50Ω, IFOUT+ and IFOUT- matched to single-ended 50Ω load, TA = +25°C, unless otherwise noted.)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
fIFOUT = 1 × fLO
-39
fIFOUT = 2 × fLO
fIFOUT = 3 × fLO
-39
-64
dBm
LOX1 Leakage at IFOUT+,
IFOUT-
ENX2 = VCC, fIFOUT = 1 × fLO, fLOX1 = 3.3GHz
-39
dBm
LOX1, LOX2 Input Return Loss
(Note 9)
-20
dB
LOX2 Leakage at IFOUT+,
IFOUT-
ENX2 = GND
AC ELECTRICAL CHARACTERISTICS—MAX2684
(MAX2683/MAX2684 EV kit, VCC = +5V, RBIAS = 1.2kΩ, ENX2 = GND, fRF = 3.6GHz, PRF = -20dBm, fLOX2 = 1350MHz, PLO = -5dBm,
all input/output ports terminated in 50Ω, IFOUT+ and IFOUT- matched to single-ended 50Ω load, TA = +25°C, unless otherwise noted.)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
RF Frequency Range
(Notes 2, 3)
3.4
3.8
GHz
IF Frequency Range
(Notes 2, 3)
800
1000
MHz
LOX2 Frequency Range
LOX2 = GND (Notes 2, 3)
1.2
1.45
GHz
LOX1 Frequency Range
LOX2 = VCC (Notes 2, 3)
2.4
Conversion Gain
(Notes 1, 4)
0.8
Gain Variation Over
Temperature and Frequency
TA = -40°C to +85°C
Input 1dB Compression Point
2.9
GHz
+1
+2.3
dB
±0.5
±1.2
dB
0
dBm
Input Third-Order Intercept Point (Note 10)
+9.5
dBm
Input Second-Order Intercept
Point
(Note 11)
+37
dBm
Noise Figure
RFIN Input Return Loss
(Note 7)
(Note 8)
dB
dB
LOX2 Leakage at RFIN
ENX2 = GND
fRFIN = 1 × fLOX2
fRFIN = 2 × fLOX2
fRFIN = 3 × fLOX2
13.6
-18
-47
-43
-49
LOX1 Leakage at RFIN
ENX2 = VCC, fRFIN = 1 × fLOX1, fLOX1 = 2.7GHz
-45
dBm
fRFIN = 1 × fLOX2
fRFIN = 2 × fLOX2
fRFIN = 3 × fLOX2
-37
-20
-41
dBm
dBm
LOX2 Leakage at IFOUT+,
IFOUT-
ENX2 = GND
LOX1 Leakage at IFOUT+,
IFOUT-
ENX2 = VCC, fIFOUT = 1 × fLOX1, fLOX1 = 2.7GHz
-15
dBm
LOX1, LOX2 Input Return Loss
(Note 9)
-20
dB
Note 1: Devices are production tested at TA = +25°C.
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.
_______________________________________________________________________________________
3
MAX2683/MAX2684
AC ELECTRICAL CHARACTERISTICS—MAX2683 (continued)
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 = 1.2kΩ, ENX2 = GND, fRF = 3.6GHz, PRF = -20dBm, fLOX2 = 1650MHz for MAX2683 or
fLOX2 = 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
70
RBIAS = 820Ω
60
RBIAS = 1.2kΩ
40
RBIAS = 2.0kΩ
TA = -40°C
20
70
TA = +85°C
RBIAS = 820Ω
40
RBIAS = 1.2kΩ
30
20
10
3.0
3.5
4.0
4.5
5.0
5.5
3.0
SUPPLY VOLTAGE (V)
CONVERSION GAIN vs. RBIAS
4.5
5.0
6.0
5.0
1400
RBIAS (Ω)
1600
10
9
8
VCC = +3.3V
7
1800
2000
MAX2683/4 toc03
ENX2 = VCC
800
1000
1200
1400
1600
1800
2000
INPUT P1dB vs. RBIAS
3
2
VCC = +5V
1
0
VCC = +3.3V
-1
-2
-3
5
1200
VCC = +3.3V
20
5.5
6
1000
VCC = +3.3V
35
RBIAS (Ω)
VCC = +5V
INPUT IP3 (dBm)
VCC = +5V
800
VCC = +5V
40
INPUT IP3 vs. RBIAS
5.5
4
4.0
11
MAX2683 toc04
VCC = +3.3V
6.5
45
SUPPLY VOLTAGE (V)
7.5
7.0
3.5
VCC = +5V
50
25
TA = -40°C
2.5
ENX2 = GND
55
30
0
2.5
60
RBIAS = 2.0kΩ
10
0
TA = +25°C
60
50
65
INPUT P1dB (dBm)
30
80
MAX2683/4 toc05
50
90
SUPPLY CURRENT (mA)
TA = +85°C
TA = +25°C
SUPPLY CURRENT (mA)
SUPPLY CURRENT (mA)
80
SUPPLY CURRENT vs. RBIAS
70
MAX2683/4 toc02
90
100
MAX2683/4 toc01
100
SUPPLY CURRENT vs. SUPPLY VOLTAGE
(ENX2 = VCC)
MAX2683 toc06
SUPPLY CURRENT vs. SUPPLY VOLTAGE
(ENX2 = GND)
CONVERSION GAIN (dB)
MAX2683/MAX2684
3.5GHz Downconverter Mixers
with Selectable LO Doubler
800
1000
1200
1400
RBIAS (Ω)
1600
1800
2000
800
1000
1200
1400
RBIAS (Ω)
_______________________________________________________________________________________
1600
1800
2000
3.5GHz Downconverter Mixers
with Selectable LO Doubler
MAX2683
CONVERSION GAIN vs. LO POWER
(ENX2 = VCC)
TA = +25°C
0
-2
TA = +85°C
-4
0
-2
TA = +85°C
-4
-6
-8
-8
-15
-10
-5
0
20
15
10
5
0
-10
-20
-20
-15
-10
-5
-16
0
-14
-12
-10
-8
-6
-4
-2
0
LO POWER (dBm)
LO POWER (dBm)
LO POWER (dBm)
CONVERSION GAIN vs. SUPPLY VOLTAGE
(RBIAS = 820Ω)
CONVERSION GAIN vs. SUPPLY VOLTAGE
(RBIAS = 1.2kΩ)
CONVERSION GAIN vs. SUPPLY VOLTAGE
(RBIAS = 2kΩ)
TA = +25°C
TA = +85°C
4
3
7
6
5
3
2
2
1
1
0
0
3.0
3.5
4.0
4.5
5.0
5.5
MAX2683 toc12
TA = -40°C
6
5
TA = +25°C
4
TA = +85°C
3
1
0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
2.5
3.0
3.5
4.0
4.5
5.0
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
INPUT IP3 vs. SUPPLY VOLTAGE
(RBIAS = 820Ω)
INPUT IP3 vs. SUPPLY VOLTAGE
(RBIAS = 1.2kΩ)
INPUT IP3 vs. SUPPLY VOLTAGE
(RBIAS = 2kΩ)
9
INPUT IP3 (dBm)
12
TA = +85°C
TA = +25°C
TA = -40°C
6
10
9
TA = +25°C
8
7
5.5
MAX2683 toc15
10
MAX2683 toc13
15
9
7
2
ENX2 = VCC
ENX2 = GND
INPUT IP3 (dBm)
2.5
TA = +25°C
TA = +85°C
4
8
MAX2683 toc14
5
9
CONVERSION GAIN (dB)
7
6
8
CONVERSION GAIN (dB)
8
TA = -40°C
9
10
MAX2683 toc11
TA = -40°C
9
10
MAX2683 toc10
10
CONVERSION GAIN (dB)
TA = +25°C
2
-6
-10
INPUT IP3 (dBm)
4
25
NOSIE FIGURE (dB)
4
2
6
CONVERSION GAIN (dB)
CONVERSION GAIN (dB)
6
TA = -40°C
8
30
MAX2683 toc08
TA = -40°C
8
NOISE FIGURE vs. LO POWER
10
MAX2683 toc07
10
MAX2683 toc09
CONVERSION GAIN vs. LO POWER
(ENX2 = GND)
8
TA = +85°C
7
TA = -40°C
TA = -40°C
TA = +85°C
3
6
6
5
5
TA = +25°C
0
2.5
3.0
3.5
4.0
4.5
SUPPLY VOLTAGE (V)
5.0
5.5
2.5
3.0
3.5
4.0
4.5
SUPPLY VOLTAGE (V)
5.0
5.5
2.5
3.0
3.5
4.0
4.5
5.0
5.5
SUPPLY VOLTAGE (V)
_______________________________________________________________________________________
5
MAX2683/MAX2684
Typical Operating Characteristics (continued)
(MAX2683/MAX2684 EV kit, VCC = +5V, RBIAS = 1.2kΩ, ENX2 = GND, fRF = 3.6GHz, PRF = -20dBm, fLOX2 = 1650MHz for MAX2683 or
fLOX2 = 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.)
Typical Operating Characteristics (continued)
(MAX2683/MAX2684 EV kit, VCC = +5V, RBIAS = 1.2kΩ, ENX2 = GND, fRF = 3.6GHz, PRF = -20dBm, fLOX2 = 1650MHz for MAX2683 or
fLOX2 = 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
(RBIAS = 820Ω)
INPUT P1dB vs. SUPPLY VOLTAGE
(RBIAS = 1.2kΩ)
INPUT P1dB (dBm)
INPUT P1dB (dBm)
2
TA = -40°C
-2
1
TA = +25°C
0
TA = -40°C
MAX2683 toc18
TA = +85°C
2
TA = +25°C
0
-1
INPUT P1dB (dBm)
6
INPUT P1dB vs. SUPPLY VOLTAGE
(RBIAS = 2kΩ)
MAX2683 toc17
3
MAX2683 toc16
10
TA = -40°C
-2
TA = +25°C
-3
TA = +85°C
TA = +85°C
-6
-1
-10
3.0
3.5
4.0
4.5
5.0
5.5
3.0
3.5
4.0
4.5
5.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
CONVERSION GAIN vs. RF FREQUENCY
(RBIAS = 1.2kΩ)
CONVERSION GAIN vs. FREQUENCY
(ENX2 = GND)
CONVERSION GAIN vs. IF FREQUENCY
(ENX2 = VCC)
6
5
TA = +85°C
TA = +25°C
3
2
7
6
5
TA = +25°C
4
TA = +85°C
3
2
ENX2 = VCC
ENX2 = GND
7
6
5
TA = +85°C
4
TA = +25°C
3
IF PORT NARROWBAND MATCH AT 300MHz
0
250
270
RF FREQUENCY (MHz)
290
310
330
350
250
270
IF FREQUENCY (MHz)
-40
-60
-80
MAX2683 toc23
0
-10
RETURN LOSS (dB)
-20
310
LOX1 PORT RETURN LOSS
vs. LO FREQUENCY (ENX2 = VCC)
MAX2683 toc22
0
290
IF FREQUENCY (MHz)
LOX2 PORT RETURN LOSS vs.
LO FREQUENCY (ENX2 = GND)
RETURN LOSS (dB)
TA = -40°C
8
1
IF PORT NARROWBAND MATCH AT 300MHz
0
3400 3450 3500 3550 3600 3650 3700 3750 3800
9
2
1
0
10
CONVERSION GAIN (dB)
7
8
CONVERSION GAIN (dB)
TA = -40°C
TA = -40°C
9
MAX2683 toc20
MAX2683 toc19
10
-20
-30
-40
-100
-50
1500
1600
1700
1800
LO FREQUENCY (MHz)
MAX2683 toc21
SUPPLY VOLTAGE (V)
8
6
5.5
SUPPLY VOLTAGE (V)
9
1
-5
2.5
SUPPLY VOLTAGE (V)
10
4
-4
-2
2.5
CONVERSION GAIN (dB)
MAX2683/MAX2684
3.5GHz Downconverter Mixers
with Selectable LO Doubler
1900
2000
3000
3180
3360
3540
3720
3900
LO FREQUENCY (MHz)
_______________________________________________________________________________________
330
350
3.5GHz Downconverter Mixers
with Selectable LO Doubler
LOX1 S11 vs. RBIAS
(ENX2 = VCC)
820Ω
MAX2683
LOX2 S11 vs. RBIAS
(ENX2 = GND)
1.2kΩ,
2kΩ, 820Ω
1.2kΩ
2kΩ
MAX2683
IF PORT S11 vs. RBIAS
1.2kΩ,
2kΩ, 820kΩ
MAX2683
RFIN S11 vs. RBIAS
2kΩ,
1.2kΩ, 820kΩ
_______________________________________________________________________________________
7
MAX2683/MAX2684
Typical Operating Characteristics (continued)
(MAX2683/MAX2684 EV kit, VCC = +5V, RBIAS = 1.2kΩ, ENX2 = GND, fRF = 3.6GHz, PRF = -20dBm, fLOX2 = 1650MHz for MAX2683 or
fLOX2 = 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.)
Typical Operating Characteristics (continued)
(MAX2683/MAX2684 EV kit, VCC = +5V, RBIAS = 1.2kΩ, ENX2 = GND, fRF = 3.6GHz, PRF = -20dBm, fLOX2 = 1650MHz for MAX2683 or
fLOX2 = 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.)
MAX2684
60
RBIAS = 1.2kΩ
40
30
RBIAS = 2.0kΩ
TA = -40°C
20
70
60
RBIAS = 820Ω
50
RBIAS = 1.2kΩ
40
30
20
10
4.0
4.5
5.0
5.5
2.5
3.0
SUPPLY VOLTAGE (V)
CONVERSION GAIN vs. RBIAS
4.5
5.0
VCC = +3.3V
0.6
0.4
10
9
0
7
800
VCC = +3.3V
2000
1000
1200
1400
1600
1800
CONVERSION GAIN vs. LO POWER
(ENX2 = VCC)
0
-1
TA = +85°C
-2
0
-1
VCC = +3.3V
TA = -40°C
TA = +25°C
1
0
TA = +85°C
-1
-2
16
15
14
13
12
11
-5
-5
LO POWER (dBm)
0
2000
17
-4
-5
1800
18
-4
-10
1600
19
-3
-15
1400
20
-3
-20
1200
NOISE FIGURE vs. LO POWER
3
2
1000
RBIAS (Ω)
MAX2683 toc35
4
CONVERSION GAIN (dB)
1
2000
1
800
2000
5
MAX2683 toc34
TA = +25°C
1800
-4
800
CONVERSION GAIN vs. LO POWER
(ENX2 = GND)
TA = -40°C
1600
-3
RBIAS (Ω)
4
1400
VCC = +5V
-2
RBIAS(Ω)
2
1200
2
NOISE FIGURE (dB)
1800
5
3
1000
3
6
1600
ENX2 = VCC
20
5.5
11
8
1400
VCC = +3.3V
INPUT P1dB vs. RBIAS
VCC = +5V
0.2
1200
VCC = +3.3V
35
RBIAS (Ω)
12
INPUT IP3 (dBm)
CONVERSION GAIN (dB)
1.0
1000
VCC = +5V
40
INPUT IP3 vs. RBIAS
-0.2
8
4.0
13
MAX2683/4 toc31
VCC = +5V
1.2
800
45
SUPPLY VOLTAGE (V)
1.4
0.8
3.5
INPUT P1dB (dBm)
3.5
VCC = +5V
50
25
TA = -40°C
MAX2683/4 toc32
3.0
ENX2 = GND
55
30
0
2.5
60
RBIAS = 2.0kΩ
10
0
TA = +25°C
TA = +85°C
65
MAX2683/4 toc33
50
80
MAX2683 toc36
RBIAS = 820Ω
70
90
SUPPLY CURRENT (mA)
SUPPLY CURRENT (mA)
TA = +25°C
SUPPLY CURRENT (mA)
TA = +85°C
80
SUPPLY CURRENT vs. RBIAS
70
MAX2683/4 toc29
90
100
MAX2683/4 toc28
100
SUPPLY CURRENT vs. SUPPLY VOLTAGE
(ENX2 = VCC)
MAX2683/4 toc30
SUPPLY CURRENT vs. SUPPLY VOLTAGE
(ENX2 = GND)
CONVERSION GAIN (dB)
MAX2683/MAX2684
3.5GHz Downconverter Mixers
with Selectable LO Doubler
10
-20
-15
-10
LO POWER (dBm)
-5
0
-16
-14
-12
-10
-8
-6
LO POWER (dBm)
_______________________________________________________________________________________
-4
-2
0
3.5GHz Downconverter Mixers
with Selectable LO Doubler
MAX2684
TA = +85°C
-2
-3
1
0
TA = +25°C
ENX2 = VCC
ENX2 = GND
3.5
4.0
4.5
5.0
3.0
3.5
INPUT IP3 vs. SUPPLY VOLTAGE
(RBIAS = 820Ω)
5.5
2.5
2.5
3.0
3.5
4.0
4.5
5.0
TA = +85°C
9
-2
-6
3.5
4.0
4.5
5.0
5.5
2.5
3.0
3.5
4.0
4.5
SUPPLY VOLTAGE (V)
5.0
5.5
2.5
3.0
3.5
4.0
4.5
5.0
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
INPUT P1dB vs. SUPPLY VOLTAGE
(RBIAS = 1.2kΩ)
INPUT P1dB vs. SUPPLY VOLTAGE
(RBIAS = 2kΩ)
0
MAX2683 toc44
3
2
TA = -40°C
TA = +85°C
1
0
-1
TA = +25°C
-1
TA = +85°C
-2
5.5
-3
-4
TA = +25°C
-5
TA = -40°C
-6
-7
-3
-10
TA = -40°C
4
0
3.0
-2
TA = +85°C
TA = +25°C
5
1
4
INPUT P1dB (dBm)
TA = -40°C
5.5
6
2
5
MAX2683 toc43
2
5.0
7
6
2.5
TA = +25°C
4.5
3
TA = +25°C
INPUT P1dB vs. SUPPLY VOLTAGE
(RBIAS = 820Ω)
6
4.0
TA = -+85°C
8
7
SUPPLY VOLTAGE (V)
10
3.5
9
TA = -40°C
11
5.5
3.0
10
5
0
TA = +85°C
INPUT IP3 vs. SUPPLY VOLTAGE
(RBIAS = 2kΩ)
8
3
-2
INPUT IP3 vs. SUPPLY VOLTAGE
(RBIAS = 1.2kΩ)
12
10
TA = +25°C
SUPPLY VOLTAGE (V)
13
INPUT IP3 (dBm)
TA = -40°C
6
5.0
14
TA = +25°C
9
4.5
MAX2683 toc41
12
4.0
15
MAX2683 toc40
TA = +85°C
0
-1
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
15
TA = -40°C
1
-5
2.5
5.5
INPUT IP3 (dBm)
3.0
2
-4
-3
2.5
MAX2683 toc39
3
-3
-2
-5
INPUT IP3 (dBm)
TA = +85°C
-1
-4
INPUT P1dB (dBm)
4
MAX2683 toc42
TA = +25°C
0
TA = -40°C
CONVERSION GAIN (dB)
1
5
INPUT P1dB (dBm)
CONVERSION GAIN (dB)
2
-1
2
CONVERSION GAIN (dB)
TA = -40°C
CONVERSION GAIN vs. SUPPLY VOLTAGE
(RBIAS = 2kΩ)
MAX2683 toc38
4
3
3
MAX2683 toc37
5
CONVERSION GAIN vs SUPPLY VOLTAGE
(RBIAS = 1.2kΩ)
MAX2683 toc45
CONVERSION GAIN vs. SUPPLY VOLTAGE
(RBIAS = 820Ω)
-8
-4
-9
-5
-10
2.5
3.0
3.5
4.0
4.5
SUPPLY VOLTAGE (V)
5.0
5.5
2.5
3.0
3.5
4.0
4.5
5.0
5.5
SUPPLY VOLTAGE (V)
_______________________________________________________________________________________
9
MAX2683/MAX2684
Typical Operating Characteristics (continued)
(MAX2683/MAX2684 EV kit, VCC = +5V, RBIAS = 1.2kΩ, ENX2 = GND, fRF = 3.6GHz, PRF = -20dBm, fLOX2 = 1650MHz for MAX2683 or
fLOX2 = 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.)
Typical Operating Characteristics (continued)
(MAX2683/MAX2684 EV kit, VCC = +5V, RBIAS = 1.2kΩ, ENX2 = GND, fRF = 3.6GHz, PRF = -20dBm, fLOX2 = 1650MHz for MAX2683 or
fLOX2 = 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.)
MAX2684
CONVERSION GAIN vs. RF FREQUENCY
(ENX2 = VCC)
TA = -40°C
2
TA = +25°C
1
0
-1
TA = +85°C
-2
TA = +25°C
2
1
0
-1
5
4
3
TA = +85°C
-2
TA = +25°C
TA = -40°C
2
1
0
TA = +85°C
-1
-2
-3
-3
-3
-4
-4
-4
-5
-5
-5
3400 3450 3500 3550 3600 3650 3700 3750 3800
3400 3450 3500 3550 3600 3650 3700 3750 3800
RF FREQUENCY (MHz)
RF FREQUENCY (MHz)
IF FREQUENCY (MHz)
CONVERSION GAIN vs. IF FREQUENCY
(ENX2 = VCC)
LOX2 PORT RETURN LOSS
vs. LO FREQUENCY
LOX1 PORT RETURN LOSS
vs. LO FREQUENCY
RETURN LOSS (dB)
2
1
0
TA = +85°C
-1
-20
-30
900
920
940
960
MAX2683 toc51
-10
880
0
-10
RETURN LOSS (dB)
TA = +25°C
TA = -40°C
3
0
860
MAX2683 toc50
4
MAX2683 toc49
5
MAX2683 toc48
TA = -40°C
3
CONVERSION GAIN (dB)
3
4
CONVERSION GAIN (dB)
4
CONVERSION GAIN (dB)
5
MAX2683 toc46
5
CONVERSION GAIN vs. IF FREQUENCY
(ENX2 = GND)
MAX2683 toc47
CONVERSION GAIN vs. RF FREQUENCY
(ENX2 = GND)
CONVERSION GAIN (dB)
MAX2683/MAX2684
3.5GHz Downconverter Mixers
with Selectable LO Doubler
-20
-30
-2
-40
-40
-3
-4
-50
-50
-5
860
880
900
920
940
960
1200
1300
1350
1400
2400
1450
LOX1 S11 vs. RBIAS
(ENX2 = VCC)
1.2kΩ, 2kΩ,
820Ω
2500
2600
2700
LO FREQUENCY (MHz)
LO FREQUENCY (MHz)
IF FREQUENCY (MHz)
10
1250
LOX2 S11 vs. RBIAS
(ENX2 = GND)
1.2kΩ,
2kΩ, 820Ω
______________________________________________________________________________________
2800
2900
3.5GHz Downconverter Mixers
with Selectable LO Doubler
MAX2684
IF PORT S11 vs. RBIAS
1.2kΩ,
2kΩ, 820kΩ
RFIN S11 vs. RBIAS
2kΩ,
1.2kΩ, 820kΩ
Pin Description
PIN
NAME
FUNCTION
1
VCC
Supply Voltage Input. Bypass with a 100pF capacitor as close to the pin as possible.
2, 3, 5, 9,
10, 12, 13,
15, EP
GND
Ground. Connect to ground plane with a low-inductance connection. Solder exposed paddle
evenly to the board ground plane.
4
RFIN
RF Input Port to Mixer. Requires a matching network and a DC-blocking capacitor that may be part
of this network.
6
ENX2
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.
7
LOX2
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.
8
LOX1
Full-Frequency Local-Oscillator Input to Downconverter Mixer. Requires a DC-blocking capacitor.
Leave unconnected if this pin is not used.
11, 14
IFOUT-,
IFOUT+
16
BIAS
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.
______________________________________________________________________________________
11
MAX2683/MAX2684
Typical Operating Characteristics (continued)
(MAX2683/MAX2684 EV kit, VCC = +5V, RBIAS = 1.2kΩ, ENX2 = GND, fRF = 3.6GHz, PRF = -20dBm, fLOX2 = 1650MHz for MAX2683 or
fLOX2 = 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/MAX2684
3.5GHz Downconverter Mixers
with Selectable LO Doubler
Table 1. MAX2683/MAX2684 RFIN Port S-Parameters (VCC = +5V, TA = +25°C)
RF
FREQUENCY
(MHz)
RBIAS = 820Ω
S11 MAG
RBIAS = 1.2kΩ
S11 PHASE
(degrees)
S11 MAG
RBIAS = 2kΩ
S11 PHASE
(degrees)
S11 MAG
S11 PHASE
(degrees)
MAX2683
3400
0.582
-113.3
0.561
-121.3
0.536
-122.3
3450
0.586
-114.8
0.564
-122.5
0.540
-123.5
3500
0.590
-116.2
0.567
-123.7
0.544
-124.7
3550
0.594
-117.5
0.570
-125.1
0.547
-126.0
3600
0.599
-118.7
0.574
-126.1
0.553
-127.0
3650
0.602
-120.0
0.576
-127.2
0.555
-128.1
3700
0.607
-121.2
0.580
-128.3
0.559
-129.1
3750
0.608
-122.3
0.583
-129.3
0.563
-130.1
3800
0.612
-123.5
0.587
-130.2
0.567
-131.0
MAX2684
3400
0.578
-117.5
0.537
-119.7
0.512
-121.3
3450
0.582
-119.0
0.542
-121.2
0.518
-122.7
3500
0.586
-120.5
0.545
-122.6
0.523
-124.1
3550
0.590
-121.8
0.545
-122.7
0.527
-125.5
3600
0.595
-123.1
0.555
-125.4
0.533
-126.8
3650
0.599
-124.5
0.558
-126.7
0.537
-128.0
3700
0.604
-125.7
0.564
-127.8
0.542
-129.1
3750
0.606
-126.7
0.568
-128.9
0.546
-130.2
3800
0.611
-127.9
0.572
-129.9
0.552
-13.1
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.
RF Input
RFIN is a single-ended input that accepts frequencies
in the 3.4GHz to 3.8GHz range. It requires a matching
12
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
______________________________________________________________________________________
3.5GHz Downconverter Mixers
with Selectable LO Doubler
MAX2683/MAX2684
Table 2. MAX2683 LO Port S-Parameters (VCC = +5V, TA = +25°C)
LOX2
(ENX2 = GND)
LOX2
FREQUENCY
(MHz)
S11 MAG
LOX1
(ENX2 = VCC)
S11 PHASE
(degrees)
LOX2
FREQUENCY
(MHz)
S11 MAG
S11 PHASE
(degrees)
RBIAS = 820Ω
1500
0.234
-82.0
3000
0.362
-163.5
1575
0.237
-86.7
3150
0.358
-165.4
1650
0.241
-91.1
3300
0.338
-167.0
1725
0.247
-95.3
3450
0.306
-167.3
1800
0.254
-98.9
3600
0.271
-164.9
1875
0.262
-102.3
3750
0.235
-160.6
1950
0.268
-104.9
3900
0.200
-154.8
RBIAS = 1.2kΩ
1500
0.211
-77.9
3000
0.343
-159.1
1575
0.213
-83.7
3150
0.341
-160.0
1650
0.217
-89.3
3300
0.330
-162.3
1725
0.222
-94.5
3450
0.310
-162.0
1800
0.230
-99.3
3600
0.285
-160.2
1875
0.240
-103.6
3750
0.256
-156.4
1950
0.249
-107.1
3900
0.224
-151.1
RBIAS = 2.0kΩ
1500
0.213
-78.0
3000
0.339
-155.2
1575
0.214
-83.7
3150
0.340
-156.0
1650
0.218
-89.3
3300
0.332
-156.0
1725
0.223
-94.5
3450
0.315
-155.3
1800
0.231
-99.3
3600
0.294
-153.3
1875
0.241
-103.7
3750
0.268
-150.0
1950
0.249
-107.2
3900
0.240
-145.5
(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
MAX2683/MAX2684
3.5GHz Downconverter Mixers
with Selectable LO Doubler
Table 3. MAX2684 LO Port S-Parameters (VCC = +5V, TA = +25°C)
LOX2
(ENX2 = GND)
LOX2
FREQUENCY
(MHz)
S11 MAG
LOX1
(ENX2 = VCC)
S11 PHASE
(degrees)
LOX1
FREQUENCY
(MHz)
S11 MAG
S11 PHASE
(degrees)
RBIAS = 820Ω
1200
0.225
-59.6
2400
0.249
-138.9
1250
0.219
-62.8
2500
0.266
-143.5
1300
0.215
-66.0
2600
0.281
-147.5
1350
0.212
-69.1
2700
0.296
-152.1
1400
0.210
-72.4
2800
0.305
-158.8
1450
0.209
-75.4
2900
0.302
-167.3
RBIAS = 1.2kΩ
1200
0.228
-64.7
2400
0.235
-135.3
1250
0.222
-68.9
2500
0.251
-139.8
1300
0.219
-71.2
2600
0.265
-143.5
1350
0.216
-74.4
2700
0.280
-147.8
1400
0.214
-77.8
2800
0.290
-152.8
1450
0.213
-81.0
2900
0.292
-157.0
RBIAS = 2.0kΩ
1200
0.212
-75.4
2400
0.224
-132.3
1250
0.222
-63.1
2500
0.240
-136.6
1300
0.217
-66.2
2600
0.255
-140.1
1350
0.213
-69.2
2700
0.269
-143.8
1400
0.211
-72.3
2800
0.279
-147.6
1450
0.209
-75.3
2900
0.283
-150.3
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,
______________________________________________________________________________________
3.5GHz Downconverter Mixers
with Selectable LO Doubler
MAX2683/MAX2684
Table 4. MAX2683 IFOUT Port S-Parameters (VCC = +5V, TA = +25°C)
RBIAS = 820Ω
RBIAS = 1.2kΩ
RBIAS = 1.2kΩ
RF
FREQUENCY
(MHz)
S11 MAG
S11 PHASE
(degrees)
S11 MAG
S11 PHASE
(degrees)
S11 MAG
S11 PHASE
(degrees)
150
0.915
-11.3
0.914
-11.2
0.930
-10.9
200
0.907
-14.8
0.905
-14.7
0.920
-14.2
250
0.904
-17.7
0.905
-17.8
0.917
-17.2
300
0.899
-21.3
0.900
-21.3
0.911
-20.3
350
0.894
-24.5
0.893
-24.5
0.907
-23.5
Table 5. MAX2684 IFOUT Port S-Parameters (VCC = +5V, TA = +25°C)
RBIAS = 820Ω
RBIAS = 1.2kΩ
RBIAS = 1.2kΩ
RF
FREQUENCY
(MHz)
S11 MAG
S11 PHASE
(degrees)
S11 MAG
S11 PHASE
(degrees)
S11 MAG
S11 PHASE
(degrees)
860
0.955
-49.4
0.955
-49.6
0.955
-49.7
880
0.952
-50.3
0.952
-50.5
0.950
-50.6
900
0.950
-51.1
0.948
-51.4
0.946
-51.4
920
0.946
-52.0
0.944
-52.3
0.941
-52.3
940
0.943
-53.0
0.940
-53.1
0.937
-53.3
960
0.941
-53.6
0.936
-54.0
0.935
-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.
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 1.2kΩ 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 820kΩ to 2kΩ.
___________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.
Power-Supply and ENX2 Bypassing
Proper voltage-supply bypassing is essential for highfrequency circuit stability. Bypass V CC with a 10µF
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 1.2kΩ) to further reduce coupling of high-frequency signals into the ENX2 pin.
______________________________________________________________________________________
15
MAX2683/MAX2684
3.5GHz Downconverter Mixers
with Selectable LO Doubler
Typical Operating Circuit
VCC
1
100pF
10µF
2
3
3300pF
1.2nH
RF
INPUT
4
5
1pF
BIAS
VCC
16
GND
RBIAS
1.5k
GND
RFIN
GND
8.2pF
MAX2683
IFOUT+
GND
15
GND
14
300MHz
IF OUTPUT
13
39nH
1.2k
LO DOUBLER OFF
ENABLE
ON
6
GND
ENX2
12
VCC
3.3pF
1.5k
0.01µF
100pF
100pF
HALF-FREQUENCY
LO INPUT
3.9nH
39nH
7
IFOUTLOX2
GND
100pF
FULL-FREQUENCY
LO INPUT
8
GND
LOX1
BALUN
11
8.2pF
10
9
NOTE: EVENLY SOLDER EXPOSED PAD (EP)
ON BOTTOM OF DEVICE TO GROUND PLANE.
8.2pF
IFOUT+
GND
14
900MHz
IF OUTPUT
13
6.8nH
GND
12
VCC
300Ω
0.01µF
6.8nH
IFOUT-
BALUN
11
8.2pF
MAX2684 IF OUTPUT DIFFERENTIAL
TO SINGLE-ENDED CONVERSION NETWORK.
16
______________________________________________________________________________________
3.5GHz Downconverter Mixers
with Selectable LO Doubler
TSSOP.EPS
______________________________________________________________________________________
17
MAX2683/MAX2684
Package Information
MAX2683/MAX2684
3.5GHz Downconverter Mixers
with Selectable LO Doubler
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
© 2000 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.