19-1620; Rev 2; 9/03
KIT
ATION
EVALU
BLE
AVAILA
3.5GHz Downconverter Mixers
with Selectable LO Doubler
General Description
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
MAX2683/MAX2684
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) injec-
tion. 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 exter-
nal 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 per-
formance. 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 inter-
face 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 ultra-
small 16-pin TSSOP-EP package with an exposed pad-
dle for optimum performance at 3.5GHz.
Ordering Information
PART
MAX2683EUE
MAX2684EUE
*Exposed
pad
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
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+
IFOUT-
V
CC
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+
V
CC
BIAS
GND
MAX2683
MAX2684
13 GND
12 GND
11 IFOUT-
10 GND
9
GND
MAX2683
MAX2684
TSSOP-EP
1
________________________________________________________________
Maxim Integrated Products
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.
3.5GHz Downconverter Mixers
with Selectable LO Doubler
MAX2683/MAX2684
ABSOLUTE MAXIMUM RATINGS
V
CC
to 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 (T
A
= +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.
CAUTION!
ESD SENSITIVE DEVICE
DC ELECTRICAL CHARACTERISTICS
(V
CC
= +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
, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at V
CC
= +5V, T
A
= +25°C.) (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
= V
CC
2.0
0.6
10
CONDITIONS
MIN
TYP
55
15
MAX
66
UNITS
mA
mA
V
V
µA
AC ELECTRICAL CHARACTERISTICS—MAX2683
(MAX2683/MAX2684 EV kit, V
CC
= +5V, R
BIAS
= 1.2kΩ,
ENX2
= GND, f
RF
= 3.6GHz, P
RF
= -20dBm, f
LOX2
= 1650MHz, P
LO
= -5dBm,
all input/output ports terminated in 50Ω, IFOUT+ and IFOUT- matched to single-ended 50Ω load, T
A
= +25°C, 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)
f
RFIN
= 1
×
f
LO
ENX2
= GND
f
RFIN
= 2
×
f
LO
f
RFIN
= 3
×
f
LO
(Notes 2, 3)
(Notes 2, 3)
ENX2
= GND (Notes 2, 3)
ENX2
= V
CC
(Notes 2, 3)
(Notes 1, 4)
T
A
= -40°C to +85°C (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
= V
CC
, f
RFIN
= 1
×
f
LO,
f
LOX1
= 3.3GHz
2
_______________________________________________________________________________________
3.5GHz Downconverter Mixers
with Selectable LO Doubler
AC ELECTRICAL CHARACTERISTICS—MAX2683 (continued)
(MAX2683/MAX2684 EV kit, V
CC
= +5V, R
BIAS
= 1.2kΩ,
ENX2
= GND, f
RF
= 3.6GHz, P
RF
= -20dBm, f
LOX2
= 1650MHz, P
LO
= -5dBm,
all input/output ports terminated in 50Ω, IFOUT+ and IFOUT- matched to single-ended 50Ω load, T
A
= +25°C, unless otherwise noted.)
PARAMETER
LOX2 Leakage at IFOUT+,
IFOUT-
LOX1 Leakage at IFOUT+,
IFOUT-
LOX1, LOX2 Input Return Loss
ENX2
= GND
CONDITIONS
f
IFOUT
= 1
×
f
LO
f
IFOUT
= 2
×
f
LO
f
IFOUT
= 3
×
f
LO
MIN
TYP
-39
-39
-64
-39
-20
dBm
MAX
UNITS
MAX2683/MAX2684
ENX2
= V
CC
, f
IFOUT
= 1
×
f
LO,
f
LOX1
= 3.3GHz
(Note 9)
dBm
dB
AC ELECTRICAL CHARACTERISTICS—MAX2684
(MAX2683/MAX2684 EV kit, V
CC
= +5V, R
BIAS
= 1.2kΩ,
ENX2
= GND, f
RF
= 3.6GHz, P
RF
= -20dBm, f
LOX2
= 1350MHz, P
LO
= -5dBm,
all input/output ports terminated in 50Ω, IFOUT+ and IFOUT- matched to single-ended 50Ω load, T
A
= +25°C, 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+,
IFOUT-
LOX1 Leakage at IFOUT+,
IFOUT-
LOX1, LOX2 Input Return Loss
(Note 11)
(Note 7)
(Note 8)
ENX2
= GND
f
RFIN
= 1
×
f
LOX2
f
RFIN
= 2
×
f
LOX2
f
RFIN
= 3
×
f
LOX2
f
RFIN
= 1
×
f
LOX2
f
RFIN
= 2
×
f
LOX2
f
RFIN
= 3
×
f
LOX2
(Notes 2, 3)
(Notes 2, 3)
LOX2 =
GND (Notes 2, 3)
LOX2 =
V
CC
(Notes 2, 3)
(Notes 1, 4)
T
A
= -40°C to +85°C
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
= V
CC
, f
RFIN
= 1
×
f
LOX1,
f
LOX1
= 2.7GHz
ENX2
= GND
ENX2
= V
CC
, f
IFOUT
= 1
×
f
LOX1,
f
LOX1
= 2.7GHz
(Note 9)
dBm
dB
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.
_______________________________________________________________________________________
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, f
IF
= 300MHz.
Note 6:
IIP2 measured with f
RFIN
= 3450MHz, P
RFIN
= -20dBm, f
IF
= 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, f
IF
= 900MHz.
Typical Operating Characteristics
(MAX2683/MAX2684 EV kit, V
CC
= +5V, R
BIAS
= 1.2kΩ,
ENX2
= GND, f
RF
= 3.6GHz, P
RF
= -20dBm, f
LOX2
= 1650MHz for MAX2683 or
f
LOX2
= 1350MHz for MAX2684, P
LO
= -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
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
R
BIAS
= 2.0kΩ
T
A
= -40°C
R
BIAS
= 1.2kΩ
R
BIAS
= 820Ω
T
A
= +25°C
T
A
= +85°C
MAX2683/4 toc02
90
80
SUPPLY CURRENT (mA)
70
60
50
40
30
20
10
0
R
BIAS
= 2.0kΩ
T
A
= -40°C
2.5
3.0
3.5
4.0
4.5
5.0
R
BIAS
= 820Ω
R
BIAS
= 1.2kΩ
T
A
= +85°C
T
A
= +25°C
65
60
SUPPLY CURRENT (mA)
55
50
45
40
35
30
25
20
ENX2 = V
CC
800
1000
1200
1400
R
BIAS
(Ω)
1600
1800
V
CC
= +3.3V
V
CC
= +5V
V
CC
= +3.3V
V
CC
= +5V
ENX2 = GND
5.5
5.5
2000
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
CONVERSION GAIN vs. R
BIAS
MAX2683 toc04
INPUT IP3 vs. R
BIAS
V
CC
= +5V
10
INPUT IP3 (dBm)
9
8
7
6
5
V
CC
= +3.3V
MAX2683/4 toc05
INPUT P1dB vs. R
BIAS
MAX2683 toc06
7.5
V
CC
= +3.3V
11
3
2
INPUT P1dB (dBm)
1
0
V
CC
= +3.3V
-1
-2
-3
7.0
CONVERSION GAIN (dB)
V
CC
= +5V
6.5
V
CC
= +5V
6.0
5.5
5.0
800
1000
1200
1400
R
BIAS
(Ω)
1600
1800
2000
800
1000
1200
1400
R
BIAS
(Ω)
1600
1800
2000
800
1000
1200
1400
R
BIAS
(Ω)
1600
1800
2000
4
_______________________________________________________________________________________
MAX2683/4 toc03
100
SUPPLY CURRENT vs. SUPPLY VOLTAGE
(ENX2 = V
CC
)
100
70
SUPPLY CURRENT vs. R
BIAS
3.5GHz Downconverter Mixers
with Selectable LO Doubler
MAX2683/MAX2684
Typical Operating Characteristics (continued)
(MAX2683/MAX2684 EV kit, V
CC
= +5V, R
BIAS
= 1.2kΩ,
ENX2
= GND, f
RF
= 3.6GHz, P
RF
= -20dBm, f
LOX2
= 1650MHz for MAX2683 or
f
LOX2
= 1350MHz for MAX2684, P
LO
= -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)
MAX2683 toc07
CONVERSION GAIN vs. LO POWER
(ENX2 = V
CC
)
8
6
CONVERSION GAIN (dB)
4
2
0
-2
-4
-6
-8
-10
0
-20
-15
-10
LO POWER (dBm)
-5
0
-16
T
A
= +85°C
T
A
= +25°C
T
A
= -40°C
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
T
A
= +85°C
T
A
= +25°C
T
A
= -40°C
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
(R
BIAS
= 820Ω)
MAX2683 toc10
CONVERSION GAIN vs. SUPPLY VOLTAGE
(R
BIAS
= 1.2kΩ)
MAX2683 toc11
CONVERSION GAIN vs. SUPPLY VOLTAGE
(R
BIAS
= 2kΩ)
9
8
CONVERSION GAIN (dB)
7
6
5
4
3
2
1
0
T
A
= +85°C
T
A
= +25°C
T
A
= -40°C
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
T
A
= +85°C
T
A
= +25°C
T
A
= -40°C
10
9
8
CONVERSION GAIN (dB)
7
6
5
4
3
2
1
0
ENX2 = V
CC
ENX2 = GND
2.5
3.0
3.5
4.0
4.5
5.0
T
A
= +85°C
T
A
= +25°C
T
A
= -40°C
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
(R
BIAS
= 820Ω)
MAX2683 toc13
INPUT IP3 vs. SUPPLY VOLTAGE
(R
BIAS
= 1.2kΩ)
T
A
= +85°C
9
INPUT IP3 (dBm)
T
A
= +25°C
INPUT IP3 (dBm)
MAX2683 toc14
INPUT IP3 vs. SUPPLY VOLTAGE
(R
BIAS
= 2kΩ)
MAX2683 toc15
15
10
10
12
INPUT IP3 (dBm)
9
9
T
A
= +25°C
T
A
= -40°C
8
8
T
A
= +85°C
6
T
A
= +85°C
7
T
A
= -40°C
7
T
A
= -40°C
3
6
6
T
A
= +25°C
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)
_______________________________________________________________________________________
5
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