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19-1282; Rev 0; 10/97
KIT
ATION
EVALU
BLE
AVAILA
Low-Noise, 2.5GHz
Downconverter Mixer
____________________________Features
o
7.6dBm Input Third-Order Intercept Point
o
10dB Downconverter Mixer Noise Figure
o
7.9dB Gain
o
400MHz to 2500MHz Wideband Operation
o
Low Cost
o
+2.7V to +5.5V Single-Supply Operation
o
<1µA Shutdown Mode
o
Ultra-Small 10-Pin µMAX Package
_______________General Description
The MAX2690 is a miniature, low-noise, low-power
downconverter mixer designed for use in portable con-
sumer equipment. Signals at the RF input port are
mixed with signals at the local-oscillator (LO) port using
a double-balanced mixer. The RF port frequency range
is 400MHz to 2500MHz. The LO port frequency range is
700MHz to 2500MHz. The IF frequency range is 10MHz
to 500MHz, provided the LO and RF frequencies are
chosen appropriately.
The IF port is differential, which provides good linearity
and low LO emissions, as well as providing compatibili-
ty with applications using differential IF filters, such as
CDMA cellular phones. The mixer noise figure is 10dB
at 900MHz.
The MAX2690 draws 16mA at V
CC
= 3V and operates
from a +2.7V to +5.5V supply. A logic-controlled shut-
down mode reduces the supply current to less than 1µA,
making it ideal for battery-operated equipment. This
device is offered in a miniature 10-pin µMAX package.
MAX2690
________________________Applications
2.45GHz Industrial-Scientific-Medical (ISM)
Band Radios
Wireless Local Area Networks (WLANs)
Personal Communications Systems (PCS)
Code-Division Multiple Access (CDMA)
Communications Systems
Cellular and Cordless Phones
Hand-Held Radios
______________Ordering Information
PART
MAX2690EUB
TEMP. RANGE
-40°C to +85°C
PIN-PACKAGE
10 µMAX
Typical Operating Circuit appears at end of data sheet.
__________________Pin Configuration
TOP VIEW
________________Functional Diagram
TOP VIEW
MAX2690
LGND
1
GND
RFIN
RFBYP
V
CC
2
3
4
5
10
SHDN
9
IFOUT+
IFOUT-
GNDLO
LO
LGND
1
GND
RFIN
RFBYP
V
CC
2
3
4
5
BIAS
10
SHDN
9
8
7
6
IFOUT+
IFOUT-
GNDLO
LO
MAX2690
8
7
6
µMAX
µMAX
________________________________________________________________
Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 408-737-7600 ext. 3468.
Low-Noise, 2.5GHz
Downconverter Mixer
MAX2690
ABSOLUTE MAXIMUM RATINGS
V
CC
to GND ...........................................................-0.3V to +6.0V
RFIN Input Power..............................................................10dBm
LO Input Power .................................................................10dBm
SHDN
Input Voltage ...................................-0.3V to (V
CC
+ 0.3V)
Continuous Power Dissipation
10-Pin µMAX (derate 4.1mW/°C above +70°C) ............330mW
Operating Temperature Range
MAX2690EUB ...................................................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +165°C
Lead Temperature (soldering, 10sec) .............................+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
(V
CC
= +2.7V to +5.5V, no RF signals applied, LO = open, IFOUT+ = IFOUT- = V
CC
,
SHDN
= high, LGND = GND = GNDLO = 0V,
T
A
= T
MIN
to T
MAX
. Typical values are at V
CC
= +3.0V and T
A
= +25°C, unless otherwise noted. Minimum and maximum values are
guaranteed by design and characterization over temperature.)
PARAMETER
Operating Supply Current
Shutdown Input Voltage High
Shutdown Input Voltage Low
Shutdown Supply Current
Shutdown Input Bias Current
SHDN
= 0V
SHDN
= low
0V <
SHDN
< V
CC
-5
4
0.4
2
25
CONDITIONS
MIN
9.5
2
0.5
TYP
16
MAX
20.1
UNITS
mA
V
V
µA
µA
AC ELECTRICAL CHARACTERISTICS
(MAX2690 EV kit; V
CC
= +3.0V; P
LO
= -3dBm; P
RF
= -25dBm;
SHDN
= high; RFIN matched for 900MHz, 1.95GHz, and 2.45GHz as
noted below. Inductor connected from LGND to GND = 39nH for 900MHz operation, 27nH for 1.95GHz operation, and 6.8nH for
2.45GHz operation. T
A
= +25°C, unless otherwise noted.)
PARAMETER
Conversion Gain
(Note 1)
Gain Variation over
Temperature
Input Third-Order Intercept
CONDITIONS
f
RF
= 900MHz, f
LO
= 1.1GHz
f
RF
= 1.95GHz, f
LO
= 1.75GHz
f
RF
= 2.45GHz, f
LO
= 2.1GHz
f
RF
= 1.95GHz, T
A
= T
MIN
to T
MAX
(Note 2)
Two tones at
-25dBm per tone,
f
RF2
= 1MHz above f
RF
f
RF
= 900MHz, f
LO
= 1.1GHz
f
RF
= 1.95GHz, f
LO
= 1.75GHz
f
RF
= 2.45GHz, f
LO
= 2.1GHz
MIN
TYP
7.9
6.4
4
±0.6
7.6
5.3
4.3
10
11.5
12
dB
dBm
±1.2
dB
dB
MAX
UNITS
Noise-Figure
Single Sideband
f
RF
= 900MHz, f
LO
= 1.1GHz
f
RF
= 1.95GHz, f
LO
= 1.75GHz
f
RF
= 2.45GHz, f
LO
= 2.1GHz
2
_______________________________________________________________________________________
Low-Noise, 2.5GHz
Downconverter Mixer
AC ELECTRICAL CHARACTERISTICS (continued)
(MAX2690 EV kit; V
CC
= +3.0V; P
LO
= -3dBm; P
RF
= -25dBm;
SHDN
= high; RFIN matched for 900MHz, 1.95GHz, and 2.45GHz as
noted below. Inductor connected from LGND to GND = 39nH for 900MHz operation, 27nH for 1.95GHz operation, and 6.8nH for
2.45GHz operation. T
A
= +25°C, unless otherwise noted.)
PARAMETER
LO Emission at IF Port
CONDITIONS
f
RF
= 900MHz, f
LO
= 1.1GHz
f
RF
= 1.95GHz, f
LO
= 1.75GHz
f
RF
= 2.45GHz, f
LO
= 2.1GHz
f
RF
= 900MHz, f
LO
= 1.1GHz
LO Emission at RF Port
f
RF
= 1.95GHz, f
LO
= 1.75GHz
f
RF
= 2.45GHz, f
LO
= 2.1GHz
IF/2 Spurious Response
(Note 3)
Turn-On Time
Turn-Off Time
f
RF
= 1.0GHz, f
LO
= 1.1GHz
RF input = -15dBm
(Note 4)
(Note 4)
f
RF
= 1.85GHz, f
LO
= 1.75GHz
f
RF
= 2.275GHz, f
LO
= 2.1GHz
MIN
TYP
-32
-32
-28
-30
-27
-25
-74
-62
-56
1
1.6
µs
µs
dBm
dBm
dBm
MAX
UNITS
MAX2690
Note 1:
Consult the
Applications Information
section for information on designing a matching network.
Note 2:
Guaranteed by design and characterization.
Note 3:
This spurious response is caused by a higher-order mixing product (2x2). Specified RF frequency is applied and IF output
power is observed at the desired IF frequency (200MHz for f
RF
= 900MHz, or 1.95GHz, and 350MHz for f
RF
= 2.45GHz).
Note 4:
From the time
SHDN
goes high to the time I
CC
reaches 90% of its final value (on), or from the time
SHDN
goes low to the
time I
CC
drops below 10µA (off).
_______________________________________________________________________________________
3
Low-Noise, 2.5GHz
Downconverter Mixer
MAX2690
__________________________________________Typical Operating Characteristics
(MAX2690 EV kit, V
CC
= +3.0V, P
LO
= -3dBm, P
RF
= -25dBm, f
RF
= 1.95GHz, f
IF
= 200MHz,
SHDN
= high, T
A
= +25°C, unless
otherwise noted.)
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX2690toc01
SHUTDOWN SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX2690toc02
CONVERSION GAIN
vs. IF FREQUENCY
5.8
5.6
CONVERSION GAIN (dB)
5.4
5.2
5.0
4.8
4.6
4.4
4.2
4.0
f
RF
= 2.45GHz
MAX2690toc03
25
23
21
SUPPLY CURRENT (mA)
19
17
15
13
11
9
7
5
T
A
= +85°C
T
A
= +25°C
T
A
= -40°C
1.6
SHDN = 0V
SHUTDOWN SUPPLY CURRENT (µA)
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
T
A
= -40°C
T
A
= +85°C
T
A
= +25°C
6.0
2.7 3.0 3.3 3.6 3.9 4.2 4.5 4.8 5.1 5.4 5.7
SUPPLY VOLTAGE (V)
2.7 3.0 3.3 3.6 3.9 4.2 4.5 4.8 5.1 5.4 5.7
SUPPLY VOLTAGE (V)
50
100
150
200
250
300
350
IF FREQUENCY (MHz)
CONVERSION GAIN
vs. RF FREQUENCY
MAX2690toc04
NOISE FIGURE
vs. RF FREQUENCY AND TEMPERATURE
MAX2690toc05
RF PORT IMPEDANCE
vs. FREQUENCY
140
120
REAL IMPEDANCE (Ω)
100
80
60
40
REAL
20
0
-300
-350
500
1000
1500
FREQUENCY (MHz)
2000
2500
IMAGINARY
MAX2690toc06
10
8
CONVERSION GAIN (dB)
6
f
IF
= 200MHz
14
12
NOISE FIGURE (dB)
10
T
A
= +25°C
8
6
4
2
0
T
A
= -40°C
f
RF
(MHz)
900
1950
2450
500
1000
1500
2000
f
IF
(MHz)
200
200
350
2500
T
A
= +85°C
0
-50
-100
-150
-200
-250
IMAGINARY IMPEDANCE (Ω)
4
2
0
-2
-4
-6
0
500
1000
1500
2000
2500
3000
RF FREQUENCY (MHz)
f
IF
= 350MHz
f
IF
= 200MHz
3000
RF FREQUENCY (MHz)
CONVERSION GAIN
vs. LO POWER
MAX2690toc07
GAIN AND LINEARITY
vs. LGND INDUCTOR VALUE
MAX2690toc08
LO PORT S11 vs. FREQUENCY
MAX2690toc09
10
8
6
GAIN (dB)
4
2
f
RF
= 1950MHz, f
IF
= 200MHz
0
-2
-4
-6
-15 -13 -11 -9
-7
-5
-3
-1
1
3
5
LO POWER (dBm)
f
RF
= 2450MHz, f
IF
= 350MHz
f
RF
= 900MHz, f
IF
= 200MHz
14
f
RF
= 1.95GHz
GAIN AND LINEARITY (dB or dBm)
12
10
IIP3
8
6
4
2
0
0
12
27
OIP3
10
0
LO PORT S11 (dB)
-10
-20
-30
-40
-50
GAIN
47
0
0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3.0
FREQUENCY (GHz)
LGND INDUCTOR VALUE (nH)
4
_______________________________________________________________________________________
Low-Noise, 2.5GHz
Downconverter Mixer
____________________________Typical Operating Characteristics (continued)
(MAX2690 EV kit, V
CC
= +3.0V, P
LO
= -3dBm, P
RF
= -25dBm, f
RF
= 1.95GHz, f
IF
= 200MHz,
SHDN
= high, T
A
= +25°C, unless
otherwise noted.)
IIP3 vs.
RF FREQUENCY AND TEMPERATURE
MAX2690toc10
MAX2690
SINGLE-ENDED IF PORT EQUIVALENT
SHUNT RC NETWORK
18
16
14
RESISTANCE (kΩ)
CAPACITANCE
MAX2690toc11
IF PORT OUTPUT SPECTRUM
4.0
3.5
OUTPUT POWER (dBm)
3.0
2.5
2.0
CAPACITANCE (pF)
f
RF
= 900MHz
-30
IF = 200MHz
-40
-50
-60
RF
-70
-80
-90
-100
0
0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3.0
FREQUENCY (GHz)
2LO - RF
LO + RF
3LO - RF
LO = 1.1GHz
2LO
MAX2690toc12
9.0
INPUT THIRD-ORDER INTERCEPT (dBm)
8.5
8.0
7.5
7.0
6.5
6.0
5.5
5.0
4.5
4.0
900
1300
1700
2100
T
A
= -40°C
T
A
= +25°C
T
A
= +85°C
f
RF2
= 1MHz ABOVE f
RF
4.5
-20
12
10
8
6
4
2
0
RESISTANCE
1.5
1.0
0.5
0
2500
1
125
250
FREQUENCY (MHz)
375
500
RF FREQUENCY (MHz)
INPUT 1dB COMPRESSION vs.
RF FREQUENCY AND TEMPERATURE
MAX2690toc13
CONVERSION GAIN
vs. SUPPLY VOLTAGE
9
8
CONVERSION GAIN (dB)
7
6
5
4
3
2
1
f
RF
= 2.95GHz, f
IF
= 350MHz
f
RF
= 900MHz, f
IF
= 200MHz
f
RF
= 1.95GHz, f
IF
= 200MHz
MAX2690toc14
-2
T
A
= +85°C T
A
= +25°C
INPUT 1dB COMPRESSION (dBm)
-3
T
A
= -40°C
-4
-5
-6
-7
-8
500
1000
1500
2000
2500
f
RF
(MHz)
900
1950
2450
f
IF
(MHz)
200
200
350
10
3000
0
2.0
2.5
3.0
3.5
4.0
V
CC
(V)
4.5
5.0
5.5
6.0
RF FREQUENCY (MHz)
INPUT IP3 vs. SUPPLY VOLTAGE
MAX2690toc15
CONVERSION GAIN
vs. TEMPERATURE
8
CONVERSION GAIN (dB)
7
6
5
4
3
2
1
0
f
RF
= 2450MHz, f
IF
= 350MHz
f
RF
= 900MHz, f
IF
= 200MHz
f
RF
= 1950MHz, f
IF
= 200MHz
MAX2690toc16
10
9
8
INPUT IP3 (dBm)
7
6
5
4
3
2
1
0
2.0
2.5
3.0
3.5
4.0
V
CC
(V)
4.5
5.0
5.5
f
RF
= 2450MHz, f
IF
= 350MHz
f
RF
= 900MHz, f
IF
= 200MHz
9
f
RF
= 1950MHz, f
IF
= 200MHz
6.0
-40
-20
0
20
40
60
80
100
TEMPERATURE (°C)
_______________________________________________________________________________________
5

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