19-1303; Rev 0; 10/97
KIT
ATION
EVALU
BLE
AVAILA
Low-Cost Downconverter
with Low-Noise Amplifier
____________________________Features
o
Integrated LNA/Downconverter
o
3.2dB Combined Receiver Noise Figure:
2.5dB (LNA)
9.1dB (mixer)
o
-12.5dBm Combined Receiver Input IP3:
-9.5dBm (LNA)
4.5dBm (mixer)
o
LO Buffer
o
+2.7V to +5.5V Single-Supply Operation
o
60mW Power Consumption
o
Low-Power Shutdown Mode
________________General Description
The MAX2406 low-noise amplifier (LNA)/downconverter
mixer is designed for use over a wide range of frequen-
cies and is optimized for communications systems
operating at a frequency of 1.9GHz. Applications
include PWT1900/DCT1900, DCS1800/PCS1900, PHS,
and DECT. This device includes an LNA, a downcon-
verter mixer, and a local-oscillator (LO) buffer in a low-
cost, plastic surface-mount package. At 1.9GHz, the
LNA has 2.5dB typical noise figure and a -9.5dBm input
third-order intercept point (IP3). The downconverter
mixer has a low 9.1dB noise figure and a 4.5dBm input
IP3. Image and LO filtering are implemented off-chip for
maximum flexibility.
The MAX2406 has a differential IF port that can be used
in a single-ended configuration by tying the unused
side to V
CC
. The LO buffer can be driven differentially
or in a single-ended configuration with only -10dBm of
LO power. Power consumption is 60mW in receive
mode, and typically drops to less than 1µW in shut-
down mode.
For transceiver applications, the MAX2410 or
MAX2411A both offer a transmitter along with a similar
receiver.
MAX2406
______________Ordering Information
PART
MAX2406EEP
TEMP. RANGE
-40°C to +85°C
PIN-PACKAGE
20 QSOP
________________________Applications
PWT1900/DCT1900
DCS1800/PCS1900
PHS/PACS
DECT
________________Functional Diagram
LNAOUT
RXMXIN
__________________Pin Configuration
TOP VIEW
GND 1
LNAIN 2
20 GND
19 LNAOUT
18 GND
17 GND
16 RXMXIN
15 GND
14 IF
13 IF
12 GND
LNAIN
IF
IF
GND 3
GND 4
V
CC
5
RXEN 6
MAX2406
RXEN
POWER
MANAGEMENT
LO 7
LO 8
LO LO
V
CC
9
GND 10
MAX2406
QSOP
11 GND
Typical Application Functional Diagram appears at end of
data sheet.
________________________________________________________________
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-Cost Downconverter
with Low-Noise Amplifier
MAX2406
ABSOLUTE MAXIMUM RATINGS
V
CC
to GND ................................................................-0.3V to 6V
LNAIN Input Power ...........................................................15dBm
LO,
LO
Input Power ..........................................................10dBm
RXMXIN Input Power ........................................................10dBm
RXEN Voltage to GND ................................-0.3V to (V
CC
+ 0.3V)
RXEN Current........................................................................5mA
Continuous Power Dissipation (T
A
= +70°C)
QSOP (derate 9.1mW/°C above +70°C) ......................727mW
Junction Temperature ......................................................+150°C
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature.........................................-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, RXEN = 2V, LNAIN = RXMXIN = open, LNAOUT pulled up with 100Ω to V
CC
, IF and
IF
pulled up with 50Ω to
V
CC
, T
A
= -40°C to +85°C. Typical values are at T
A
= +25°C and V
CC
= 3.0V, unless otherwise noted.)
PARAMETER
Supply-Voltage Range
RXEN Input Voltage High
RXEN Input Voltage Low
RXEN Input Bias Current
Supply Current, Receive Mode
Supply Current, Shutdown Mode
RXEN = GND, V
CC
= 3.0V
RXEN = 2.0V
0.1
20
0.1
CONDITIONS
MIN
2.7
2.0
0.6
1.0
30
10
TYP
MAX
5.5
UNITS
V
V
V
µA
mA
µA
AC ELECTRICAL CHARACTERISTICS
(MAX2406EVKIT, Rev. B, V
CC
= 3.0V, RXEN = V
CC
, ƒ
LO
= 1.5GHz, ƒ
LNAIN
= ƒ
RXMXIN
= 1.9GHz, P
LNAIN
= -30dBm,
P
RXMXIN
= -21.5dBm, P
LO
= -10dBm, differential IF operation, 50Ω system, T
A
= +25°C, unless otherwise noted.)
PARAMETER
LNA Gain (Note 1)
LNA Noise Figure
LNA Input IP3
LNA Output 1dB Compression
Mixer Conversion Gain (Note 1)
Mixer Noise Figure
Mixer Input IP3
Mixer Input 1dB Compression
Mixer Output Frequency
Receiver Turn-On Time
Minimum LO Drive Level
LO to LNAIN Leakage
Note 1:
Note 2:
Note 3:
Note 4:
(Notes 1 and 4)
(Notes 1 and 5)
(Note 6)
RXEN = high or low
0.5
-17
-49
T
A
= +25°C
T
A
= T
MIN
to T
MAX
Single sideband
(Note 3)
7.4
6.2
9.1
4.5
-7
450
2.5
(Note 2)
T
A
= +25°C
T
A
= T
MIN
to T
MAX
CONDITIONS
MIN
13.6
12.2
2.5
-9.5
-5.6
8.4
9.0
10.2
TYP
16
MAX
17.6
18.8
UNITS
dB
dB
dBm
dBm
dB
dB
dBm
dBm
MHz
µs
dBm
dBm
Guaranteed by design and characterization.
1.9GHz and 1.901GHz tones at -30dBm per tone.
1.9GHz and 1.901GHz tones at -21.5dBm per tone.
Mixer operation is guaranteed to this frequency. For optimum gain, adjust IF output match. See the IF Output Impedance
(single ended) vs. Frequency graph in the
Typical Operating Characteristics.
Note 5:
Time from RXEN = low to RXEN = high, until the combined receive gain is within 1dB of its final value. Measured with 47pF
blocking capacitors on LNAIN and LNAOUT.
Note 6:
At this LO drive level, the mixer conversion gain is typically 1dB lower than with -10dBm LO drive.
2
_______________________________________________________________________________________
Low-Cost Downconverter
with Low-Noise Amplifier
__________________________________________Typical Operating Characteristics
(MAX2406EVKIT, Rev. B, V
CC
= 3.3V, RXEN = V
CC
, ƒ
LO
= 1.5GHz, ƒ
LNAIN
= ƒ
RXMXIN
= 1.9GHz, P
LNAIN
= -30dBm,
P
RXMXIN
= -21.5dBm, P
LO
= -10dBm, differential IF operation, 50Ω system, T
A
= +25°C, unless otherwise noted.)
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
MAX2406-01
MAX2406-02
MAX2406
SUPPLY CURRENT vs. TEMPERATURE
25
V
CC
= 3.0V
SUPPLY CURRENT (mA)
20
V
CC
= 2.7V
15
V
CC
= 5.5V
2.0
SHUTDOWN SUPPLY CURRENT (
µA)
LNA INPUT IMPEDANCE vs. FREQUENCY
MAX2406-03A
120
100
REAL IMPEDANCE (Ω)
80
60
40
20
0
REAL
MEASURED AT
DEVICE PIN
IMAGINARY
40
0
-40
-80
-120
-160
-200
3000
1.5
1.0
V
CC
= 5.5V
V
CC
= 4V
10
0.5
V
CC
= 3V
V
CC
= 2.7V
5
-40
-15
10
35
60
85
TEMPERATURE (°C)
0
-40
-15
10
35
60
85
TEMPERATURE (°C)
0
500
1000
1500
2000
2500
FREQUENCY (MHz)
LNA OUTPUT IMPEDANCE
vs. FREQUENCY
300
250
REAL IMPEDANCE (Ω)
200
150
100
50
0
0
500
1000
1500
2000
2500
FREQUENCY (MHz)
REAL
IMAGINARY
MEASURED AT
DEVICE PIN
MAX2406-03B
LNA GAIN vs. FREQUENCY
MAX2406-04
LNA GAIN vs. TEMPERATURE
MAX2406-05
0
-20
-40
-60
-80
25
WITH 1pF SHUNT
CAPACITOR AT INPUT
22
V
CC
= 5.5V
V
CC
= 4V
GAIN (dB)
IMAGINARY IMPEDANCE (Ω)
20
20
GAIN (dB)
15
WITHOUT 1pF SHUNT
CAPACITOR AT INPUT
18
10
16
V
CC
= 3V
V
CC
= 2.7V
-100
-120
3000
5
14
0
800
1240
1680
2120
2560
3000
FREQUENCY (MHz)
12
-40
-15
10
35
60
85
TEMPERATURE (°C)
LNA INPUT IP3 vs. TEMPERATURE
MAX2406-06
LNA OUTPUT 1dB COMPRESSION POINT
vs. TEMPERATURE
MAX2406-07
LNA NOISE FIGURE vs. FREQUENCY
4.5
4.0
MAX2406-09
-7
V
CC
= 5.5V
V
CC
= 3.0V
-9
0
OUTPUT 1dB COMPRESSION POINT (dBm)
5.0
-8
INPUT IP3 (dBm)
-2
V
CC
= 5.5V
-4
V
CC
= 3.0V
-6
V
CC
= 2.7V
NOISE FIGURE (dB)
3.5
3.0
2.5
2.0
1.5
1.0
0.5
-10
V
CC
= 2.7V
-11
-8
-12
-40
-15
10
35
60
85
TEMPERATURE (°C)
-10
-40
-15
10
35
60
85
TEMPERATURE (°C)
0.0
100
480
860
1240
1620
2000
FREQUENCY (MHz)
_______________________________________________________________________________________
3
IMAGINARY IMPEDANCE (Ω)
Low-Cost Downconverter
with Low-Noise Amplifier
MAX2406
____________________________Typical Operating Characteristics (continued)
(MAX2406EVKIT, Rev. B, V
CC
= 3.3V, RXEN = V
CC
, ƒ
LO
= 1.5GHz, ƒ
LNAIN
= ƒ
RXMXIN
= 1.9GHz, P
LNAIN
= -30dBm,
P
RXMXIN
= -21.5dBm, P
LO
= -10dBm, differential IF operation, 50Ω system, T
A
= +25°C, unless otherwise noted.)
RX MIXER INPUT IMPEDANCE
vs. FREQUENCY
300
250
REAL IMPEDANCE (Ω)
200
150
100
REAL
50
0
0
500
1000
1500
2000
2500
FREQUENCY (MHz)
-300
-350
3000
MEASURED AT
DEVICE PIN
IMAGINARY
MAX2406-10
MIXER GAIN vs. FREQUENCY
MAX2406-11
MIXER GAIN vs. TEMPERATURE
V
CC
= 5.5V
V
CC
= 4.0V
V
CC
= 2.7V, 3.0V
MAX2406-12
-50
-100
-150
-200
-250
20
15
10
GAIN (dB)
5
IMAGINARY IMPEDANCE (Ω)
900MHz
NARROW- 2.4GHz
BAND
NARROW-
MATCH
BAND
MATCH
15
GAIN (dB)
3GHz
NARROW-
BAND
MATCH
13
11
1.9GHz EV KIT MATCH
0
-5
-10
0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3.0 3.3
FREQUENCY (GHz)
9
7
5
-40
-15
10
35
60
85
TEMPERATURE (°C)
MIXER INPUT IP3 vs. TEMPERATURE
MAX2406-13
MIXER GAIN vs. LO POWER
MAX2406-14
MIXER NOISE FIGURE vs. LO POWER
V
CC
= 3.0V
13
NOISE FIGURE (dB)
MAX2406-15
7
10.0
9.5
9.0
8.5
GAIN (dB)
8.0
7.5
7.0
6.5
6.0
5.5
V
CC
= 3.0V
15
6
INPUT IP3 (dBm)
V
CC
= 5.5V
11
5
V
CC
= 3.0V
V
CC
= 2.7V
9
4
7
3
-40
-15
10
35
60
85
TEMPERATURE (°C)
5.0
-18 -16 -14 -12 -10
-8
-6
-4
-2
0
LO POWER (dBm)
5
-18
-16
-14
-12
-10
-8
-6
-4
0
LO POWER (dBm)
LNA AND MIXER NOISE FIGURE
vs. SUPPLY VOLTAGE
MAX2406-16
LO PORT RETURN LOSS
vs. FREQUENCY
MEASURED ON EV KIT
WITH 220pF SERIES C
AT LO PORT
MAX2406-17
IF OUTPUT IMPEDANCE (SINGLE ENDED)
vs. FREQUENCY
700
600
REAL IMPEDANCE (Ω)
500
IMAGINARY
400
300
200
100
0
REAL
0
200
400
600
800
MEASURED AT
DEVICE PIN
-300
-400
-500
-600
-700
1000
MAX2406-18
10
9
8
NOISE FIGURE (dB)
7
6
5
4
3
2
1
0
2.5
3.0
3.5
4.0
4.5
5.0
LNA
MIXER
0
5
RETURN LOSS (dB)
10
15
20
25
30
0
-100
-200
IMAGINARY IMPEDANCE (Ω)
IF TIED TO V
CC
5.5
0
500
1000
1500
2000
2500
3000
SUPPLY VOLTAGE (V)
FREQUENCY (MHz)
FREQUENCY (MHz)
4
_______________________________________________________________________________________
Low-Cost Downconverter
with Low-Noise Amplifier
______________________________________________________________Pin Description
PIN
1, 3, 4, 10,
11, 12,
15, 20
2
NAME
GND
FUNCTION
Ground. Connect to ground plane with minimal inductance.
RF Input to the LNA. At 1.9GHz, LNAIN can be easily matched to 50Ω with one external shunt 1pF
capacitor. AC couple to this pin. See the LNA Input Impedance vs. Frequency plot in the
Typical
Operating Characteristics.
Supply Voltage (+2.7V to +5.5V). Bypass V
CC
to GND at each pin with a 47pF capacitor as close to each
pin as possible.
Enable Control Input, active high. Logic high activates all part functions. A logic low places the device in
shutdown mode.
50Ω Local-Oscillator Input Port. AC couple to this pin.
50Ω Inverting Local-Oscillator Input Port. For single-ended LO operation, connect
LO
directly to GND. If
a differential LO signal is available, AC couple the inverted LO signal to this pin.
Noninverting Side of Downconverter’s Differential Open-Collector IF Output. Pull IF up to V
CC
with an
inductor. This inductor can be part of the matching network to the desired IF impedance. Alternatively, a
resistor can be placed in parallel to set a terminating impedance.
Inverting Side of Downconverter’s Differential Open-Collector IF Output. Follow recommendations for IF
output above. If single-ended operation is desired, connect
IF
directly to V
CC
.
RF Input of Downconverter Mixer. AC couple to this pin. A matching network may be required to match
RXMXIN to an external filter. Consult the Rx Mixer Input Impedance vs. Frequency plot in the
Typical
Operating Characteristics.
LNA Output Ground. Connect to ground plane with minimal inductance.
Downconverter Mixer Input Ground. Connect to ground plane with minimal inductance.
LNA Output. This output typically provides a VSWR of better than 2:1 at frequencies from 1.8GHz to 2.5GHz
with no external matching components. At other frequencies, a matching network may be required to match
this pin to an external filter. Consult the LNA Output Impedance vs. Frequency plot in the
Typical Operating
Characteristics.
MAX2406
LNAIN
5, 9
6
7
8
V
CC
RXEN
LO
LO
13
IF
14
IF
16
17
18
RXMXIN
GND
GND
19
LNAOUT
_______________Detailed Description
The following sections describe each of the blocks in
the MAX2406 Functional Diagram.
The MAX2406 consists of four major components: a low-
noise amplifier (LNA), a downconverter mixer, a local-
oscillator (LO) buffer, and a power-management block.
of better than 2:1 at the input and output. As with every
LNA, the input match can be traded off for better noise
figure.
Receive Mixer
The receive mixer is a wideband, double-balanced
design with excellent noise figure and linearity.
Low-Noise Amplifier
The LNA is a wideband, single-ended cascode amplifi-
er that can be used over a wide range of frequencies.
Refer to the LNA Gain vs. Frequency graph in the
Typical Operating Characteristics.
Its port impedances
are optimized for operation around 1.9GHz, requiring
only a 1pF shunt capacitor at the LNA input for a VSWR
RF Inputs
The RXMXIN input is typically connected to the LNA
output through an off-chip filter providing enhanced
flexibility. This input is externally matched to 50Ω. See
Figure 1 for an example matching network for 1.9GHz,
and the Rx Mixer Input Impedance vs. Frequency
graph in the
Typical Operating Characteristics.
5
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