PCS LNA/Downconverter
1800-2000 MHz
Features
•
•
•
•
•
•
•
Highly Integrated LNA and Downconverter
3mm 16-Lead PQFN
Operates over 2.7 V to 5 V Supply Voltage
Low Noise Figure: 2.3 dB Typical
High Input Intercept Point: -9 dBm Typical
Continuous Current Control Downconverter
Low LO Drive Level: -10 dBm
MADCSM0012
V2
Functional Block Diagram
Description
M/A-COM’s
MADCSM0012
integrated
downconverter combines a low noise amplifier, a RF
amplifier, a downconverting mixer, an IF amplifier,
and LO buffer amplifier. The MADCSM0012 is
packaged in a low cost 3mm 16-Lead PQFN with an
exposed pad for improved high frequency
grounding.
M/A-COM designed the MADCSM0012 for handsets
requiring wide dynamic range and low power
consumption. By application of a suitable control
voltage to pin 6, the linearity of the device can be
controlled in real time to keep the current as low as
possible
The MADCSM0012 is fabricated using M/A-COM’s
0.5-micron low noise E/D GaAs MESFET process.
The process features full passivation for increased
performance and reliability.
Pin Configuration
Pin No. Pin Name
1
2
3
4
5
6
LNA IN
GND
LNA SRC
LNA OUT
LNA V
DD2
V
CTL
GND
RFA V
DD
GND
RFA IN
LOA V
DD
GND
LOA IN
IF OUT
IFA MATCH
LNA V
DD1
Description
Input to LNA; RF matching required
DC and RF Ground
Source of LNA output stage FET.
RF bypassing required. Off-chip resis-
tor may be used to increase IIP3
50 Ohm LNA output; DC Blocked
LNA second stage supply voltage;
RF bypassing required
Downconverter bias control.
0 to 3.0 V allowed
DC and RF Ground
RFA supply voltage;
RF bypassing required
DC and RF Ground
50 Ohm RFA Input; DC Blocked
LOA supply voltage;
RF bypassing required
DC and RF Ground
Local oscillator input (-10 to –5 dBm)
IF Output of downconverter;
IF matching required
IF matching between mixer and IFA;
required an inductor to ground
LNA first stage supply voltage;
RF bypassing required
Ordering Information
1
Part Number
MADCSM0012
MADCSM0012TR
MADCSM0012SMB
Package
Bulk Packaging
Tape and Reel (1K Reel)
Sample Test Board
7
8
9
10
11
12
13
14
15
16
1. Reference Application Note M513 for reel size information.
Absolute Maximum Ratings
2,3
Parameter
Voltage
Input Power
Operating Temperature
Storage Temperature
Absolute Maximum
6V
0 dBm
-30°C to +85°C
-65°C to +150°C
1
2. Exceeding any one or combination of these limits may cause
permanent damage to this device.
3. M/A-COM does not recommend sustained operation near
these survivability limits.
M/A-COM Inc. and its affiliates reserve the right to make changes to the
product(s) or information contained herein without notice. M/A-COM makes
no warranty, representation or guarantee regarding the suitability of its
products for any particular purpose, nor does M/A-COM assume any liability
whatsoever arising out of the use or application of any product(s) or
information.
•
North America
Tel: 800.366.2266 / Fax: 978.366.2266
•
Europe
Tel: 44.1908.574.200 / Fax: 44.1908.574.300
•
Asia/Pacific
Tel: 81.44.844.8296 / Fax: 81.44.844.8298
Visit www.macom.com for additional data sheets and product information.
PCS LNA/Downconverter
1800-2000 MHz
Electrical Specifications - Korean Band PCS:
Test Conditions: V
DD
= 3.0 V,
RF = 1855 MHz, IF = 210 MHz, LO = 1645 MHz, LO = -10 dBm, T
A
= 25°C
MADCSM0012
V2
Low Noise Amplifier
Parameter
Gain
Noise Figure
VSWR In/Out
Input IP3
Idd
Test Conditions
—
—
—
—
—
Units
dB
dB
Ratio
dBm
mA
Min
—
—
—
—
—
Typ
15
1.35
2:1
6
15
Max
—
—
—
—
—
Cascaded LNA/Downconverter
4
Parameter
Conversion Gain
Noise Figure
Input IP3
Isolation
I
DD
Test Conditions
V
CTL
= 3.0 V
V
CTL
= 1.0 V
V
CTL
= 3.0 V
RF Input = -30 dBm, V
CTL
= 3.0V
LO to RF, V
CTL
= 3.0 V
LO to IF, V
CTL
= 3.0 V
RF to IF, V
CTL
= 3.0 V
V
CTL
= 3.0 V
Units
dB
dB
dB
dBm
dB
dB
dB
mA
Min.
22.5
—
—
-11
—
—
—
—
Typ.
25
21
2.3
-9
50
31
18
25
Max.
27.5
—
3.2
—
—
—
—
37
4. Complete cascaded measurements taken with 3 dB pad between LNA output and Downconverter input (RFA IN).
Sample Board Schematic
IFA OUT
C9
LNA VDD1
L3
C8
C7
IFA VDD
LOA IN
16
External Circuitry Parts List
(Korean Band PCS)
L2
Part
C1
C2
Value
10 pF
1.2 pF
0.1 µF
0.1 µF
0.1 µF
6.8 pF
6.2 nH
47 nH
120 nH
—
3010
Ω
Case
Size
0402
0402
0402
0402
0402
0402
0603
0603
0603
0603
0603
Purpose
LNA Input Matching
LNA Input Matching
LNA Source Bypass
RF Bypass
IF Bypass
IF Matching
LNA Matching
IF Output Matching
IF Mixer Matching
Optional Resistor to
increase LNA IIP3
Voltage Control Resistor
C1
LNA IN
C2
R1
C3
LNA OUT
L1
1
C6
LOA VDD
RFA IN
C3
C4, C5,
C6, C9
C7
C8
L1
LNA VDD2
C4
R2
C5
RFA VDD
L2
L3
R1
R2
VCTL
2
M/A-COM Inc. and its affiliates reserve the right to make changes to the
product(s) or information contained herein without notice. M/A-COM makes
no warranty, representation or guarantee regarding the suitability of its
products for any particular purpose, nor does M/A-COM assume any liability
whatsoever arising out of the use or application of any product(s) or
information.
•
North America
Tel: 800.366.2266 / Fax: 978.366.2266
•
Europe
Tel: 44.1908.574.200 / Fax: 44.1908.574.300
•
Asia/Pacific
Tel: 81.44.844.8296 / Fax: 81.44.844.8298
Visit www.macom.com for additional data sheets and product information.
PCS LNA/Downconverter
1800-2000 MHz
Operating Instructions
M/A-COM’s MADCSM0012 is a highly integrated
MMIC LNA/downconverter for operation in the
1800-2000 MHz PCS frequency band.
The
downconverter provides exceptional RF
performance while consuming low DC current and
is packaged in a low cost plastic package. It is ideal
for lightweight battery operated portable radio
systems.
The MADCSM0012 consists of an LNA, RFA,
single-ended mixer and single-ended IF output
buffer as shown in the block diagram. Surface
mount resistors, inductors and capacitors are used
in conjunction with the LNA/downconverter to
optimize the trade-offs among
performance,
tunability and ease of use. The sample board
schematic shows the LNA/downconverter and
required off-chip components.
The input of the LNA is matched externally with a
series inductor (L1) and a shunt capacitor (C1) to
provide a low loss match to the optimum noise
impedance in the band of interest. A high Q
inductor such as Coilcraft’s 0402CS series must be
used if the specified noise figures are to be
achieved. The series capacitor, C2, is a DC
blocking and input matching capacitor. The LNA is
nominally biased with 15 mA to give an input IP3 of
+6 dBm. An external resistor, R1, may be used to
increase the LNA bias current and thus increase
the IP3. An external image reject filter is required
between the LNA output and RFA input to
prevent downconversion of noise at the image
frequency to the IF. This filter should have a 50-
ohm input and output impedance.
The mixer is a single-ended floating FET mixer that
provides exceptional linearity and isolation with low
loss and no DC current. An off-chip inductor, L3, is
required to match the output of the mixer to the
input of the IF buffer amplifier. The case size of L3
is typically 0603 but if more gain is needed, use a
0805 case size.
MADCSM0012
V2
The IF output port is the open drain of the IF buffer
amplifier. This allows maximum flexibility of the
intermediate frequency and also IF filter.
A
matching network such as that shown herein can
be used to match to 50 ohms from the output
impedance of the buffer to the input impedance of
the filter at the 210 MHz intermediate frequency.
The inductor also acts as a choke for the DC
supply line. Elements L2 and C8 provide the
necessary impedance transformation.
The LO input port is matched on-chip to 50 ohms.
An LO buffer amplifier amplifies the -10 dBm input
signal to the level required to drive the mixer.
Performance is optimum with a drive level of -7
dBm.
All DC supply lines must be properly bypassed at
RF frequencies to obtain optimum performance
and at lower frequency to maintain unconditional
stability. Capacitors C4, C5, C6, C7 and C9 are
RF bypass capacitors for the LNA, RFA and LOA.
The value and placement of these capacitors is
critical in determining the frequency response of
these amplifiers. Capacitor C3 is a source bypass
capacitor for the second stage of the low noise
amplifier. The placement of this capacitor will
affect the gain of the LNA. For best performance,
all the RF bypass capacitors should be placed as
close to the device as possible.
Recommended PCB Configuration
3
M/A-COM Inc. and its affiliates reserve the right to make changes to the
product(s) or information contained herein without notice. M/A-COM makes
no warranty, representation or guarantee regarding the suitability of its
products for any particular purpose, nor does M/A-COM assume any liability
whatsoever arising out of the use or application of any product(s) or
information.
•
North America
Tel: 800.366.2266 / Fax: 978.366.2266
•
Europe
Tel: 44.1908.574.200 / Fax: 44.1908.574.300
•
Asia/Pacific
Tel: 81.44.844.8296 / Fax: 81.44.844.8298
Visit www.macom.com for additional data sheets and product information.
PCS LNA/Downconverter
1800-2000 MHz
Typical Performance Curves vs. Temperature
LNA Gain
17
MADCSM0012
V2
LNA Output Return Loss
0
-30°C
16
-5
+25°C
+85°C
15
-10
14
-30°C
+25°C
+85°C
-15
13
1840
1845
1850
1855
1860
1865
1870
-20
1840
1845
1850
1855
1860
1865
1870
Frequency (MHz)
Frequency (MHz)
LNA Input Return Loss
0
-30°C
+25°C
LNA Input IP3
10
-30°C
+25°C
-5
+85°C
8
+85°C
-10
6
-15
4
-20
1840
1845
1850
1855
1860
1865
1870
2
1840
1845
1850
1855
1860
1865
1870
Frequency (MHz)
Frequency (MHz)
LNA Noise Figure
2.5
Full Chain Conversion Gain
28
2.0
26
1.5
24
1.0
22
-30°C
+25°C
+85°C
0.5
-30°C
+25°C
+85°C
0.0
1840
1845
1850
1855
1860
1865
1870
20
1840
1845
1850
1855
1860
1865
1870
4
Frequency(MHz)
M/A-COM Inc. and its affiliates reserve the right to make changes to the
product(s) or information contained herein without notice. M/A-COM makes
no warranty, representation or guarantee regarding the suitability of its
products for any particular purpose, nor does M/A-COM assume any liability
whatsoever arising out of the use or application of any product(s) or
information.
Frequency (MHz)
•
North America
Tel: 800.366.2266 / Fax: 978.366.2266
•
Europe
Tel: 44.1908.574.200 / Fax: 44.1908.574.300
•
Asia/Pacific
Tel: 81.44.844.8296 / Fax: 81.44.844.8298
Visit www.macom.com for additional data sheets and product information.
PCS LNA/Downconverter
1800-2000 MHz
Typical Performance Curves vs. Temperature
Full Chain Noise Figure
4
MADCSM0012
V2
Full Chain Input IP3
-6
3
-8
2
-10
1
-30°C
+25°C
+85°C
-12
-30°C
+25°C
+85°C
0
1840
1845
1850
1855
1860
1865
1870
-14
1840
1845
1850
1855
1860
1865
1870
Frequency (MHz)
Frequency (MHz)
Full Chain IF Return Loss
0
Full Chain LO Return Loss
0
-5
-10
-15
-20
-30°C
-5
-10
-15
-20
-30°C
+25°C
+85°C
-25
-30
150
-25
-30
1200
+25°C
+85°C
175
200
225
250
275
300
1400
1600
1800
2000
2200
Frequency (MHz)
Frequency (MHz)
Full Chain Port to Port Isolation
60
Full Chain Conversion Gain vs. V
CTL
28
1.0 V
2.0 V
3.0 V
50
26
40
30
20
22
24
10
0
1840
LO-to-IF
RF-to-IF
LO-to-RF
RF-to-LO
1850
1860
1870
20
1840
1845
1850
1855
1860
1865
1870
Frequency (MHz)
5
M/A-COM Inc. and its affiliates reserve the right to make changes to the
product(s) or information contained herein without notice. M/A-COM makes
no warranty, representation or guarantee regarding the suitability of its
products for any particular purpose, nor does M/A-COM assume any liability
whatsoever arising out of the use or application of any product(s) or
information.
Frequency (MHz)
•
North America
Tel: 800.366.2266 / Fax: 978.366.2266
•
Europe
Tel: 44.1908.574.200 / Fax: 44.1908.574.300
•
Asia/Pacific
Tel: 81.44.844.8296 / Fax: 81.44.844.8298
Visit www.macom.com for additional data sheets and product information.
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