PCS LNA/Downconverter,

1800 - 2000 MHz

MADCSM0012

V 1.00

Features

Highly Integrated LNA and Downconverter

3mm FQFP-N Plastic Package

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

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 FQFP-N plastic package 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.

Electrical Specifications - Korean Band PCS:

Test Conditions: VDD = 3.0 V,

RF = 1855 MHz, IF = 210 MHz, LO = 1645 MHz, LO = -10 dBm, T

= 25°C

Parameter

Test Conditions

Units

Min

Typ

Max

Gain

Noise Figure

1.35

VSWR In/Out

Ratio

2:1

Input IP3

dBm

Idd

FQFP-N, 3mm, 16 Lead

Low Noise Amplifier

Parameter

Test Conditions

Units

Min

Typ

Max

Conversion Gain

CTL

= 3.0 V

CTL

= 1.0 V

dB
dB

22.5

25
21

27.5

Noise Figure

CTL

= 3.0 V

2.3

3.2

Input IP3

RF Input = -30 dBm, V

CTL

= 3.0V

dBm

-11

-9

Isolation

LO to RF, V

CTL

= 3.0 V

LO to IF, V

CTL

= 3.0 V

RF to IF, V

CTL

= 3.0 V

dB
dB
dB

--
--
--

50
31
18

--
--
--

Idd

CTL

= 3.0 V

Cascaded LNA/Downconverter

1. Complete cascaded measurements taken with 3 dB pad between LNA output and Downconverter input (RFA IN).

PCS LNA/Downconverter, 1800 - 2000 MHz

MADCSM0012

V 1.00

M/A-COM Inc. and its affiliates reserve the right to make changes to the product(s)
or information contained herein without notice.

Visit www.macom.com for additional data sheets and product information.

North America: Tel. (800) 366-2266

Asia/Pacific: Tel.+81-44-844-8296, Fax +81-44-844-8298

Europe: Tel. +44 (1344) 869 595, Fax+44 (1344) 300 020

Pin Configuration

Pin
No.

Pin

Name

Description

LNA IN

Input to LNA; RF matching required

GND

DC and RF Ground

LNA SRC

Source of LNA output stage FET.

RF bypassing required. Off-chip resistor

may be used to increase IIP3

LNA OUT

50 Ohm LNA output; DC Blocked

LNA V

DD2

LNA second stage supply voltage;

RF bypassing required

CTL

Downconverter bias control.

0 to 3.0 V allowed

GND

DC and RF Ground

RFA V

RFA supply voltage;

RF bypassing required

GND

DC and RF Ground

RFA IN

50 Ohm RFA Input; DC Blocked

LOA V

LOA supply voltage;

RF bypassing required

GND

DC and RF Ground

LOA IN

Local oscillator input (-10 to 5 dBm)

IF OUT

IF Output of downconverter;

IF matching required

IFA

MATCH

IF matching between mixer and IFA;

required an inductor to ground

LNA V

DD1

LNA first stage supply voltage;

RF bypassing required

Absolute Maximum Ratings

Sample Board Schematic

2. Exceeding any one or combination of these limits may cause

permanent damage to this device

LOA VDD

LNA IN

LNA OUT

LOA IN

RFA VDD

IFA OUT

VCTL

LNA VDD2

RFA IN

IFA VDD

LNA VDD1

LOA VDD

LNA IN

LNA OUT

LOA IN

RFA VDD

IFA OUT

VCTL

LNA VDD2

RFA IN

IFA VDD

LNA VDD1

Part

Value

Purpose

10 pF

LNA Input Matching

1.2 pF

LNA Input Matching

0.1 µF

LNA Source Bypass

C4, C5, C6, C9

0.1 µF

RF Bypass

0.1 µF

IF Bypass

6.8 pF

IF Matching

6.2 nH

LNA Matching

47 nH

IF Output Matching

120 nH

IF Mixer Matching

Optional Resistor to

increase LNA IIP3

3000 Ohms

Voltage Control Resistor

External Circuitry Parts List
(Korean Band PCS)

Parameter

Absolute Maximum

Voltage

6 V

Input Power

0 dBm

Operating Temperature

-30°C to +85°C

Storage Temperature

-65°C to +150°C

PCS LNA/Downconverter, 1800 - 2000 MHz

MADCSM0012

V 1.00

M/A-COM Inc. and its affiliates reserve the right to make changes to the product(s)
or information contained herein without notice.

Visit www.macom.com for additional data sheets and product information.

North America: Tel. (800) 366-2266

Asia/Pacific: Tel.+81-44-844-8296, Fax +81-44-844-8298

Europe: Tel. +44 (1344) 869 595, Fax+44 (1344) 300 020

Recommended PCB Configuration

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.

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.

PCS LNA/Downconverter, 1800 - 2000 MHz

MADCSM0012

V 1.00

M/A-COM Inc. and its affiliates reserve the right to make changes to the product(s)
or information contained herein without notice.

Visit www.macom.com for additional data sheets and product information.

North America: Tel. (800) 366-2266

Asia/Pacific: Tel.+81-44-844-8296, Fax +81-44-844-8298

Europe: Tel. +44 (1344) 869 595, Fax+44 (1344) 300 020

Typical Performance Curves vs. Temperature

LNA Output Return Loss

LNA Gain

LNA Input Return Loss

LNA Input IP3

LNA Noise Figure

1840

1845

1850

1855

1860

1865

1870

Frequency (MHz)

Gain

-30°C

+25°C

+85°C

-20

-15

-10

-5

1840

1845

1850

1855

1860

1865

1870

Frequency (MHz)

-30°C

+25°C

+85°C

-20

-15

-10

-5

1840

1845

1850

1855

1860

1865

1870

Frequency (MHz)

-30°C

+25°C

+85°C

1840

1845

1850

1855

1860

1865

1870

Frequency (MHz)

-30°C

+25°C

+85°C

0.0

0.5

1.0

1.5

2.0

2.5

1840

1845

1850

1855

1860

1865

1870

Frequency (MHz)

-30°C

+25°C

+85°C

Full Chain Conversion Gain

1840

1845

1850

1855

1860

1865

1870

Frequency (MHz)

-30°C

+25°C

+85°C

PCS LNA/Downconverter, 1800 - 2000 MHz

MADCSM0012

V 1.00

M/A-COM Inc. and its affiliates reserve the right to make changes to the product(s)
or information contained herein without notice.

Visit www.macom.com for additional data sheets and product information.

North America: Tel. (800) 366-2266

Asia/Pacific: Tel.+81-44-844-8296, Fax +81-44-844-8298

Europe: Tel. +44 (1344) 869 595, Fax+44 (1344) 300 020

Typical Performance Curves vs. Temperature

Full Chain Noise Figure

Full Chain Input IP3

Full Chain IF Return Loss

Full Chain LO Return Loss

Full Chain Port to Port Isolation

1840

1845

1850

1855

1860

1865

1870

Frequency (MHz)

-30°C

+25°C

+85°C

-14

-12

-10

-8

-6

1840

1845

1850

1855

1860

1865

1870

Frequency (MHz)

-30°C

+25°C

+85°C

-30

-25

-20

-15

-10

-5

150

175

200

225

250

275

300

Frequency (MHz)

-30°C

+25°C

+85°C

-30

-25

-20

-15

-10

-5

1200

1400

1600

1800

2000

2200

Frequency (MHz)

-30°C

+25°C

+85°C

1840

1845

1850

1855

1860

1865

1870

Frequency (MHz)

I
s
ol

ati

on (dB

)

LO-to-IF

LO-to-RF

RF-to-IF

RF-to-LO

Full Chain Conversion Gain vs. V

CTL

1840

1845

1850

1855

1860

1865

1870

Frequency MHz)

1.0 V

2.0 V

3.0 V

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