MA-COM MD59

MD59-0021
PCS CDMA LNA / Downconverter
1.8—
1.8 — 2.0 GHz
TSSOP-16 Plastic Package1
Features
•
•
•
•
•
•
•
•
High Integrated LNA and Downconverter
Operates over 2.7 V to 5V Supply Voltage
Low Noise Figure < 2.7 dB
High Input Intercept Point -12 dBm
Optional Control of LNA IP3
Low LO Drive Level -10 dBm
Operates in US and Korean PCS Bands
Miniature TSSOP-16 Plastic Package
(.039)
(1)
.041/.031
1,05/,80
Pin 16
.177/.169
4,5/4,3
.252
6,4
.118
3,0
Pin 1
.0256
0,65
Description
M/A-COM’s MD59-0021 is a fully integrated downconverter IC
with LNA, RF amplifier, downconverting mixer, IF amplifier
and LO buffer amplifier in a miniature TSSOP-16 plastic
package with exposed metal lead frame backside for improved
high frequency grounding.
The MD59-0021 is ideally suited for CDMA handset
applications where wide dynamic range and low power
consumption are important receiver requirements.
The MD59-0021 is fabricated using a M/A-COM’s 0.5 micron
low noise E/D GaAs MESFET process. The process features
full passivation for increased performance and reliability.
.201/.193
5,1/4,9
.118
3,0
Exposed
Pad
1. Dimensions are: in / mm
Ordering Information
Part Number
Package
MD59-0021TR
Forward Tape and Reel1
MD59-0021RTR
Reverse Tape and Reel1
MD59-0021SMB
Sample Board
1.
If specific reel size is required, consult factory for part number
assignment.
Electrical Specifications TA = 25°C, VDD = 3.0V, RF = 1.9 GHz, LO = 1.69 GHz
Parameter
Test Conditions
Units
Min.
Typ.
Max.
Low Noise Amplifier
Gain
Frequency = 1.9 GHz
Noise Figure
dB
14
dB
1.8
VSWR In/Out
2:1
Input IP3
dBm
+6
mA
13
dB
22.5
dB
2.7
dBm
-12
LO-to-RF Isolation
dB
50
LO-to-IF Isolation
dB
24
mA
32
IDD
Complete DownConverter
1
Conversion Gain
Noise Figure
RF = 1.9 GHz
Input IP3
LO = 1.69 GHz, LO Level = -10 dBm
IDD
IF = 210 MHz
25.4
1. Complete downconverter measurements taken with 3 dB pad between LNA output and RFA input.
Specifications subject to change without notice.
V 2.0
North America: Tel. (800) 366-2266, Fax (800) 618-8883
Asia/Pacific: Tel.+81-44-844-8296, Fax +81-44-844-8298
Europe: Tel. +44 (1344) 869 595, Fax+44 (1344) 300 020
Visit www.macom.com for additional data sheets and product information.
PCS CDMA LNA / Downconverter, 1.8—2.0 GHz
Pin Configuration
Block Diagrams
PIN No.
PIN
1
LO VDD
2
LO In
Local Oscillator Input (-10 to -7 dBm) (DC blocked)
3
GND
DC and RF ground
4
IF Out
IF Output and Downconverter - must be externally
matched to input impedance of IF Filter.
5
IF Match
6
GND
7
8
Description
LNA Out
11
LNA VDD2 LNA Stage 2 supply voltage. RF bypassing required.
GND
14
GND
15
RFA VDD
16
RFA In
RFA V DD
GND
GND
IF OUT
IF BYP
IF MATCH
GND
GND
LNA V DD 2
LNA V DD1
LNA OUT
LNA IN
LNA SRC1
RF Input to LNA. External matching required.
10
IF BYP
LO IN
DC and RF ground
LNA SRC Source of LNA output stage FET. RF bypassing
required. Off-chip resistor may be used to increase IP3.
13
RFA IN
Matching between I FA and Mixer - requires an inductor
to ground.
9
12
LO V DD
LO Amplifier Supply Voltage. RF bypassing required.
LNA VDD1 LNA Stage 1 supply voltage. RF bypassing required.
LNA In
MD59-0021
50Ω==Output of LNA. (DC Blocked)
DC and RF ground.
IF Bypass of Mixer. Required DC block and RF/IF
ground.
DC and RF ground
RFA supply voltage. RF bypassing required.
50Ω==Input of RFA. (DC blocking required)
Sample Board Schematic
1
J1
1. Saw filter characteristics to be determined by customer, depending on band of operation. Sample boards are supplied with 3 dB pi pad installed in
place of saw filter, to emulate typical worst case loss. Data supplied with sample board is measured over US PCS1900 Rx Band.
Specifications subject to change without notice.
V 2.0
North America: Tel. (800) 366-2266, Fax (800) 618-8883
Asia/Pacific: Tel.+81-44-844-8296, Fax +81-44-844-8298
Europe: Tel. +44 (1344) 869 595, Fax+44 (1344) 300 020
Visit www.macom.com for additional data sheets and product information.
PCS CDMA LNA / Downconverter, 1.8—2.0 GHz
External Circuitry Parts List
Ref. Designation
Value
C6, C10, C11, C14
33 pF
C2, C5, C7, C12, C13, C15C17
1000 pF
Recommended PCB Configuration
Purpose
RF Bypass
RF / IF Bypass
C3
15 pF
IF Matching
C1, C4
10 pF
Bypass, IF Matching
C8
1.5 pF
LNA Input Matching
C9
100 pF
RF Bypass
L1
27 nH
IF Matching
L2
72 nH
IF Amplifier Input Matching
L3
6.8 nH
LNA Input Matching
R1
Rbias
U1
Optional resistor to increase bias
current in LNA
MD59-00021
LNA/Downconverter
U2
Saw
Filter
J1
DC
Connect
MD59-0021
Filter TX signals and image
10 PIN DC Connector
Cross Section View
RF Traces +
Components
RF
Ground
DC
Routing
Operating Instructions
The MD59-0021 is a highly integrated MMIC downconverter
for the 1.8-2 GHz PCS 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 light
weight battery operated portable radio systems.
The receive chain consists of an LNA, RFA, balanced mixer and
single-ended IF output buffer amplifier as shown in the block
diagram. Surface mount resistors, inductors and capacitors are
used in conjunction with the IC for optimum performance,
tunability and ease of use. A schematic showing the IC and
required external components is shown on the previous page.
The input of the LNA is matched externally with a series
inductor (L3) and a shunt capacitor (C8) to provide a low loss
match to the optimum noise impedance in the band of interest.
A high Q inductor such as Coilcraft’s 0603CS series must be
used if the specified noise figures are to be achieved. The series
capacitor C9 is a DC blocking capacitor whose value is not
critical (it should be ≥ 100pF) The LNA is nominally biased
with 13 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 50Ω input and output impedance.
The mixer is a balanced resistive FET mixer which provides
exceptional linearity and isolation with low loss and no DC
current. An off-chip inductor, L, is required to match the output
of the mixer to the input of the IF buffer amplifier.
Customer
The IF output port is the open drain of the IF buffer amplifier.
This allows maximum flexibility of intermediate frequency and
also IF filter characteristics. A matching network such as that
shown on page 2 can be used to match from the output
impedance of the buffer to the input impedance of the filter at
the required frequency. The inductor also acts as a choke for the
DC supply line.
The LO input port is internally matched to 50Ω. 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 -5 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 C1,
C6, C11 and C14 are RF bypass capacitors for the LNA, RFA
and LOA. The value and placement of these capacitors are
critical in determining the frequency response of these
amplifiers. Capacitor C10 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 shown in the
PCB drawing shown above. Capacitors C2, C5, C7, C12, C13
and C15 are 1000 pF low frequency DC supply bypass
capacitors. Their value and placement are less critical than the
other capacitors. However, for best results, these capacitors
should be located as close to the package leads as possible.
Specifications subject to change without notice.
V 2.0
North America: Tel. (800) 366-2266, Fax (800) 618-8883
Asia/Pacific: Tel.+81-44-844-8296, Fax +81-44-844-8298
Europe: Tel. +44 (1344) 869 595, Fax+44 (1344) 300 020
Visit www.macom.com for additional data sheets and product information.
PCS CDMA LNA / Downconverter, 1.8—2.0 GHz
MD59-0021
Typical Performance Curves LNA/Downconverter (with 3dB Pad in place of Image Reject Filter)
Conversion Gain vs. Frequency
VDD = 2.8V, 3.0V, 3.3V, LO = -10dBm
Conversion Gain vs. Frequency
LO = -10 dBm, -5 dBm, VDD = 3.0V
25
25
24
24
3.3V
22
2.8V
21
3.0V
-5 dBm
23
GAIN (dB)
GAIN (dB)
23
22
21
20
20
19
19
-10 dBm
18
18
1.8
1.82
1.84
1.86
1.88
1.9
1.92
1.94
1.96
1.98
1.8
2
1.82
1.84
1.86
1.92
1.94
1.96
1.98
2
3.6
3.6
3.4
3.2
3
2.8
2.6
2.4
2.2
2
NOISE FIGURE (dB)
NOISE FIGURE (dB)
1.9
Noise Figure vs. Frequency
LO = -10dBm, -5dBm, VDD = 3.0V
Noise Figure vs. Frequency
VDD = 2.8V, 3.0V, 3.3V, LO = -10dBm
2.8V
3.3V
3.0V
3.4
3.2
-10dBm
3
2.8
2.6
2.4
-5dBm
2.2
2
1.8
1.82 1.84 1.86 1.88 1.9 1.92 1.94 1.96 1.98
RF FREQUENCY (GHz)
2
1.8
1.82
1.84
1.86
1.88
1.9
1.92
1.94
1.96
1.98
2
RF FREQUENCY (GHz)
Input IP3 vs. Frequency
VDD = 2.8V, 3.0V, 3.3V, LO = -10dBm
Input IP3 vs. Frequency
LO = -10dBm, -5dBm, VDD = 3.0V
-9
-9
-9.5
-9.5
-10
-10
IIP3 (dBm)
IIP3 (dBm)
1.88
RF FREQUENCY (GHz)
RF FREQUENCY (GHz)
-10.5
-11
-11.5
-12
-10.5
-5dBm
-11
-11.5
-12
2.8V
-12.5
3.0V
-10dBm
-12.5
3.3V
-13
-13
1.8
1.82 1.84 1.86 1.88 1.9 1.92 1.94 1.96 1.98
RF FREQUENCY (GHz)
2
1.8
1.82
1.84 1.86 1.88 1.9 1.92 1.94 1.96
RF FREQUENCY (GHz)
1.98
Specifications subject to change without notice.
V 2.0
North America: Tel. (800) 366-2266, Fax (800) 618-8883
Asia/Pacific: Tel.+81-44-844-8296, Fax +81-44-844-8298
Europe: Tel. +44 (1344) 869 595, Fax+44 (1344) 300 020
Visit www.macom.com for additional data sheets and product information.
2
PCS CDMA LNA / Downconverter, 1.8—2.0 GHz
MD59-0021
Typical Performance Curves LNA/Downconverter (with 3dB Pad in place of Image Reject Filter) Cont’d)
IF Output Return Loss vs. Frequency
LO = -10dBm, VDD = 3.0V
10
5
0
-5
-10
-15
-20
-25
-30
-35
-40
RETURN LOSS (dB)
RETURN LOSS (dB)
LO Input Return Loss vs. Frequency
LO = -10dBm, VDD = 3.0V
1.4
1.45
1.5
1.55
1.6
1.65
1.7
1.75
1.8
1.85
10
5
0
-5
-10
-15
-20
-25
-30
-35
-40
0.1
1.9
0.12
0.14
0.16
0.18
0.22
0.24
0.26
0.28
0.3
1.98
2
2.05
2.1
LNA Gain, Noise Figure vs. Frequency
VDD = 3.0V
10
5
0
-5
-10
-15
-20
-25
-30
-35
-40
16
14
GAIN / NF (dB)
RETURN LOSS (dB)
Downconverter Input Return Loss vs.
Frequency LO = -10dBm, VDD = 3.0V
12
Gain
10
8
6
NF
4
2
0
1.6
1.65
1.7
1.75 1.8 1.85 1.9 1.95
RF FREQUENCY (GHz)
2
2.05
2.1
1.8
RETURN LOSS (dB)
10
3.3V
9
8
7
3.0V
2.8V
5
1.8
1.82
1.84
1.86
1.88
1.9
1.92
1.84
1.86
1.88
1.9
1.92
1.94
1.96
LNA Input Return Loss vs. Frequency
VDD = 3.0V
11
6
1.82
RF FREQUENCY (GHz)
LNA Input IP3 vs. Frequency
VDD = 2.8V, 3.0V, 3.3V
IIP3 (dBm)
0.2
IF FREQUENCY (GHz)
LO FREQUENCY (GHz)
1.94
1.96
1.98
2
10
5
0
-5
-10
-15
-20
-25
-30
-35
-40
1.6
1.65
1.7
1.75
1.8
1.85
1.9
1.95
2
RF FREQUENCY (GHz)
RF FREQUENCY (GHz)
RETURN LOSS (dB)
LNA Output Return Loss vs. Frequency
VDD = 3.0V
10
5
0
-5
-10
-15
-20
-25
-30
-35
-40
1.6
1.65
1.7
1.75
1.8
1.85
1.9
1.95
2
2.05
2.1
RF FREQUENCY (GHz)
Specifications subject to change without notice.
V 2.0
North America: Tel. (800) 366-2266, Fax (800) 618-8883
Asia/Pacific: Tel.+81-44-844-8296, Fax +81-44-844-8298
Europe: Tel. +44 (1344) 869 595, Fax+44 (1344) 300 020
Visit www.macom.com for additional data sheets and product information.