MD59-0021
PCS CDMA LNA / Downconverter
1.8—
1.8 — 2.0 GHz
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 IP
3
Low LO Drive Level -10 dBm
Operates in US and Korean PCS Bands
Miniature TSSOP-16 Plastic Package
TSSOP-16 Plastic Package
1
(.039)
(1)
Pin 16
.041/.031
1,05/,80
.252
6,4
.177/.169
4,5/4,3
Pin 1
.0256
0,65
.201/.193
5,1/4,9
Exposed
Pad
.118
3,0
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.
.118
3,0
1. Dimensions are: in / mm
Ordering Information
Part Number
MD59-0021TR
MD59-0021RTR
MD59-0021SMB
1.
Package
Forward Tape and Reel
1
Reverse Tape and Reel
1
Sample Board
If specific reel size is required, consult factory for part number
assignment.
Electrical Specifications T
A
= 25°C, V
DD
= 3.0V, RF = 1.9 GHz, LO = 1.69 GHz
Parameter
Low Noise Amplifier
Gain
Noise Figure
VSWR In/Out
Input IP
3
I
DD
Complete DownConverter
1
Conversion Gain
Noise Figure
Input IP
3
LO-to-RF Isolation
LO-to-IF Isolation
I
DD
IF = 210 MHz
RF = 1.9 GHz
LO = 1.69 GHz, LO Level = -10 dBm
dB
dB
dBm
dB
dB
mA
22.5
2.7
-12
50
24
32
25.4
dBm
mA
Frequency = 1.9 GHz
dB
dB
14
1.8
2:1
+6
13
Test Conditions
Units
Min.
Typ.
Max.
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
PIN No.
PIN
Description
LO V
DD
MD59-0021
Block Diagrams
RFA IN
1
2
3
4
LO V
DD
LO In
GND
IF Out
LO Amplifier Supply Voltage. RF bypassing required.
Local Oscillator Input (-10 to -7 dBm) (DC blocked)
DC and RF ground
GND
GND
LO IN
RFA V
DD
IF Output and Downconverter - must be externally
matched to input impedance of IF Filter.
IF OUT
IF BYP
5
IF Match
Matching between I FA and Mixer - requires an inductor
to ground.
IF MATCH
GND
6
7
8
9
GND
DC and RF ground
GND
LNA V
DD
2
LNA V
DD
1 LNA Stage 1 supply voltage. RF bypassing required.
LNA In
RF Input to LNA. External matching required.
LNA SRC Source of LNA output stage FET. RF bypassing
required. Off-chip resistor may be used to increase IP
3
.
LNA Out
50Ω==Output of LNA. (DC Blocked)
LNA V
DD
1
LNA OUT
10
11
12
13
LNA IN
LNA SRC1
LNA V
DD
2 LNA Stage 2 supply voltage. RF bypassing required.
GND
IF BYP
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)
14
15
16
GND
RFA V
DD
RFA In
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
C6, C10, C11, C14
C2, C5, C7, C12, C13, C15-
C17
C3
C1, C4
C8
C9
L1
L2
L3
R1
U1
MD59-0021
Recommended PCB Configuration
Value
33 pF
1000 pF
15 pF
10 pF
1.5 pF
100 pF
27 nH
72 nH
6.8 nH
R
bias
RF Bypass
Purpose
RF / IF Bypass
IF Matching
Bypass, IF Matching
LNA Input Matching
RF Bypass
IF Matching
IF Amplifier Input Matching
LNA Input Matching
Optional resistor to increase bias
current in LNA
MD59-00021
LNA/Downconverter
Cross Section View
RF Traces +
Components
RF
Ground
DC
Routing
U2
J1
Saw
Filter
DC
Connect
Filter TX signals and image
10 PIN DC Connector
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
V
DD
= 2.8V, 3.0V, 3.3V, LO = -10dBm
25
24
23
GAIN (dB)
22
21
20
19
18
1.8
1.82
1.84
1.86
1.88
1.9
1.92
1.94
1.96
1.98
2
RF FREQUENCY (GHz)
2.8V
3.0V
3.3V
Conversion Gain vs. Frequency
LO = -10 dBm, -5 dBm, V
DD
= 3.0V
25
24
GAIN (dB)
23
22
21
20
19
18
1.8
1.82
1.84
1.86
1.88
1.9
1.92
1.94
1.96
1.98
2
RF FREQUENCY (GHz)
-10 dBm
-5 dBm
Noise Figure vs. Frequency
V
DD
= 2.8V, 3.0V, 3.3V, LO = -10dBm
3.6
3.4
3.2
3
2.8
2.6
2.4
2.2
2
1.8
3.6
NOISE FIGURE (dB)
3.4
3.2
3
2.8
2.6
2.4
2.2
2
Noise Figure vs. Frequency
LO = -10dBm, -5dBm, V
DD
= 3.0V
NOISE FIGURE (dB)
2.8V
-10dBm
3.0V
3.3V
-5dBm
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 IP
3
vs. Frequency
V
DD
= 2.8V, 3.0V, 3.3V, LO = -10dBm
-9
-9.5
-10
IIP
3
(dBm)
-10.5
-11
-12
-12.5
-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
2.8V
3.0V
3.3V
Input IP
3
vs. Frequency
LO = -10dBm, -5dBm, V
DD
= 3.0V
-9
-9.5
-10
IIP
3
(dBm)
-10.5
-11
-11.5
-12
-12.5
-13
1.8
1.82
1.84 1.86 1.88 1.9 1.92 1.94 1.96
RF FREQUENCY (GHz)
1.98
2
-10dBm
-5dBm
-11.5
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) Cont’d)
LO Input Return Loss vs. Frequency
LO = -10dBm, V
DD
= 3.0V
10
5
0
-5
-10
-15
-20
-25
-30
-35
-40
1.4
1.45
1.5
1.55
1.6
1.65
1.7
1.75
1.8
1.85
1.9
LO FREQUENCY (GHz)
IF Output Return Loss vs. Frequency
LO = -10dBm, V
DD
= 3.0V
10
5
0
-5
-10
-15
-20
-25
-30
-35
-40
0.1
0.12
0.14
0.16
0.18
0.2
0.22
0.24
0.26
0.28
0.3
IF FREQUENCY (GHz)
RETURN LOSS (dB)
RETURN LOSS (dB)
Downconverter Input Return Loss vs.
Frequency LO = -10dBm, V
DD
= 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
RF FREQUENCY (GHz)
2
2.05
2.1
16
14
GAIN / NF (dB)
12
10
8
6
4
2
0
1.8
LNA Gain, Noise Figure vs. Frequency
V
DD
= 3.0V
RETURN LOSS (dB)
Gain
NF
1.82
1.84
1.86
1.88
1.9
1.92
1.94
1.96
1.98
2
RF FREQUENCY (GHz)
LNA Input IP
3
vs. Frequency
V
DD
= 2.8V, 3.0V, 3.3V
11
3.3V
LNA Input Return Loss vs. Frequency
V
DD
= 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)
RETURN LOSS (dB)
10
IIP
3
(dBm)
9
8
7
6
5
1.8
1.82
1.84
1.86
1.88
1.9
1.92
1.94
1.96
1.98
2
RF FREQUENCY (GHz)
3.0V
2.8V
LNA Output Return Loss vs. Frequency
V
DD
= 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.
RETURN LOSS (dB)
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
