C2304
..
DATA SHEET
MMDS / ISM / S-Band Downconverter
1800 to 4800 MHz Operation
Features
1800 to 4800 MHz RF
10 to 900 MHz IF
26 dB Gain, 4dB Noise Figure
Single 5V Supply
27 dBm Output IP3
Separate RF AMP, MIXER/LO AMP and IF AMP cells.
75 ohm IF output impedance
Applications
2.4 GHz ISM Band Applications
MMDS Downconverters
Wireless Bridges
Wireless Local Loop Systems
S Band Receivers
Wireless LANS and WANS
Point to Multipoint Receivers
2.4GHz Consumer Applications
Bluetooth Applications
Upconverters
Description
The C2304 is a flexible high intercept and high gain down conversion GaAs MMIC packaged in a compact 14
pin SOIC package. Each sub-circuit is brought out on separate pins to allow for custom filtering on the IF/RF
mixer interstage or custom matching for specific bands. Broadband parallel feedback networks are used on the
gain and LO driver stages and the mixer is a singly balanced, two diode type mixer. The FET source of the IF
amplifier stage (IF BIAS) is accessible for AC bypassing which allows for current reduction with DC source
degeneration. The gain and DC current is broken up as follows: RF AMP gain = 14dB, current = 22 mA; LO
AMP gain = 11dB, current = 28ma; IF AMP gain = 18dB, current = 60 mA, MIXER conversion loss = -6dB.
Simple external matching circuits can be implemented for all ports to achieve VSWR's <2:1 over moderate
bandwidths of less than 400MHz.
Electrical Characteristics
Typical Specifications for V
DD
=5.0V T
A
=+25
o
C
Minimum and Maximum specifications are guaranteed over RF range 2.5GHz 2.68GHz
Tested in 50
input / 75
output system, LO=2.278GHz at 5dBm, using matching circuit shown on page 3.
Parameter
Symbol
Conditions
Min
Typ
Max
Units
Conversion Gain
G
LO=5dBm
24.7
26
27.3
dB
Single Sideband Noise Figure
NF
LO=2.278GHz
4
dB
Output IP3
IP3
LO=5dBm
27
dBm
RF Input Return Loss
S
11
50
input ref.
-12
dB
IF Output Return Loss
S
22
75
output ref.
-11
dB
LO IN
RF IN
IF OUT
VDD
RF OUT
IF/RF
IF IN
IF BIAS
Pacific Wireless
2844 Mar Vista Dr. Suite 101
Aptos, CA 95003
TEL (831) 684-2474
FAX (831) 684-2494
www.pacwireless.com
C2304
Specifications Subject to Change Without Notice C2304Spec
Rev 6 12/30/99
Page 2
LO Input Return Loss
S
11
50
input ref.
-2
dBm
Output Power at 1dB Comp.
P
1dB
LO=5dBm
17
dBm
Operating Drain Current
I
DD
110
mA
RF OUT to IF/RF Isolation
ISO
r-i
LO=5dBm
32
dB
LO IN to IF OUT Isolation
ISO
l-i
LO=5dBm
13
dB
LO IN to RF IN Isolation
ISO
l-r
LO=5dBm
24
DB
Load VSWR for Input/Output
Stability
1
VSWR
With network on page 3
10:1
Thermal Resistance
JC
Junction to GND lead
75
C/W
1
As a separate circuit the IF AMP is conditionally stable for VSWR < 5:1 over 1.5-3.6GHz
Typical Performance Characteristics
(Obtained using external circuit shown on p. 3)
Absolute Maximum Ratings
Characteristic
Symbol
Value
Units
Drain Voltage
V
DD1,2
+8
V
Bias Current
I
DS
200
mA
RF Input Power
P
IN
+18
dBm
Power Dissipation
P
DISS
1.0
W
Load VSWR
VSWR
10:1
Operating Temperature
T
OP
-40 to +85
C
Junction Temperature
T
J
150
C
Storage Temperature Range
T
STG
-65 to +150
C
Caution: Operating beyond specified rating for any of these parameters may cause permanent damage to the device.
Conversion Gain and Output IP3 vs. LO Power
F1=2.59 GHz and F2=2.596 GHz
16
18
20
22
24
26
28
-6
-4
-2
0
2
4
6
8
10
LO Power (dBm)
Gain (dB), IP3 (dBm)
IP3
Conv. gain
Conversion Gain vs. Temperature
LO = 2.278GHz @ 5dBm
22
23
24
25
26
27
28
29
30
2.45
2.5
2.55
2.6
2.65
2.7
RF Freq (GHz)
Gain (dB)
+25C
+85C
-40C
IF Output Return Loss in 75 ohms
LO = 5dBm
-25
-20
-15
-10
-5
0
200
220
240
260
280
300
320
340
360
380
400
420
Freq (MHz)
Return Loss (dB)
RF Input Return Loss and RFOUT to IF/RF Isolation
-35
-30
-25
-20
-15
-10
-5
0
2.5
2.55
2.6
2.65
2.7
Freq (GHz)
Return Loss , Isolation (dB)
RF Input Return loss
RFout to RF/IF Isolation
C2304
Specifications Subject to Change Without Notice C2304Spec
Rev 6 12/30/99
Page 3
Application Information
PM2117
C2304
1
2
3
4
5
6
7
8
9
10
11
12
13
14
VDD
+5V
LO IN
RFIN
VDD
IF AMP
+5V
IF OUT
C2
C8
C3
C4
C7
C6
C5
TRL2
TRL3
TRL1
L1
L2
C9
Matching/Diplexing Circuit for 2.5 to 2.68 GHz Operation.
Recommended LO IN Port Matching
The LO IN port of the C2304 can be matched into 50 ohms with a lossy network. At 3dBm drive, the
unmatched port is at Z = 5 15j ohms at 2.278 GHz. Also of note is that this impedance varies somewhat with
the LO drive level. Therefore a narrow band high Q network is not recommended due to inherent
manufacturing variation in LO drive available. The simple network below matches this port over an ~ 10%
bandwidth.
LO IN
Pin 2
C1
TRL 1
R1
LO Source
50 ohm
Test Board Layout
VDD
IF AMP
LO IN
RF IN
VDD
IF OUT
C230X
Part
Value/Type
Size
C5
33pF NPO
0603
C2
1pF NPO
0603
C3
0.5pF NPO
0603
C4,C9
0.1uF X7R
0603
C6
1.8pF NPO
0603
C7
270 pF NPO
0603
C8
1000pF X7R
0603
L1
39 nH
0805
L2
560 nH
1008
TRL1
= 30
, Z
0
=110
@2.5GHz
TRL2
= 23
, Z
0
=110
@2.5GHz
TRL3
= 28
, Z
0
=110
@2.5GHz
Part
Value/Type
Size
C1
1.8pF NPO
0603
R1
4.3
0603
TRL1
= 21
, Z
0
=110
@2.5GHz
Material : GETEK
.028"
Biasing and Electrical Ground/
Thermal Considerations
Pins 3,4,5,10 and 12 should have ground vias straddling
both sides of the pin solder contact. This insures good
electrical and thermal grounding. If the IF AMP is run at
I
dss
(DC Grounded IF BIAS pin 14), this pin should be
grounded as described above. It is recommended that a
continuous ground plane be present under the package
to lower pin impedance and maintain similarity with the
matching environment used in the schematic in the
Application Information section. Bias for the IF amplifier
is supplied thru IF OUT pin 14. All ports are DC coupled
to the IC. Pins 2,6 and 13 should be kept at 0V DC to
maintain proper gate voltages. Pin 9 is internally biased
at 5V under normal operation and requires an external DC
block.
C2304
Specifications Subject to Change Without Notice C2304Spec
Rev 6 12/30/99
Page 4
Package Specifications
Notes:
Standard packaging is 14L SOIC tube. Tape and Reel available
upon request.
All shipments F.O.B. Pacific Wireless Aptos, CA 95003
Part Numbers:
Part Number
Description
C2304
1800 to 4800 Downconverter Tube
C2304TR
1800 to 4800 Downconverter Tape and Reel
For further information contact:
Pacific Wireless
2844 Mar Vista Dr. Suite 101
Aptos, CA 95003
TEL (831) 684-2474
FAX (831) 684-2494
www.pacwireless.com
Pin Number
Function
1
IF OUT
2
LO IN
3
GND
4
GND
5
GND
6
RF IN
7
VDD
8
GND
9
RFOUT
10
GND
11
IF/RF
12
GND
13
IF IN
14
IF BIAS
Advantages of GaAs MMIC
RF Integration Less Components/Board Space
Good Device Matching No Tweaks Less Tuning
Great power efficiency at low voltage
Better Linearity and Distortion Performance
Superb Radiation Immunity
No Latent or Cummulative ESD effects
No Infant Mortality; No "Walking Wounded"
No Burn-in Necessary
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