6-27
Product Description
Ordering Information
Typical Applications
Features
Functional Block Diagram
RF Micro Devices, Inc.
7628 Thorndike Road
Greensboro, NC 27409, USA
Tel (336) 664 1233
Fax (336) 664 0454
http://www.rfmd.com
Optimum Technology Matching Applied
Si BJT
GaAs MESFET
GaAs HBT
Si Bi-CMOS
SiGe HBT
Si CMOS
InGaP/HBT
GaN HEMT
SiGe Bi-CMOS
1
2
3
4
8
7
6
5
IF-
IF+
BYP
LO-
RF OUT
VCC
GND
LO+
RF2638
W-CDMA AND CDMA UPCONVERTER/
BPSK MODULATOR
W-CDMA Systems
PCS/Cellular CDMA Systems
PHS 1500/WLAN 2400 Systems
General Purpose Upconverter
BPSK Modulation
Micro-Cell PCS Base Stations
The RF2638 is a complete upconverter designed for cel-
lular, PCS and W-CDMA applications. This device may
also be used to directly BPSK modulate a carrier. The
unit operates at 3.0V and is designed as part of the
RFMD PCS/Cellular CDMA and W-CDMA Chip Sets.
Supports Dual Mode Operation
+10dBm Output IP3 (1950MHz)
+13dBm Output IP3 (830MHz)
Single 3.0V Power Supply
Miniature 8-Pin Package
Double-Balanced Mixer
RF2638
W-CDMA and CDMA Upconverter/ BPSK Modulator
RF2638 PCBA-PCS/CELFully Assembled Evaluation Board
RF2638 PCBA-DOFully Assembled Evaluation Board
0
Rev B14 030102
NOTES:
1. Shaded lead is pin 1.
2. All dimensions are exclusive of
flash, protrusions or burrs.
3. Lead coplanarity: 0.002 with
respect to datum "A".
0.012
6 MAX
0 MIN
0.021
+ 0.004
0.006
+ 0.002
0.192
+ 0.008
0.0256
0.118
+ 0.004 sq.
0.006
+ 0.003
0.034
-A-
Package Style: MSOP-8
!
6-28
RF2638
Rev B14 030102
Absolute Maximum Ratings
Parameter
Rating
Unit
Supply Voltage
-0.5 to +5.0
V
DC
Input RF Power
+3
dBm
Operating Ambient Temperature
-30 to +80
C
Storage Temperature
-30 to +150
C
Parameter
Specification
Unit
Condition
Min.
Typ.
Max.
Overall
T=25C, V
CC
=3.0V
RF Output Frequency Range
500 to 2500
MHz
Spurious Product Rejection
30
dBc
Referenced to RF output
Cellular
T=25C, V
CC
=3.0V, LO=960MHz@-3dBm,
IF=130MHz@-13dBm
Conversion Gain
-1
-0.5
dB
RF
OUT
=830MHz
-2.2
-1
dB
RF
OUT
=836MHz (Dual-Output board)
Noise Figure
14
dB
RF
OUT
=830MHz
Output IP3
+13
dBm
P
IN
=-13dBm per Tone, RF out=830MHz
PCS
T=25C, V
CC
=3.0V,
LO=1750MHz@-3dBm,
IF=130MHz@-13dBm
Conversion Gain
-3.0
-1.5
dB
RF
OUT
=1880MHz
-3.5
-2.5
dB
RF
OUT
=1880MHz (Dual-Output board)
Noise Figure
15
dB
RF
OUT
=1880MHz
Output IP3
+7
+11
dBm
P
IN
=-13dBm per Tone, RF out=1880MHz
W-CDMA
T=25C, V
CC
=3.0V,
LO=2330MHz@-3dBm,
IF=380MHz@-13dBm
ACPR
-58
-57
-56
dBc
Conversion Gain
-2.0
-1.0
0
dB
RF
OUT
=1950MHz
Noise Figure
13
14
15
dB
RF
OUT
=1950MHz
Output IP3
+8
+10
dBm
P
IN
=-13dBm per Tone, RF
OUT
=1950MHz
Max OIP3
11
dBm
IF Input
IF Frequency
DC
130/380
500
MHz
Differential Input Impedance
220
260
300
IF=130MHz
IF to RF Output Isolation
30
dB
IF to LO Isolation
30
dB
LO Input
LO Frequency Range
300 to 2700
MHz
LO Level
-6 to 0
dBm
LO to RF Output Leakage
-18
-25
dBm
-15
-17
dBm
At Cellular band, high side injection
(Dual-Output board)
-14
-15
dBm
At PCS band, low side injection
(Dual-Output board)
RF to LO Isolation
30
dB
LO Input VSWR
2:1
50
Power Supply
Voltage
2.7
3.0
3.3
V
Current Consumption
25
mA
Caution! ESD sensitive device.
RF Micro Devices believes the furnished information is correct and accurate
at the time of this printing. However, RF Micro Devices reserves the right to
make changes to its products without notice. RF Micro Devices does not
assume responsibility for the use of the described product(s).
6-29
RF2638
Rev B14 030102
Pin
Function
Description
Interface Schematic
1
IF-
Balanced IF input pin. This pin is internally DC-biased and should be
DC-blocked if connected to a device with a DC level present. For single-
ended input operation, one pin is used as an input and the other IF
input is AC-coupled to ground. The balanced, input impedance is
260
.
2
IF+
Same as pin 1, except complementary input.
See pin 1.
3
BYP
Bypass pin for internal bias circuitry. Bypass with a 1nF capacitor.
4
LO-
Balanced LO input pin. This pin is internally DC-biased and should be
DC-blocked if connected to a device with a DC level present. For single-
ended input operation, one pin is used as an input and the other LO
input is AC-coupled to ground.
5
LO+
Same as pin 4, except complementary input.
See pin 4.
6
GND
Ground connection. For best performance, keep traces physically short
and connect immediately to ground plane.
7
VCC
Supply voltage pin. External bypassing is required. External RF, LO,
and IF bypassing is required. The trace length between the pin and the
bypass capacitors should be minimized. The ground side of the bypass
capacitors should connect immediately to ground plane.
8
RF OUT
RF output pin.
IF+
IF-
130
130
BIAS
BYP
LO+
LO-
BIAS
300
RF OUT
6-30
RF2638
Rev B14 030102
Application Schematic
836MHz
Application Schematic
1880MHz
RF OUT
IF-
IF+
LO
V
CC
1
2
3
4
8
7
6
5
12 nH
1 nF
1 nF
1 nF
22 pF
22 pF
10 nF
2 pF
V
CC
10 nF
RF OUT
IF-
IF+
LO
V
CC
1
2
3
4
8
7
6
5
2.7 nH
1 nF
1 nF
1 nF
5 pF
5 pF
10 nF
1.5 pF
V
CC
10 nF
6-31
RF2638
Rev B14 030102
Application Schematic
Dual-Band Output (836MHz/1880MHz)
Application Schematic
W-CDMA (1950MHz)
PCS OUT
IF-
IF+
LO
1
2
3
4
8
7
6
5
100 nH
1 nF
1 nF
1 nF
5 pF
5 pF
10 nF
0.5 pF
V
C
C
10 nF
6.8 nH
4 pF
5.6 nH
18 nH
CELL OUT
V
CC
W-CDMA OUT
IF-
IF+
LO
1
2
3
4
8
7
6
5
4.7 nH
1 nF
1 nF
1 nF
5 pF
5 pF
10 nF
9 pF
V
CC
10 nF
V
CC
PDF 
ZIP