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6-1
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
5
6
7
8
16
15
14
13
12
11
10
9
VCC
FM-
FM+
GND
CDMA+
CDMA-
IF SELECT
PD
GND
GND
GND
BYP
MIXER IN
GND
LO-
LO+
RF2456
CDMA/FM DOWNCONVERTER
CDMA/FM Cellular Systems
Supports Dual-Mode AMPS/CDMA
Supports Dual-Mode TACS/CDMA
General Purpose Downconverter
Commercial and Consumer Systems
Portable Battery-Powered Equipment
The RF2456 is a receiver dual downconverter designed
for the receive section of dual-mode CDMA/FM cellular
applications. It is designed to downconvert RF signals
while providing 13dB gain in CDMA mode, and 7dB gain
in FM mode. It also features digital control of IF output
selection and power down mode. Noise Figure, IP3, and
other specs are designed to be compatible with the IS-95
Interim Standard for CDMA cellular communications. The
IC is manufactured on an advanced Silicon Bipolar pro-
cess and packaged in an SSOP-16.
Dual Mode CDMA/AMPS
Dual Mode JCDMA/TACS
Digitally Selectable IF Outputs
500MHz to 1100MHz Operation
Power Down Mode
RF2456
CDMA/FM Downconverter
RF2456 PCBA
Fully Assembled Evaluation Board
0
Rev B7 021008
0.157
0.150
0.025
0.012
0.008
0.196
0.189
0.2440
0.2284
0.0688
0.0532
0.050
0.016
0.0098
0.0075
8 MAX
0MIN
NOTES:
1. Shaded lead is Pin 1.
2. All dimensions are excluding mold flash.
3. Lead coplanarity - 0.005 with respect to datum "A".
-A-
0.0098
0.0040
Package Style: SSOP-16
NOT FOR NEW DESIGNS
See Upgraded Product RF2461
!
6-2
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Absolute Maximum Ratings
Parameter
Rating
Unit
Supply Voltage
-0.5 to +5.0
V
DC
Input LO and RF Levels
+6
dBm
Operating Ambient Temperature
-40 to +85
C
Storage Temperature
-40 to +150
C
Parameter
Specification
Unit
Condition
Min.
Typ.
Max.
Overall
T = 25C, V
CC
=3.0V, RF=881MHz,
LO=966MHz @ 0dBm, IF1= CDMA,
IF2=FM
RF Frequency Range
200 to 1000
MHz
LO Frequency Range
500 to 1100
MHz
IF Frequency Range
0.1 to 250
MHz
Conversion Gain
12.5
13.0
dB
IF1, 1k
balanced load.
5
7
dB
IF2, 870
load.
Noise Figure
12
dB
IF1 single sideband.
13
dB
IF2 single sideband
Input VSWR
<1.5:1
IF1 with external matching
<2:1
IF2 with external matching
Input IP3
+3.0
+3.5
dBm
IF1
+3.0
+10.0
dBm
IF2
Input P1dB
-7
dBm
IF1
-4
dBm
IF2
MIX IN to IF1, IF2 Rejection
35
dB
IF1, IF2 Output Freq. Range
70 to 100
MHz
With external IF interface network
Output Impedance
>1
k
IF1, balanced, open collector
870
IF2, single ended, with external inductor.
LO Input
LO Input Range
-10
-3
0
dBm
LO IN to RF Input Rejection
20
dB
LO IN to IF1, IF2 Rejection
15
dB
LO Input VSWR
<2:1
IF1 with external matching network
2.5
IF2 with external matching network
Power Supply
Voltage
2.7
3.0
4.0
V
Current Consumption
18
21
mA
IF1 selected
15
16
mA
IF2 selected
5
A
Power down (PD=0)
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).
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Pin
Function
Description
Interface Schematic
1
VCC
Supply Voltage for the mixers, bias circuits, and control logic. External
RF 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.
2
IF2-
Same as pin 3, except complimentary output. For typical single ended
operation, this pin is connected directly to V
CC
.
See pin 3.
3
IF2+
FM IF Output pin. This is a balanced output, but is typically used as a
single-ended output. The internal circuitry, in conjunction with an exter-
nal matching/bias inductor to V
CC
, sets the operating impedance. This
inductor is typically incorporated in the matching network between the
output and IF filter. The net output impedance, including the external
inductor, is about 870
at 85MHz. Because this pin is biased to V
CC
, a
DC blocking capacitor must be used if the IF filter input has a DC path
to ground. See Application Schematic.
4
GND
Ground connection. For best performance, keep traces physically short
and connect immediately to ground plane.
5
IF 1+
CDMA IF Output pin. This is a balanced output. The internal circuitry, in
conjunction with an external matching/bias inductor to V
CC
, sets the
operating impedance. This inductor is typically incorporated in the
matching network between the output and IF filter. The net output
impedance, including the external inductor, at 85MHz is higher than
1k
, even though the part is designed to drive a 1k
load. Because
this pin is biased to V
CC
, a DC blocking capacitor must be used if the IF
filter input has a DC path to ground. See Application Schematic.
6
IF 1-
Same as pin 5, except complementary output.
See pin 5.
7
IF SELECT
Control line for IF out select. A logic "low" enables the FM output. A
logic "high" enables the CDMA output. The threshold voltage is 1.6V,
and the pin draws less than 50
A when selected.
8
PD
Power down pin. A logic "low" turns the part off. A logic "high" (>1.6V)
turns the part on. In addition, pin 7 (IF SELECT) should also be taken
low during power down.
9
LO IN+
Mixer LO Balanced Input Pin. For single-ended input operation, this pin
is used as an input and pin 10 is bypassed to ground.
10
LO IN-
Same as pin 9 except complementary input.
See pin 9.
11
GND
Ground connection for the mixer. For best performance, keep traces
physically short and connect immediately to ground plane.
12
MIX IN
Mixer RF Input Pin. This pin is internally DC biased and should be DC
blocked if connected to a device with DC present. External matching
network sets RF and IF impedance for optimum performance.
13
BYP
Internal voltage reference. External RF 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.
14
GND
Same as pin 4.
15
GND
Same as pin 4.
16
GND
Same as pin 4.
LO OUT
VCC2
BIAS
IF2-
IF2+
2.1 k
8.5 pF
IF1-
IF1+
1.2
pF
1.2
pF
GND2
C1
50 k
PD
50 k
LO IN+
LO IN-
MIX IN
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Application Schematic
Evaluation Board Schematic
(Download Bill of Materials from www.rfmd.com.)
33 nF
33 nF
15 nH
LO IN
IF SELECT
33 nF
5.6 nH
3.3 pF
15 nH
L
L
L
CDMA SAW Filter
33 nF
1
F
FM SAW Filter
L
CDMA IF OUT
FM IF OUT
V
CC
PD
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
MIX IN
C9
33 nF
C6
33 nF
L5
8.2 nH
C7
1.5 pF
L6
15 nH
C1
33 nF
L1
150 nH
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
2456400 Rev A
T1
**XFMER
R3
10
C2
10 pF
R1
33
R2
68
C8
33 pF
50
strip
J1
RF IN
50
strip
J4
LO IN
VCC
50
strip
J2
FM IF2
50
strip
J3
CDMA IF1
IF SELECT
ENABLE
P2
1
2
3
P2-3
ENABLE
GND
P2-1
IF SELECT
GND
P1-1
VCC
P1
1
2
3
L7
15 nH
50
strip
J5
L8*
TBD
R4
220
C3
9 pF
L2
390 nH
C4
9 pF
C5
33 nF
C10
1 uF
+
L3
3.3 uH
VCC
L4
3.3 uH
VCC
NOTE:
**Core: Fair-Rite Balun #2865002402
L12: 3 turns #30 AWG (Green)
L34: 12 turns #32 AWG (Red)
One turn = One pass through BOTH holes winding starts and finishes on same end of core.
L12 and L34 exit opposite ends of core.
2
31
F1*
DNI
GND
OU
T
I
N
0
0
1
1
Enable
0
1
0
1
IF Select
Off
Off
FM
CDMA
Stage
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Evaluation Board Layout
Board Size 3.070" X 2.928"
Board Thickness 0.056", Board Material FR-4
6-6
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FM Gain versus Temperature over Frequency,
V
CC
= 3 V, LO = -3 dBm
5.4
5.6
5.8
6.0
6.2
6.4
6.6
6.8
869.0
874.0
879.0
884.0
889.0
894.0
Frequency (MHz)
Gain (dB)
FM Gain @ T=-40
FM Gain @ T=26
FM Gain @ T= 85
CDMA Gain versus Temperature over Frequency,
V
CC
= 3V, LO = -3 dBm
13.0
13.1
13.2
13.3
13.4
13.5
13.6
13.7
869.0
874.0
879.0
884.0
889.0
894.0
Frequency (MHz)
Gain (dB)
CDMA Gain @ T=-40
CDMA Gain @ T=26
CDMA Gain @ T= 85
CDMA IIP3 versus Temperature over Frequency,
V
CC
= 3 V, LO = -3 dBm
3.0
4.0
5.0
6.0
7.0
8.0
9.0
869.0
874.0
879.0
884.0
889.0
894.0
Frequency (MHz)
IIP3 (dBm)
CDMA iIP3 @ T=-40
CDMA iIP3 @ T=26
CDMA iIP3 @ T= 85
FM IIP3 versus Temperature over Frequency,
V
CC
= 3 V, LO = -3 dBm
7.0
7.5
8.0
8.5
9.0
9.5
10.0
10.5
11.0
11.5
869.0
874.0
879.0
884.0
889.0
894.0
Frequency (MHz)
IIP3 (dBm)
FM iIP3 @ T=-40
FM iIP3 @ T=26
FM iIP3 @ T= 85
FM Gain versus Temperature over LO,
V
CC
= 3 V, Frequency = 881 MHz
5.0
5.2
5.4
5.6
5.8
6.0
6.2
6.4
6.6
-6.0
-5.0
-4.0
-3.0
-2.0
-1.0
0.0
Frequency (MHz)
Gain (dB)
FM Gain @ T=-40
FM Gain @ T=26
FM Gain @ T= 85
CDMA Gain versus Temperature over LO,
V
CC
= 3 V, Frequency = 881 MHz
13.0
13.1
13.2
13.3
13.4
13.5
13.6
13.7
13.8
13.9
14.0
-6.0
-5.0
-4.0
-3.0
-2.0
-1.0
0.0
LO (dBm)
Gain (dB)
CDMA Gain @ T=-40
CDMA Gain @ T=26
CDMA Gain @ T= 85
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CDMA IIP3 versus Temperature over LO,
V
CC
= 3 V, Frequency = 881 MHz
-3.0
-2.0
-1.0
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
-6.0
-5.0
-4.0
-3.0
-2.0
-1.0
0.0
LO (dBm)
IIP3 (dBm)
CDMA iIP3 @ T=-40
CDMA iIP3 @ T=26
CDMA iIP3 @ T= 85
FM IIP3 versus Temperature over LO,
V
CC
= 3 V, Frequency = 881 MHz
8.0
8.5
9.0
9.5
10.0
10.5
11.0
11.5
12.0
-6.0
-5.0
-4.0
-3.0
-2.0
-1.0
0.0
LO (dBm)
IIP3 (dBm)
FM iIP3 @ T=-40
FM iIP3 @ T=26
FM iIP3 @ T= 85
FM Gain versus Temperature over V
CC
,
Frequency = 881 MHz, LO = -3 dBm
5.5
5.6
5.7
5.8
5.9
6.0
6.1
6.2
6.3
6.4
6.5
2.7
2.8
2.9
3.0
3.1
3.2
3.3
3.4
3.5
3.6
3.7
3.8
3.9
4.0
V
CC
(V)
Gain (dB)
FM Gain @ T=-40
FM Gain @ T=26
FM Gain @ T= 85
CDMA Gain versus Temperature over V
CC
,
Frequency = 881 MHz, LO = -3 dBm
13.0
13.1
13.2
13.3
13.4
13.5
13.6
13.7
2.7
2.8
2.9
3.0
3.1
3.2
3.3
3.4
3.5
3.6
3.7
3.8
3.9
4.0
V
CC
(V)
Gain (dB)
CDMA Gain @ T=-40
CDMA Gain @ T=26
CDMA Gain @ T= 85
CDMA IIP3 versus Temperature over V
CC
,
Frequency = 881 MHz, LO = -3 dBm
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
2.7
2.8
2.9
3.0
3.1
3.2
3.3
3.4
3.5
3.6
3.7
3.8
3.9
4.0
V
CC
(V)
IIP3 (dBm)
CDMA iIP3 @ T=-40
CDMA iIP3 @ T=26
CDMA iIP3 @ T= 85
FM IIP3 versus Temperature over V
CC
,
Frequency = 881 MHz, LO = -3 dBm
6.0
7.0
8.0
9.0
10.0
11.0
12.0
2.7
2.8
2.9
3.0
3.1
3.2
3.3
3.4
3.5
3.6
3.7
3.8
3.9
4.0
V
CC
(V)
IIP3 (dBm)
FM iIP3 @ T=-40
FM iIP3 @ T=26
FM iIP3 @ T= 85
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