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6-1
6
MIXERS
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 MESFETGaAs HBT
Si Bi-CMOS
SiGe HBT
Si 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 s ection of dual-mode CDMA/FM cellular
applications. It is designed to downconvert RF signals
while providing 13dB gain in CDMA mode, and 7 dB 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 process 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 EvaluationBoard
6
Rev B6 010717
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
0°MIN
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
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6-2
RF2456
Rev B6 010717
6
MIXERS
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= 25°C, VCC=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, 1kΩ balanced load.
5 7 dB IF2, 870 Ω 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 70to 100 M Hz With external IF interface network
Output Impedance >1 kΩ IF1, balanced, open collector
870 Ω 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 µA Power down (PD=0)
Caution! ESD sensitive device.
RF Micro Devices believes thefurnished 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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6-3
RF2456
Rev B6 010717
6
MIXERS
Pin Funct ion Description Interface Schematic
1VCC
Supply Voltage for the mixers, bias circuits, and control logic. E xternal
RF and IF bypassing is required. The trace length between the pin and
the bypass capacitors should be minimized. T he ground side of the
bypass capacitors should connect immediately to ground plane.
2IF2-
Same as pin 3, except complimentary output. For typical single ended
operation, this pin is connected directly to V
CC
.
See pin 3.
3IF2+
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 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, is about 870Ω 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.
4GND
Ground connection. For best performance, keep traces physically short
and connect immediately to ground plane.
5IF1+
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
1kΩ, even though the part is designed to drive a 1kΩ load. Because
thispinisbiasedtoV
CC
, a DC blocking capacitor must be used if the IF
filter input has a DC path to ground. See Application Schematic.
6IF1-
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 50µA when selected.
8PD
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.
9LOIN+
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 presen t. External matching
network sets RF and IF impedance for optimum performance.
13 BYP
Internal voltage reference. External RF and IF bypassing is requi red.
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.
L
OOUT
VCC2
BIAS
IF2-IF2+
2.1 k
Ω
8.5 pF
IF1-IF1+
1.2pF1.2
pF
GND2
C1
50 k
Ω
PD
50 k
Ω
LO IN+ LO IN-
MIX IN
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RF2456
Rev B6 010717
6
MIXERS
Applicatio n Schematic
Evaluation Board Schema t ic
(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 nF1 µF
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 Ω
C2
10 pF
R1
33 Ω
R2
68 Ω
C8
33 pF
50 Ωµstrip
J1
RF IN
50 Ωµstrip
J4
LO IN
VCC
50 Ωµstrip
J2
FM IF2
50 Ωµstrip
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 Ωµstrip
J5
L8*
TBD
R4
220 Ω
C3
9pF
L2
390 nH
C4
9pF
C5
33 nF
C10
1uF
+
L3
3.3 uH
VCC
L4
3.3 uH
VCC
NOTE:
**Core: Fair-Rite Balun #2865002402
L12: 3turns#30 AWG (Green)
L34: 12turns#32 AWG (Red)
One turn = One pass through BOTH holes winding starts and finishes on same end of core.
L12 and L34 exitoppositeendsof core.
2
31
F1*
DNI
GND
OUT IN
0
0
1
1
Enable
0
1
0
1
IF Select
Off
Off
FM
CDMA
Stage
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RF2456
Rev B6 010717
6
MIXERS
Evaluation Board Layout
Board Size 3.070" X 2.928"
Board Thickness 0.056”, Board Material FR-4
Page 6
6-6
RF2456
Rev B6 010717
6
MIXERS
Page 7
6-7
RF2456
Rev B6 010717
6
MIXERS
FM Gain versus Temperature overFrequency,
VCC=3V,LO=-3dBm
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
CDMAGain versusTemperature over Frequency,
VCC=3V,LO=-3dBm
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)
CDMAGain@ T=-40
CDMAGain@ T=26
CDMA Gain@T=85
CDMA IIP3versus Temperature overFrequency,
VCC=3V,LO=-3dBm
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)
CDMAiIP3@ T=-40
CDMAiIP3@ T=26
CDMAiIP3@ T= 85
FM IIP3 versus Temperature over Frequency,
VCC=3V,LO=-3dBm
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,
VCC= 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 Gainversus Temperature over LO,
VCC= 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)
CDMAGain@ T=-40
CDMAGain@ T=26
CDMAGain@ T= 85
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RF2456
Rev B6 010717
6
MIXERS
CDMAIIP3versusTemperatureoverLO,
VCC= 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)
CDMAiIP3@ T=-40
CDMAiIP3@ T=26
CDMAiIP3@ T=85
FM IIP3 versus Temperature over LO,
VCC= 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 VCC,
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
2.72.82.93.03.13.23.33.43.53.63.73.83.94.0
VCC(V)
Gain (dB)
FM Gain @ T=-40
FM Gain @ T=26
FM Gain @ T= 85
CDMAGain versusTemperature over VCC,
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
VCC(V)
Gain (dB)
CDMAGain@ T=-40
CDMAGain@ T=26
CDMAGain@ T= 85
CDMA IIP3versus Temperature over VCC,
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
2.72.82.93.03.13.23.33.43.53.63.73.83.94.0
VCC(V)
IIP3 (dBm)
CDMAiIP3@ T=-40
CDMAiIP3@ T=26
CDMAiIP3@ T=85
FM IIP3 versus Temperature overVCC,
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
VCC(V)
IIP3 (dBm)
FM iIP3 @ T=-40
FM iIP3 @ T=26
FM iIP3 @ T= 85
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