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Preliminary
RF2642
3V 900MHZ UPCONVERTER/ DRIVER AMPLIFIER WITH BYPASS MODE
6
Typical Applications
* CDMA/AMPS Cellular Systems * TDMA/AMPS Cellular Systems
* General Purpose Upconverter/Driver * Portable Battery-Powered Equipment
Product Description
3.75 0.45 0.28 0.75 0.50
2 0.80 TYP 1
1
The RF2642 is a complete upconverter and power amplifier driver designed for CDMA applications. The design features driver amplifier high and low gain states. In the low gain state, the gain is adjustable and the device draws less current. The upconverter is always on. The power down mode turns off the driver amplifier. The device features balanced IF inputs, single-ended LO input and RF output for ease of interface. Packaged in an industry standard 4mmx4mm, 16-pin, leadless chip carrier, the device provides a low-cost solution while easing board space limitations.
3.75
+
1.60 4.00
6
12 1.50 SQ INDEX AREA 3 3.20 4.00 1.00 0.90 0.75 0.65
NOTES:
1 Shaded Pin is Lead 1. 2 Dimension applies to plated terminal and is measured between 0.10 mm and 0.25 mm from terminal tip.
0.05 0.00
Dimensions in mm.
The terminal #1 identifier and terminal numbering convention 3 shall conform to JESD 95-1 SPP-012. Details of terminal #1 identifier are optional, but must be located within the zone indicated. The identifier may be either a mold or marked feature. 4 5 Pins 1 and 9 are fused. Package Warpage: 0.05 max.
Optimum Technology Matching(R) Applied
Package Style: LCC, 16-Pin, 4x4
GAIN SELECT
uSi Bi-CMOS
GND
Si BJT
GaAs HBT SiGe HBT
GaAs MESFET Si CMOS
Features
* Single Supply 3.0V Operation * Step Gain Control * Power Down Control * ACPR1=61dBc@885kHz with
VCC
LO+
1
16
15
14
13
RF OUT RF GND2 RF GND1
2 3 4
Logic Control
12 11 10
LO-
GND IF+ IF-
POUT =+5dBm * Small Leadless LCC 16-Pin Package
5 VPA1
6 RF IN
7 PD
8 MIX OUT
9 GND
Ordering Information
RF2642 RF2642 PCBA 3V 900MHz Upconverter/ Driver Amplifier with Bypass Mode Fully Assembled Evaluation Board Tel (336) 664 1233 Fax (336) 664 0454 http://www.rfmd.com
Functional Block Diagram
RF Micro Devices, Inc. 7625 Thorndike Road Greensboro, NC 27409, USA
Rev A2 010720
6-49
MIXERS
RF2642
Absolute Maximum Ratings Parameter
Supply Voltage Input RF Power Operating Ambient Temperature Storage Temperature
Preliminary
Rating
-0.5 to +4.5 +3 -30 to +85 -30 to +150
Unit
VDC dBm C C
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).
Parameter
Overall
RF Output Frequency Range IF Frequency Range Output Power
Specification Min. Typ. Max.
824 to 849 130 +5 33 34.5 12 250 1.5 52 61 78 80 36 14 2:1
Unit
Condition
T=25C, VCC =3.0V, RFOUT =830MHz, LO=960MHz@-3dBm, IF=130MHz
MHz MHz dBm dB dB
High Gain Mode
CW GAIN SELECT=2.7V, VPD =2.7V
6
MIXERS
Gain Noise Figure IF Input Impedance RF Output VSWR Current Consumption Adjacent Channel Power Rejection (ACPR1) Alternate Channel Power Rejection (ACPR2)
Differential @ 130MHz 824MHz to 849MHz, external components required POUT =+5dBm, 885kHz offset POUT =+5dBm, 1.98MHz offset GAIN SELECT=0V, VPD =2.7V
55 65
mA dBc dBc
Bypass Mode
Gain Noise Figure IF Input Impedance RF Output VSWR Output IP3 Current Consumption -4 11.9 11.9 250 1.5 +5.4 26 954 to 979 -3 50 -33 1.4 1.7 3.0 14 2:1 dBm mA dB dB
Differential @ 130MHz 824MHz to 849MHz, external components required
LO Input
LO Frequency Range LO Level LO Input Impedance LO to Mixer RF Output Leakage LO Input VSWR -6 0 -20 2:1 2:1 3.3 15 MHz dBm dBm
954MHz to 979MHz
GAIN SELECT=0V GAIN SELECT=2.7V V mA
Power Supply
Voltage Current Consumption 2.7 VPD =0V
NOTE: The measured results do not include the losses from the IF balun and SAW filter. On the evaluation board, those losses are as follows: IF Balun=1dB, SAW Filter=2.5dB to 3.5dB.
6-50
Rev A2 010720
Preliminary
Pin 1 2 Function GND RF OUT Description
Ground connection. For best performance, keep traces physically short and connect immediately to ground plane. This pin is internally connected to the die flag. Output match of the second stage of the power amplifier driver. This amplifier output pin is open collector. It is matched to 50 externally using a simple LC match. Refer to the application schematic.
RF2642
Interface Schematic
Gain Select RF OUT
3
RF GND2
4
RF GND1
5 6
VPA1 RF IN
The ground connection for the first stage of the power amplifier driver. The inductance between this pin and the ground plane determines the gain of the first stage. Increased inductance results in reduced gain. On the evaluation board, the emitter ground inductance is set by the length of the PCB trace connected between this pin and the ground. By sliding a 0 ground jumper along this line, the inductance, and hence the gain, may be varied. The evaluation board is shipped with the 0 jumper far away from the part, resulting in maximum inductance, and therefore minimum first stage gain. More gain may be obtained by shifting the 0 jumper toward the part. A maximum total gain of 40dB may be achieved if the first stage is set to minimum emitter inductor trace length. Power supply pin for the first stage power amplifier. External components provide tuning for the interstage match. RF input to the power amplifier. This input is DC-coupled, so an external blocking capacitor is needed if the pin is connected to a DC path.
See pin 3.
Bias
VPA1
RF IN
7
PD
8
MIX OUT
Power Down control When this pin is low, the amplifier section of the IC is shut off. When this pin is high, the amplifier section of the IC is turned on. The upconverter portion of the IC remains on regardless of the state of PD. Output for the upconverting mixer. This input is DC-coupled, so an external blocking capacitor is needed if the pin is connected to a DC path. The output impedance is 50.
MIX OUT
9
GND
Same as pin 1.
Rev A2 010720
6-51
MIXERS
The ground connection for the second stage of the power amplifier driver. The inductance between this pin and the ground plane determines the gain of the second stage. Increased inductance results in reduced gain. On the evaluation board, the emitter ground inductance is set by the length of the PCB trace connected between this pin and the ground. By sliding a 0 ground jumper along this line, the inductance, and hence the gain, may be varied. The evaluation board is shipped with the 0 jumper very close to the part, resulting in minimum inductance, and therefore maximum second stage gain. This translates to higher output IP3 and maximum ACPR1. This setting results in performance 6dB better than the ACPR1 minimum specification of 50dBc in the CDMA IS-95 specification for a POUT =+5dBm.
PCB Trace
6
RF2642
Pin 10 Function IFDescription
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 singleended input operation, one pin is used as an input and the other IF input is AC coupled to ground. The input impedance is 250 in both the balanced and single-ended modes.
IF+
Preliminary
Interface Schematic
IF-
BIAS
11 12 13
IF+ GND LO-
Same as pin 10, except complementary input. Ground connection. For best performance, keep traces physically short and connect immediately to ground plane. 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 singleended input operation, one pin is used as an input and the other LO input is AC coupled to ground. The input impedance is 50 in both the balanced and single-ended modes.
LO+
LO-
BIAS
6
MIXERS
14 15 16
LO+ VCC GAIN SELECT
Same as pin 13, except complementary input. Supply voltage for all bias circuits and logic circuits. When GAIN SELECT is high: the driver amplifier is switched to high gain mode; both amplifier stages are active; the gain is maximized; and, the entire device draws approximately 51mA. When GAIN SELECT is low, the second stage of the PA driver is turned off and bypassed. This results in a device current of 26mA, which is approximately a 50% current reduction. The upconverting mixer remains on in both the high and low gain modes to prevent VCO pulling. Ground connection. The backside of the package should be soldered to a top side ground pad which is connected to the ground plane with multiple vias.
Pkg Base
GND
PD
0 0 1 1
Gain Select
0 1 0 1
Mixer
ON ON ON ON
Amplifier First Stage
OFF OFF ACTIVE ACTIVE
Amplifier Second Stage
OFF OFF BYPASSED ACTIVE
Gain (dB)*
11.9 34.5
*See parameter specifications for conditions.
6-52
Rev A2 010720
Preliminary
Evaluation Board Schematic
(Download Bill of Materials from www.rfmd.com.)
NOTE: 1. R1, R2 and R8 are optional. 2. R4, R5 and R6 form T-attenuator with a loss of 1 dB. For 0 dB loss, R4 and R6 are removed, and R5 is a 0 short. 3. R3 and R7 are normally open. 4. FLT BP recommended is a Murata filter: SAFC836.5MC90T-TC12. 5. The microstrip on pin 4 is bridged to ground via 0 0402 size resistor. The recommended setting is at maximum of PCB. 6. The microstrip on pin 3 is bridged to ground via 0 resistor. The recommended setting is at a distance of 35 mils from edge of device. 7. *DNI: Do Not Install R8* DNI C1 1 nF
RF2642
C10 VCC 10 nF Gain Select C11 1 nF
50 strip
J5 LO IN
J1 PA OUT
50 strip
L4 3.9 nH
C9 10 nF 1 16 15 14 13
C12 1 nF
L1 8.2 nH VPA2 C2 10 nF P1 1 2 P1-3 3 CON3 P2 P2-1 1 2 P2-3 3 CON3 P3 P3-1 1 2 P3-3 3 CON3 VPA1 GND VPA2 J2 PA IN 50 strip Gain Select GND VCC VPA1 C3 10 nF R2* DNI strip See Note 5 R10 0 GND PD See Note 6 R9 0 R1* DNI strip 2 3 4
Logic Control
12 11 10 C8 1 nF
2642400B
T1 TRANS6 C7 1 nF
50 strip
J4 IF IN
6
MIXERS
5
6
7
8
9
L2 8.2 nH
C5 10 nF
PD
R5 5.1 R4 820 R6 820
FL1 FLT BP
C4 1 nF R3* DNI
C6 1 nF R7* DNI
50 strip
J3 MIX OUT
See Note 2
Rev A2 010720
6-53
RF2642
Evaluation Board Layout Board Size 2.981" x 2.981"
Board Thickness 0.031", Board Material FR-4
Preliminary
6
MIXERS
6-54
Rev A2 010720
Preliminary
RF2642
6
MIXERS
Rev A2 010720
6-55
RF2642
LO to RF Leakage for Upconverter Mixer Alone
-20.0
Preliminary
ACPR1 and ACPR2 versus LO Drive at VCC=3.0V for Upconverter + PA Driver at High Gain Mode
90.0 80.0 70.0 60.0 50.0 50.0 40.0 40.0 30.0 30.0 20.0 ACPR2, 1.98 MHz (dBc) 10.0 ACPR1, 880KHz (dBc) 0.0 -10.0 20.0 10.0 0.0 -9.0 -8.0 -7.0 -6.0 -5.0 -4.0 -3.0 -2.0 -1.0 0.0
-25.0 80.0
-30.0
ACPR2 Offset Freq of 1.98 MHz
70.0 60.0
-35.0
-40.0
-45.0
-50.0 -10.0
-9.0
-8.0
-7.0
-6.0
-5.0
-4.0
-3.0
-2.0
-1.0
0.0
LO Drive (dBm)
6
40.0
LO Drive (dBm)
Gain and Noise Figure versus LO Drive at VCC=3.0V for Upconverter + PA Driver at High Gain Mode
16.0
Gain and Noise Figure versus LO Drive at VCC=3.0V for Upconverter + PA Driver at Low Gain Mode
MIXERS
35.0
14.0
Gain and Noise Figure (dB)
25.0
Gain and Noise Figure (dB)
30.0
12.0
10.0
20.0
8.0
15.0
6.0
10.0
4.0
5.0
Gain (dB) Noise Figure (dB)
2.0
Gain (dB) Noise Figure (dB)
0.0 -10.0
-9.0
-8.0
-7.0
-6.0
-5.0
-4.0
-3.0
-2.0
-1.0
0.0
0.0 -10.0
-9.0
-8.0
-7.0
-6.0
-5.0
-4.0
-3.0
-2.0
-1.0
0.0
LO Drive (dBm)
LO Drive (dBm)
8.0
Output IP3 versus Drive Level at VCC=3.0V for Upconverter + PA Driver at Low Gain Mode
7.5
7.0
Output IP3 (dBm)
6.5
6.0
5.5
5.0
4.5
4.0 -10.0
-9.0
-8.0
-7.0
-6.0
-5.0
-4.0
-3.0
-2.0
-1.0
0.0
LO Drive (dBm)
6-56
Rev A2 010720
ACPR1 Offset Freq of 880 kHz
LO to RF Leakage (dBm)

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