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DATA SHEET
SKY77328 iPACTM PAM for Quad-Band GSM / GPRS
Applications
* Quad-band cellular handsets encompassing - Class 4 GSM850/900 - Class 1 DCS1800 PCS1900 - Class 12 GPRS multi-slot operation
Description
The SKY77328 Power Amplifier Module (PAM) is designed in a low profile (1.2 mm), compact form factor for quad-band cellular handsets comprising GSM850/900, DCS1800, and PCS1900 operation. The PAM also supports Class 12 General Packet Radio Service (GPRS) multi-slot operation. The module consists of separate GSM850/900 PA and DCS1800/PCS1900 PA blocks, impedancematching circuitry for 50 input and output impedances, and a Power Amplifier Control (PAC) block with an internal current-sense resistor. The custom BiCMOS integrated circuit provides the internal PAC function and interface circuitry. Fabricated onto a single Gallium Arsenide (GaAs) die, one Heterojunction Bipolar Transistor (HBT) PA block supports the GSM850/900 bands and the other supports the DCS1800 and PCS1900 bands. Both PA blocks share common power supply pins to distribute current. The GaAs die, the Silicon (Si) die, and the passive components are mounted on a multi-layer laminate substrate. The assembly is encapsulated with plastic overmold. RF input and output ports of the SKY77328 are internally matched to a 50 load to reduce the number of external components for a quad-band design. Extremely low leakage current (2.5 A, typical) of the dual PA module maximizes handset standby time. The SKY77328 also contains bandselect switching circuitry to select GSM (logic 0) or DCS/PCS (logic 1) as determined from the Band Select (BS) signal. In Figure 1 below, the BS pin selects the PA output (DCS/PCS OUT or GSM850/900 OUT) and the Analog Power Control (VAPC) controls the level of output power. The VBATT pin connects to an internal current-sense resistor and interfaces to an integrated power amplifier control (iPACTM) function, which is insensitive to variations in temperature, power supply, process, and input power. The ENABLE input allows initial turn-on of PAM circuitry to minimize battery drain.
Features
* Low input power range - 0 to 6 dBm * High efficiency - GSM850 56% - GSM900 56% - DCS 54% - PCS 53% * BiCMOS PA controller and interface IC - Low power control slope - Fast response time - Improved control accuracy * Integrated closed loop power amplifier control * Internal ICC sense resistor for PAC * Input/Output matching 50 internal (with DC blocking) * 20-pin package * Small outline - 6 mm x 6 mm * Low profile - 1.2 mm maximum * Gold plated, lead-free contacts * MSL3/250 C
Figure 1. Functional Block Diagram
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DATA SHEET
SKY77328 iPACTM PAM FOR QUAD-BAND GSM / GPRS
Electrical Specifications
The following tables list the electrical characteristics of the SKY77328 Power Amplifier Module. Table 1 lists the absolute maximum ratings and Table 2 shows the recommended operating conditions. Table 3 lists the electrical characteristics of the
SKY77328 for modes GSM850, GSM900, DCS1800, and PCS1900. Figure 2 is a diagram of a typical SKY77328 application. The SKY77328 is a static-sensitive electronic device and should not be stored or operated near strong electrostatic fields. Detailed information on device dimensions, pin descriptions, packaging and handling can be found in later sections of this data sheet.
Table 1. Absolute Maximum Ratings
Parameter Input Power (PIN) Supply Voltage (VCC), Standby, VAPC 0.3 V, ENABLE 0.2 V Control Voltage (VAPC) Storage Temperature Minimum -- -- Maximum 15 7 Unit dBm V
-0.5 -55
VCC_MAX - 0.2 (See Table 3) +150
V C
Table 2. Recommended Operating Conditions
Parameter Supply Voltage (VCC) Supply Current (ICC) Operating Case Temperature (Tcase) - Package Bottom Surface 1-Slot (12.5% duty cycle) 2-Slot (25.0% duty cycle) 3-Slot (37.5% duty cycle) 4-Slot (50.0% duty cycle) Minimum 2.9 0 -20 -20 -20 -20 Typical 3.5 -- -- -- -- -- Maximum 4.8 2.5 +100 +100 +85 +85 Unit V A C
Table 3. SKY77328 Electrical Specifications 1 (1 of 9)
General Parameter Supply Voltage Power Control Impedance ENABLE Control Voltage Low High ENABLE current Band Select Control Voltage Low High Band Select Current Standby Mode Leakage Current IBS IQ VBS 3.0 V VCC 4.5 V VAPC = 0.1 V ENABLE 0.2 V TCASE = +25 C PIN -60 dBm -- -- IPE VBS VPE 3.0 V -- -- VCC ZAPC VPE Symbol Test Condition -- -- -- -- Minimum 2.9 -- -0.1 1.2 -- -0.1 1.2 -- -- Typical 3.5 200 -- -- -- -- -- -- 2.5 Maximum 4.8 -- 0.6 VCC 30 0.6 VCC 30 10 A A A V Units V k V
VAPC Input Filter Bandwidth VAPC Threshold
VAPC FBW VAPC THCL
85 100
120 150
150 200
kHz mV
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SKY77328 iPACTM PAM FOR QUAD-BAND GSM / GPRS
DATA SHEET
Table 3. SKY77328 Electrical Specifications 1 (2 of 9)
GSM850 Mode ( = 824...849 MHz and PIN = 0...6dBm) Parameter Frequency Range Input Power Analog Power Control Vvoltage Power Added Efficiency F PIN VAPC PAE Symbol Test Condition -- -- -- VCC = 3.5 V POUT = 34.5 dBm ENABLE > 2.0 V pulse width 577 s duty cycle 1:8 TCASE = +25 C BW = 3 MHz 6.5 dBm POUT 34.5 dBm VCC = 3.5 V TCASE = +25 C VCC = 2.9 V ENABLE > 2.0 V TCASE = -20 C...+100 C (See Table 2 for multi-slot.) PIN = 0 dBm VCC = 4.5 V ENABLE > 2.0 V TCASE = -20 C...+100 C (See Table 2 for multi-slot.) PIN = 0 dBm POUT = 6.5...34.5 dBm, controlled by VAPC PIN = 6 dBm VAPC = 0.1 V ENABLE 0.2 V All combinations of the following parameters: VAPC = controlled (2) PIN = min....max. VCC = 2.9 V...4.8 V Load VSWR = 8:1, all phase angles Minimum 824 0 0.2 50 Typical 837 3 -- 56 Maximum 849 6 1.7 -- Units MHz dBm V %
2nd...13th Harmonics Output Power
20...130 POUT MAX POUT MAX LOW VOLTAGE
-- 34.5 32.0
-30 35.4 33.5
-10 -- --
dBm dBm
POUT MAX HIGH VOLTAGE
32.0
36.4
--
Input VSWR Forward Isolation
IN POUT STANDBY
-- --
1.5:1 -45
2.3:1 -35
-- -dBm
Spurious
Spur
No parasitic oscillation > -36 dBm
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DATA SHEET
SKY77328 iPACTM PAM FOR QUAD-BAND GSM / GPRS
Table 3. SKY77328 Electrical Specifications 1 (3 of 9)
GSM850 Mode ( = 824...849 MHz and PIN = 0...6dBm) [continued] Parameter Load Mismatch Load Symbol Test Condition All combinations of the following parameters: VAPC = controlled 2 PIN = min...max. VCC = 2.9 V...4.8 V Load VSWR = 10:1, all phase angles At 0 + 20 MHz RBW = 100 kHz VCC = 3.5 V 6.5 dBm POUT 34.5 dBm TCASE = +25 C At 1805...1880 MHz RBW = 100 kHz VCC = 3.5 V 6.5 dBm POUT 34.5 dBm TCASE = +25 C Coupling of Fundamental, 2nd, and 3rd Harmonics from the GSM Band into the DCS/PCS Band Power Control Dynamic Range Power Control Variation 4 (Control level 5-15) 3.2 VCC 4.5 Power Control Variation 4 (Control level 16-19) Power Control Slope PCS 0 20 30 PCDR PCV -- POUT +14.5...+34.5 dBm, +25 C POUT +14.5...+34.5 dBm POUT +6.5...+12.5 dBm, +25 C POUT +6.5...+12.5 dBm 6.5...34.5 dBm Measured at the DCS/PCS output -15 dBm POUT 34.5 dBm Minimum Typical Maximum Units
No module damage or permanent degradation
Noise Power
PNOISE
--
-84
-82
dBm
--
-106
-84
-- -- -- 30 -0.8 -1.3 -1.1 -1.7 --
-3 -23 -22 50 -- -- -- -- --
3 -15 -17
dBm
dB 0.8 1.3 1.1 1.7 150 dB/V dB
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DATA SHEET
Table 3. SKY77328 Electrical Specifications 1 (4 of 9)
GSM900 Mode ( = 880...915 MHz and PIN = 0...6 dBm) Parameter Frequency Range Input Power Analog Power Control Voltage Power Added Efficiency PIN VAPC PAE Symbol Test Condition -- -- -- VCC = 3.5 V POUT = 34.5 dBm ENABLE > 2.0 V pulse width 577 s duty cycle 1:8 TCASE = +25 C Minimum 880 0 0.2 50 Typical 900 3 -- 56 Maximum 915 6 1.7 -- Units MHz dBm V %
2nd...13th Harmonics
20...70, 90...130 BW = 3 MHz 6.5 dBm POUT 34.5 dBm 80 POUT MAX POUT MAX LOW VOLTAGE VCC = 3.5 V TCASE = +25 C VCC = 2.9 V ENABLE > 2.0 V TCASE = -20 C...+100 C (See Table 2 for multi-slot.) PIN = 0 dBm VCC = 4.5 V ENABLE > 2.0 V TCASE = -20 C...+100 C (See Table 2 for multi-slot.) PIN = 0 dBm POUT = 6.5...34.5 dBm, controlled by VAPC PIN = 6 dBm VAPC = 0.1 V ENABLE 0.2 V All combinations of the following parameters: VAPC = controlled 2 PIN = min...max. VCC = 2.9 V...4.8 V Load VSWR = 8:1, all phase angles
-- -- 34.5 32.0
-27 -15 35.1 33.3
-10 -5 -- --
dBm
Output Power
dBm
POUT MAX HIGH VOLTAGE
32.0
36.0
--
Input VSWR Forward Isolation
IN POUT STANDBY
-- --
1.5:1 -45
2.3:1 -35
-- dBm
Spurious
Spur
No parasitic oscillation > -36 dBm
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DATA SHEET
SKY77328 iPACTM PAM FOR QUAD-BAND GSM / GPRS
Table 3. SKY77328 Electrical Specifications 1 (5 of 9)
GSM900 Mode ( = 880...915 MHz and PIN = 0...6 dBm) [continued] Parameter Load Mismatch Load Symbol Test Condition All combinations of the following parameters: VAPC = controlled 2 PIN = min...max. VCC = 2.9 V...4.8 V Load VSWR = 10:1, all phase angles At 0 + 20 MHz RBW = 100 kHz VCC = 3.5 V 6.5 dBm POUT 34.5 dBm TCASE = +25 C At O + 10 MHz RBW = 100 kHz VCC = 3.5 V 6.5 dBm POUT 34.5 dBm TCASE = +25 C At 1805...1880 MHz RBW = 100 kHz VCC = 3.5 V 6.5 dBm POUT 34.5 dBm TCASE = +25 C Coupling of Fundamental, 2nd, and 3rd Harmonics from the GSM band into the DCS/PCS band Power Control dynamic range Power Control variation 4 (Control level 5-15) 3.2 VCC 4.5 Power Control variation 4 (Control level 16-19) Power Control slope PCS 0 2O 30 PCDR PCV -- POUT +14.5...+34.5 dBm, +25 C POUT +14.5...+34.5 dBm POUT +6.5...+12.5 dBm, +25 C POUT +6.5...+12.5 dBm 6.5...34.5 dBm Measured at the DCS/PCS output, -15 dBm POUT 34.5 dBm Minimum Typical Maximum Units
No module damage or permanent degradation
Noise Power
PNOISE
--
-84
-82
dBm
--
-81
-76
--
-106
-84
-- -- -- 30 -0.8 -1.3 -1.1 -1.7 --
-1 -25 -22 50 -- -- -- -- --
3 -17 -17 -- 0.8 1.3 1.1 1.7 150
dBm
dB dB
dB/V
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SKY77328 iPACTM PAM FOR QUAD-BAND GSM / GPRS
DATA SHEET
Table 3. SKY77328 Electrical Specifications 1 (6 of 9)
DCS1800 Mode ( = 1710...1785 MHz and PIN = 0...6 dBm) Parameter Frequency range Input Power Analog Power Control voltage Power Added Efficiency PIN VAPC PAE Symbol Test Condition -- -- -- VCC = 3.5 V POUT = 32.0 dBm ENABLE > 2.0 V pulse width 577 s duty cycle 1:8 TCASE = +25 C BW = 3 MHz 1.5 dBm POUT 32.0 dBm VCC = 3.5 V TCASE = +25 C VCC = 2.9 V ENABLE > 2.0 V TCASE = -20 C...+100 C (See Table 2 for multi-slot.) PIN = 0 dBm VCC = 4.5 V ENABLE > 2.0 V TCASE = -20 C...+100 C (See Table 2 for multi-slot.) PIN = 0 dBm POUT = 1.5...32.0 dBm, controlled by VAPC PIN = 6 dBm VAPC = 0.1 V ENABLE 0.2 V All combinations of the following parameters: VAPC = controlled 3 PIN = min...max. VCC = 2.9 V...4.8 V Load VSWR = 8:1, all phase angles Minimum 1710 0 0.2 48 Typical 1750 3 -- 54 Maximum 1785 6 1.7 -- Units MHz dBm V %
2nd...7th Harmonics Output Power
20...70 POUT MAX POUT MAX LOW VOLTAGE
-- 32.0 29.0
-30 33.2 31.4
-10 -- --
dBm dBm
POUT MAX HIGH
VOLTAGE
29.0
33.8
--
Input VSWR Forward isolation
IN POUT STANDBY
-- --
1.5:1 -40
2.0:1 -35
-- dBm
Spurious
Spur
No parasitic oscillation > -36 dBm
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DATA SHEET
SKY77328 iPACTM PAM FOR QUAD-BAND GSM / GPRS
Table 3. SKY77328 Electrical Specifications 1 (7 of 9)
DCS1800 Mode ( = 1710...1785 MHz and PIN = 0...6 dBm) [continued] Parameter Load Mismatch Load Symbol Test Condition All combinations of the following parameters: VAPC = controlled 3 PIN = min...max. VCC = 2.9 V...4.8 V Load VSWR = 10:1, all phase angles At 0 + 20 MHz RBW = 100 kHz VCC = 3.5 V 1.5 dBm POUT 32.0 dBm TCASE = +25 C At 925...960 MHz RBW = 100 kHz VCC = 3.5 V 1.5 dBm POUT 32.0 dBm TCASE = +25 C Power Control dynamic range Power Control variation 4 (Control level 0-8) 3.2 V VCC 4.5 V Power Control variation 4 (Control level 9-13) Power Control variation 4 (Control level 14-15) Power Control slope PCS PCDR PCV -- POUT +15.5...+32.0 dBm, +25 C POUT +15.5...+32.0 dBm POUT +5.5...+13.5 dBm, +25 C POUT +5.5...+13.5 dBm POUT +1.5...+3.5 dBm, +25 C POUT +1.5...+3.5 dBm 1.5...32.0 dBm Minimum Typical Maximum Units
No module damage or permanent degradation
Noise Power
PNOISE
--
-82
-80
dBm
--
-97
-87
35 -1.1 -2.0 -1.1 -3.4 -1.4 -4.0 --
50 -- -- -- -- -- -- --
-- 1.1 1.2 1.1 1.4 0.8 2.0 150
dB dB
dB/V
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SKY77328 iPACTM PAM FOR QUAD-BAND GSM / GPRS
DATA SHEET
Table 3. SKY77328 Electrical Specifications 1 (8 of 9)
PCS1900 Mode ( = 1850...1910 MHz and PIN = 0...6 dBm) Parameter Frequency range Input Power Analog Power Control voltage Power Added Efficiency F PIN VAPC PAE Symbol Test Condition -- -- -- VCC = 3.5 V POUT = 32.0 dBm ENABLE > 2.0 V pulse width 577 s duty cycle 1:8 TCASE = +25 C BW = 3 MHz 1.5 dBm POUT 32.0 dBm VCC = 3.5 V TCASE = +25 C VCC = 2.9 V ENABLE > 2.0 V TCASE = -20 C...+100 C (See Table 2 for multi-slot.) PIN = 0 dBm VCC = 4.5 V ENABLE > 2.0 V TCASE = -20 C...+100 C (See Table 2 for multi-slot.) PIN = 0 dBm POUT = 1.5...32.0 dBm, controlled by VAPC PIN = 6 dBm VAPC = 0.1 V ENABLE 0.2 V All combinations of the following parameters: VAPC = controlled 3 PIN = min...max. VCC = 2.9 V...4.8 V Load VSWR = 8:1, phase angles Minimum 1850 0 0.2 48 53 Typical 1880 3 Maximum 1910 6 1.7 -- Units MHz dBm V %
2nd...7th Harmonics Output Power
20...70 POUT MAX POUT MAX LOW VOLTAGE
-- 32.0 29.0
-35 32.9 31.2
-10 -- --
dBm dBm
POUT MAX HIGH VOLTAGE
29.0
33.7
--
Input VSWR Forward isolation
IN POUT STANDBY
-- --
1.5:1 -40
2.0:1 -35
-- dBm
Spurious
Spur
No parasitic oscillation > -36 dBm
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DATA SHEET
SKY77328 iPACTM PAM FOR QUAD-BAND GSM / GPRS
Table 3. SKY77328 Electrical Specifications 1 (9 of 9)
PCS1900 Mode ( = 1850...1910 MHz and PIN = 0...6 dBm) [continued] Parameter Load Mismatch Load Symbol Test Condition All combinations of the following parameters: VAPC = controlled 3 PIN = min...max. VCC = 2.9 V...4.8 V Load VSWR = 10:1, all phase angles At 0 + 20 MHz RBW = 100 kHz VCC = 3.5 V 1.5 dBm POUT 32.0 dBm TCASE = +25 C At 869...894 MHz RBW = 100 kHz VCC = 3.5 V 1.5 dBm POUT 32.0 dBm TCASE = +25 C Power Control dynamic range Power Control variation 4 (Control level 0-8) 3.2 V VCC 4.5 V Power Control variation 4 (Control level 9-13) Power Control variation 4 (Control level 14-15) Power Control slope
1
Minimum
Typical
Maximum
Units
No module damage or permanent degradation
Noise Power
PNOISE
--
-82
-80
dBm
--
-97
-87
PCDR PCV
-- POUT +15.5...+32.0 dBm, +25 C POUT +15.5...+32.0 dBm
35 -1.1 -2.0 -1.1 -3.4 -1.4 -4.0 --
50 -- -- -- -- -- -- --
-- 1.1 1.2 1.1 1.4 0.8 2.0 150
dB dB
PCV
POUT +5.5...+13.5 dBm, +25 C POUT +5.5...+13.5 dBm
dB
PCV
POUT +1.5...+3.5 dBm, +25 C POUT +1.5...+3.5 dBm
dB
PCS
1.5...32.0 dBm
dB/V
Unless specified otherwise: TCASE = -20 C to max. operating temperature (see Table 2) RL = 50 pulsed operation with pulse width 1154 s and duty cycle 2:8 VCC = 2.9 V...4.8 V. ICC = 0A to xA, where x = current at POUT = 34.5 dBm, 50 load, and VCC = 3.5 V. ICC = 0A to xA, where x = current at POUT = 32.0 dBm, 50 load, and VCC = 3.5 V. Power control variation is measured by comparing Power obtained at a specified control voltage over all conditions, against the power obtained with the same control voltage at nominal conditions. For this module, nominal conditions are defined as: T = 25 C VCC = 3.5 V PIN = 3 dBm Frequency = mid-band
2 3 4
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SKY77328 iPACTM PAM FOR QUAD-BAND GSM / GPRS
DATA SHEET
Figure 2. Typical SKY77328 PAM Application
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DATA SHEET
SKY77328 iPACTM PAM FOR QUAD-BAND GSM / GPRS
Package Dimensions
Figure 3 is a mechanical diagram of the pad layout for the SKY77328, a 20-pin leadless quad-band PA module. Figure 4 provides a recommended phone board layout footprint for the
PAM to help the designer attain optimum thermal conductivity, good grounding, and minimum RF discontinuity for the 50 ohm terminals.
Figure 3. SKY77328 PAM Package Dimensions--20-Pin Leadless (All Views)
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DATA SHEET
Figure 4. Phone Board Layout Footprint for 6 x 6 mm, 20-Pad SKY77328 Package
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DATA SHEET
SKY77328 iPACTM PAM FOR QUAD-BAND GSM / GPRS
Package Descriptions
Figure 5 shows the device pin configuration and Table 4 lists the pin names and signal descriptions. The pin numbering convention
starts with pin 1 at the upper left, as indicated in Figure 5, and increments counter-clockwise around the package. Figure 6 interprets typical case markings.
Figure 5. SKY77328 PAM Pin Configuration--20-Pin Leadless (Top View)
Figure 6. Typical Case Markings
Table 4. SKY77328 Pin Names and Signal Descriptions
Pin 1 1 2 3 4 6 11 15 16 17 18 20 BS VCC1A DCS/PCS_IN GSM_IN VCC1B GSM_OUT DCS/PCS_OUT GND VBATT ENABLE VAPC Name Band Select VCC (to GSM 1st stage, DCS/PCS 1st stages, BiCMOS PAC) RF input 1710-1910 MHz (DCS1800, PCS1900) RF input 824-915 MHz (GSM850/900) VCC (to GSM 2nd stage, DCS/PCS 2nd stages) RF Output 824-915 MHz (GSM850/900) RF Output 1710-1910 MHz (DCS1800, PCS1900) RF and DC Ground Battery input to high side of internal sense resistor BiCMOS Enable Power Control Bias Voltage Ground Pad, bottom Description
GND PAD (21) GND
1
Pads 5, 7-10, 12-14, 16 are Ground pads; pad 19 is a RSVD/GND pad
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SKY77328 iPACTM PAM FOR QUAD-BAND GSM / GPRS
DATA SHEET
Package and Handling Information
Because of its sensitivity to moisture absorption, this device package is baked and vacuum-packed prior to shipment. Instructions on the shipping container label must be followed regarding exposure to moisture after the container seal is broken, otherwise, problems related to moisture absorption may occur when the part is subjected to high temperature during solder assembly. The SKY77328 is capable of withstanding an MSL3/260 C solder reflow. Care must be taken when attaching this product, whether it is done manually or in a production solder reflow environment. If the part is attached in a reflow oven, the temperature ramp rate should not exceed 5 C per second; maximum temperature should not exceed 260 C. If the part is manually attached, precaution should be taken to insure that the part is not subjected to temperatures exceeding 260 C for more than 10 seconds. For details on attachment techniques, precautions, and handling procedures recommended by Skyworks, please refer to Skyworks Application Note: PCB Design and SMT Assembly/Rework, Document Number 101752. Additional information on standard * Personnel Grounding - Wrist Straps - Conductive Smocks, Gloves and Finger Cots - Antistatic ID Badges * Protective Workstation - Dissipative Table Top - Protective Test Equipment (Properly Grounded) - Grounded Tip Soldering Irons - Solder Conductive Suckers - Static Sensors
SMT reflow profiles can also be found in the JEDEC Standard J-STD-020B. Production quantities of this product are shipped in the standard tape-and-reel format. For packaging details, refer to Skyworks Application Note: Tape and Reel - RF Modules, Document Number 101568.
Electrostatic Discharge Sensitivity
The SKY77328 has been classified as a Human Body Model Class 1C (1000 volts to < 2000 volts) and Machine Model Class M2 (100 volts to < 200 volts) device. ESD testing has been performed in compliance to the latest JEDEC Human Body Model specification, HBM (JESD22-A114-B) and Machine Model specification, (JESD22-A115-A). A report summarizing the ESD testing, including ESD failure level thresholds on each pin-toground and pin-to-pin combination may be obtained upon request. To avoid ESD damage, both latent and visible, it is very important that the product assembly and test areas follow the Class-1 ESD handling precautions listed below. * Facility - Relative Humidity Control and Air Ionizers - Dissipative Floors (less than 109 to GND) * Protective Packaging and Transportation - Bags and Pouches (Faraday Shield) - Protective Tote Boxes (Conductive Static Shielding) - Protective Trays - Grounded Carts - Protective Work Order Holders
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DATA SHEET
SKY77328 iPACTM PAM FOR QUAD-BAND GSM / GPRS
Technical Information
Closed loop control of the amplifier is enabled when ENABLE is driven to logic high. The PA collector current will then be directly proportional to the VAPC input voltage over the range of 200 mV to 2.1 V. To meet the GSM power versus time mask and switching transient requirements the PAM must be provided with a DAC ramp profile on the VAPC input as well as proper timing on digital controls for the PAC circuitry. Note: Please refer to 3GPP TS 51.010-1: Mobile Station (MS) conformance specification. All GSM specifications are now the responsibility of 3GPP. The standards are available at http://www.3GPP.org.
output power ramp within the time mask and to maintain acceptable spectral limits at specified offset frequencies. The VAPC input has an internal reconstruction filter such that external resistors or capacitors are unnecessary on the phone board or the test fixture. Figure 7 represents the dynamic characteristics of the RF output burst power that results from the ramp profile delivered by the DAC to the VAPC input. The transmit power must not exceed the given limits at the time specified relative to the start and end of the data burst. Additional requirements are placed on spectral components generated by switching transients. Ramping at high rates will result in components that violate these spectral limits. A ramp control signal must be applied to the VAPC pin, which results in the desired power ramp response. The log relationship of VAPC to POUT, along with the finite bandwidth and potential slew rate limitations of the feedback loop, results in a complex mapping of the ramp profile to the actual output power. Careful attention is required in generating the input waveform which results in the desired output response. Figure 8 shows an example of the Skyworks PAM test setup for evaluation of RF performance with various ramp profiles. The user's test setup may also include a TX/RX switch and a diplexer in the output signal path. Alternatively, the SKY77328 PAM may be installed in a phone board.
The SKY77328 has been designed to comply with interface requirements and DAC resolution of leading base band devices. The ramp profile typically consists of a pedestal voltage, 10-16 discrete voltage steps on the rising edge of the burst, a constant region, 10-16 steps on the falling edge, and a final voltage. Typically, the user defines the start, stop, and 10-16 percentage values for each rising and falling edge, which are then applied as discrete voltages at the VAPC input. For the SKY77328, generally the same profile, scaled in amplitude, is used for all frequencies and power control levels. The ultimate purpose is to keep the RF
Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com 16
March 17, 2009 * Skyworks Proprietary and Confidential Information. * Products and product information are subject to change without notice. * 103237A
SKY77328 iPACTM PAM FOR QUAD-BAND GSM / GPRS
DATA SHEET
Figure 7. Example of PAM Recommended Timing Diagram
Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com
103237A * Skyworks Proprietary and Confidential Information * Products and product information are subject to change without notice. * March 17, 2009
17
DATA SHEET
SKY77328 iPACTM PAM FOR QUAD-BAND GSM / GPRS
Figure 8. PAM Evaluation Test Setup - BiCMOS.
Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com 18
March 17, 2009 * Skyworks Proprietary and Confidential Information. * Products and product information are subject to change without notice. * 103237A
Ordering Information
Model Number SKY77328 Manufacturing Part Number SKY77328 Product Revision Package 6 x 6 x 1.2 mm Operating Temperature -20 C to +100 C
Revision History
Revision A Date March 17, 2009 Initial Release Description
References
Application Note: Tape and Reel Information - RF Modules, Document Number 101568 Application Note: PCB Design and SMT Assembly/Rework, Document Number 101752 Application Brief: iPACTM GSM Transmitter Timing, Calibration and Baseband Control, Document Number 103138 Application Note: iPACTM Peak Output Power Calibration, Document Number 103180 User Guide: iPACTM Test and Control - Baseband Emulator Interface, Document Number 103125 JEDEC Standard J-STD-020 3GPP TS 51.010-1; Mobile Station (MS) Conformance Specification (http://www.3GPP.org)
(c) 2004, 2005, 2009, Skyworks Solutions, Inc. All Rights Reserved. Information in this document is provided in connection with Skyworks Solutions, Inc. ("Skyworks") products or services. These materials, including the information contained herein, are provided by Skyworks as a service to its customers and may be used for informational purposes only by the customer. Skyworks assumes no responsibility for errors or omissions in these materials or the information contained herein. Skyworks may change its documentation, products, services, specifications or product descriptions at any time, without notice. Skyworks makes no commitment to update the materials or information and shall have no responsibility whatsoever for conflicts, incompatibilities, or other difficulties arising from any future changes. No license, whether express, implied, by estoppel or otherwise, is granted to any intellectual property rights by this document. Skyworks assumes no liability for any materials, products or information provided hereunder, including the sale, distribution, reproduction or use of Skyworks products, information or materials, except as may be provided in Skyworks Terms and Conditions of Sale. THE MATERIALS, PRODUCTS AND INFORMATION ARE PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, WHETHER EXPRESS, IMPLIED, STATUTORY, OR OTHERWISE, INCLUDING FITNESS FOR A PARTICULAR PURPOSE OR USE, MERCHANTABILITY, PERFORMANCE, QUALITY OR NON-INFRINGEMENT OF ANY INTELLECTUAL PROPERTY RIGHT; ALL SUCH WARRANTIES ARE HEREBY EXPRESSLY DISCLAIMED. SKYWORKS DOES NOT WARRANT THE ACCURACY OR COMPLETENESS OF THE INFORMATION, TEXT, GRAPHICS OR OTHER ITEMS CONTAINED WITHIN THESE MATERIALS. SKYWORKS SHALL NOT BE LIABLE FOR ANY DAMAGES, INCLUDING BUT NOT LIMITED TO ANY SPECIAL, INDIRECT, INCIDENTAL, STATUTORY, OR CONSEQUENTIAL DAMAGES, INCLUDING WITHOUT LIMITATION, LOST REVENUES OR LOST PROFITS THAT MAY RESULT FROM THE USE OF THE MATERIALS OR INFORMATION, WHETHER OR NOT THE RECIPIENT OF MATERIALS HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. Skyworks products are not intended for use in medical, lifesaving or life-sustaining applications, or other equipment in which the failure of the Skyworks products could lead to personal injury, death, physical or environmental damage. Skyworks customers using or selling Skyworks products for use in such applications do so at their own risk and agree to fully indemnify Skyworks for any damages resulting from such improper use or sale. Customers are responsible for their products and applications using Skyworks products, which may deviate from published specifications as a result of design defects, errors, or operation of products outside of published parameters or design specifications. Customers should include design and operating safeguards to minimize these and other risks. Skyworks assumes no liability for applications assistance, customer product design, or damage to any equipment resulting from the use of Skyworks products outside of stated published specifications or parameters. Skyworks, the Skyworks symbol, "Breakthrough Simplicity," DCR, Helios, HIP3, Innovation to Go, Intera, iPAC, LIPA, Polar Loop, and System Smart are trademarks or registered trademarks of Skyworks Solutions, Inc., in the United States and other countries. Third-party brands and names are for identification purposes only, and are the property of their respective owners. Additional information, including relevant terms and conditions, posted at www.skyworksinc.com, are incorporated by reference.

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