SKY77328 Datasheet, PDF (1/19 Pages) Skyworks Solutions Inc. – iPAC PAM for Quad-Band GSM/GPRS

DATA SHEET
SKY77328 iPAC™ 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
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 Ω 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
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, impedance-
matching circuitry for 50 Ω 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 Ω load to reduce the
number of external components for a quad-band design. Extremely low leakage current (2.5 μA,
typical) of the dual PA module maximizes handset standby time. The SKY77328 also contains band-
select 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 (iPAC™) 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.
Figure 1. Functional Block Diagram
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com
103237A • Skyworks Proprietary and Confidential Information • Products and product information are subject to change without notice. • March 17, 2009
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