|Category||Communication => Wireless => Wireless LAN|
|Description||2.4GHz Power Amplifier And Detector|
|Datasheet||Download ISL3985IR-TK datasheet
The a 2.4GHz monolithic SiGe Power Amplifier designed to operate in the ISM Band. It features two low voltage single supply stages. Cascaded, they deliver 20dBm (Typ) output power for the typical DSSS signal. In addition, the device includes a 2.4GHz detector which is accurate over a 15dB dynamic range within (±)1dB. Therefore, an accurate ALC function can be implemented. The ISL3985 is housed a 16 lead QFN package.Features
Single Supply. to 3.6V Output Power. 20dBm (Typ) at ACPR, DSSS, 1st Side Lobe -30dBc, 2nd Side Lobe < -50dBc Power Gain. 25.5dB (Typ) Detector Linear Input Power Range.15dB Detector Accuracy. ±1dB QFN Package: - Compliant to JEDEC PUB95 MO-220 QFN - Quad Flat No Leads - Package Outline - Near Chip Scale Package footprint, which improves PCB efficiency and has a thinner profilePART NUMBER ISL3985IR ISL3985IR-TK TEMP RANGE (oC) to 85 PACKAGE 16 Ld. QFN PKG. DWG. # L16.5x5B
Systems Targeting IEEE802.11 WLANs @ 2.4GHz Wireless Local Area Networks (WLAN) PCMCIA Wireless Transceivers ISM Systems Including Automatic Level Control (ALC) TDMA Packet Protocol Radios
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright © Intersil Americas Inc. 2003. All Rights Reserved PRISM® is a registered trademark of Intersil Americas Inc. PRISM and design is a trademark of Intersil Americas Inc.
BIAS_VCC Power Supply. REXT Bias Resistor, biasing scheme independent of absolute temperature. Driver Stage Power Supply. DC and RF Ground. RF Output of the Power Amplifier. DC and RF Ground. RF Input of the Power Amplifier. Detector Output. Detector Power Supply. Digital Input Control Pin to enable operation of the Power Amplifier. Enable logic level is high.
The ISL3985 power detect function provides a DC output voltage that is proportional to the logarithm of the output power. For an output power of 23dBm, the detector is accurate to within 0.5dB. The slope of the detector output voltage is 100mV/dB over a 15dB dynamic range. A simple application of the detector is to provide in-line monitoring of the output power using a DC voltmeter. A more value added application would use one of Intersil PRISM Baseband Processors to dynamically monitor the ISL3985 output power and to control transmit power by adjusting the AGC of the previous state to provide the best possible error free data transfer rate for any given environment. Closed loop power control is very important feature which compensates for variability in the transmit chain (radio to radio, channel to channel, over temperature...). The ISL3985 power up/down feature integrates the power down capability onto the IC and requires no external components thus freeing up board space and reducing external component count and cost. When the CMOS compatible Power Enable (PE) pin is driven low, the total supply current drops to under 50µA in, typically, 300ns. When the PE pin is driven high, the full ISL3985 output power is available in a few hundred nanoseconds. In summary, the ISL3985 RFPA provides a highly cost effective solution for the PA function by integrating many features that would require significant development time, drive up the total bill of materials cost and consume precious board space. It mates seamlessly with the other PRISM ICs to provide a highly integrated, cost effective WLAN solution in the to 2.5GHz ISM band.
The ISL3985 works seamlessly with the PRISM II and PRISM 2.5 and 3 WLAN chip set components to complete a highly integrated, cost effective WLAN solution in the to 2.5GHz ISM band. The ISL3985 is fabricated in the fastest SiGe BiCMOS process available allowing superior RF performance, normally found only in GaAs ICs. Cost effective functions, normally requiring external components, are integrated into one IC. The ISL3985 integrates the following functions in one compact 16 pin QFN: Two Stage, 25.5dB Gain RFPA, Logarithmic power detect function (15dB Dynamic Range), CMOS level compatible Power Up/Down function, Single Supply, to 3.6V Operation. The ISL3985 contains a highly linear RFPA designed to deliver 20dBm and meet an ACPR specification -30dBc in the to 2.5GHz ISM band. The efficiency of this two stage RFPA can be optimized by adjusting the bias current with a dedicated resistor when lower power output is used. No external positive or negative power supplies are required to set the bias currents. The on chip bias network provides the optimum bias current temperature compensation when low TC external resistor is used. To get the best performance from the ISL3985, the output stage matching network can be tailored using external components.
Supply Voltage. 4.0V Voltage on Any Other Pin. -0.3 to VCC +0.3V VCC to VCC Decouple. to +0.3V Any GND to GND. to +0.3V
Thermal Resistance (Typical, Note 1) JA (oC/W) JC (oC/W) QFN Package. 33 3 Maximum Junction Temperature (Plastic Package).150oC Maximum Storage Temperature Range. to 150oC For Recommended soldering conditions see Tech Brief TB389.
CAUTION: Stresses above those listed in "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
NOTE: JA is measured in free air with the component mounted on a high effective thermal conductivity test board with "direct attach" features. JC, the "case temp" is measured at the center of the exposed metal pad on the package underside. See Tech Brief TB379.
PARAMETER Supply Voltage Total Power Amplifier Supply Current 3.3V, 21dBm Output RF Detector Supply Current Power Down Supply Current Power Up/ Down Speed CMOS Low Level Input Voltage CMOS High Level Input Voltage (VDD = 3.6V) CMOS Threshold Voltage CMOS High or Low Level Input Current MIN >0.3*VDD -10 TYP 0.5*VDD MAX <0.7*VDD +10 UNITS V µA
Power Amplifier AC Electrical Specifications VCC = 2.45GHz, Unless Otherwise Specified. Typical Application Circuit
(external input and output matching networks) have been used. = 25oC TEST CONDITIONS MIN 2400 25.0 ACPR, DSSS, 1st Side Lobe <-30dBc, 2nd Side Lobe <-50dBc Output Spurs Less than -60dBc (Note 2) 19.5 TYP MAX PARAMETER RF Frequency Range Power/Voltage Gain Output PM @ compression Input 50 VSWR Output 50 VSWR Output Power Output Stability VSWR Output Load Mismatch NOTE: 2. Devices sustain no damage when subjected to a mismatch of maximum 10:1. UNITS MHz dB dBm Degrees dBm -
PARAMETER RF Output Detector Response Time RF Output Detector Voltage Range RF Output Detector Linearity TEST CONDITIONS External Capacitor, = 5pF Load > 1M Over Linear Range TEMP. (oC) Full MIN 0 -0.5 TYP 0.15 MAX 1.5 +0.5 UNITS µs V dB/V
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