intersil ISL3984 DATA SHEET

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ISL3984

[ /Title
(ISL39

84)
/Sub­ject
(2.4G
Hz
Power
Ampli­fier
and
Detec­tor)
/Autho
r ()
/Key­words
(Inter­sil
Corpo­ration,
semi­con­ductor,
Wire­less
Com­muni­cations
, RF,
Radio
Fre­quency
, IF,
Inter­medi­ate
Fre-

PRELIMINARY

Data Sheet December 2000

2.4GHz Power Amplifier and Detector

The ISL3984 is 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 18dBm (Typ) output power for the
typical DSSS signal (ACPR, 1st Side Lobe < -30dBc, 2nd
Side Lobe < -50dBc).

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 ISL3984 is housed in a 16 lead MLFP package well
suited for PCMCIA board applications.

Ordering Information

TEMP

PART NUMBER

ISL3984IR -40 to 85 16 Ld MLFP L16.4x4
ISL3984IR96 -40 to 85 Tape and Reel

RANGE (oC) PACKAGE PKG. NO.

Simplified Block Diagram

DS_VCC

RF_IN

BIAS

PE REXT

PEAK DETECTOR

LOG

DET_OUT

RF_OUT

File Number 4862.4

Features

• Single Supply . . . . . . . . . . . . . . . . . . . . . . . . .2.7V to 3.6V

• Output Power . . . . . . . . . . .18dBm (Typ) at ACPR, DSSS,

1st Side Lobe < -30dBc, 2nd Side Lobe < -50dBc

• Power Gain. . . . . . . . . . . . . . . . . . . . . . . . . . . . 30dB (Typ)

• Detector Linear Input Power Range . . . . . . . . . . . . . .15dB

• Detector Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .±1dB

Applications

• IEEE802.11 1, 2 or 5.5Mbps Standard

• Systems Targeting IEEE802.11b, 11Mbps Standard

• Wireless Local Area Networks (WLAN)

• PCMCIA Wireless Transceivers

• ISM Systems Including Automatic Level Control (ALC)

• TDMA Packet Protocol Radios

Pinouts

ISL3984 (MLFP)

TOP VIEW

GND

RF_IN

2

REXT

10

3

DS_VCC

9

4

GND

GND

8
7
6
5

GND
GND

RF_OUT

GND

DET_OUT
VCC_DET

PE

BIAS_GND

GND

12

11

13

PACKAGE PINOUT

14

SUBJECT TO CHANGE

15
16

1

BIAS_VCC

1

1-888-INTERSIL or 321-724-7143 | Intersil and Design is a trademark of Intersil Corporation. | Copyright © Intersil Corporation 2000

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

PRISM® is a registered trademark of Intersil Corporation. PRISM and design is a trademark of Intersil Corporation.

ISL3984

Pin Descriptions

PIN NUMBER NAME DESCRIPTION

1 BIAS_VCC Power Supply.

2 REXT Bias Resistor, biasing scheme

independent of absolute
temperature.

3 DS_VCC Driver Stage Power Supply.

4, 5 GND DC and RF Ground.

6 RF_OUT RF Outputof thePower Amplifier.

7, 8, 9, 10 GND DC and RF Ground.

11 RF_IN RF Input of the Power Amplifier.

12 GND DC and RF Ground.

13 DET_OUT Detector Output.

14 VCC_DET Detector Power Supply.

15 PE DigitalInput ControlPin toenable

operation of thePower Amplifier.
Enable logic level is high.

16 BIAS_GND DC and RF Ground.

The ISL3984 contains a highly linear RFPA designed to deliver
18dBm and meet an ACPRspecificationof-30dBc in the 2.4 to

2.5GHz ISM band. The performance of this two stage RFPA

can be optimized by adjusting the bias current with a dedicated
resistor. No e xternal positive or negativ e po wer 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 ISL3984, the output stage matching
network can be tailored using external components.

The ISL3984 power detect function provides a DC output
voltage that is proportional to the logarithm of the output
power. For an output power of 18dBm, the detector is
accurate to within a 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. No longer is a power
meter or spectrum analyzer required. A more value added
application would use the HFA3861B/HFA3863 Baseband
Processor to dynamically monitor the ISL3984 output power
and to control transmit power by adjusting the AGC of the
HFA3783 IF Quadrature Modem 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 ISL3984 works seamlessly with the PRISM II and
PRISM II.V WLAN chip set components to give you a highly
integrated, cost effectiv e 11Mb/s WLAN solution in the 2.4 to

2.5GHz ISM band. The ISL3984 is fabricated in the fastest
SiGe BiCMOS process available allo wing superior RF
performance, normally found only in GaAs ICs. Cost effective
functions, normally requiring external components, are
integrated into one IC. The ISL3984 integrates the following
functions in one compact 16 pin MLFP:

• Two Stage, 30dB Gain RFPA,

• Logarithmic power detect function (15dB Dynamic
Range),

• CMOS level compatible Power Up/Down function,

• Single Supply, 2.7V to 3.6V Operation.

The ISL3984 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 ISL3984 output
power is available in a few hundred nanoseconds.

In summary, the ISL3984 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 II
ICs to provide a highly integrated, cost effective 11Mb/s
WLAN solution in the 2.4 to 2.5GHz ISM band.

2

ISL3984

Absolute Maximum Ratings Thermal Information

Supply Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4V

Voltage on Any Other Pin. . . . . . . . . . . . . . . . . . . -0.3 to VCC+0.3V

VCC to VCC Decouple . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to +0.3V

Any GND to GND. . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to +0.3V

Operating Conditions

Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40 to 85oC

Supply Voltage Range. . . . . . . . . . . . . . . . . . . . . . . . . . 2.7V to 3.6V

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:

1. θJAis measured in free air with the component mounted on a high effectivethermalconductivity test board with “direct attach” features. See
Intersil TB379.

General DC Electrical Specifications

PARAMETER TEMP. (oC) MIN TYP MAX UNITS

Supply Voltage Full 2.7 - 3.6 V
Total Power Amplifier Supply Current at 3.3V, 18dBm Output 25 - 137 - mA
RF Detector Supply Current 25 - - 2 mA
Power Down Supply Current Full - 200 - µA
Power Up/ Down Speed Full - 300 - ns
CMOS Low Level Input Voltage Full - - 0.3*V
CMOS High Level Input Voltage (VDD = 3.6V) Full 0.7*V
CMOS Threshold Voltage Full >0.3*V
CMOS High or Low Level Input Current Full -10 - +10 µA

Thermal Resistance (Typical, Note 1) θJA (oC/W)

MLFP Package. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Maximum Junction Temperature (Plastic Package) . . . . . . . .150oC

Maximum Storage Temperature Range. . . . . . . . . . -65oC to 150oC

Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . .300oC

V

V

DD

DD

DD

--V

0.5*V

DD

<0.7*V

DD

Power Amplifier AC Electrical Specifications V

PARAMETER TEST CONDITIONS TEMP. (oC) MIN TYP MAX UNITS

RF Frequency Range Full 2400 - 2500 MHz
Power/Voltage Gain Full 27 30 35 dB
Input 50Ω VSWR 25 - - 2:1 ­Output 50Ω VSWR 25 - - 3:1 ­Output Power ACPR, DSSS, 1st Side Lobe <-

30dBc, 2nd Side Lobe <-50dBc
Output Stability VSWR Output Spurs Less than -60dBc Full - - 10:1 ­Output Load Mismatch (Note 2) Full - - 10:1 -

NOTE:

2. Devices sustain no damage when subjected to a mismatch of maximum 10:1.

= 3.3V, f = 2.45GHz, Unless Otherwise Specified. Typical Application Circuit

CC

(external input and output matching networks) has been used.

Full - 18 - dBm

Peak Detector AC Electrical Specifications

TEMP.

PARAMETER TEST CONDITIONS

RF Output Detector Response Time External Capacitor, C = 5pF Full - 0.15 - µs
RF Output Detector Voltage Range Load > 1M Full 0 - 1.5 V
RF Output Detector Linearity Over Linear Range Full -0.5 - 0.5 dB/V
RF Output Detector Accuracy 600mVDC Output Full -1 - +1 dB

(oC) MIN TYP MAX UNITS

RF Output Detector Slope Over Linear Range Full - 10 - dB/V

3