TM
HFA3665
PRELIMINARY
May 1999
CDMA/AMPS Downconverter with AGC Capability
Features
Description
• RF Frequency Range. . . . . . . . . . . . 869MHz to 895MHz
• IF Operation . . . . . . . . . . . . . . . . . . . . 10MHz to 100MHz
• LNA Gain. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16dB
• LNA NF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.3dB
• Mixer Gain. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16dB
• Mixer NF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11dB
• Single Supply Battery Operation . . . . . . . . 2.7V to 3.3V
• Power Enable/Disable Control
The HFA3665 is a monolithic bipo-
lar downconverter for CDMA/AMPS
cellular applications. Manufactured
in the Intersil UHF1X process, the
device consists of a low noise cascode amplifier, a double
balanced downconversion mixer and a pair of linearized and
temperature compensated PIN diode biasing current
sources for external RF AGC applications. In addition, the
device offers two independent and selectable differential
mixer IF output ports to be used with dual mode IF filters and
requires low drive levels from the local oscillator. The
HFA3665 is one of the four chips in the PRISM™ chip set
and is housed in a small outline 28 lead SSOP package ide-
ally suited for cellular handset applications.
• PIN Diode Attenuator DC Control
Applications
Ordering Information
• IS95A CDMA/AMPS Dual Mode Handsets
• Wideband CDMA Handsets
TEMP.
PKG.
NO.
o
PART NUMBER
HFA3665IA
RANGE ( C)
PACKAGE
28 Ld SSOP
• CDMA/TDMA Packet Protocol Radios
• Full Duplex Transceivers
-40 to 85
M28.15
HFA3665IA96
-40 to 85
Tape and Reel
• Portable Battery Powered Equipment
Pinout
Block Diagram
HFA3665
(SSOP)
TOP VIEW
LNA_OUT
RF_IN
CDMA_OUT-
LNA_IN
LNA
V
1
2
3
4
5
6
7
8
9
28 MIX_V
27 SEL
26 MIX_V
25
CC
CC
AGC_CTRL
PIN_O_IBIAS1
GND
CDMA_OUT+
SEL
CC
PIN_O_IBIAS1
PIN_O_IBIAS2
SW
C
T
R
L
MIX_IND
RF_IN
FM_OUT-
24
23
22
LNA_OUT
LNA_OUT
GND
RF_RET
MIX_GND
BIAS
FM_OUT+
RX_PE
GND
21 LO_RET
20
LO_IN
AGC_CTRL
LNA_IN
LO_IN
PIN_O_IBIAS2 10
PIN_I_GND 11
RX_PE 12
19 CDMA_OUT-
18 CDMA_OUT+
17 FM_OUT-
16
R_REF 13
FM_OUT+
BIAS_GND 14
15 BIAS_V
CC
PRISM™ and the PRISM™ logo are trademarks of Intersil Corporation.
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.
File Number 4301.5
Copyright © Intersil Corporation 1999
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