®
HFA3765
PRELIMINARY
February 1998
AGC and Quadrature IF Demodulator
Features
Description
The HFA3765 is a monolithic quadra-
ture demodulator and a gain control
amplifier stage with 90dB of dynamic
DescriptionIF Operation10MHz to 250MHz
• I/Q Amplitude and Phase Balance . . 0.5dB, 2 Degrees
• Voltage Gain. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .>60dB
• AGC Range. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .90dB
range for CDMA/AMPS cellular applications. Two amplifier
inputs are provided for interfacing different IF input filters. A
local oscillator input requires low drive levels and a divide by
two phase shifter with duty cycle compensation achieves
excellent phase and amplitude balance properties. The
HFA3765 is one of the four chips in the PRISM™ chip set
and is housed in a 28 lead SSOP package ideally suited to
cellular handset applications.
• Output P1dB With 20pF Load . . . . . . . . . . . . . . . 2.5V
PP
• Low LO Drive Level . . . . . . . . . . . . . . . . . . . . . . -10dBm
• Power Enable/Disable Control
Ordering Information
• Single Supply Battery Operation . . . . . . . . . 2.7 to 3.3V
TEMP.
o
Applications
PART NUMBER RANGE ( C)
PACKAGE
28 Ld SSOP
Tape and Reel
PKG. NO.
• IS-95A CDMA/AMPS Dual Mode Handsets
HFA3765IA
-40 to 85
-40 to 85
M28.15
• Wideband CDMA Handsets
HFA3765IA96
• Full Duplex Transceivers
• CDMA/TDMA Packet Protocol Radios
PRISM™ and the PRISM™ logo are trademarks of Intersil Corporation.
Pinout
HFA3765
(SSOP)
TOP VIEW
Simplified Block Diagram
28 V+_AGC
27 IF_OUT+
26 IF_OUT-
BYP+
IF_CDMA+
IF_CDMA-
GND
1
2
3
4
5
6
7
8
9
25
GND
24
IF_FM+
IF_FM-
GND_AGC
23
DEMOD-
22
BYP-
SEL
SW
DEMOD+
AGC_CTRL
SEL
21 V+_AMP
20
QOUT+
19 QOUT-
18 GND
RX_PE 10
GND 11
o
o
÷2 0 /90
BIAS
NETWORK
GND_LO 12
17 IOUT+
13
16
V+_LO
IOUT-
15 GND_AMP
LO_IN 14
AGC_CTRL
LO_IN
RX_PE
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
File Number 4300.3
Copyright © Intersil Americas Inc. 2002. All Rights Reserved
1