1
PRELIMINARY
February 1998
HFA3765
AGC and Quadrature IF Demodulator
Features
DescriptionIF Operation10MHz to 250MHz
I/Q Amplitude and Phase Balance . . 0.5dB, 2 Degrees
Voltage Gain. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .>60dB
AGC Range. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .90dB
Output P1dB With 20pF Load . . . . . . . . . . . . . . . 2.5V
PP
Low LO Drive Level . . . . . . . . . . . . . . . . . . . . . . -10dBm
Power Enable/Disable Control
Single Supply Battery Operation . . . . . . . . . 2.7 to 3.3V
Applications
IS-95A CDMA/AMPS Dual Mode Handsets
Wideband CDMA Handsets
Full Duplex Transceivers
CDMA/TDMA Packet Protocol Radios
Description
The HFA3765 is a monolithic quadra-
ture demodulator and a gain control
amplifier stage with 90dB of dynamic
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.
Ordering Information
Pinout
HFA3765
(SSOP)
TOP VIEW
PRISM and the PRISM logo are trademarks of Intersil Corporation.
Simplified Block Diagram
PART NUMBER
TEMP.
RANGE (
o
C)
PACKAGE
PKG. NO.
HFA3765IA
-40 to 85
28 Ld SSOP
M28.15
HFA3765IA96
-40 to 85
Tape and Reel
BYP+
BYP-
IF_CDMA+
IF_CDMA-
GND
IF_FM+
IF_FM-
AGC_CTRL
SEL
RX_PE
GND
GND_LO
LO_IN
V+_AGC
IF_OUT-
GND_AGC
GND
DEMOD+
V+_AMP
QOUT-
GND
IOUT+
GND_AMP
IF_OUT+
DEMOD-
QOUT+
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
V+_LO
IOUT-
LO_IN
÷
2
0
o
/90
o
I
Q
C
F
AGC_CTRL
C
/
I
BIAS
NETWORK
RX_PE
SEL
SW
I
I
D
D
File Number
4300.3
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.
Copyright Intersil Americas Inc. 2002. All Rights Reserved