U3770M
CT2 I/Q Modulator and Clock Circuitry
Description
The U3770M is a quadrature modulator realized using
Atmel Wireless & Microcontrollers鈥?advanced 0.8 mi-
cron CMOS process. The IC is especially designed for
CT2 applications in conjunction with Atmel Wireless &
Microcontrollers鈥?RF/IF signal processor U2760B and a
CT2 baseband controller (i.e., AMD PhoX
TM
controller
Am79C4xx). Together with Atmel Wireless &
Microcontrollers鈥?PLL IC U2783B and the GaAs front
end U7001BG, a complete CT2 chip set is available.
Electrostatic sensitive device.
Observe precautions for handling.
Features
D
Programmable 0.8/1.6-MHz quadrature-modulated
carrier generation
D
More than 26 dB LO and sideband suppression
D
18.432 MHz CMOS level clock generation
D
Supply-voltage range 2.7 V to 3.3 V
D
Low power consumption, typically 12 mW
D
SO16 package or die form
Block Diagram
R
Ref in
12.8 MHz
2
DIV / 25
Phase
512 kHz comparator
LF
11
VCO
14
CLK out
95 9881
Amp.
3
4
13
12
10
6
5
8
7
1, 15, 16
DNC
DIV / 2
or
DIV / 4
6.4 MHz
3.2 MHz
512 kHz
DIV / 36
18.432 MHz
VDD
DGND
AGND
PROG
TST
Q
in
QB
in
I
in
IB
in
Dual DFF
9
MOD out
Figure 1. Block diagram
Ordering Information
Extended Type Number
U3770M-MFP
U3770M-MFPG3
Package
SO16
SO16
Tube
Taped and reeled
Remarks
Rev. A3, 07-Sep-00
1 (6)