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Atmel Electronic Components Datasheet

U3770M Datasheet

CT2 I/Q Modulator and Clock Circuitry

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CT2 I/Q Modulator and Clock Circuitry
U3770M
Description
The U3770M is a quadrature modulator realized using
Atmel Wireless & Microcontrollers’ advanced 0.8 mi-
cron CMOS process. The IC is especially designed for
CT2 applications in conjunction with Atmel Wireless &
Microcontrollers’ RF/IF signal processor U2760B and a
CT2 baseband controller (i.e., AMD PhoXTM controller
Am79C4xx). Together with Atmel Wireless &
Microcontrollers’ 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
RRef in 12.8 MHz
2
DIV / 25
Phase
512 kHz comparator
LF
11
VCO
95 9881
14 CLK out
VDD
DGND
AGND
PROG
TST
Qin
QBin
Iin
IBin
3
4
13
12
10
6
5
8
7
1, 15, 16
DNC
Amp.
Ordering Information
Extended Type Number
U3770M-MFP
U3770M-MFPG3
512 kHz DIV / 36 18.432 MHz
DIV / 2
or
DIV / 4
6.4 MHz
Dual DFF
3.2 MHz
9 MOD out
Figure 1. Block diagram
Package
SO16
SO16
Remarks
Tube
Taped and reeled
Rev. A3, 07-Sep-00
1 (6)


Atmel Electronic Components Datasheet

U3770M Datasheet

CT2 I/Q Modulator and Clock Circuitry

No Preview Available !

U3770M pdf
U3770M
Functional Description
The U3770M has been designed to reduce power con-
sumption and cost of CT2 devices. An innovative CMOS
I/Q modulator with extremely low current provides all the
advantages of I/Q modulation:
No requirement for FM deviation tuning
Eliminates the Gaussian filter
Simplifies the power ramping control
The modulated output carrier can be programmed to be
0.8 MHz or 1.6 MHz by the PROG control pin.
The typical supply voltage is 3 V @ 4 mA.
To reduce overall system cost, an internal PLL generates
an 18.432-MHz clock signal from the systems 12.8-MHz
reference oscillator. This way, only one crystal oscillator
is needed in the complete CT2 device.
Internally, the 12.8-MHz reference signal is fed into a
shaping amplifier and then into two logic dividers, to gen-
erate a 512-kHz and a programmable 3.2-MHz or
6.4-MHz clock. This clock is divided by 4 by two D flip-
flops. The flip-flop outputs drive the four analog switches
in quadrature. The local oscillator (LO) supression mixer
consists of a pair of analog switches. make a local oscilla-
tor (LO) suppression mixer. By summing the other pair
outputs the suppression (both LO and side tone) is
<26 dBc.
The 512-kHz clock drives a frequency synthesizer. The
VCO runs at a fixed frequency of 18.432 MHz. The VCO
control voltage (LF pin) controls the VCO frequency.
Pin Description
n.c. 1
16 n.c.
FRef in 2
15 n.c.
VDD 3
14 CLKout
DGND 4
13 AGND
QB 5
12 PROG
Q6
11 LF
IB 7
10 TST
I8
9 MODout
95 9930
Figure 2. Pinning
Pin
2
3
4
5
6
7
8
9
10
11
12
13
14
1, 15,
16
Symbol
FRef in
VDD
DGND
QBin
Qin
IBin
Iin
MODout
TST
LF
PROG
AGND
CLKout
n.c.
Function
External 12.8-MHz reference
frequency input
Supply voltage
Digital ground
Analog switch input
Analog switch input
Analog switch input
Analog switch input
Modulator output signal
Test input, must be connected to
GND (only factory use)
PLL loop filter
PROG = 0, 1.6-MHz mode
PROG = 1, 0.8-MHz mode
Analog ground
Digital CMOS clock output
18.432 MHz
Not connected
2 (6) Rev. A3, 07-Sep-00


Part Number U3770M
Description CT2 I/Q Modulator and Clock Circuitry
Maker ATMEL Corporation
Total Page 6 Pages
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