U3770M [TEMIC]
CT2 I/Q Modulator and Clock Circuitry; CT2的I / Q调制器和时钟电路
| 型号： | U3770M |
| 厂家： | 
TEMIC SEMICONDUCTORS |
| 描述： | CT2 I/Q Modulator and Clock Circuitry |
| 文件： | 总5页 (文件大小：61K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
U3770M
CT2 I/Q Modulator and Clock Circuitry
Description
U3770M is a quadrature modulator realized with with TEMIC’s PLL IC U2783B and the GaAs front end
MATRA MHS’ advanced 0.8 micron CMOS process. U7001BG, a complete CT2 chip set is available.
The IC is especially designed for CT2 application
in conjunction with TEMIC’s RF/IF signal processor
Electrostatic sensitive device.
Observe precautions for handling.
U2760B
and
a
CT2
baseband
controller
TM
(i.e., AMD PhoX controller Am79C4xx). Together
Features
Programmable 0.8/1.6 MHz quadrature modulated
carrier generation
Supply voltage range 2.7 to 3.3 V
Low power consumption, typical 12 mW
SO16 package or die form
More than 26 dB LO and sideband suppression
18.432 MHz CMOS level clock generation
Block Diagram
R
Ref in
12.8 MHz
LF
95 9881
11
2
14
CLK out
Phase
comparator
VCO
DIV / 25
512 kHz
Amp.
DIV / 36
512 kHz
18.432 MHz
3
VDD
DGND
AGND
PROG
TST
4
DIV / 2
or
DIV / 4
6.4 MHz
3.2 MHz
13
12
10
Dual DFF
9
MOD out
6
5
Q
in
in
in
QB
8
7
I
IB
in
1, 15, 16
DNC
Figure 1. Block diagram
MATRA MHS
1 (5)
Rev. A2, 03-Dec-97
U3770M
Functional Description
U3770M has been designed to reduce power consumption reference oscillator. This way, only one crystal oscillator
and cost of CT2 devices. An innovative CMOS I,Q modu- is needed in the complete CT2 device.
lator with an extremely low current provides all the
Internally, the 12.8 MHz reference signal is fed into a
advantages of I,Q modulation:
shaping amplifier and then into two logic dividers, to gen-
–
–
–
No requirement for FM deviation tuning
Eliminates the Gaussian filter
erate a 512 kHz and a programmable 3.2 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 quadra-
ture. A pair of analog switches make a local oscillator
(LO) suppression mixer. By summing the other pair out-
puts, we obtain both LO and sideband suppression, of
more than –26 dBc.
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.
The 512 kHz clock drives a frequency synthesizer. The
To reduce overall system cost, an internal PLL generates VCO runs at a fixed frequency of 18.432 MHz. The VCO
a 18.432 MHz clock signal from the system 12.8 MHz control voltage (LF pin) controls the VCO frequency.
Pin Description
Pin
2
Symbol
Function
External 12.8 MHz reference
frequency input
DNC
DNC
DNC
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
F
Ref in
3
4
5
6
7
8
9
10
VDD
Supply voltage
F
Ref in
DGND Digital ground
QB
Analog switches input
Analog switches input
Analog switches input
Analog switches input
Modulator output signal
Test input, must be connected to
GND (only factory use)
PLL loop filter
in
VDD
CLK
out
Q
in
IB
in
DGND
AGND
I
in
MOD
out
TST
QB
Q
PROG
LF
11
12
LF
PROG
PROG = 0, 1.6 MHz mode
PROG = 1, 0.8 MHz mode
IB
I
TST
13
14
AGND Analog ground
CLK
Digital CMOS clock output
18.432 MHz
out
MOD
out
1, 15,
16
DNC
Do not connect
95 9930
Figure 2. Pinning
2 (5)
MATRA MHS
Rev. A2, 03-Dec-97
U3770M
Absolute Maximum Ratings
Stresses at or above those listed may cause permanent damage to the device. This is a stress rating only and functional operation of the
device at these or any other conditions above those indicated in this data sheet is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect device reliability.
Parameters
Symbol
V
DD
Value
6
Unit
V
Supply voltage
Modulator input voltages
I
IB
Q
QB
–0.5 to V
V
DD
DD
Reference frequency input
Ambient temperature
Storage temperature
F
T
T
–0.5 to V
V
Ref in
–40 to +85
–65 to +150
°C
°C
°C
amb
stg
Junction temperature
T
T < T
+10
j
j
amb
Operating Range
Parameters
Symbol
Value
10%
–5 to +70
T < T +5
Unit
V
°C
°C
°C
Supply voltage
V
DD
3
Ambient temperature
Junction temperature
Storage temperature
T
amb
T
j
j
amb
T
stg
–40 to +125
Electrical Characteristics
Test conditions (unless otherwise specified) related to test circuit
V = 3 V, V
V
and V , V
= 1 V single ended, oscillator frequency F
= 12.8 MHz, T = –5 to +70°C
amb
S
BIi, BIi
BQi BQi
PP
Ref in
Parameters
Test Conditions / Pins
Symbol
Min.
2.7
Typ.
Max.
3.3
Unit
V
mA
Supply voltage range
Supply current
Pin 3
Pin 3
Pin 2
V
3
4
DD
DD
I
F
Ref in
Input voltage
Input impedance
I, Q inputs
V
150
100
mV
k
F Ref in
Z
F Ref in
PP
Pins 5, 6, 7 and 8
Input voltage
Single ended
Single ended
V
Z
F
1
V
k
kHz
V
Iin, Qin
Iin, Qin
Iin, Qin
PP
Input impedance
Input frequency
External bias voltage
20
18
1.5
V
IB, QB
MOD
Output level
Pin 9
out
1)
Unloaded
V
70
–26
mVRMS
dBc
Mod out
LO and sideband suppres-
sion
LO sub
SB sub
Output impedance
Z
5
k
Mod out
CLK
Pin 14
out
Output frequency
Output voltage swing
F
V
18.432
MHz
V
CLK out
@ load = 20 pF
1.8
CLK out
1)
Note
The output signal contains some harmonics, to be filtered by an external low-pass filter
MATRA MHS
3 (5)
Rev. A2, 03-Dec-97
U3770M
Test Circuit
47 nF
4.7 nF
LF
22
11
RRef in
12.8 MHz
2
95 9967
14
Phase
comparator
DIV / 25
VCO
512 kHz
CLK out
3
Amp
DIV / 36
512 kHz
18.432 MHz
VDD
4
DGND
13
DIV / 2
or
DIV / 4
6.4 MHz
3.2 MHz
AGND
12
Dual DFF
PROG
10
TST
9
MOD out
6
5
8
7
IB in
QB in
1 k
Q in
I in
1 nF
1 nF
1 nF
1 nF
1 k
1 k
1 k
Figure 3. Test circuit
4 (5)
MATRA MHS
Rev. A2, 03-Dec-97
U3770M
Package Information
Package: SO16
We reserve the right to make changes to improve technical design and may do so without further notice.
Parameters can vary in different applications. All operating parameters must be validated for each customer
application by the customer. Should the buyer use TEMIC products for any unintended or unauthorized
application, the buyer shall indemnify TEMIC against all claims, costs, damages, and expenses, arising out of,
directly or indirectly, any claim of personal damage, injury or death associated with such unintended or
unauthorized use.
TEMIC TELEFUNKEN microelectronic GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany
Telephone: 49 (0)7131 67 2831, Fax number: 49 (0)7131 67 2423
MATRA MHS
5 (5)
Rev. A2, 03-Dec-97
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