MSK Modem. NJU7512VT Datasheet

NJU7512VT Modem. Datasheet pdf. Equivalent

NJU7512VT Datasheet
Recommendation NJU7512VT Datasheet
Part NJU7512VT
Description 1200 bps MSK Modem
Feature NJU7512VT; NJU7512VT 1200 bps MSK Modem for Data Communication GENERAL DESCRIPTION The NJU7512 is a 1200bps M.
Manufacture New Japan Radio
Datasheet
Download NJU7512VT Datasheet




New Japan Radio NJU7512VT
NJU7512VT
1200 bps MSK Modem for Data Communication
GENERAL DESCRIPTION
The NJU7512 is a 1200bps MSK (Minimum Shift Keying)
modem IC, which operates from 1.8V power supply.
It includes 14.7456MHz oscillator and selectable OSC buffer
for an external output, and a frame detector for receiving.
MSK modem is especially used for low power data
communication, which requires high receiving sensitivity
and noise susceptibility characteristics.
PACKAGE OUTLINE
NJU7512VT
FEATURES
Low Operating Current
1.9mA (Modulation and Demodulation operation, VDD=1.8V)
Wide Operating Voltage range
1.8 to 5.5V
Baud Rate
1200 bps
Oscillating Frequency
14.7456 MHz
Selectable OSC Buffer Output
14.7456 MHz or 3.6864 MHz
Built-in Frame Detector
2 types of frame data or disable
Power Save Function
Power control for Modulator and Demodulator blocks respectively
Easy to use modem function
A few external parts required
Wide Operating Temperature range - 40 to +105 °C
CMOS Technology
Package Outline
SSOP20 6.5mm x 6.4mm, t=0.65mm
Please refer the IC Package information about the Package outline and Packing.
BLOCK DIAGRAM
AIN AGS
12
-- BPF
+
FRS 17
FRK 18
Detector
Limiter Amp.
Clock
Recocer
Frame
Detector
TD 15
TRD 16
MSK
Mod.
Sine
Wave
LPF
Standard Bias Analog
Voltage Voltage Ground
Internal Timing Clock
Timing
Generator
Standard Bias
19
10 20
11 7
MX
VSS VDD1
FSE XBO
5 RDT
4 RTM
3 PLLS
14 PDRX
13 PDTX
12 BR
8 XOUT
9 XIN
6 VDD2
Ver.2013-07-10
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New Japan Radio NJU7512VT
PIN CONFIGURATION
NJU7512VT
AIN
AGS
PLLS
RTM
RDT
VDD2
XBO
XOUT
XIN
VSS
1
2
3
4
5
6
7
8
9
10
20 V D D 1
19 M X
18 F R K
17 F R S
16 T R D
15 T D
14 P D R X
13 P D T X
12 B R
11 F S E
NJU7512VT
Ver.2013-07-10
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New Japan Radio NJU7512VT
NJU7512VT
TERMINAL DESCRIPTION
Pin
No.
SYMBOL
1 AIN
2 AGS
3 PLLS
4 RTM
5 RDT
6 VDD2
7 XBO
8 XOUT
9 XIN
10 VSS
11 FSE
12 BR
13 PDTX
14 PDRX
15 TD
16 TRD
17 FRS
18 FRK
19 MX
20 VDD1
Function
Input terminal of the Input buffer amplifier
Output terminal of the input buffer amplifier
PLL control input terminal
Selection of the phase correction speed
of PLL of the detector, either low-speed
or high-speed correction.
PLLS
High
Low
Phase correction speed
Low-speed phase correction
High-speed phase correction
MSK demodulation synchronous clock output terminal
MSK demodulation data output terminal
It synchronizes with falling of the MSK demodulation synchronous clock.
Oscillator circuit power supply terminal
Output of oscillator circuit buffer
This is the output terminal of the oscillator circuit buffer to supply to external circuits.
Oscillator circuit output terminal
A crystal oscillator is connected between this pin and XIN terminals.
When using an external clock, This terminal doesn't need to connect (no connection).
Oscillator circuit input terminal
A crystal oscillator is connected between this pin and XOUT terminals.
When using an external clock, it becomes an input terminal for it.
Grand terminal
Selection of the buffer output frequency
Select either oscillating frequency or 1/4
frequency for buffer output frequency.
* A frequency of the crystal oscillator is
14.7456 MHz.
FSE
High
Low
Output Frequency (MHz)
3.6864
14.7456
Transmission-speed control terminal
Always Logical High
BR
speed Career frequency (Hz)
(bps)
Data 1 Data 0
High 1200
1200 1800
In Power Down
PDTX = Low PDRX = Low
--
- Low
--
- High
-
-
High
High
--
--
--
--
Control terminal of the modulation
block for power down function.
PDTX
High
Low
Operation
Modulation block power-on
Modulation block power-off
-
-
Control terminal of the demodulation PDRX
block for power down function.
High
Low
Operation
Demodulation block
power-on
Demodulation block
power-off
--
MSK modulation data input terminal
The modulation data is red at the rise timing of TRD signal.
--
MSK modulation data read-timing output terminal
The data of TD terminal is red in synchronizing with a rise edge.
Low -
Selection of the frame data
16 bits, 2 types of the frame data
When the selected frame data is
received, RTM and RDT are output.
FRS
High
Low
Frame Data
1100010011010110 B (C4D6 H)
1001001100110110 B (9336 H)
-
-
Select enable or disenable of the flame
detection
FRK
High
Low
Digital output of MSK modulation signal
Supply voltage
Operation
Enable
Disenable
--
Low -
--
Ver.2013-07-10
-3-







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