AKM AK2360A

ASAHI KASEI
[AK2360A]
AK2360A
Scrambler IC for two-way radio
Features
† Frequency inversion type scrambler for a voice encryption two-way radio
† High quality decoded voice: S/N=47dB(Typ), S/(N+D)=50dB(Typ)
† Allowing selection of an inverted frequency (3.397kHz or 3.039kHz) and voice passage
band
† Scrambler bypass function included
† Based on 5.3125MHz (1/4 for 21.25MHz) external clock supply
† Operating voltage:
2.6V to 3.3V
† Operating temperature:
-30°C to +85°C
† Package: 8-pin SON
CNT
Block Diagram
AIN
AOUT
AAF
LPF1
BUF
DIV
DBM
SMF
LPF2
AGND
MS0393-E-00
VSS
VDD
SLCT
CLK
+
AGND
Power down
at “CNT=L”
+
2005/05
-1-
ASAHI KASEI
[AK2360A]
Contents
Features ................................................................................... 1
Block Diagram ........................................................................... 1
Contents ................................................................................... 2
General Description ................................................................... 3
Circuit Configuration .................................................................. 3
Pin Functions ............................................................................ 4
Absolute Maximum Ratings ......................................................... 5
Recommended Operating Conditions ........................................... 5
Digital DC Characteristics ........................................................... 5
Clock Input Characteristics ......................................................... 5
Current Consumption ................................................................. 6
Analog Characteristics ............................................................... 6
Recommended External Application Circuits ................................. 7
Package .................................................................................... 9
Important Notice ...................................................................... 10
MS0393-E-00
2005/05
-2-
ASAHI KASEI
[AK2360A]
General Description
The AK2360A is a radio scrambler IC device suitable for half-duplex communication. As the
scrambler method, a simple frequency inversion method is used in which audio signal components
are inverted about the carrier frequency by using the double balanced mixer (DBM).
The inverted frequency and voice passage band can be changed according to the input to the SLCT
pin. The scrambler can be bypassed by using the CNT pin, and part of the circuit blocks is placed in
the power-down state accordingly.
A signal-to-noise ratio of 40dB or more and a distortion of 43dB or more can be obtained by inserting
filters before and after DBM as shown in the block diagram, therefore allowing less sound quality
deterioration when the scrambler is used.
† Pin assignments (Top view)
AGND
1
8
AOUT
AIN
2
7
CNT
VSS
3
6
SLCT
CLK
4
5
VDD
Circuit Configuration
Block
Function
AAF
Active low-pass filter to prevent aliasing noise generated in the following switched
capacitor filter (SCF) block
LPF1
Low-pass filter for limiting the band of the audio signal input from the AIN pin
DBM
Double balanced modulator for performing frequency inversion. The carrier
frequency can be changed according to the input level on the SLCT pin.
LPF2
Low-pass filter for removing upper wave components generated by mixing by DBM
SMF
Smoothing filter for removing harmonics components generated in LPF2 and clock
components
BUF
Buffer circuit for adjusting the level of the clock signal input from the CLK pin
DIV
Divides the clock signal and generates a clock signal for the SCF circuit and the
carrier frequency for DBM.
AGND
A block for generating the reference voltage (1/2VDD) of the internal analog circuit
MS0393-E-00
2005/05
-3-
ASAHI KASEI
[AK2360A]
Pin Functions
Pin No.
Pin name
Pin type
Function
1
AGND
AO
Analog ground output pin
A capacitor is connected to this pin to stabilize the analog ground level.
2
AIN
AI
Audio signal input pin
3
VSS
PWR
4
CLK
AI
5
VDD
PWR
6
SLCT
DI
Negative power supply pin
Apply 0V.
Clock signal input pin
See "Recommended External Application Circuits".
Positive power supply pin
Connect this pin to a power supply ranging from 2.6V to 3.3V with less
noise. Connect a bypass capacitor of 0.1μF or higher between this pin
and the VSS pin.
Carrier frequency switching pin
This pin changes the carrier frequency and voice passage band for the
scrambler.
Input level
High
Low
Carrier frequency
3.397kHz
3.039kHz
Voice passage band
289Hz to 3197Hz
258Hz to 2839Hz
*1)
Scrambler bypass pin
This pin causes the AAF block through LPF2 block to be bypassed.
When bypassed, these blocks are placed in the power-down state.
7
CNT
DI
Input level
High
Low
Setting
Scrambler enables.
Scrambler bypasses.
*1)
8
AOUT
AO
Audio signal output pin
Note)
A: Analog, D: Digital, PWR: Power, I: Input, O: Output
*1)
*2)
A pull-up resistor of 50kΩ or more is included.
Load impedance > 10kΩ, load capacitance < 50pF
MS0393-E-00
*2)
2005/05
-4-
ASAHI KASEI
[AK2360A]
Absolute Maximum Ratings
Parameter
Symbol
Min.
Max.
Unit
Power supply voltage
VDD
-0.3
4.6
V
Ground level
VSS
0
0
V
-0.3
VDD+0.3
V
-10
+10
mA
-55
130
°C
Input voltage
VIN
Input current (excluding power supply
IIN
pin)
Storage temperature
Tstg
Note) All voltages are relative to the VSS pin.
Caution) If the device is used in conditions exceeding these values, the device may be destroyed.
Normal operations are not guaranteed in such extreme conditions.
Recommended Operating Conditions
Parameter
Symbol
Condition
Operating temperature
Ta
Operating power supply
VDD
voltage
Analog
reference
AGND
voltage
Note) All voltages are relative to the VSS pin.
Min.
Typ.
-30
2.6
3.0
Max.
Unit
85
°C
3.3
V
1/2VDD
V
Digital DC Characteristics
Parameter
Symbol
High level input voltage
VIH
SLCT, CNT
Low level input voltage
VIL
High level input current
IIH
Low level input current
IIL
SLCT, CNT
VIH=VDD
SLCT, CNT
VIL=0V
SLCT, CNT
SLCT, CNT
Pull-up resistance
RUP
Condition
Min.
Typ.
Max.
0.8VDD
Unit
V
0.2VDD
V
10
μA
-66
μA
50
kΩ
Clock Input Characteristics
Parameter
Symbol
Condition
Clock cycle
TWP
CLK
Input amplitude
VCLK
CLK
Min.
Typ.
Max.
188
0.2
MS0393-E-00
VDD-0.1
Unit
Remarks
ns
f=5.3125MHz
VPP
Clipped sine
wave
2005/05
-5-
ASAHI KASEI
[AK2360A]
Current Consumption
Parameter
Symbol
IDD0
Current
consumption
IDD1
Condition
Min.
When scrambler is bypassed
(CNT=VIL)
with CLK=5.3125MHz, VCLK=0.2Vpp
When scrambler is operating
(CNT=VIH)
with CLK=5.3125MHz, VCLK=0.2Vpp
Typ.
Max.
0.7
1.1
Unit
mA
1.65
2.6
Analog Characteristics
Unless otherwise specified, the following apply: CLK = 5.3125MHz, SLCT = VIH, CNT = VIH, f =
[email protected], dBm = 0dBm (= 0.775Vrms) at 1mW with a 600Ω load.
Parameter
Condition
Min.
Standard
input
@AIN
level
Output level
AIN to AOUT
AIN=-11.5dBm
When CNT=VIH: (3.397-1.0)kHz
When CNT=VIL: 1.0kHz
S/N ratio
AIN to AOUT
AIN=-11.5dBm
When CNT=VIH and CNT=VIL:
30kHz low-pass filtering
S/(N+D)
AIN to AOUT
AIN=-2.7dBm
When CNT=VIH and CNT=VIL:
30kHz low-pass filtering
High frequency
AIN to AOUT
rejection level
AIN=-11.5dBm
Measurement
frequency:(3.397+1.0)kHz
Carrier signal
AIN to AOUT
leakage level
AIN=No input
Measurement frequency: 3.397kHz
Original signal
AIN to AOUT
leakage level
AIN=-11.5dBm
Measurement frequency: 1.0kHz
Note)
Typ.
Max.
-11.5
Unit
Remarks
dBm
-12.5
-11.5
-10.5
dBm
40
47
dB
43
50
dB
-65
-51.5
dBm
-75
-51.5
dBm
-85
-51.5
dBm
Under connecting 10kΩ and 50pF load to AGND(=1/2VDD) equivalent offset level AOUT pin.
MS0393-E-00
2005/05
-6-
ASAHI KASEI
[AK2360A]
Recommended External Application Circuits
1)
Power supply stabilizing capacitance
Connect capacitors between the VDD and VSS pins to eliminate ripple and noise included in
power supply. For maximum effect, the capacitors should be placed at a shortest distance
between the pins.
VDD
5
VDD
C1 = 22μF (Electrolytic cap)
C2
C1
C2 = 0.1μF (Ceramic cap)
VSS
3
VSS
LSI
2)
AGND stabilizing capacitance
It is recommended that a capacitor with 1.0μF or larger be connected between the AGND pin and
VSS to stabilize the AGND signal. The capacitor should be placed as close to the AGND pin as
possible.
1
AGND
C
C = 1.0μF (Electrolytic cap)
LSI
MS0393-E-00
2005/05
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ASAHI KASEI
3)
[AK2360A]
External AIN capacitance
Connect a capacitor to the AIN pin to adjust the input signal DC offset and the internal operation
point of the LSI device. This configures a high-pass filter with fc being about 3Hz.
2
AIN
C = 0.1μF
LSI
4)
External CLK capacitance
Connect a capacitor to the CLK pin to adjust the DC offset of the clipped sine signal and the
internal operation point of the LSI device.
4
CLK
C = 1000pF
LSI
MS0393-E-00
2005/05
-8-
ASAHI KASEI
[AK2360A]
Package
† Marking
60A
XYZ
X: Date of manufacturing
Y: Date of manufacturing
Z: Production lot number
Lowest 1 digit of the year
Month
0.10 ±0.05
† Outline dimensions
2.90 ±0.08
A
2.80 ±0.05
3.00 ±0.05
A
0.03 +0.02
-0
0.05
0.30 ±0.05
0.125 ±0.05
0.80+0.1
-0.05
0.475 TYP 0.65 ±0.05
M
0.20 ±0.08
0.05
2.3
2.2
φ1.0
MS0393-E-00
2005/05
-9-
ASAHI KASEI
[AK2360A]
Important Notice
IMPORTANT NOTICE
• These products and their specifications are subject to change without notice.
Before considering any use or application, consult the Asahi Kasei Microsystems Co., Ltd.
(AKM) sales office or authorized distributor concerning their current status.
• AKM assumes no liability for infringement of any patent, intellectual property, or other
right in the application or use of any information contained herein.
• Any export of these products, or devices or systems containing them, may require an
export license or other official approval under the law and regulations of the country of
export pertaining to customs and tariffs, currency exchange, or strategic materials.
• AKM products are neither intended nor authorized for use as critical components in any
safety, life support, or other hazard related device or system, and AKM assumes no
responsibility relating to any such use, except with the express written consent of the
Representative Director of AKM. As used here:
(a) A hazard related device or system is one designed or intended for life support or
maintenance of safety or for applications in medicine, aerospace, nuclear energy, or
other fields, in which its failure to function or perform may reasonably be expected to
result in loss of life or in significant injury or damage to person or property.
(b) A critical component is one whose failure to function or perform may reasonably be
expected to result, whether directly or indirectly, in the loss of the safety or
effectiveness of the device or system containing it, and which must therefore meet very
high standards of performance and reliability.
• It is the responsibility of the buyer or distributor of an AKM product who distributes,
disposes of, or otherwise places the product with a third party to notify that party in advance
of the above content and conditions, and the buyer or distributor agrees to assume any and
all responsibility and liability for and hold AKM harmless from any and all claims arising
from the use of said product in the absence of such notification.
MS0393-E-00
2005/05
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