ASAHI KASEI [AK2360] AK2360 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 (3.376kHz or 3.020kHz) and voice passage band Scrambler bypass function included Based on 2.545MHz (1/4 for 10.1MHz) external clock supply Operating voltage: 2.6V to 3.3V Operating temperature: Package: -30°C to +85°C 8-pin SON CNT Block Diagram AIN AOUT AAF LPF1 BUF DIV DBM SMF LPF2 AGND MS0392-E-00 VSS VDD SLCT CLK + AGND Power down at “CNT=L” + 2005/05 -1- ASAHI KASEI [AK2360] 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 MS0392-E-00 2005/05 -2- ASAHI KASEI [AK2360] General Description The AK2360 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. 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 MS0392-E-00 The carrier frequency can 2005/05 -3- ASAHI KASEI [AK2360] 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 3.376kHz 3.020kHz Voice passage band 290Hz to 3090Hz 260Hz to 2760Hz *1) Scrambler bypass pin This pin causes the AAF block through LPF2 block to be bypassed. bypassed, these blocks are placed in the power-down state. 7 CNT DI Input level High Low When 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 MS0392-E-00 *2) 2005/05 -4- ASAHI KASEI [AK2360] Absolute Maximum Ratings Parameter Symbol Min. Max. Unit Power supply voltage VDD -0.3 4.6 V Ground level VSS 0 0 V Input voltage VIN -0.3 VDD+0.3 V Input current (excluding power supply pin) IIN -10 +10 mA Storage temperature Note) All voltages are relative to the VSS pin. Tstg -55 130 °C 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 voltage AGND 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 Condition High level input voltage VIH SLCT, CNT Low level input voltage VIL High level input current IIH Low level input current IIL Pull-up resistance RUP SLCT, CNT VIH=VDD SLCT, CNT VIL=0V SLCT, CNT SLCT, CNT 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. 396 0.2 MS0392-E-00 VDD-0.1 Unit Remarks ns f=2.525MHz VPP Clipped sine wave 2005/05 -5- ASAHI KASEI [AK2360] Current Consumption Parameter Current consumption Symbol IDD0 IDD1 Condition Min. When scrambler is bypassed (CNT=VIL) with CLK=2.525MHz, VCLK=0.2Vpp When scrambler is operating (CNT=VIH) with CLK=2.525MHz, VCLK=0.2Vpp Typ. Max. 0.7 1.1 Unit mA 1.6 2.5 Analog Characteristics Unless otherwise specified, the following apply: CLK = 2.525MHz, SLCT = VIH, CNT = VIH, f = 1kHz@AIN, dBm = 0dBm (= 0.775Vrms) at 1mW with a 600Ω load. Parameter Condition Min. Standard input level @AIN Output level AIN to AOUT AIN=-11.5dBm When CNT=VIH: (3.376-1.0)kHz When CNT=VIL: 1.0kHz AIN to AOUT AIN=-11.5dBm When CNT=VIH and CNT=VIL: 30kHz low-pass filtering AIN to AOUT AIN=-2.7dBm When CNT=VIH and CNT=VIL: 30kHz low-pass filtering AIN to AOUT AIN=-11.5dBm Measurement frequency:(3.376+1.0)kHz AIN to AOUT AIN=No input Measurement frequency: 3.376kHz AIN to AOUT AIN=-11.5dBm Measurement frequency: 1.0kHz S/N ratio S/(N+D) High frequency rejection level Carrier signal leakage level Original signal leakage level 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. MS0392-E-00 2005/05 -6- ASAHI KASEI [AK2360] 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 MS0392-E-00 2005/05 -7- ASAHI KASEI 3) [AK2360] 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 MS0392-E-00 2005/05 -8- ASAHI KASEI [AK2360] Package Marking 60 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 MS0392-E-00 2005/05 -9- ASAHI KASEI [AK2360] 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. MS0392-E-00 2005/05 - 10 -