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 fre quency (3.376khz or 3.020khz) and voice passage band ? scram b ler bypass function included ? based on 2.545mhz (1/4 for 10.1mhz) external clock supply ? operating voltage: 2.6v to 3.3v ? operating temperature: -30 c to +85 c ? package: 8-pin son block diagram agnd + vdd vss + clk cnt a in a out slct a gnd dbm smf lpf2 lpf1 a af power down at ?cnt=l? buf div ms0392-e-00 2005/05 - 1 - http://
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 ch aracteristics...................................................................... 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 scram bler ic device suitable for half-duplex com m unication. as the scram bler m e thod, a sim p le frequency inversion m e thod is used in which audio signal com ponents are inverted about the carrier frequency by using the double balanced m ixer (dbm). the inverted frequency and voice passage band can be cha nged according to the input to the slct pin. the scram bler can be by passed by using the cnt pin, and pa rt 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 assignm ents (top view) agn d ain vs s clk 3 4 a ou t cn t sl ct vdd 8 7 5 2 1 6 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 d ouble balanced m odulator for perform ing 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 sm oothing filter for rem oving harm onics com ponents generated in lpf2 and clock components buf buffer circuit for adjusting the level of the clock signal input from the clk pin div d i vides 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 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 negative power supply pin apply 0v. 4 clk ai clock signal input pin see "recommended external application circuits". 5 vdd pwr positive power supply pin connect this pin to a pow er supply ranging from 2.6v to 3.3v w ith less noise. connect a bypass capacitor of 0.1 f or higher between this pin and the vss pin. 6 slct di carrier frequency switching pin this pin changes the carrier frequency and voice passage band for the scrambler. input level carrier frequency voice passage band high 3.376khz 290hz to 3090hz low 3.020khz 260hz to 2760hz *1) 7 cnt di scrambler bypass pin this pin causes the a a f block through lpf2 block to be by passed. when bypassed, these blocks are pl aced in the power-down state. input level setting high scrambler enables. low scrambler bypasses. *1) 8 aout ao audio signal output pin *2) note) a : analog, d : digital, pwr : power, i : input, o : output *1) a pull-up resistor of 50k or more is included. *2) load impedance > 10k , load capacitance < 50pf ms0392-e-00 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 v in -0.3 vdd+0.3 v input current (excluding power supply pin) i in -10 +10 ma storage temperature t stg -55 130 c 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. n o rm al operations are not guaranteed in such extrem e conditions. recommended operating conditions parameter symbol condition min. typ. max. unit operating temperature ta -30 85 c o p erating pow er supply voltage vdd 2.6 3.0 3.3 v analog reference voltage agnd 1/2vdd v note) all voltages are relative to the vss pin. digital dc characteristics parameter symbol condition min. typ. max. unit high level input voltage v ih slct, cnt 0.8vdd v low level input voltage v il slct, cnt 0.2vdd v high level input current i ih v ih =vdd slct, cnt 10 a low level input current i il v il =0v slct, cnt -66 a pull-up resistance r up slct, cnt 50 k clock input characteristics parameter symbol condition min. typ. max. unit remarks clock cycle t wp clk 396 ns f=2.525mhz input amplitude v clk clk 0.2 vdd-0.1 v pp clipped sine wave ms0392-e-00 2005/05 - 5 -
asahi kasei [AK2360] current consumption parameter symbol condition min. typ. max. unit idd0 when scrambler is bypassed (cnt=v il ) with clk=2.525mhz, v clk =0.2vpp 0.7 1.1 current consumption idd1 when scrambler is operating (cnt=v ih ) with clk=2.525mhz, v clk =0.2vpp 1.6 2.5 ma analog characteristics u n less otherw ise specified, the follow i ng apply : clk = 2.525mh z, slct = v ih , cnt = v ih , f = 1khz@ain, dbm = 0dbm (= 0.775vrms) at 1mw with a 600 load. parameter condition min. typ. max. unit remarks standard input level @ain -11.5 dbm output level ain to aout ain=-11.5dbm when cnt=v ih : (3.376-1.0)khz when cnt=v il : 1.0khz -12.5 -11.5 -10.5 dbm s/n ratio ain to aout ain=-11.5dbm when cnt=v ih and cnt=v il : 30khz low-pass filtering 40 47 db s/(n+d) ain to aout ain=-2.7dbm when cnt=v ih and cnt=v il : 30khz low-pass filtering 43 50 db h igh frequency rejection level ain to aout ain=-11.5dbm measurement frequency:(3.376+1.0)khz -65 -51.5 dbm carrier signal leakage level ain to aout ain=no input measurement frequency: 3.376khz -75 -51.5 dbm original signal leakage level ain to aout ain=-11.5dbm measurement frequency: 1.0khz -85 -51.5 dbm note) under connecting 10k 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 elim inate ripple and noise included in power supply . for m a xim u m effect, the capacitors should be placed at a shortest distance between the pins. lsi c2 vdd vss c1 c1 = 22 f (e l e ct ro l y t i c ca p ) c2 = 0.1 f (ceramic cap) vdd vss 5 3 2) agnd stabilizing capacitance it is recom m e nded that a capacitor with 1.0 f 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. agnd lsi c c = 1.0 f (electrolytic cap) 1 ms0392-e-00 2005/05 - 7 -
asahi kasei [AK2360] 3) 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. ain lsi c = 0.1 f 2 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. clk lsi c = 1000pf 4 ms0392-e-00 2005/05 - 8 -
asahi kasei [AK2360] package ? marking 60 xyz x : d ate of m anufacturing low est 1 digit of the y ear y : d ate of m anufacturing month z: production lot num ber ? outline dimensions 0. 05 0.65 0.05 0. 30 0. 05 3.00 0.05 0.80 0.1 0.05 0.10 0.05 0.125 0.05 2.80 0.05 0.475 typ 2.90 0.08 2.3 2.2 0.03 +0.02 -0 a a 0.20 0.08 1. 0 -0.05 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, c onsult 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 rela ted 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 contai ning 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 -
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