austriamicrosystems AG is now ams AG The technical content of this austriamicrosystems datasheet is still valid. Contact information: Headquarters: ams AG Tobelbaderstrasse 30 8141 Unterpremstaetten, Austria Tel: +43 (0) 3136 500 0 e-Mail: [email protected] Please visit our website at www.ams.com Telephone Line Interface and Speakerphone Circuit austriamicrosystems AS2523, AS2524, AS2524B - impedance of 1000Ω) as well as a speech circuit with softclipping, line loss compensation and Rx-volume control for handset and handsfree operation. It shall act as an a/bline powered device, which is controlled by a CPU via a serial interface on AS2523 or a standard dialler via a parallel interface on AS2524 and AS2524B. Applications Enhanced handsfree feature phones with CallerID and extended displays. The AS2524 and AS2524B are developed to interface with common Taiwanese dialers. Package Available in 28-pin SOIC or die Te ch ni ca Block Diagram AS2523/24 is a CMOS integrated circuit that incorporates DC and AC line adaptation (DC-mask and synthesized AC- al id - Line/Speakerphone circuit on a 28-pin CMOS-IC, simple inventory: same die for AS2523/24 and AS2523/24B Serial I/F on AS2523, parallel I/F on AS2524 Enhanced voice switching Background noise monitoring Tx- and Rx-gain programmable on AS2523 only Digital volume control of Rx signals on AS2523 only DC characteristic programmable on AS2523 only Dual softclipping in handset mode on AS2523 only Dual softclipping in handsfree mode on AS2523 only Loudspeaker amplifier for loudhearing and handsfree Supply voltage generation for external circuitry Automatic line loss compensation on AS2523 / 24B only Real and complex impedance selectable by external components Side tone adaptation selectable by external components Unique EMC performance Operating range from 15mA to 100mA (down to 5mA with reduced performance) Few external components am lc s on A te G nt st il - General Description lv Key Features DATA SHEET Revision 1.13 Page 1 of 19 austriamicrosystems Data Sheet AS2523, AS2524, AS2524B Pin description Pin # Symbol 15 LS Function L ine Current S ense Input Analog input for sensing the line current LI L ine I nput al id 12 Analog input used for power extraction and line current sensing 13 RI R eceive I nput 9 STB S ide T one B alance Input Analog input for side tone cancellation network CS C urrent S hunt Control Output am lc s on A te G nt st il 10 lv Analog input for ac-separated receive signal N-channel open drain output to control the external high power shunt transistor for synthesizing AC- and DC-impedance, modulation of line voltage and shorting the line during make periods of pulse dialing 16 CI C omplex I mpedance Input Analog input pin for the capacitor to program a complex impedance 14 SS S upply S ource Control Output N-channel open drain output to control the external high power source transistor for supplying (Vpp) the loudspeaker amplifier in off-hook loudspeaking/handsfree mode 11 VSS V oltage S ource S ource Negative Analog Power Supply 18 VDD V oltage D rain D rain Positive Analog Power Supply 19 AGND A nalog G round 8 M1 ca Special ground for the internal amplifiers M icrophone Input 1 6 ni Differential input for the handset microphone (electret) M2 M icrophone Input 2 ch Differential input for the handset microphone (electret) 7 M3 M icrophone Input 3 Te Differential input for the handsfree microphone (electret) 5 17 M4 M icrophone Input 4 Differential input for the handsfree microphone (electret) RO R eceive O utput to H andset Output for driving a dynamic earpiece with an impedance from 150Ω to 300Ω Revision 1.13 Page 2 of 19 austriamicrosystems Data Sheet AS2523, AS2524, AS2524B Pin # Symbol 25 xCS Function C hip S elect on AS2523 Chip select input of the serial interface. Internal pull-up resistor ( 100kOhm ) /xMUTE 26 DI Mute transmit-, receive- path and activate tone path on AS2524 and AS2524B D ata I nput on AS2523 27 /xPD Power down mode for AS2524 and AS2524B (On-hook) CLK Cl oc k on AS2523 /HFE Handsfree mode operation on AS2524 and AS2524B 23 LO L oudspeaker O utput. Output pin is for a 25Ω 2 FT1 Analog input pin for connecting a capacitor for offset cancellation. 3 TXO 4 TXV 1 CBN 20 RECI 21 RECV 24 VSSA 22 VPP 28 TONEIN am lc s on A te G nt st il loudspeaker lv Clock input of the serial interface. Internal pull-up resistor ( 100kOhm ) al id Data input of the serial interface. Internal pull-up resistor ( 100kOhm ) Analog output of the transmit signal Analog input for the transmit signal in the voice switching path Analog input pin for connecting a capacitor for background noise monitoring. Analog input for the handsfree receive path. Should be connected to RO via coupling capacitor. Analog input for receive voice switching path. Power supply pin for LO output amplifier. Power supply pin for LO output amplifier. Te ch ni ca Analog input for DTMF-signals. Revision 1.13 Page 3 of 19 Data Sheet AS2523, AS2524, AS2524B austriamicrosystems Te ch ni ca am lc s on A te G nt st il lv al id Detailed Block Diagram Revision 1.13 Page 4 of 19 austriamicrosystems Data Sheet AS2523, AS2524, AS2524B Functional Description The gain of the M3/M4 → LS is set to +46dB. This gain can be changed by programming from +39dB to +54dB in 1dB steps on AS2523. The input is differential DC conditions with an impedance of 10kΩ. The soft clip circuit limits the output voltage at LS to 2V p . There is no LLC for this path. The normal operating mode is from 15mA to 100mA. An operating mode with reduced performance is from 5mA to 15mA. In the line hold range from 0mA to 5mA the device is in a power down mode. Receive path al id The gain of the LS → RO receive path is set to +7.5dB. This gain can be changed by programming from –7.5dB to +7.5dB in 1dB steps (Register Rxgain). The receive input is the differential signal of RI and STB. The soft clip circuit limits the output voltage at RO to 1V p. It prevents harsh distortion and acoustic shock. There is LLC for this path. The DC characteristic is determined by the voltage at LIpin and a 30Ω resistor between LI- and LS-pin. It can be calculated by the following equation: V LS = V LI + I Line * 30Ω. V LI can be programmed to be 3.5V or 4.5V. lv 2/4 wire conversion The gain of the LS → LO receive path is set to +32dB. This gain can be changed by programming from +19dB to 34dB in 1dB steps. The user can also change the gain via Register Handsfree receive end gain (See section "Handsfree"). The receive input is the differential signal of RI and STB. The soft clip circuit limits the output voltage at LO to 1.1V p. It prevents harsh distortion and acoustic shock. There is optional LLC for this path. AC-impedance am lc s on A te G nt st il AS2523/24 has built in two Wheatstone bridges with one common ground. This provides a maximum of independence of AC-impedance and side tone from each other. One can adapt side tone without changing the ACimpedance. The AC-impedance of AS2523/24 is set to t.m. 1000Ω. With the external capacitor at CI-pin it can be programmed Line Loss Compensation (AS2523, AS2524B) programmable on AS2523 - not activated at AS2524 - permanently activated at AS2524B When it is activated, the transmit and receive gains for both I/O’s are decreased by 6dB at line currents from 20mA to 50mA or from 45mA to 75mA. complex. With an external resistor of approx. 1.5kΩ - connected to the LS-pin it can be programmed to 600Ω. Side Tone A good side tone cancellation can be achieved by using the following equation: Z BAL /Z LINE = 10 Transmit path Handsfree The handsfree function allows voice communication without using the handset (full 2-way speaker phone). Two voice controlled attenuators prevent acoustic coupling between the loudspeaker and the microphone. The voice switching circuit has three states, namely idle, transmit or receive. In receive mode the attenuation of the receive path and the transmit path can be controlled by Register Handsfree receive end gain between 0dB and -20dB. The following table shows how voice switching is controlled ca The gain of the M1/M2 → LS is set to +37dB. This gain can be changed by programming on AS2523 from +30dB to +45dB in 1dB steps (Register Txgain), on AS2524 / 24B it is set to +37dB per default. The input is differential with an Te ch ni impedance of 10kΩ. The soft clip circuit limits the output voltage at LS to 2V p. There is LLC for this path. Revision 1.13 voice switching circuit TX_atten RX Voice switching speech Backgnd noise monitor Page 5 of 19 austriamicrosystems Data Sheet AS2523, AS2524, AS2524B Gmax = +9dB Gmin = -21dB … -40dB (Vol) LINE +23dB +14dB +8dB ~ +17dB TXO speech Peak detector Voice switching TXV RO Compress Compress Offset comp FT1 0mV ~ 100mV Peak detector Peak detector CBN Cmicoffset CBckgnd RECV RECI +9dB am lc s on A te G nt st il lv Gmax = -4dB … +16dB (Vol) Gmin = -33dB al id Compress +3dB Rx > Tx_atten Tx_atten > Rx Tx_atten > Rx Speech Mode Rx-gain Tx-gain Remark X Receive 0db to -20dB -50dB to -30dB adjustable with VOL-setting NO Idle -25 -25 middle position YES Transmit -50dB 0dB independent of VOL-setting IDLE-mode RX-mode TX-mode 0dB -10dB ca TX-gain Vol default Vol min -25dB -30dB -40dB RX-gain -50dB Te ch ni Vol max -20dB Revision 1.13 Page 6 of 19 austriamicrosystems Data Sheet AS2523, AS2524, AS2524B Typical Characteristics of Line Loss Compensation (AS2523, AS2524B only) Tx Gain 35 34 33 32 31 30 29 No LLC (AS2523, AS2524) LLC high (AS2523,AS2524B) LLC low (AS2523) lv (dB) al id The line-loss-compensation is programmable at the AS2523, not activated at the AS2524 and LLC high (45mA-75mA) activated at the AS2524B. f = 800 Hz Z LINE = 600Ω V LS = -10 dBm am lc s on A te G nt st il DC Line Current 20 30 40 50 60 70 80 (mA) Figure 1 Typical Tx Gain Characteristics Line Loss Compensation (dB) Rx Gain +4 +3 +2 +1 0 -1 -2 No LLC (AS2523, AS2524) LLC low (AS2523) LLC high (AS2523,AS2524B) f = 800 Hz Z LINE = 600Ω V LS = -10 dBm VOL = 0 dB (neutral) 30 ca 20 DC Line Current 40 50 60 70 80 (mA) Te ch ni Figure 2 Typical Rx Gain Characteristics Line Loss Compensation Revision 1.13 Page 7 of 19 austriamicrosystems Data Sheet AS2523, AS2524, AS2524B Serial Interface on AS2523 Registers The settings of the AS2523 are stored in 16 registers. Each register has 4 bit data width. Timing al id The data format for writing to a register has the following form: CLK D2 D1 D0 am lc s on A te G nt st il Note: D3 A0 A1 A2 A3 DI lv xCS The pins xCS,CLK,DI have internal pull-up resistors. Parameter Symbol MIN CLK Pulse width HIGH T6 100ns CLK Pulse width LOW T5 100ns xCS to first falling CLKedge setup time T1 50ns DIN to CLK setup time T3 50ns T4 50ns DIN to CLK hold time ca t4 ch CLK t3 ni xCS MAX t6 t5 t1 TYP Te DIN Revision 1.13 Page 8 of 19 austriamicrosystems Data Sheet AS2523, AS2524, AS2524B Serial interface Registers The following table shows the content of the 16 control registers. Data A A A A 3 2 1 0 D D D D 3 2 1 0 0 0 0 0 0 Nop x x Conf-Tone: 0... No Conf Tone 1... Conf Tone 1 0 0 0 CT1 CT0 16 gains x x x 0001 0001 Soft-TX 1000 1000 Bit1 Bit0 :Tx_comp_gain 0 0 +8dB 0 1 +11dB 1 0 +14dB 1 1 +17dB SOFTRX: Softclip RX 0...OFF, SOFTTX: Softclip TX 0...OFF, 0101 1100 1111 1011 0000 1100 Hfs1 HFs0: Speed of voice switching 0 0 max speed 0 1 1 0 1 1 min speed Transmit gain [16], 16 steps, 1dB stepsize 0111 0111 Data HS-mode HF-mode 0x0 30dB 39dB : : : 0xF 45dB 54dB Receive gain [16], 16 steps, 1dB stepsize 1111 1111 0100 1000 0100 0101 0000 0001 na na 1...ON 1...ON Bit1 Bit0: Rx-offset setting 0 0 0mV 0 1 12mV 1 0 40mV 1 1 100mV Delay_10ms 0... no delay Bnon 0... BGN off Handsfree receive endgain Data 0x0 : 0xF 1 0 0 1 na na na na 0111 BURS: Analog tone at RO 0...OFF, 1...ON BURL: Analog tone at LS 0...OFF, 1...ON CT1 CT0: @RO @LS 0 0 -36dB -15dB TONE-confidence level 0 1 -30dB -9dB rel. to pin LS 1 0 -24dB -3dB 1 1 -18dB +3dB Softclip-settings, Tx_comp_gain settings Bnon Delay_10ms Rxoffset Bit0 Rxoffset Bit1 0 1 1 1 na na na na 0111 am lc s on A te G nt st il Burl x Soft-RX Burs x tx_comp_gain Bit0 x tx_comp_gain Bit 1 x for AS2524 LH bond option LIV: Voltage at pin LI 0...3.5V, 1...4.5V LLC1 LLC0: Line loss compensation setting 0 0 20mA-50mA 0 1 NO Line loss compensation 1 0 45-75mA 1 1 NO Line loss compensation 0 1 0 1 0 1 1 0 for AS2523, AS2524HF lv x Llc0 x Llc1 0 1 0 1 0 Liv 0 0 1 1 0 Conf 0 0 0 0 1 Default value after reset Control registers AS2523 al id Address RXgain -20dB : +0dB TXgain -30dB 1... 10ms delay 1... BGN on Min. receive volume -50dB Max. receive volume x ca Hfs0 Hfs1 16 gains ni 1 0 1 0 off0 off1 off1 off0: BGN-offset 0 0 120mV 0 1 180mV 1 0 240mV 1 1 300mV 16 gains ch 1 0 1 1 Tone x x x x His 0 1 1 1 1 HF x 0 0 1 1 LH: x 0 1 0 1 fg=200Hz Rxcomp=AGND No mute Tx-signal path 1... 1... 1... 1... fg=2000Hz Rxcomp=RECV Tx-path muted Ton in signal path No mask 1... Mask acitivated Hook functions Power down Handset not allowed Handsfree Loudhearing slow_rec LH Mute Hf Rec_on x His HP_on x HP_on : 0... rec_on : 0... Mute : 0... Tone : 0... Mask, Lh, Hf, Hook Switch Mask: 0... Test2 1 1 1 1 x HF-mode 19dB : 34dB Test3 1 1 1 0 x Mask 1 1 0 1 HS-mode -6dB : +9dB Krat5 Te 1 1 0 0 Data 0x0 : 0xF slow_rec: fast change to TX, slow change to RX, no IDLE Krat5,Test3,Test2: For factory test only ! x x x x Reset to defaults For a detailed description of the commands see Application note AN523/24. Revision 1.13 Page 9 of 19 austriamicrosystems Data Sheet AS2523, AS2524, AS2524B Programming Guidelines for the AS2523 Additional settings in Handsfree mode The AS2523 is programmed by means of a serial 8-bit shift register. MSB is clocked in first, LSB last. The first four bits (7,6,5,4) are the addresses of the registers, the last four bits (3,2,1,0) are the data bits. Note: change the default settings only if necessary: Each register has a default setting (see data sheet), which is set after power-up of the chip. b) Change the Tx comparator preamplifier gain in register 6 Default = 14dB The internal registers are RAM-cells. When the AS2523 loses VDD (as in on-hook state) it also loses the register contents. c) Change the Receive DC offset and Background noise monitoring in Register 7 default = 0mV offset (higher val. puts more weight on Rx) switching delay default = on Background Noise Monitoring = on al id e) Set the handsfree voice switching speed and Background Noise monitoring offset in register 9: default voice switching speed = 1ms/6dB (fastest) default BGN monitoring offset = 240mV (determines the Tx level required to switch from idle to Transmit) am lc s on A te G nt st il Registers need to be re-written after each power-up and after each hook event (handset / handsfree / on-hook). d) Set the speaker amplifier volume in register 8 Default = 0B lv It is therefore necessary to re-write the affected registers after each hook event. The register contents cannot be read, they can only be written. a) A click-free startup can be achieved by starting up in handset mode (=default) and then switching to handsfree, once the chip has stabilized. It is recommended to always initialize the chip with a “reset to defaults command” (Fx) first and then write the appropriate registers that need to be changed from the default setting. Alternatively, all registers (4 to 16) may be re-written in a bulk at each power-up and hook event (handset / handsfree / on-hook). ca This guarantees safe operation in case of unexpected loss of power during normal operation. Re-writing all registers also eases later software updates, as only register contents need to be changed, but no additional command lines need to be inserted. Example of a typical power-up sequence ni A typical power-up sequence will require the following programming. ch a) determine the cause of power-up (handset / handsfree mode) and set register D accordingly. Default = handset mode Te b) Set the LI voltage to 3.5V or 4.5V (default = 4.5V) and Line Loss Compensation (default = off) in register 4 c) Set the Confidence Tone level (e.g. the DTMF level which is audible in the handset) and path in register 5 Default = off d) Set the required Tx and Rx gains in Registers A and B Default = 37dB Tx gain, 1dB Rx gain Revision 1.13 Additional settings during Flash During a Flash, the AS2523 should be powered down to avoid discharge of VDD: Set the MASK bit (bit3 in register D) to 1 After the line current is restored, the MASK bit must be cleared again. Other settings do not need to be re-written, as VDD has not discharged. As a safety margin however, it is recommended to re-write all registers after a flash Additional settings during line breaks If a line-break-detection (brief interruption of the line while in off-hook state) is implemented, the same rules apply as for a Flash: set the MASK bit to 1 to avoid discharge of VDD. It is recommended to re-write all registers after a line-break, as a line break may take long enough to discharge VDD, even when the MASK bit was set. General Rules The serial interface may be programmed at any time, it does not affect the speech quality, e.g. if a register is overwritten with the same value. It is also possible to re-write all registers periodically. The register is static, therefore it can be clocked at any speed up to 5MHz. However, electromagnetic pulses on the clock and data lines may cause unwanted programming of the chip. It is therefore recommended to keep these lines short, filter them by a discrete lowpass filter and reduce the clock speed accordingly. Page 10 of 19 austriamicrosystems Data Sheet AS2523, AS2524, AS2524B Parallel Interface on AS2524 and AS2524B Input Signal on Pin xMute HF 0 0 0 Power down Mode 0 0 1 Power down 0 1 0 Power down 0 1 1 Power down 1 0 0 Tone mode 1 0 1 Tone mode 1 1 0 Handset mode 1 1 1 Handsfree mode al id XPD lv Power down mode Handset mode am lc s on A te G nt st il For low power consumption the analog part is turned off during activated power down mode. The Power down mode is used during Flash and Pulse dialing and for On-hook operation. Speech mode is Handset mode (M1-M2, RO active; LO deactivated) Parameter LI Voltage LLC TX-Gain RX-Gain Rx-Softclip Tx-Softclip Tone Handsfree mode AS2524 AS2524B 4.5V 4.5V No LLC LLC high (45mA to 75mA) +37dB +43dB +7.5dB +7.5dB Off Off Off Off Off Off Speech mode is Handsfree mode (M3-M4, RO active; LO active) AS2524 AS2524B 4.5V 4.5V No LLC LLC high (45mA to 75mA) +46dB +52dB HF RX-Gain +34dB +34dB Rx-Softclip Off Off Tx-Softclip Off Off Tone Off Off On On LI Voltage LLC Te ch ni HF TX-Gain ca Parameter BNM Revision 1.13 Page 11 of 19 austriamicrosystems Data Sheet AS2523, AS2524, AS2524B Tone mode Parameter AS2524 AS2524B 4.5V 4.5V LLC No LLC LLC high (45mA to 75mA) Tone TX-Gain +14dB +14dB -36dB@Ro –15dB@Lo relative to Pin LS -36dB@Ro –15dB@Lo relative to Pin LS LI Voltage Confidence tone level al id This mode is used to send DTMF and FSK data to the line. Speech mode is Tone mode (M1-M2;M3-M4 muted, Rx path muted, RO and LO active) Loudhearing AS2524 and AS2524B (feature only available as DIE) LI Voltage LLC TX-Gain RX-Gain Tone Slow_rec RECV pin Highpass Voice switching speed RX-Offset AS2524 AS2524B am lc s on A te G nt st il Parameter lv Speech mode is Loudhearing (M3-M4, RO active; LO activated). Loudhearing can be activated via a bond-option (see document “AS2523/24 Delivery as Dice”). 4.5V 4.5V No LLC LLC high (45mA to 75mA) +37dB +43dB +7.5dB +7.5dB Off Off On On Deactivated Deactivated 2000kHz (10nF from TXO->TXV) 2000kHz (10nF from TXO->TXV) 120ms/6dB 120ms/6dB 300mV 300mV Electrical characteristics ca Electrical characteristics are measured with the Test Circuit application. Typical mean values will not be tested. Absolute maximum ratings ni Positive Supply Voltage Input Current ch Input Voltage (LS) Input Voltage (LI, CS) Input Voltage (STB, RI) Te Digital Input Voltage Electrostatic Discharge (HBM 1.5kΩ-100pF) Storage Temperature -0.3V <= V DD <= 7V +/- 25mA -0.3V <= V in <= 12V -0.3V <= V in <= 8V -2V <= V in <= V DD +0.3V -0.3V <= V in <= V DD +0.3V +/- 1000V -65°C to +125°C Recommended operating conditions Supply Voltage (generated internally) Operating Temperature Revision 1.13 3V <= V DD <= 5V -25°C to +70°C Page 12 of 19 austriamicrosystems Data Sheet AS2523, AS2524, AS2524B DC characteristics I Line =15mA w/o operation of any additional external circuitry, unless other specified Parameter Conditions Min Type Max Units Test Y Operating Current Speech Mode 3 6 mA I DDH Operating Current Handsfree Mode 7 10 mA V LI Line Voltage LIVolt=0 Line Voltage LIVolt=1 15mA<=ILINE<=100mA 3.5 4.5 3.8 4.8 V V I OL Output Current, Sink CS,SS 3.2 4.2 Y Y 1 mA N am lc s on A te G nt st il VOL=0.4V Y lv I DDS al id Symbol Transmit characteristics I Line =15mA f=800Hz, default settings unless other specified Symbol Parameter Conditions Min Type Max Units Test 35 39 +36.5 +42.5 38 44 dB dB Y Y 43 49 +45.0 +51 47 53 dB dB Y Y 12 +14dB 16 dB Y A M1/2TX Transmit Gain M1/M2 → LS AS2524 AS2524B Z AC(syn)= 1000Ω A M3/4TX Transmit Gain M3/M4 → LS AS2524 AS2524B Z AC(syn) =1000Ω A tone TX Transmit Gain Z AC(syn) =1000Ω ∆ A TX Variation with frequency f = 500Hz … 3.4kHz ±0.8 dB N A VRM12 Control range 16 steps -7/+8 dBr N 16 steps -7/+8 dBr N % Y 2 VP N 2 VP N ca Tone → LS M1/M2 → LS M2/M4 → LS Distortion ch THD Control range ni A VRM34 V AGC1 Soft Clip Level V LS =0.25VRMS 2 Te M1/M2 → LS at LS V AGC2 Soft Clip Level A SCO Soft Clip Overdrive M1/M2 - M3/M4 20 dB N t attack Attack time 70 us/6dB N t decay Decay time 100 ms/6dB N Revision 1.13 M3/M4 → LS at LS Page 13 of 19 austriamicrosystems Data Sheet AS2523, AS2524, AS2524B Symbol Parameter Conditions Min Type Max Units Test Input Impedance M1/M2 10 kΩ N Z IN-M3/4 Input Impedance M3/M4 10 kΩ N V INmax Input Voltage Range M1/2 - M3/4 differential ±1 Vp N V NO Noise Output Voltage LS T AMP =25°C dBmp dBmp -66 Mute activated N Y lv Mute Attenuation -72 60 dB am lc s on A te G nt st il A MUTE Handset mode Gain = 36.5dB Gain = 42.5dB al id Z IN-M1/2 Y Receive characteristics I Line =15mA f=800Hz, default settings unless other specified Symbol A RO Parameter Conditions Receive Gain Z AC(syn) =1000Ω LS → RO Vol default Type Max Units Test 6 +7.5 9 dB Y +32.0 +34 +36.0 dB Y A LO12 Receive Gain ∆ A RX Variation with frequency f=500Hz to 3.4kHz ±0.8 dB N A VRRO Control range 16 steps -7/+8 dBr N 16 steps -7/+8 dBr N LS → LO LS → RO Z AC(syn) =1000Ω Vol maximum Min Control range THD LS Distortion LO V LS =0.25VRMS 5 % Y Distortion RO V LS =0.25VRMS 2 % Y Unwanted Freq. Cmp. f = 200 … 20kHz -60 dBm Y 1 VP N ch V UFC LS → LO ni THD RO ca A VRLS V AGCRO Soft Clip Level Te RO V AGCLS Soft Clip Level LO 1.1 VP N A SCLS Soft Clip Overdrive LO 10 dB N T attack Attack time 70 us/6dB N T decay Decay time 100 ms/6dB N Revision 1.13 Page 14 of 19 austriamicrosystems Data Sheet AS2523, AS2524, AS2524B Symbol V NO Parameter Conditions Min Type T AMP =25°C Noise Output Voltage RO Max Units Test -68 dBmp Y Gain = 7.5dB Input Imp. RI Input Voltage Range RI 8 ±2 kΩ Vp N Z IN-STB V INmax Input Imp. STB Input Volt. Range STB 80 ±2 kΩ Vp N ST Side tone V RI <=0.25VRMS 26 RL ∆ Z AC/°C Return Loss Temp. Variation Z AC(syn) =1000Ω 18 dB dB 0.5 al id Z IN-RI V INmax Y Y Test circuit am lc s on A te G nt st il lv Ω/°C U2 15 I1 10 0u F C2 C1 R1 30R 13 12 D1 10V R1 300R R1 600R Idc 10uF VSS TONE IN RI M3 LI M4 C2 1uF 9 VSS Vac LS R1 6k 10 VSS 16 VSS Q1 BC327 11 24 VSS M1 28 C6 100nF 7 C6 100nF 5 C6 Vac 100nF 8 C6 100nF 6 C6 Vac 100nF STB M2 CS RO CI AS2523/24 VSS VSSA RECI RECV Vac V3 17 C2 10uF 20 C4 100nF 21 C6 VSS R3 R4 10k Q1 14 22 C2 47uF LO SS R5 10k VSS VSS 3 2 1 1 C2 1uF TX V TX O FT 1 VD D 25 26 27 100uF R2 32R VSS 4 3 1u F 2 C2 22 uF 19 C2 18 10 0u F C2 ca C7 C3 1n VSS Te ch D1 5V1 AG ND CBN VSS ni xCS / xMUTE DI / xPD CLK / HFI VPP 23 VSS 100nF VSS BC327 150R Revision 1.13 Page 15 of 19 Data Sheet AS2523, AS2524, AS2524B austriamicrosystems Te ch ni ca am lc s on A te G nt st il lv al id Typical application AS2523 Revision 1.13 Page 16 of 19 Data Sheet AS2523, AS2524, AS2524B austriamicrosystems Te ch ni ca am lc s on A te G nt st il lv al id Typical application AS2524 and AS2524B Revision 1.13 Page 17 of 19 austriamicrosystems Data Sheet AS2523, AS2524, AS2524B Packaging 28-pin plastic SOIC For exact mechanical package dimensions please see austriamicrosystems AG packaging information. am lc s on A te G nt st il lv al id Pin-out, Marking YY WW AAA year of production calendar week of production austriamicrosystems AG assembly ID X 3 … AS2523 Version 4 … AS2524 Version 4B .. AS2524B Version Ordering Information Package Description AS2523 T SOIC28 plastic surface mounted package – 28 leads AS2524 T SOIC28 Plastic surface mounted package – 28 leads AS2524B T SOIC28 Plastic surface mounted package – 28 leads AS2524 F ni AS2523 F ca Number Dice-on-Foil DOF Dice-on-Foil DOF Dice-on-Foil Te ch AS2524B F DOF Revision 1.13 Page 18 of 19 austriamicrosystems Data Sheet AS2523, AS2524, AS2524B Copyright Copyright © 2002-2007, austriamicrosystems AG, Schloss Premstaetten, 8141 Unterpremstaetten, Austria-Europe. Trademarks Registered ®. All rights reserved. The material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. al id All products and companies mentioned are trademarks of their respective companies. Disclaimer am lc s on A te G nt st il lv Devices sold by austriamicrosystems AG are covered by the warranty and patent identification provisions appearing in its Term of Sale. austriamicrosystems AG makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described devices from patent infringement. austriamicrosystems AG reserves the right to change specifications and prices at any time and without notice. Therefore, prior to designing this product into a system, it is necessary to check with austriamicrosystems AG for current information. This product is intended for use in normal commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or life-sustaining equipment are specifically not recommended without additional processing by austriamicrosystems AG for each application. The information furnished here by austriamicrosystems AG is believed to be correct and accurate. However, austriamicrosystems AG shall not be liable to recipient or any third party for any damages, including but not limited to personal injury, property damage, loss of profits, loss of use, interruption of business or indirect, special, incidental or consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical data herein. No obligation or liability to recipient or any third party shall arise or flow out of austriamicrosystems AG rendering of technical or other services. Contact Information Headquarters: ch ni ca austriamicrosystems AG Business Unit Communications A 8141 Schloss Premstätten, Austria T. +43 (0) 3136 500 0 F. +43 (0) 3136 5692 [email protected] Te For Sales Offices, Distributors and Representatives, please visit: www.austriamicrosystems.com austriamicrosystems Revision 1.13 – a leap ahead Page 19 of 19