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AS3502 Datasheet(PDF) 1 Page - ams AG |
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AS3502 Datasheet(HTML) 1 Page - ams AG |
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1 / 29 page  REV. M Page 1 September 1998 AS3502 Key Features q q 13-Bit Linear Sigma Delta Codec with Filters Exceeding ETSI prETS30085 and G712 . q q Single Rail 3.0 V ~5.5 V Power Supply. q q Typical Power Dissipation of 30 mW at 3 V. q q Two Low Noise Microphone Inputs with Internal Gain Adjust (+16 / +46 dB). q q 150 Ω Push/Pull Earpiece Driver with Internal Gain Adjust (-12 / +6 dB). q q 50 Ω Loudspeaker Amplifier with up to 50 mW Output Power. q q Push/ Pull Output Driver for Tone Ringer. q q On Chip Electret Microphone Voltage Source. q q Digital Transmit Gain Setting (-38 / +10 dB). q q Digital Receive Gain Setting ( -42 / +6 dB). q q Digital Sidetone Control Function ( 0 / -48 dB). q q Programmable Call Progress Tone/ DTMF / Ring Tone Generator. q q Analogue and Digital Loopback Modes. q q 16-Bit Linear / 8-Bit A-Law Switchable Serial PCM Interface with Non Delayed and Delayed Timing Modes. q q 4-Wire Serial Control Interface. q q Packaged in SOIC-28, TQFP-64. General Description AS3502 is a high performance 13-bit linear feature Codec/Filter with 8 kHz sampling rate specifically tailored to implement all analogue frontend functions of battery powered digital terminals. It includes a programmable analogue interfaces for handset and handsfree operation with a minimum amount of external components. The Codec function of AS3502 uses Sigma-Delta ( Σ∆) modulation conversion techniques with 2nd order modulators and an over sampling rate of 128 for excellent signal to noise performance. The AS3502 exceeds all CCITT G712 recommendations and the European ETSI prETS 300085 recommendations. Digital gain setting stages for transmit and receive allow to compensate for transducer tolerances and to set up a handsfree function under software control. A programmable tone generator allows to generate DTMF/Call-Progress Tones and alert sounds required in digital terminals. All programmable functions of AS3502 are controlled by a 4-wire serial control port that easily interfaces to any popular micro controller. The interface to the digital world is accomplished by a serial PCM interface that supports 16-bit linear format or 8-bit A-Law format for both non-delayed and delayed frame synchronzation modes. Block Diagramme MIC1+ EP+ EP- SPK+ SPK- SCL SDI SDO TXD TXS SCLK RXS RXD MIC1- MIC2+ MIC2- CS PCM TX MCLK VREF POR + 16/46 dB AGX F1-F3, V1-V3 DGX TRO+ TRO- POR GND CAP AGND AVDD AVSS DVDD 30Kž - + dB -38/+10 Decimation Filter Interpolation Filter Freq. Gen. Seq. Serial Control + - VREF AAF ADC DAC DAC V2 LPF -12/+6 dB AGR + + +3dB VOICE TONE LOOP SINE SQ. BPF PCM TX Comp. S1, S2 Caden. CP, CP Rep. RP, RO SG dB 0/-48 Contr. DC Lin/A- PCM TX DGR dB -42/+6 LPF PCM RX Exp. Lin/A- + AS3502 LOOP Austria Mikro Systeme International AG 13-BIT LINEAR FEATURE CODEC WITH ANALOGUE FRONTEND |
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