Low Cost, Low Power CMOS a General Purpose Analog Front End AD73311 FEATURES GENERAL DESCRIPTION 16-Bit A/D Converter The AD73311 is a complete front-end processor for general 16-Bit D/A Converter purpose applications including speech and telephony. It features Programmable Input/Output Sample Rates a 16-bit A/D conversion channel and a 16-bit D/A conversion 75 dB ADC SNR channel. Each channel provides 70 dB signal-to-noise ratio over 70 dB DAC SNR a voiceband signal bandwidth. The final channel bandwidth can 64 kS/s Maximum Sample Rate be reduced, and signal-to-noise ratio improved, by external 90 dB Crosstalk digital filtering in a DSP engine. Low Group Delay (25 s Typ per ADC Channel, The AD73311 is suitable for a variety of applications in the 50 s Typ per DAC Channel) speech and telephony area including low bit rate, high quality Programmable Input/Output Gain compression, speech enhancement, recognition and synthesis. Flexible Serial Port which Allows up to 8 Devices The low group delay characteristic of the part makes it suitable to Be Connected in Cascade for single or multichannel active control applications. Single (+2.7 V to +5.5 V) Supply Operation The gains of the A/D and D/A conversion channels are pro- 50 mW Max Power Consumption at 2.7 V grammable over 38 dB and 21 dB ranges respectively. An On-Chip Reference on-chip reference voltage is included to allow single supply 20-Lead SOIC/SSOP Package operation. A serial port (SPORT) allows easy interfacing of APPLICATIONS single or cascaded devices to industry standard DSP engines. General Purpose Analog I/O The AD73311 is available in both 20-lead SOIC and SSOP Speech Processing packages. Cordless and Personal Communications Telephony Active Control of Sound & Vibration Data Communications FUNCTIONAL BLOCK DIAGRAM AVDD1 AVDD2 DVDD SDI VINP SDIFS ANALOG 0/38dB SIGMA-DELTA DECIMATOR PGA MODULATOR SCLK VINN SERIAL SDO I/O PORT SDOFS VOUTP CONTINUOUS SWITCHED- DIGITAL 1-BIT +6/15dB SE TIME CAPACITOR SIGMA-DELTA INTERPOLATOR DAC PGA LOW-PASS FILTER LOW-PASS FILTER MODULATOR VOUTN MCLK RESET REFCAP REFERENCE AD73311 REFOUT AGND1 AGND2 DGND REV. B Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. use, nor for any infringements of patents or other rights of third parties Tel: 781/329-4700 World Wide Web Site: (AVDD = +3 V 10% DVDD = +3 V 10% DGND = AGND = 0 V, f = 16.384 MHz, MCLK 1 AD73311SPECIFICATIONS F = 64 kHz T = T to T , unless otherwise noted) S A MIN MAX AD73311A Parameter Min Typ Max Unit Test Conditions/Comments REFERENCE 5VEN = 0 REFCAP Absolute Voltage, V 1.08 1.2 1.32 V REFCAP REFCAP TC 50 ppm/C 0.1 F Capacitor Required from REFOUT REFCAP to AGND2 Typical Output Impedance 68 Absolute Voltage, V 1.08 1.2 1.32 V Unloaded REFOUT Minimum Load Resistance 1 k Maximum Load Capacitance 100 pF ADC SPECIFICATIONS 2, 3 Maximum Input Range at VIN 1.578 V p-p 5VEN = 0, Measured Differentially 2.85 dBm Nominal Reference Level at VIN 1.0954 V p-p 5VEN = 0, Measured Differentially (0 dBm0) 6.02 dBm Absolute Gain PGA = 0 dB 0.75 0.1 +1.0 dB 1.0 kHz, 0 dBm0 PGA = 38 dB 1.5 0.5 +0.5 dB 1.0 kHz, 0 dBm0 Gain Tracking Error 0.1 dB 1.0 kHz, +3 dBm0 to 50 dBm0 Signal to (Noise + Distortion) Refer to Figure 5 PGA = 0 dB 70 76 dB 300 Hz to 3.4 kHz Frequency Range 55 56 dB 0 Hz to 32 kHz Frequency Range PGA = 38 dB 61 65 dB 300 Hz to 3.4 kHz Frequency Range 53 54 dB 0 Hz to 32 kHz Frequency Range Total Harmonic Distortion PGA = 0 dB 83 70 dB PGA = 38 dB 83 70 dB Intermodulation Distortion 78 dB PGA = 0 dB Idle Channel Noise 76 dBm0 PGA = 0 dB Crosstalk 100 dB ADC Input Signal Level: 1.0 kHz, 0 dBm0 DAC Input at Idle DC Offset 20 +15 +50 mV PGA = 0 dB Power Supply Rejection 55 dB Input Signal Level at AVDD and DVDD Pins 1.0 kHz, 100 mV p-p Sine Wave 4, 5 Group Delay 25 s 64 kHz Output Sample Rate 2, 4 6 Input Resistance at VIN 25 k DMCLK = 16.384 MHz DAC SPECIFICATIONS 2 Maximum Voltage Output Swing Single Ended 1.578 V p-p 5VEN = 0, PGA = 6 dB 2.85 dBm Differential 3.156 V p-p 5VEN = 0, PGA = 6 dB 3.17 dBm Nominal Voltage Output Swing (0 dBm0) Single-Ended 1.0954 V p-p 5VEN = 0, PGA = 6 dB 6.02 dBm Differential 2.1909 V p-p 5VEN = 0, PGA = 6 dB 0 dBm Output Bias Voltage 1.08 1.2 1.32 V 5VEN = 0, REFOUT Unloaded Absolute Gain 0.75 +0.2 +1.0 dB 1.0 kHz, 0 dBm0 Gain Tracking Error 0.1 dB 1.0 kHz, +3 dBm0 to 50 dBm0 Signal to (Noise + Distortion) AVDD = +3 V 5% Refer to Figure 5 PGA = 0 dB 62.5 70 dB 300 Hz to 3.4 kHz Frequency Range 62.5 dB 0 Hz to 32 kHz Frequency Range PGA = 6 dB 62.5 71 dB 300 Hz to 3.4 kHz Frequency Range 62.5 dB 0 Hz to 32 kHz Frequency Range Total Harmonic Distortion AVDD = +3 V 5% PGA = 0 dB 70 62.5 dB PGA = 6 dB 70 62.5 dB Intermodulation Distortion 68 dB PGA = 0 dB Idle Channel Noise 82 dBm0 PGA = 0 dB Crosstalk 100 dB ADC Input Signal Level: AGND DAC Output Signal Level: 1.0 kHz, 0 dBm0 REV. 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