Single-Chip FaxEngine Codec Integrated Analog Device (CX20415) Features The ConexantTM Single-Chip FaxEngine Integrated Analog (IA) device (CX20415) is packaged in a 32-pin TQFP package and provides the analog functionality of the modem. It serves as a voice/line codec and line interface device between the CX9450 DSP and the PSTN. The DSP communicates with the integrated analog device via a serial interface. The IA has an 8-bit register that is used to configure the device. This register may be written to or read from via the serial interface. Codec The voice/line codec is a monolithic CMOS integrated circuit operating off a regulated analog 5V 10% power supply. It consists of an A/D and D/A converter path, with digital filtering and analog signal processing circuits to realize a complete ITU G.714-compatible voice frequency linear coder/decoder. The codec is intended as a low power general purpose voice codec and line interface for applications like fax, telephony, mobile telephony, etc. A block diagram is shown in Figure 1. The diagram shows the principal functional sections of the codec and double serial interfaces to the Conexant family of DSPs. * Voice/Line Codec - Delta-sigma ADC/DAC with dynamic range >70 dB - Line input and output for 600 PSTN interface - Differential speaker driver capable of a 150 load - Single-ended line driver capable of a 350 load - Differential microphone input with internal gain and filtering - Analog and digital filtering in both directions - Input/output mode selection and control * Power Requirements - Analog power supply: 5 V - Digital power supply: 3.3 V * Package - Codec: 32-pin TQFP LineIEn Fs MICIN + Vref 3rd Order LPF MICIN - 2nd order HPF Serial Interface 2nd Order LPF MicGain[1:0] LINEIN SOUT ADCGain LineOEn LINEO 4th order LPF Decimatio n Filter ADC Fs MicEn Line Driver FsN 2FsN VOX[1:0] LineSel[1:0] SpkOEn Vref Fs DACGain Fs Fs 2FsN SPKRO + RC LPF SPKR Driver Switched Capacitor LPF Interpolation Filter DAC Serial Interface SIN SPKRO- Fs 2FsN RTLoop[1:0] Analog Controls FsN ADCGain DACGain Vref Control and Timing Logic Serial Interface Control 8 POR CTRLSIN MCLK ICLK FSYNC MODE[1:0] Figure 1. Integrated Analog Device Block Diagram Data Sheet Conexant Doc. No. 100550B March 31, 2000 Single-Chip FaxEngine Codec Integrated Analog Device (CX20415) Single-Chip FaxEngine Family Characteristics and Ordering Information Device Set Number Description Marketing Abbreviation Single-Chip FaxEngine Integrated Analog Device Full-Duplex Speakerphone DTAM Support DSFE-L400-011 9600 Single-Chip FaxEngine SCE109 CXD9450-25 20415-11 (one) No No DSFE-L400-001 9600 Single-Chip FaxEngine with DTAM SCE109-V CXD9450-24 20415-11 (one) No Yes DSFE-L400-021 9600 Single-Chip FaxEngine with DTAM and Speakerphone Support SCE109-VS CXD9450-23 20415-11 (two) Yes Yes DSFE-L410-001 14400 Single-Chip FaxEngine SCE114 CXD9450-15 20415-11 (one) No No DSFE-L410-011 14400 Single-Chip FaxEngine with DTAM SCE114-V CXD9450-14 20415-11 (one) No Yes DSFE-L410-021 14400 Single-Chip FaxEngine with DTAM and Speakerphone Support SCE114-VS CXD9450-13 20415-11 (two) Yes Yes Revision History Revision Date Comments 223DS (100550A) 08/25/99 Initial limited release of document 100550B 03/31/00 Reformat, new product name, add order info (c) 1999, 2000, Conexant Systems, Inc. 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For technical questions, contact your local Conexant sales office or field applications engineer. 2 Conexant 100550B Integrated Analog Device (CX20415) Single-Chip FaxEngine Codec Microphone Input This input provides programmable gain for a microphone signal and low pass filtering to avoid aliasing before the signal is converted into a digital format. The microphone can be connected to this device either differentially or single-ended. A programmable gain amplifier provides four selectable gain settings from 0 to 30 dB. Line Input This input provides low pass filtering to avoid aliasing before the signal is converted into a digital format. The line input is single-ended and is AC coupled into the device. The filter structure realizes a two pole LPF filter. The gain on the line input is fixed to 0 dB. The input impedance is 150K ohm minimum. Either Line input or Microphone input or both can be selected by using the LineIEn and MicEn control signals. A/D Converter The signal level out of the anti-aliasing filters can be as high as 3.2V pp. To avoid a potential overload problem, 4 dB of attenuation can be provided at the ADC input. This can be enabled using the ADC Gain control. The ADC is a second order sigma-delta type ADC which samples at a rate between 1.024 MHz and 2.048 MHz to produce a programmable baseband sample, depending on the decimation ratio programmed in the decimation filter and the clock value. An option exists to disable the HPF biquad filter and in this case the output is available at a 16 KHz sample rate. The LPF biquad filter can also be enabled or disabled. D/A Converter The incoming digital signal from the DSP is fed to a lowpass interpolation filter and then to a second order deltasigma type DAC. The DAC gain is controlled by the DACGn control signal. The DAC analog output drives a switched capacitor analog filter. The speaker driver is intended to buffer and drive the low impedance speaker load with the signal selected on its input. The microphone input, or the line input, or the transmit output signal can be selected to be the speaker output. The speaker driver is enabled by using the SpkOEn signal. The speaker driver has a very high input impedance, while the line driver has a moderate input impedance. Thus , the speaker driver does not introduce gain loss when interfaced to a nominal load. Line Output The main purpose of the line output stage is to buffer the signal and drive the low impedance line load with the signal selected on its input. The microphone input, or the line input, or the speaker output can be selected to be the output. The line driver provides a single-ended output. Since all internal signals are differential, the line driver provides differential to single-ended conversion. The load attenuation for the line driver output is controlled by the VOX [1:0] lines in steps of -6 dB. The line driver output can be tri-stated using the control signal LineOEn. Serial Interface The codec provides two serial digital interfaces for communication with the DSP. Depending upon the configuration used to communicate with the DSP, all clock signals are either provided by the DSP or by the IA. Two modes of serial interface are available: Primary and Secondary. The first mode is used with the Primary IA which utilizes the line codec and the second mode is used with the Secondary IA which utilizes the voice codec. Both modes are used in support of the speakerphone option. Mode selection is made as follows: The output of this filter is a differential 2V pp or 4V pp signal depending on DAC Gain status. It is passed to a passive continuous-time second order low pass filter which removes signal images around the switched capacitor clock frequency. IA Type Mode 1 Mode 0 Primary 0 0 Secondary 0 1 Speaker Output Hardware Interface The SPKR+ and SPKR- signals form a differential output capable of driving a 150 resistive load or a highly capacitive (100 nF) ceramic receiver via dual 75 series resistors. This output is used to drive either the PSTN or a handset earpiece. A hardware interface diagram of a typical system design using the 32-pin package is shown in Figure 2. The 32-pin codec pin assignment diagram is shown in Figure 3. 100550B The 32-pin codec signals are described in detail in Table 1. Conexant 3 Single-Chip FaxEngine Codec Integrated Analog Device (CX20415) Electrical Characteristics Package Dimensions The Integrated Analog device's absolute maximum ratings, recommended operating conditions, current and power requirements, and digital interface electrical characteristics are listed in Table 2 through Table 5, respectively. Package dimensions for the Integrated Analog device are shown in Figure 4. DSP SA1CLK FSYNC IA1CLK ICLK IACLK IA MCLK MODE 0 SR1IO CTRLSIN SR4OUT SIN SR3IN SOUT MODE 1 GPO0 POR CXD9450 LINEIN Typical External Hybrid GND LINEO Typical Microphone Circuit MICIN + MICIN - SPKRO+ Typical Speaker Circuit SPKROConnections for MODE 0 and MODE 1 pins are shown for a Line IA. NC NC ICLK NC 28 27 26 25 NC MCLK NC NC 32 31 30 29 Figure 2. Hardware Interface Diagram MODE0 MODE1 Reserved SOUT 3 4 22 21 Reserved DVDD SIN FSYNC POR AVSS 5 20 DVSS 6 7 19 18 SPKROSPKRO+ 8 17 LINEO 13 14 15 16 LINEIN MICIN+ MICINMICBIAS VREF AGND AVDD AVSS 11 12 24 23 9 1 2 10 CTRLSIN Reserved 223DS - IA Device 32-pin Figure 3. 32-Pin Integrated Analog Device - Pin Assignments 4 Conexant 100550B Integrated Analog Device (CX20415) Single-Chip FaxEngine Codec Table 1. Integrated Analog Device Signal Description - 32-pin TQFP Pin # Pin Name Type (Note 1) Description 1 CTRLSIN I Serial control data input 2 Reserved -- No connection allowed 3 Reserved -- No connection allowed 4 SOUT O Serial data output 5 SIN I Serial data input 6 FSYNC I/O Frame sync 7 POR I Reset input, active low 8 AVSS I Analog Ground 9 LINEIN I-A Analog input to line pre-amp, ADC channel. 10 MICIN+ I Positive differential analog input to microphone preamplifier 11 MICIN- I Negative differential analog input to microphone preamplifier 12 MICBIAS O 2.2 V nominal DC bias source for microphone 13 VREF O-A Analog reference voltage output. Bypass to AVSS with 0.1F capacitor 14 AGND I-A Analog ground bias output. Bypass to AVSS with 0.1F capacitor 15 AVDD I-A Analog power supply 16 AVSS I-A Analog ground 17 LINEO O-A Line driver output, DAC channel or filtered LINEIN, or filtered MICIN 18 SPKRO+ O-A Positive speaker driver output, DAC channel, or filtered LINEIN, or filtered MICIN 19 SPKRO- O-A Negative speaker driver output, DAC channel, or filtered LINEIN, or filtered MICIN 20 DVSS I Digital ground 21 DVDD I Digital power supply 22 Reserved -- No connection allowed 23 MODE1 I Serial interface mode selection 24 MODE0 I Serial interface mode selection 25 Reserved -- No connection allowed 26 ICLK I Bit clock input/output for digital serial interface 27-30 NC -- No connect 31 MCLK I Main clock input 32 NC -- No connect Note 1: I O I-A O-A 100550B Digital Digital Analog Analog Input: CMOS receiver Output: 4 mA driver Input: Analog receiver Output: Analog driver Conexant 5 Single-Chip FaxEngine Codec Integrated Analog Device (CX20415) Table 2. Absolute Maximum Ratings Parameter Symbol Limits Units Supply voltage V Analog AVDD +7.0 Digital DVDD +3.6 Digital inputs VIN -0.3 VIN < DVDD + 0.3 V Analog inputs VIN -0.3 VIN < AVDD + 0.3 V V DC input clamp current IIK 10 mA DC output clamp current IOK 10 mA Static discharge voltage (25 C) VESD 2500 V Latch-up current (25 C) ITRIG 150 mA Operating temperature range TA 0 to +70 C Storage temperature range TSTG -55 to +150 C Relative humidity HREL Up to 90% non-condensing, or a wet bulb temperature up to 35 C, whichever is less. V Note: Voltages referenced to ground (Vss). Table 3. Recommended Operating Conditions Parameter Symbol Limits Units Supply voltage V Analog AVDD 5 10% Digital DVDD 3.3 10% Ta 0 to +70 Operating ambient temperature range C Note: Voltages referenced to ground (Vss). Table 4. Current Requirements Typical Current @ 25C (mA) Mode 3.3V 5V Operating 4.6 6 mA Sleep < 0.5 10 A Table 5. Digital Interface Electrical Characteristics Parameter Symbol Test Conditions Input high voltage (Logic 1) Vih DVDD = 3.3 V Input low voltage (Logic 0) Vil DVDD = 3.3 V Min Max 2.2 Unit V 1.1 V Output high voltage (Logic 1) Voh DVDD = 3.3 V Output low voltage (Logic 0) Vol DVDD = 3.3 V 2.5 0.4 V V Input leakage current Iin DVDD = 3.3 V 10 A Notes: 1. Applies to types: I and O unless otherwise indicated. 2. All voltages referenced to ground (VSS). Currents are positive when flowing into the device. 6 Conexant 100550B Integrated Analog Device (CX20415) Single-Chip FaxEngine Codec D D1 D2 PIN 1 REF D D1 D1 D2 b e DETAIL A Dim. A A1 D1 A2 D D1 A A2 Inches Max. Min. Millimeters Max. Min. 1.6 MAX 0.0630 MAX 0.15 0.05 1.4 REF 0.0020 9.25 8.75 7.0 REF 0.3445 0.0059 0.0551 REF 0.3642 0.2756 REF D2 5.6 REF L 0.0197 0.0295 L1 0.75 0.5 1.0 REF e 0.80 BSC 0.0315 BSC 0.2205 REF 0.0394 REF b 0.30 0.40 0.0118 0.0157 c 0.19 0.13 0.10 MAX 0.0051 0.0075 Coplanarity 0.004 MAX Ref: 32-PIN TQFP (GP00-D262) c A1 L Metric values (millimeters) should be used for PCB layout. English values (inches) are converted from metric values and may include round-off errors. L1 DETAIL A PD-TQFP-32 (040395) Figure 4. Integrated Analog (IA) Device Package Dimensions - 32-Pin TQFP 100550B Conexant 7 0.0 Sales Offices Further Information literature@conexant.com (800) 854-8099 (North America) (949) 483-6996 (International) Printed in USA World Headquarters Conexant Systems, Inc. 4311 Jamboree Road Newport Beach, CA 92660-3007 Phone: (949) 483-4600 Fax 1: (949) 483-4078 Fax 2: (949) 483-4391 Europe North - England Phone: +44 1344 486444 Fax: +44 1344 486555 Europe - Israel/Greece Phone: +972 9 9524000 Fax: +972 9 9573732 Europe South - France Phone: +33 1 41 44 36 51 Fax: +33 1 41 44 36 90 Europe Mediterranean - Italy Phone: +39 02 93179911 Fax: +39 02 93179913 Americas U.S. Northwest/ Pacific Northwest - Santa Clara Phone: (408) 249-9696 Fax: (408) 249-7113 U.S. Southwest - Los Angeles Phone: (805) 376-0559 Fax: (805) 376-8180 Europe - Sweden Phone: +46 (0) 8 5091 4319 Fax: +46 (0) 8 590 041 10 Europe - Finland Phone: +358 (0) 9 85 666 435 Fax: +358 (0) 9 85 666 220 Asia - Pacific U.S. Southwest - Orange County Phone: (949) 483-9119 Fax: (949) 483-9090 Taiwan Phone: (886-2) 2-720-0282 Fax: (886-2) 2-757-6760 U.S. Southwest - San Diego Phone: (858) 713-3374 Fax: (858) 713-4001 Australia Phone: (61-2) 9869 4088 Fax: (61-2) 9869 4077 U.S. North Central - Illinois Phone: (630) 773-3454 Fax: (630) 773-3907 China - Central Phone: 86-21-6361-2515 Fax: 86-21-6361-2516 U.S. South Central - Texas Phone: (972) 733-0723 Fax: (972) 407-0639 China - South Phone: (852) 2 827-0181 Fax: (852) 2 827-6488 U.S. Northeast - Massachusetts Phone: (978) 367-3200 Fax: (978) 256-6868 China - South (Satellite) Phone: (86) 755-5182495 U.S. Southeast - North Carolina Phone: (919) 858-9110 Fax: (919) 858-8669 U.S. Southeast - Florida/ South America Phone: (727) 799-8406 Fax: (727) 799-8306 U.S. Mid-Atlantic - Pennsylvania Phone: (215) 244-6784 Fax: (215) 244-9292 Canada - Ontario Phone: (613) 271-2358 Fax: (613) 271-2359 China - North Phone: (86-10) 8529-9777 Fax: (86-10) 8529-9778 India Phone: (91-11) 692-4789 Fax: (91-11) 692-4712 Korea Phone: (82-2) 565-2880 Fax: (82-2) 565-1440 Korea (Satellite) Phone: (82-53) 745-2880 Fax: (82-53) 745-1440 Singapore Phone: (65) 737 7355 Fax: (65) 737 9077 Europe Europe Central - Germany Phone: +49 89 829-1320 Fax: +49 89 834-2734 Japan Phone: (81-3) 5371 1520 Fax: (81-3) 5371 1501 www.conexant.com