DS2132A

DS2132A MAXIM | Alldatasheet

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Technical content

Copyright 1995 by Dallas Semiconductor Corporation. All Rights Reserved. For important information regarding patents and other intellectual property rights, please refer to Dallas Semiconductor data books. DS2132A/Q Digital Answering Machine Processor DS2132A/Q 041295 1/17

FEATURES

• Two high quality speech compression algorithms per- mit either 7 or 14 minutes of speech storage in a single

4 Mbit DRAM or ARAM

• Economical three-wire data/control/status port frees up microcontroller port pins
• Detects and generates the 12 standard DTMF tones plus the A/B/C/D tones
• Detects CCITT T.30 FAX calling tone (1100 Hz)
• Generates musical tones which allow “melodies-on- hold” or customizable prompts
• Echo cancellation for improved DTMF receiver per- formance
• Precise signal level detection capability
• Record/Playback gain control
• 28-pin DIP or PLCC (DS2132AQ) packages There is a series of Application Notes that accompany this data sheet. PIN ASSIGNMENT 2728 264325 14 15 12 13 14 15 16 17 18 PD GND GND PD VCC MCLK PCMIN CLK FS PCMOUT TRI_IN CDOUT TRI_OUT CDIN RST VCC VCC VCC VCC VCC GND GND NC GND GND FS CLK VCC FS PCMOUT TRI_IN GND GND CDOUT TRI_OUT PD VCC VCC VCC VCC VCC VCC GND RST NC VCC PCMINCLK CDIN FS GND MCLK GND GND PD CLK DS2132A 28-PIN DIP

600 MIL

DESCRIPTION

The DS2132A Digital Answering Machine Processor is a Digital Signal Processor (DSP) optimized for the com- pression/expansion of PCM coded voice to/from an ex- tremely low bit rate. The DS2132A contains two ad- vanced speech compression algorithms that offer outstanding fidelity. The Standard Record/Playback al- gorithm compresses speech to 9.8Kbps and the Ex- tended Record/Playback algorithm compresses speech to 4.9Kbps. The DS2132A is ideal for embedded applications such as digital answering machines, voice mail, voice annun- ciators, and any other device that needs to maximize speech storage in a limited memory space. A simple three wire interface to the embedded microcontroller frees up valuable controller port pins for other uses and simplifies the software needed to transfer speech data, issue commands, and receive DTMF/energy level/sta- tus information. The DS2132A detects and generates all 16 DTMF tones and can also generate a wide variety of call progress tones. In addition, the DS2132A pro- vides CCITT Rec. T.30 FAX calling tone detection which enables the answering machine to determine if the in- coming call is a voice or FAX transmission. The energy level detector allows the microcontroller to perform call progress detection and automatic gain control func- tions.

PIN SYMBOL TYPE DESCRIPTION 3,4,12,14,21,22 GND - Ground. Tie to system ground. 6,7,8,9,10,11,28 VCC - Positive Supply. Tie to system +5 volt supply. 1 PD O Power-Down Active Low. Will toggle low during Power- Down mode. 5 PD O Power-Down Active High. Will toggle high during Power- Down mode. 15 NC - No Connect. Do not connect any signal to this pin. 2 RST I Reset. When this pin is low, the internal DSP algorithm is in a reset state. On power-up, this pin should be held low for at least 100 ms after MCLK is stable. 13 MCLK I Master Processing Clock. The clock used for the internal DSP engine. Should be in the range of 12 to 16 MHz. MCLK can be asynchronous to any other clock signal on the DS2132A. The duty cycle should be 50% (±5%). 16 CDIN I Compressed Data Port Input. Serial input for com- pressed audio data or DS2132A commands. Samples on the falling edges of CLK. The compressed data is expand- ed to 8-bit PCM which is output on PCMOUT. 17,26 CLK I Clock. This clock is used to sample data at CDIN and PCMIN and output data at CDOUT and PCMOUT. CLK must be synchronous with FS. See Figure 3. 18,25 FS I Frame Sync. This input must be an 8 KHz clock with a pulse width high time of one to nine CLK cycles for proper operation. See Figure 3. 19 TRI_OUT O CDOUT Tri-state Control Out. This output should be tied to the TRI_IN pin (pin 23) for proper operation; will be low when CDOUT is active. 20 CDOUT O Compressed Data Port Output. Serial output for com- pressed audio data or status information, updated on the rising edge of CLK. 23 TRI_IN I CDOUT Tri-state Control In. This input should be tied to the TRI_OUT pin (pin 19) for proper operation. If this pin is forced high, CDOUT will not go active. 24 PCMOUT O PCM Port Output. Output for expanded data which is in the standard 8-bit µ-law format. Data is updated on the rising edges of CLK. 27 PCMIN I PCM Port Input. Input for the 8-bit serial µ-law PCM data which would normally be supplied by a codec/filter device. Data is sampled on the falling edges of CLK. FUNCTIONAL DESCRIPTION A typical digital answering machine using the DS2132A is shown in Figure 1. The system consists of a standard telephone CODEC (COder-DECoder) device, the DS2132A, a microcontroller, and a bank of DRAM. The implementation shown is with a Hitachi CODEC and a 8051-type microcontroller but a wide variety of CODECs and microcontrollers can be used with the DS2132A. It is only important that the CODEC have se- rial digital I/O and have µ-law (“Mu” law) companding. Table 2 lists some CODECs that will work with the DS2132A. There is a separate Application Note that ex- plains how to connect these CODECs to the DS2132A.

TYPICAL DIGITAL ANSWERING SYSTEM Figure 1 -5V Microcontroller GA1 GA2 AIN AOUT DGND AGND PCMOUT PCMIN TXCLK RXCLK TXSYNC RXSYNC VSS VDD +5V PD PCMIN PCMOUT CLK FS CDOUT CDIN MCLK RST POR TRI_OUT TRI_INCLK FS VCC GND +5V +5V+5V DRAM Array8051-Type P1.1 TXD P1.0 RXD Note: HD44238P is a Hitachi CODEC CODEC/FILTER DS2132ATo 2- to 4–wire converter and phone line interface PD

12 MHz to 16 MHz

RECOMMENDED DS2132A CODECS Table 2 Vendor Model(s) Texas Instruments TCM29CXX National Semiconductor TP3054X Motorola MC1455XX SGS–Thomson ETC505X Hitachi HD44238C As shown in Figure 1, the microcontroller creates the clock (CLK) and frame sync (FS) that is sent to both the CODEC and the DS2132A. In this manner, the DS2132A shares the signals necessary to drive the CO- DEC. To “record” an audio signal, the following occurs. The analog signal applied at the AIN pin of the CODEC is converted to eight bit values and output at PCMOUT every 125 µs. The DS2132A takes these eight bit sam- ples in at the PCMIN pin and effectively compresses them to either 9.8Kbps or 4.9Kbps. See Figure 2. The compressed data is then passed to the microcontroller via the CDOUT pin (CD stands for Compressed Data). The microcontroller then stores the compressed speech in the DRAM array. The inverse of this process is required to “playback” the message at the AOUT pin of the CODEC.

DS2132A BLOCK DIAGRAM Figure 2 Playback Gain Control Record Gain Control DTMF/Level/ FAX Tone Detection Speech Compression Command Processor Speech Expansion DTMF/Musical Tone Generation PCMOUT PCMIN CDOUT CDIN Loopback To CODEC “PCM” Side To Microcontroller “Compressed Data” Side Threshold OPERATION OF THE CD AND PCM PORTS As mentioned earlier, the DS2132A essentially contains two separate serial ports, one for the DS2132A to micro- controller interface (the CD Port ) and one for the CO- DEC to DS2132A interface (the PCM Port). The Com- pressed Data (CD) Port is used to send compressed speech information from the DS2132A to the microcon- troller and vice versa. The CD Port is also used to moni- tor the current status of the DS2132A and it is used to issue instructions to the DS2132A. The CD Port con- sists of the CDIN, CDOUT, CLK, and FS pins (the CLK and FS pins are shared with the CODEC). The PCM Port is used to transfer uncompressed speech data be- tween the DS2132A and the CODEC. It consists of the PCMIN, PCMOUT, CLK, and FS pins. Figure 3 details the DS2132A CD and PCM port signals. All commu- nication begins with the frame sync (FS) signal. It indi- cates to the DS2132A and the CODEC that a byte of in- formation will follow. Note that the PCM Port operates on a MSB first basis and the CD Port operates on a LSB first basis.

CD & PCM PORT I/O DIAGRAM Figure 3 CLK 1 FS 2 PCMIN PCMOUT CDIN CDOUT MSB LSB MSB LSB LSB MSB LSB MSB 3-STATE 3-STATE NOTES: 1. The CLK period must be between 128 KHz and 4.096 MHz 2. The FS pulse must be between 1 and 9 (inclusive) CLK periods long On the PCM Port, data will be transferred from the CO- DEC to the DS2132A via one path and transferred from the DS2132A to the CODEC via another path. These transfers take place every 125 µs (as determined by the FS signal). Although the CD Port also transfers data ev- ery 125 µs, it operates much differently than does the PCM Port. The CD Port constantly toggles back and forth in its data transfer direction. During one frame sync, the microcontroller will transfer either com- pressed speech data or command information to the DS2132A and during the next frame sync, the transfer direction will switch and the DS2132A will send either compressed speech data or status information to the microcontroller. Hence, the CD Port is truly bidirection- al. See Figure 4.

CD PORT FLOW STRUCTURE Figure 4 cmd. status* cmd. status* cmd. status* cmd. status cmd. status cmd. status cmd. status cmd. status cmd. status cmd. status* cmd. data cmd. status cmd. data cmd. status cmd. status cmd. status data status data status Tone Generation or Idle Recording Mode Playback Mode CD Port CD Port CD Port DS2132 Microcontroller DS2132 Microcontroller DS2132 Microcontroller NOTE: Status Bytes marked with an asterisk (*) indicate bytes with the MSB set to 1. CD PORT I/O STRUCTURE Figure 5 Tone Generation or Idle Record Mode Playback Mode FS CDIN CDOUT command status status status command command status command status status* status command data FS CDIN CDOUT FS CDIN CDOUT status* command command data command

There are three types of bytes that can be transferred on the CD Port; Command Bytes, Status Bytes, and Com- pressed Speech Data Bytes (or simply Data Bytes). The Command Bytes are always transferred from the microcontroller to the DS2132A to instruct the proces- sor to perform a particular task like transmit a tone. All of the possible commands that can be sent to the DS2132A are listed in Table 3. Status Bytes are always transferred from the DS2132A to the microcontroller. They inform the microcontroller if a DTMF digit is being received, or what the current energy level is. See Figure 6. Finally, there are Data Bytes which are transferred from the DS2132A to the microcontroller during a “re- cording” and from the microcontroller to the DS2132A during a “playback”. See Figure 5. When recording, the microcontroller must read the MSB of the Status Byte to discriminate between Data Bytes and Status Bytes. When playing back, the microcontroller must read the MSB of the Status Byte to know when to send a Com- mand Byte and when to send a Data Byte. STATUS BYTE FORMAT Figure 6 CDFA DV FCNG (MSB) (LSB) DV = 0 (see Table 4) DV = 1 (see Table 5) FAX Calling Tone Detect 0 = 1100 Hz tone not present 1 = 1100 Hz tone present DTMF Digit Valid 0 = no DTMF digit detected; received energy level reported at L0 to L4 bits 1 = DTMF digit detected; the digit is reported at D0 to D3 bits Compressed Data Frame Alert Record Mode: 0 = next CD Port output is a Status Byte 1 = next CD Port output is a Data Byte Playback Mode: 0 = next CD Port input is a Command Byte 1 = next CD Port input is a Data Byte Tone Generation or Idle: Will always be set to 0. SYNCHRONIZING THE CD PORT On power-up, the first task of the microcontroller is to “synchronize” the CD Port. It can accomplish this by lis- tening to what the DS2132A is sending it. On power-up (after the RST pin is returned high), the DS2132A will be in the Idle mode awaiting a command from the micro- controller. Hence it will be alternately sending a Status Byte to the microcontroller and taking in a Command Byte. In Figure 1, there is a pull-up resistor on the CD Port to insure that on power-up, the microcontroller will send the “no update” command to the DS2132A, which is [FF]. When the microcontroller reads a value other than [FF], then it knows that the byte it just read is a Sta- tus Byte and hence it will then know that the next byte will be a Command Byte and it will be synchronized. RECORD & PLAYBACK MODES Figure 7 shows two brief flowcharts on what actions the microcontroller would follow to instruct the DS2132A to compress (Record Mode) or expand speech (Playback Mode) data. Before a recording or a playback is to be- gin, it is recommended that the microcontroller first set the gain to a nominal position. Then, if needed, the gain can be adjusted as the recording or playback is occur- ring. For example, as the recording process begins, the microcontroller can monitor the incoming speech ener- gy levels via the Status Byte. If the incoming speech lev- el is too low or too high, the gain can be adjusted accord- ingly. The microcontroller can exit the Recording or Playback Modes by sending the Idle command.

RECORD & PLAYBACK FLOWCHARTS Figure 7 Write Command Byte to set the gain Read Status Byte Write Command Byte to begin recording Read Status Byte; does MSB = 1? Record Flowchart Playback Flowchart Write Command Byte to set the gain Read Status Byte Write Command Byte to begin playback Read Status Byte; does MSB = 1? no yesno yes Write Command Byte Read Data Byte Write Command Byte Write Command Byte Write Data ByteWrite Command Byte LOOPBACK MODE The DS2132A contains a Loopback Mode that is useful in debugging the CODEC to DS2132A interface and in adjusting the analog circuits to the proper gain/attenua- tion levels. In the Loopback Mode, the DS2132A routes the incoming digitized audio signal received at the PCMIN pin, back to the PCMOUT pin after making gain adjustments. See Figure 2. Notice that the route in- cludes the record and playback gain circuits. The Loop- back mode can be enabled at any time. When the Loop- back is enabled, the generated tones or expanded speech are ignored. See Figure 2. The DS2132A will enter the Loopback mode if a Command Byte of [08] is sent to it by the microcontroller. The Loopback mode will be exited upon receiving the Exit Loopback Mode command. FAX CALLING TONE DETECT According to CCITT Recommendation T.30, originating automatic FAX machines should transmit an 1100 Hz tone for 0.5 seconds every 3.5 seconds (on for 0.5’s; off for 3.0’s). This tone is meant as an indication to the called station that a non-voice instrument is making the call. The Status Byte in the DS2132A reports if a 1100 Hz tone is being received. This detection can be used to determine if a FAX machine has called the an- swering machine. The answering machine will then know not to record the incoming call and to route the call to a FAX machine.

COMMAND BYTE OPTIONS Table 3 [FF] No update [00] No update [BE] Idle [08] Enter Loopback mode [09] Exit Loopback mode [04] Enter Power-Down mode [05] Exit Power-Down mode [4A] Set recording path gain to +30 dB [49] Set recording path gain to +27 dB [48] Set recording path gain to +24 dB [47] Set recording path gain to +21 dB [46] Set recording path gain to +18 dB [45] Set recording path gain to +15 dB [44] Set recording path gain to +12 dB [43] Set recording path gain to +9 dB [42] Set recording path gain to +6 dB [41] Set recording path gain to +3 dB [40] Set recording path gain to 0 dB [5F] Set recording path gain to -3 dB [5E] Set recording path gain to -6 dB [5D] Set recording path gain to -9 dB [5C] Set recording path gain to -12 dB [5B] Set recording path gain to -15 dB [5A] Set recording path gain to -18 dB [59] Set recording path gain to -21 dB [58] Set recording path gain to -24 dB [57] Set recording path gain to -27 dB [56] Set recording path gain to -30 dB [80] Generate DTMF “0” (941+1336 Hz) [81] Generate DTMF “1” (697+1209 Hz) [82] Generate DTMF “2” (697+1336 Hz) [83] Generate DTMF “3” (697+1477 Hz) [84] Generate DTMF “4” (770+1209 Hz) [85] Generate DTMF “5” (770+1336 Hz) [86] Generate DTMF “6” (770+1477 Hz) [87] Generate DTMF “7” (852+1209 Hz) [90] Generate Dial tone (350+440 Hz) [91] Generate Ringing tone (480+440 Hz) [94] Generate bright musical note “A” (440+1320 Hz) [95] Generate bright musical note “B” (494+1482 Hz) [96] Generate bright musical note “C” (523+1569 Hz) [97] Generate bright musical note “D” (587+1761 Hz) [97] Generate bright musical note “D” (587+1761 Hz) [98] Generate bright musical note “E” (659+1977 Hz) [99] Generate bright musical note “F” (698+2094 Hz) [9A] Generate bright musical note “G” (784+2352 Hz) [B4] Generate musical note “A” (440 Hz) [B5] Generate musical note “B” (494 Hz) [B6] Generate musical note “C” (523 Hz) [B7] Generate musical note “D” (587 Hz) [B8] Generate musical note “E” (659 Hz) [B9] Generate musical note “F” (698 Hz) [BA] Generate musical note “G” (784 Hz) [9B] Generate bright musical note “A” one octave higher (880+2640 Hz) [9C] Generate bright musical note “B” one octave higher (988+2974 Hz) [BB] Generate musical note “A” one octave higher (880 Hz) [BC] Generate musical note “B” one octave higher (988 Hz) [25] Record at Standard rate (9.8Kbps) [27] Record at Extended rate (4.9Kbps) [28] Playback at Standard rate (9.8Kbps) or Premium Rate (16Kbps) with echo cancellation enabled [2A] Playback at Extended rate (4.9Kbps) or Intermediate Rate (8Kbps) with echo cancellation enabled [23] Record at Intermediate rate (8Kbps) [21] Record at Premium rate (16Kbps) [20] Playback at Standard rate (9.8 Kbps) or Premium rate [16Kbps] with echo cancellation disabled [22] Playback at Extended rate (4.9Kbps) or Intermediate rate (8Kbps) with echo cancellation disabled [6A] Set playback path gain to +30 dB [69] Set playback path gain to +27 dB [68] Set playback path gain to +24 dB [67] Set playback path gain to +21 dB [66] Set playback path gain to +18 dB [65] Set playback path gain to +15 dB [64] Set playback path gain to +12 dB [63] Set playback path gain to +9 dB [62] Set playback path gain to +6 dB [61] Set playback path gain to +3 dB [60] Set playback path gain to 0 dB [7F] Set playback path gain to -3 dB [7E] Set playback path gain to -6 dB [7D] Set playback path gain to -9 dB [7C] Set playback path gain to -12 dB [7B] Set playback path gain to -15 dB [7A] Set playback path gain to -18 dB [79] Set playback path gain to -21 dB [78] Set playback path gain to -24 dB [77] Set playback path gain to -27 dB [76] Set playback path gain to -30 dB [88] Generate DTMF “8” (852+1336 Hz) [89] Generate DTMF “9” (852+1477 Hz)

[8A] Generate DTMF “A” (697+1633 Hz) [8B] Generate DTMF “B” (770+1633 Hz) [8C] Generate DTMF “C” (852+1633 Hz) [8D] Generate DTMF “D” (941+1633 Hz) [8E] Generate DTMF “*” (941+1209 Hz) [8F] Generate DTMF “#” (941+1477 Hz) [92] Generate Busy tone (480+620 Hz) [93] Generate 400 Hz tone [9E] Generate 1004 Hz tone [9D] Generate 1400 Hz tone [10] Set “off” threshold to -50 dBm [11] Set “off” threshold to -49 dBm [12] Set “off” threshold to -47dBm [13] Set “off” threshold to -44 dBm [14] Set “off” threshold to -42 dBm [15] Set “off” threshold to -40 dBm [16] Set “off” threshold to -38 dBm [17] Set “off” threshold to -35 dBm [18] Set “off” threshold to -32 dBm [19] Set “off” threshold to -29 dBm [1A] Set “off” threshold to -26 dBm [1B] Set “off” threshold to -23 dBm [1C] Set “off” threshold to -20 dBm [1D] Set “off” threshold to -17 dBm [1E] Set “off” threshold to -14 dBm [1F] Set “off” threshold to -11 dBm NOTES: 1. All tones are generated at 0 dBm0 except for the high tones of DTMF which are at +3 dBm0. 2. The unit dBm0 represents a digital representation of an analog level; throughout this data sheet, the zero reference point of 0 dBm0 was measured with a Hitachi HD44238P CODEC which produces a 1.231Vrms analog signal when sent a “0 dBm0” digital code. 3. All letters and numbers contained in brackets ([ ]) represent Hexadecimal values. 4. The above hexadecimal code are sent LSB first.

DEFINITION OF THE L0 TO L4 LEVEL BITS Table 4 L4 L3 L2 L1 L0 ENERGY LEVEL RECEIVED 0 0 0 0 0 <-48dBm0 0 0 0 1 0 -45dBm0 0 0 1 0 0 -42dBm0 0 0 1 0 1 -39dBm0 0 0 1 1 0 -36dBm0 0 0 1 1 1 -33dBm0 0 1 0 0 0 -30dBm0 0 1 0 0 1 -27dBm0 0 1 0 1 0 -24dBm0 0 1 0 1 1 -21dBm0 0 1 1 0 0 -18dBm0 0 1 1 0 1 -15dBm0 0 1 1 1 0 -12dBm0 0 1 1 1 1 -9dBm0 1 0 0 0 0 -6dBm0 1 0 0 0 1 -3dBm0 1 0 0 1 0 0dBm0 1 0 0 1 1 +3dBm0 1 0 1 0 0 +6dBm0 1 0 1 0 1 +9dBm0 DEFINITION OF THE D0 TO D3 DTMF BITS Table 5 D3 D2 D1 D0 DTMF DIGIT DETECTED 0 0 0 0 DTMF Digit “0” 0 0 0 1 DTMF Digit “1” 0 0 1 0 DTMF Digit “2” 0 0 1 1 DTMF Digit “3” 0 1 0 0 DTMF Digit “4” 0 1 0 1 DTMF Digit “5” 0 1 1 0 DTMF Digit “6” 0 1 1 1 DTMF Digit “7” 1 0 0 0 DTMF Digit “8” 1 0 0 1 DTMF Digit “9” 1 0 1 0 DTMF Digit “A” 1 0 1 1 DTMF Digit “B” 1 1 0 0 DTMF Digit “C” 1 1 0 1 DTMF Digit “D” 1 1 1 0 DTMF Digit “*” 1 1 1 1 DTMF Digit “#” POWER-DOWN MODE The DS2132A can be placed into a low-power standby condition by sending the enter power-down command [04] to the DS2132A. The DS2132A will power down within 500 µs after receiving the power-down command. The MCLK signal should still be applied to the DS2132A in the power-down mode. The CLK and FS signals may be either stopped or continued. In the power-down mode, the DS2132A will consume about 1 mA and the PD pin (Pin 1) will be forced low and the PD pin (Pin 5) will be forced high. The PD and PD pins can be used to power-down the CODEC. See Figure 2. To exit the pow- er-down mode, the exit power-down command [05] should be sent to the DS2132A. There is no need to is- sue a hardware reset via the RST pin; the device will re- set itself. The DS2132A will power-up in the Idle mode. The microcontroller should wait 1 ms after issuing the exit power-down command before reinitializing the device.

ABSOLUTE MAXIMUM RATINGS* Voltage on Any Pin Relative to Ground -1.0V to +7.0V Operating Temperature 0 °C to 70°C Storage Temperature -55 °C to +125°C Soldering Temperature 260 °C for 10 seconds * This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operation sections of this specification is not implied. Exposure to absolute maxi- mum rating conditions for extended periods of time may affect reliability. RECOMMENDED DC OPERATING CONDITIONS (0°C to 70°C) PARAMETER SYMBOL MIN TYP MAX UNITS NOTES Logic 0 VIL -0.3 0.8 V Logic 1 VIH 2.0 VCC +0.3 V Supply VCC 4.5 5.5 V CAPACITANCE (tA = 25°C) PARAMETER SYMBOL MIN TYP MAX UNITS NOTES Input Capacitance C IN 5 pF Output Capacitance C OUT 10 pF DC ELECTRICAL CHARACTERISTICS (0°C to 70°C; VCC = 5V + 10%) PARAMETER SYMBOL MIN TYP MAX UNITS NOTES Active Supply Current IDDA 35 40 mA 1,2 Input Leakage ILI -1.0 +1.0 µA Output Leakage ILO -1.0 -1.0 µA 3 Output Current (2.4 V) IOH -1.0 -1.0 mA Output Current (0.4V) IOL +4.0 mA Power-Down Current IPD 1 mA 1,2,4 NOTES: 1. VCC = 5.5V; CLK=2.048 MHz; MCLK=16 MHz. 2. Outputs open; inputs swinging full supply levels. 3. PCMOUT and CDOUT are 3-stated. 4. Power-down mode.

DTMF RECEIVER CHARACTERISTICS (0°C to 70°C; VCC = 5V + 10%) PARAMETER SYMBOL MIN TYP MAX UNITS NOTES Valid Detect Amplitude Range -40 0 dBm0 1,2 Frequency Deviation Accept + 1.5 % 3 Frequency Deviation Reject +3.5 % 3 Minimum Twist Accept Range -10 +10 dB 4 Talk Off (Mitel Tape CM7291) 5 Hits 5 Noise Tolerance (Mitel Test Tape CM7291) -12 dB 6 NOTES: 1. 0 dBm0 = 1.231Vrms when sent through a Hitachi HD44238P CODEC as shown in Figure 1. 2. Individual tone level of the DTMF pair with recording path gain set to 0db. 3. Percent of nominal frequency for the individual tone; FS = 8 KHz (+ 0.1%). 4. Twist = 20 LOG (High tone/Low tone). 5. Talk Off is a measure of the speech immunity of a DTMF receiver; the lower the number of hits, the better the immunity. 6. Three KHz bandlimited white noise, referenced to lowest amplitude in the DTMF pair. DTMF DETECTION TIMING (0°C to 70°C; VCC = 5V + 10%) PARAMETER SYMBOL MIN TYP MAX UNITS NOTES Tone Duration Accept 40 ms Tone Duration Reject 20 ms Interdigit Pause Accept 40 ms Interdigit Pause Reject 20 ms DTMF TONE GENERATOR CHARACTERISTICS (0°C to 70°C; VCC = 5V + 10%) PARAMETER SYMBOL MIN TYP MAX UNITS NOTES DTMF Frequency Deviation (each tone of the pair) +1.0 % 1 Output Distortion (single tone) -25 dB 2 DTMF Tone Level Twist +3 dB 3 NOTES: 2. Total harmonic distortion relative to test tone signal. 3. Twist = 20 LOG (High tone/Low tone).

AC ELECTRICAL CHARACTERISTICS (0°C to 70°C; VCC = 5V + 10%) PARAMETER SYMBOL MIN TYP MAX UNITS NOTES CLK Clock Period tP 244 7813 ns 1,2 CLK Pulse Width High, Low tWH , tWL 100 ns 2 CLK Rise, Fall Times tR , tF 20 ns 2 Hold Time from CLK to FS tHOLD 0 ns 2 Setup Time from FS high CLK low tSF 50 ns 2 Hold Time from CLK low to FS low tHF 100 ns 2 Setup Time from PCMIN, CDIN to CLK low tSD 50 ns 2 Hold Time from PCMIN, CDIN to CLK low tHD 50 ns 2 Delay Time from CLK to Valid PCMOUT, CDOUT tDO 10 150 ns 2 Delay Time from CLK to PCMOUT, CDOUT 3-stated tDZ 20 150 ns 2 NOTES: 1. At least nine CLK clocks must be received within first half of the FS period (62.5 µs). 2. See Figure 8. MASTER CLOCK/RESET AC ELECTRICAL CHARACTERISTICS (0°C to 70°C; VCC = 5V + 10%) PARAMETER SYMBOL MIN TYP MAX UNITS NOTES MCLK Period tPM 62 84 ns 1,2 MCLK Duty Cycle 45 55 % MCLK Rise/Fall Times tRM , tFM 10 ns 2 RST Pulse Width tRST 100 ms 2 NOTES: 1. MCLK = 12 to 16 MHz. 2. See Figure 9.

DATA I/O AC TIMING DIAGRAM Figure 8 tHOLD tP tR tF tWH tWL tHDtSD tDO tHF tSF tDZ 3-STATE CLK FS PCMIN, CDIN PCMOUT CDOUT MSB for PCMIN LSB for CDIN MSB for PCMOUT LSB for CDOUT MASTER CLOCK & RESET AC TIMING DIAGRAM Figure 9 tRM tFM tPM tWMH tWML tRST RST MCLK

DS2132A DIGITAL ANSWERING MACHINE PROCESSOR A 28 15 B D H J F E C GK 13 EQUAL SPACES AT + .010 TNA INCHES DIM MIN MAX A 1.445 1.470 B 0.530 0.550 C 0.140 0.160 D 0.600 0.625 E 0.015 0.040 F 0.120 0.145 G 0.090 0.110 H 0.600 0.680 J 0.008 0.012 K 0.015 0.022

DS2132AQ DIGITAL ANSWERING MACHINE PROCESSOR CH1 N E D1 D D2 C A1A2 A B INCHES DIM MIN MAX A 0.165 0.180 A1 0.090 0.120 A2 0.020 – B 0.026 0.033 B1 0.013 0.021 C 0.009 0.012 D 0.485 0.495 D1 0.450 0.456 D2 0.390 0.430 E 0.485 0.495 E1 0.450 0.456 E2 0.390 0.430 L1 0.060 – N 28 – e1 0.050 BSC CH1 0.042 0.048