DS2132A - Dallas Semiconductor

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Dallas Semiconductor data books.

DS2132A/Q

Digital Answering Machine Processor

DS2132A/Q

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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

28 26

432

14 15

12 1314 15 16 1718

GND

VCC

MCLK

PCMIN

CLK

PCMOUT

TRI_IN

CDOUT

TRI_OUT

CDIN

RST

VCC

GND

GND NC

GND

CLK

VCC

PCMOUT

TRI_IN

GND

CDOUT

TRI_OUT

VCC

GND

RST

NC VCC

PCMINCLK

CDIN

GND

MCLK

GND GND

CLK

DS2132A 28-PIN DIP

600 MIL

DS2132AQ 28-PIN

PLCC

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 F AX transmission. The energy

level detector allows the microcontroller to perform call

progress detection and automatic gain control func-

tions.

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PIN DESCRIPTION Table 1

PIN SYMBOL TYPE DESCRIPTION

3,4,12,14,21,22 GND - Ground. T ie 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.

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TYPICAL DIGITAL ANSWERING SYSTEM Figure 1

-5V

Microcontroller

GA1

GA2

AIN

AOUT

DGND

AGND

PCMOUT

PCMIN

TXCLK

RXCLK

TXSYNC

RXSYNC

VSS

VDD +5V

PCMIN

PCMOUT

CLK

CDOUT

CDIN

MCLK

RST POR

TRI_OUT

TRI_IN

CLK

FS VCC

GND

+5V

DRAM Array

8051-Type

P1.1

TXD

P1.0

RXD

Note:

HD44238P is a Hitachi CODEC

CODEC/FILTER

DS2132A

To 2- to 4–wire

converter and phone line

interface

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.

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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.

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CD & PCM PORT I/O DIAGRAM Figure 3

CLK1

FS2

PCMIN

PCMOUT

CDIN

CDOUT

MSB LSB

LSB MSB

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.

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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

CDIN

CDOUT

command

status status status

command command

status

command

status status* status

command data

CDIN

CDOUT

CDIN

CDOUT

status*

command

data

command

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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 = 1 100 Hz tone not present

1 = 1 100 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.

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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.

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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)

[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)

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[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 1.231V rms

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.

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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. T o 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.

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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 CIN 5pF

Output Capacitance COUT 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 1mA 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.

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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 = 1.231V rms 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:

1. FS = 8.0 KHz + 0.1%

2. Total harmonic distortion relative to test tone signal.

3. Twist = 20 LOG (High tone/Low tone).

DS2132A/Q

041295 14/17

DATA INPUT/OUTPUT

AC ELECTRICAL CHARACTERISTICS (0°C to 70°C; VCC = 5V + 10%)

PARAMETER SYMBOL MIN TYP MAX UNITS NOTES

CLK Clock Period tP244 7813 ns 1,2

CLK Pulse Width High, Low tWH, tWL 100 ns 2

CLK Rise, Fall T imes tR, tF20 ns 2

Hold T ime from CLK to FS tHOLD 0ns 2

Setup T ime from FS high CLK low tSF 50 ns 2

Hold T ime from CLK low to FS

low tHF 100 ns 2

Setup Time from PCMIN, CDIN to

CLK low tSD 50 ns 2

Hold T ime from PCMIN, CDIN to

CLK low tHD 50 ns 2

Delay T ime from CLK to Valid

PCMOUT, CDOUT tDO 10 150 ns 2

Delay T ime 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 T imes tRM, tFM 10 ns 2

RST Pulse Width tRST 100 ms 2

NOTES:

1. MCLK = 12 to 16 MHz.

2. See Figure 9.

DS2132A/Q

041295 15/17

DATA I/O AC TIMING DIAGRAM Figure 8

tHOLD

tRtFtWH tWL

tHD

tSD

tDO

tHF

tSF

tDZ

3-STATE

CLK

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/Q

041295 16/17

DS2132A DIGITAL ANSWERING MACHINE PROCESSOR

28 15

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

DS2132A/Q

041295 17/17

DS2132AQ DIGITAL ANSWERING MACHINE PROCESSOR

CH1

D1 D D2

A1A2

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