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 AT2008 8 Channels ADPCM Processor
Atelic Systems, Inc.
AT2008 Application Note Preliminary 8 Channels ADPCM Processor Version 1.0 January 29, 2001 Description
The AT2008 is an eight full-duplex channels ADPCM processor. It follows the G.726 ITU Standard for ADPCM compression for 40k, 32k, 24k and 16k bit rates with selectable -law and A-law input/output. This chip can operate on 16 channels of PCM to ADPCM compression, 16 channels of ADPCM to PCM decompression, 8 channels of full-duplex operation in an 8KHz frame basis, or any combination of M-channels of compression plus N-channels of decompression when M+N <= 16. Using the 3-wire command serial port, each individual half-channel can be dynamically configured to perform the ADPCM algorithm at different bit rates, idle or reset of the algorithm. It can also be programmed to set up different input/output time slots, or to select, (1) bypass without compression, (2) idle, or (3) reset of the algorithm.
Features
* * * * * * * * * 8 full channels of ITU G.726 ADPCM ADPCM coding and decoding with bypass mode Per channel selectable -Law and A-law input/output Up to 8 synchronous signals for direct interface with popular combo/codec. On-chip time slot assignment Available internal clock generator and frame sync. generator Simple 3-wire serial command port for chip configuration On-chip power-up/power down/reset The two clock pins (CLKA and CLKP) used as PCM/ADPCM data clocks, and the FSY pin used for Frame Sync signals can be programmed to become either as input pins or as output pins. (The defaults are as input pins).
Applications
* * * DECT VoIP / VoDSL Wireless PBX systems
Default Settings
3-wire serial command is required to configure the chip running ADPCM in 8 full channels.
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(c)2001 Atelic Systems, Inc.
AT2008 8 Channels ADPCM Processor
PIN Description
PIN 16 20 27 25 SYMBOL XIN XOUT YIN FSY TYPE I O I I/O
DESCRIPTION
X Channel Data In. Sampled on the falling edge of CLKP during selected time slots with MSB first. X Channel Data Out. Updated on the rising edge of CLKP during selected time slots with MSB first. Y Channel Data In. Sampled on the falling edge of CLKA during selected time slots with MSB first. Y Channel Frame Sync. Master Y Channel Frame Sync. Signal followed by the first time slot of transmission. It can be either input or output by initial setup sequence. Y Channel Data Out. Updated on the rising edge of CLKA during selected time slots with MSB first. Reset. Low active signal to force chip reset. Crystal In & Out. 14.318 MHz Crystal connected. PCM Clock. It can be either input created by external control circuit, or output generated by internal control circuit. ADPCM Clock. It can be either input created by external control circuit, or output generated by internal control circuit. Sync 1. Frame sync. for 1st CODEC. Sync 2. Frame sync. for 2nd CODEC. Sync 3. Frame sync. for 3rd CODEC. Sync 4. Frame sync. for 4th CODEC. Sync 5. Frame sync. for 5th CODEC. Sync 6. Frame sync. for 6th CODEC. Sync 7. Frame sync. for 7th CODEC. Sync 8. Frame sync. for 8th CODEC. TM1 &TM0 . Tie to Ground for normal operation. A1 & A0. Address ID key for 3-wire serial port. If match, 3-wire serial port can be enabled for configuration. Serial Data In. Data for configuration on the fly by 3-wire serial port. Sampled on the rising edge of SCLK with LSB first. Serial Data Out. Output data after sending Read Memory command by 3-wire serial port. Sampled on the rising edge of SCLK with LSB first. Serial Clock. Used to write to the 3-wire serial port registers or output data from 3-wire serial port registers. Serial Port Chip Select. Low active to enable 3-wire serial port. Power. 3.3 Volts. Ground. 0 Volt.
24 2 13 12 17 26 18 15 11 10 9 8 5 1 4 3 7 6 22
YOUT RSTZ XTAL1/MCLK XTAL2 CLKP CLKA SYNC1 SYNC2 SYNC3 SYNC4 SYNC5 SYNC6 SYNC7 SYNC8 TM1 TM0 A1 A0 SDI/SDO
O I I O I/O I/O O O O O O O O O I I I I I/O
21 23 28 14 19
SCLK SCSZ VDD Vss1 Vss2
I I -
For clock source other than 14.318MHz, please contact Atelic Systems.
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(c)2001 Atelic Systems, Inc.
AT2008 8 Channels ADPCM Processor
AT2008 PIN Assignment
AT2008 SOP Pin Assignment
28-PIN SOP
SYNC8 RSTZ TM0 TM1 SYNC7 A0 A1 SYNC6 SYNC5 SYNC4 SYNC3 XTAL2 XTAL1 VSS1
1 2 3 4 5 6 7 8 9 10 11 12 13 14
28 27 26 25 24 23 22 21 20 19 18 17 16 15
VDD YIN CKLA FSY YOUT SCSZ SDI/SDO SCLK XOUT VSS2 SYNC1 CLKP XIN SYNC2
1. 2.
When there are multiple AT2008 used on the same system, A1, A0 are used to identify the chip. A1, A0 are for chip ID. Values are from 00 to 03. They should be connected to microcontroller I/O line or hard wired to either VCC or ground.
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(c)2001 Atelic Systems, Inc.
AT2008 8 Channels ADPCM Processor
AT2008 Block Diagram
LawA
ADPCM Bypass
8-bit PCM
Law to Linear
ADPCM Encoder ADPCM Reset
M U X
M U X
ADPCM Signal
ADPCM Bypass LawA
ADPCM Reset
Encode channel
ADPCM Reset M U X ADPCM Decoder ADPCM Signal
8-bit PCM
M U X
Linear to Law
Decode channel Note: * * A dotted line with arrow mark indicate the control bit in the per channel control command, such as LawA, ADPCM bypass and ADPCM reset. Please refer to page 9 for detail information. Only two half channel is shown above. AT2008 has additional capability to process up to 16 half channels simultaneously.
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(c)2001 Atelic Systems, Inc.
AT2008 8 Channels ADPCM Processor
Power
The AT2008 is powered by a 3.3 V source and draws 100 mA at full operation and < 1 mA in powerdown mode.
Initialization
There are two different classes of resets available on the AT2008 chip. For the default reset, hold the RSTZ pin low for 50 ms. This reset will bring the chip to a functioning default state. In the default state, the following parameters are set: 1. Pins FSY, CLKP, CLKA default to input (chip will receive these signals from external source) 2. 4 half channels of 32k -law ADPCM decoder running on half channels 0-3 3. 4 half channels of 32k -law ADPCM encoder running on half channels 4-7 A second type of reset involving the use of the 3-wire serial interface can also be used direct the pin I/O configurations of FSY, CLKP, and CLKA during reset.
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(c)2001 Atelic Systems, Inc.
AT2008 8 Channels ADPCM Processor
Chip ID Setup
The two Chip ID pins A0 and A1 (Pins 6,7) should also be set during chip initialization. The "Chip ID" is used to differentiate between AT2008 chips in a system that uses more than one AT2008 chip. When using only one chip, it is recommended to tie A0 and A1 to digital zero. Thus, when programming the AT2008 chip, you can use the Chip ID = `00' to substitute wherever you see A1, A0. The maximum number of AT2008 can be used in a system is 4, and a chip ID must be assigned to each AT2008 in a system. The format of A0 and A1 should be specified according to the following table: A1 0 0 1 1 A0 0 1 0 1 Description AT2008 chip ID=0 AT2008 chip ID=1 AT2008 chip ID=2 AT2008 chip ID=3
Programming the AT2008 Using the Serial Port to Input Commands
Commands for the AT2008 are entered using the 3-wire Serial Interface. The "three wires" refer to the three pins which control the interface: SDI/SDO (Serial Data In/Serial Data Out), SCLK (Serial Clock), and SCSZ (Serial Chip Select). When SCSZ is enabled (low), the SDI is sampled every SCLK signal. Sampled bits are collected into an 8-bit register and read by the DSP. The SCSZ signal can be held more than 8-bits at a time in 8-bit multiples forming a COMMAND SEQUENCE. Different command sequences form the bulk of AT2008 programming.
Generic 3-byte Command Sequence
Byte 1 Byte 2 Byte 3
SDI
LSB
B1
B2
B3
B4
B5
B6
B7
SCLK
SCSZ
Command Sequence Overview
The AT2008 understands four different types of command sequences. 1. The PLL command sequences sets the operating speed of the chip. 2. The MCU7byte command sequence set the ADPCM algorithms, bit-slots, bit-rate and encode or decode channel. 3. The Per Channel Control command sequence sets the ADPCM bypass, reset and Law format. 4. Chip Power-up and Power-down commands.
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(c)2001 Atelic Systems, Inc.
AT2008 8 Channels ADPCM Processor
PLL Command Sequence
The PLL Command Sequence is a 3-byte command sequence that sets the operating speed of the AT2008 to be a multiple of the input crystal Mhz.
Format of PLL Command Sequence 1 F3 F2 F1 F0 A1 A0 Byte 1 0 Byte 2 N6 N5 N4 N3 N2 N1 N0 M5 Byte 3 M4 M3 M2 M1 M0 P2 P1 P0
A[1:0] refers to the chip ID (please refer to section talking about chip ID) N[6:0] = n, binary number used for frequency multiplier M[5:0] = m, binary number used for frequency divider P[2:0] = table specialized frequency divider (please refer to table). F[3:0] = Divider for CLKP & CLKA Generator. f(CLKA/CLKP) = f(XTAL) / F[3:0]
Table for P, frequency multiplier
P=0 P=1 P=2 P=3 P=4 P=5 P=6 P=7 Bypass, PLLclk = XTALclk regardless of N, M. 16 8 4 2 1 No PLLclk, PLLclk = 0 Hz (chip disabled!) No PLLclk, PLLclk = 0 Hz (chip disabled!)
The system clock uses N, M, and P to determine the speed of the system clock using the following formula: System Clock = (Crystal_clk * N * 4) / (M * P) By default, the chip is set to run at 86 Mhz using a 14.3 Mhz crystal input.
MCU7byte Command Sequence
This command sequence allows the user to specify the ADPCM algorithm, I/O bit-slots. The command sequence length is variable, and is dependent on the number of channels that are specified. The command sequence consists of a header byte, a data portion consisting of 7 bytes for every channel specified, and a footer byte. The total number of bytes in the command sequence will be 2+7N where N = number of half channels specified. The channels should be sorted by the user in increasing order of `Input Begin Bit'. All the YIN channels should be placed in sorted order before all the XIN channels. Below is a sample of MCU7byte command sequence for two `half channels'.
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(c)2001 Atelic Systems, Inc.
AT2008 8 Channels ADPCM Processor
Command Byte [7:0] Description 0 0 0 A1 A0 Chip Setup Command Header with A1, A0 chip ID ADPCM_ind 0 0 0 0 Specify channel In/Out source and ADPCM indicator. 1 11 Rate ADPCM, configuration command for Channel #0 0 00 0 0 System reserved Input Begin Bit These commands specify the begin and ending bits of input data and output data for channel #0 Input End Bit Output Begin Bit Output End Bit In/Out 0 ADPCM_ind 0 0 0 0 Specify channel In/Out source and ADPCM indicator 0 Dec 0 1 11 Rate ADPCM, configuration command for Channel #1 0 0 0 0 00 0 0 System reserved Input Begin Bit These commands specify the begin and ending bits of input data and output data for channel #1 Input End Bit Output Begin Bit Output End Bit 1 1 1 1 11 1 1 Footer of Chip Setup. Note: The format of data fields In/Out, ADPCM_ind, Dec and Rate are specified below. In/Out 00 01 10 11 Default: Chan 1 Data Chan 0 Data 0 0 In/Out 0 Dec 0 0 0 0 0 0 Description Input on Xin, Output on Xout Input on Xin, Output on Yout Input on Yin, Output on Xout Input on Yin, Output on Yout Input is on Xin, Output is on Xout for ADPCM encoding functions. Input is on Yin, Output is on Yout for ADPCM decoding functions.
Description No resource is allocated for ADPCM operation 1 Allocate resource for ADPCM operation Default: 1, allocate resource for ADPCM operation Dec 0 1 Description ADPCM (Input is PCM, Output is ADPCM) encode channel ADPCM (Input is ADPCM, Output is PCM) decode channel
ADPCM_ind 0
Default: 1 for channel 0, 1, 2, 3; 0 for channel 4, 5, 6, 7. Rate Description 0 0 16k ADPCM bitrate 0 1 24k ADPCM bitrate 1 0 32k ADPCM bitrate 1 1 40k ADPCM bitrate Default: 10 for 32k ADPCM bit-rate
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(c)2001 Atelic Systems, Inc.
AT2008 8 Channels ADPCM Processor
Per Channel Control Command Sequence
The Per Channel Control command sequence allows the user to specify some parameters for each half channel. The command sequence length is variable, and is dependent on the number of channels that are specified. The format of the command consists of a header, a begin channel number byte, and a data portion containing information of each channel. The total number of bytes in the command sequence will be 2+2N where N = number of half channels specified. Below is a sample of Per Channel Control command sequence for two half channels. Command Byte [7:0] 1 0 0 Channel Configuration Begin 0 0 0 ADPCM Reset 0 ADPCM Bypass 0 LawA 0 Description Per Channel Control command Header with A1, A0 chip ID To begin on first channel, set to 0 Configuration for channel 0
0 High Byte Ch0 Low Byte High Byte Ch1 Low Byte 0 0 0 0
0 0 0 0 0
1 0 0 0 0
A1 0 0 0
A0 0 Idle 0
Configuration for channel 1
ADPCM ADPCM LawA 0 Idle Reset Bypass Note: The format of each data fields like ADPCM reset, ADPCM bypass, lawA, lawP and idle are specified below.
ADPCM Description reset 0 Normal operation without reset of ADPCM 1 Reset ADPCM internal states Default: 1 When ADPCM reset bit is `1', ADPCM encoder will output "ff", ADPCM decoder will output "ff" for u-law and "d5 " for A-law. ADPCM Description bypass 0 Normal operation with ADPCM 1 Bypass ADPCM Default: 0
LawA Description 0 u-law 1 A-law Default: 0
Description Normal operation The output is tri-state during its time slot. Once this bit is cleared, it will come back to normal operation Default: 0
Idle 0 1
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(c)2001 Atelic Systems, Inc.
AT2008 8 Channels ADPCM Processor
Chip Power-up Power-down command
The chip power-up / power-down command is a single command byte which enables and disables the AT2008 chip. Power-up chip mode will: 1. Stop the sample processing 2. Power-up the PLL to the specified multiplier frequency 3. Reset algorithms on the chip. Power-down chip mode will: 1. Stop the sample processing. 2. Switch the system clock to the power down clock running approximately at 125 Hz.
0
0
0
1
0
0
A1
A0
Power-up Chip Command
0 0 0 0 1 0 A1 A0 Power-down Chip Command Note: A1, A0 refers to the chip ID.
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(c)2001 Atelic Systems, Inc.
AT2008 8 Channels ADPCM Processor
Reference Designs and Additional Notes Using the AT2008 with other combo chips
AT2008 DX DR Combo 0
XIN(16) FSY(25) SYNC.1(18) YOUT(24) CLKP(17)
Combo 1
SYNC2(15)
(20)XOUT
CLKA
(27)YIN
Combo 2
SYNC3(11) TM1
TM0
Combo 3
SYNC4(10)
SDI
SCLK
SCSZ
Note: SDI, SCLK, SCSZ are for 3-wire commands and should be connected to microcontroller I/O pins. CLKA and FSY. Typical application of default setting uses National single channel Combo (Quad Combo can be used to replace the 4 single Combo) When there are multiple AT2008 used on the same systems, A1, A0 are used to identify the chip. A1, A0 are for chip ID. Values are from 00-03. They should be connected to microcontroller I/O lines or wired to either VCC or ground.
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(c)2001 Atelic Systems, Inc.
AT2008 8 Channels ADPCM Processor
Sample Command Sequences: ADPCM 32k, -Law, 8-half channels:
For convenience, each half duplex channel is assigned a number corresponding to the internal processing order of the channels. Channels 0 through Channel 3 correspond with ADPCM decode channels and Channels 4 through Channel 7 corresponds with ADPCM encode channels. The following is brief description of what each half duplex channel is running: Channel 0: (decode ADPCM channel) MCU7byte Command: * * * * Channel 1: (decode ADPCM channel) MCU7byte Command: * * * * Channel 2: (decode ADPCM channel) MCU7byte Command: * * * * Channel 3: (decode ADPCM channel) MCU7byte Command: * * * * Channel 4: (encode ADPCM channel) MCU7byte Command: * * * * Channel 5: (encode ADPCM channel) MCU7byte Command: * * * * Channel 6: (encode ADPCM channel) MCU7byte Command: *
Decode (i.e. input is ADPCM sample sequence) u-Law output, 32k ADPCM algorithm. Input time slot: @yin[0:3] (beginning bit=0, ending bit=3) Output time slot: @yout[0:7] (beginning bit=0, ending bit=7)
Decode u-Law output, 32k ADPCM algorithm. Input time slot: @yin[16:19] Output time slot: @yout[16:23]
Decode u-Law output, 32k ADPCM algorithm. Input time slot: @yin[32:35] Output time slot: @yout[32:39]
Decode u-Law output, 32k ADPCM algorithm. Input time slot: @yin[48:51] Output time slot: @yout[48:55]
Encode (i.e. output is ADPCM sample sequence) u-Law input, 32k ADPCM algorithm. Input time slot: @xin[0:7] Output time slot: @xout[0:3]
Encode (i.e. output is ADPCM sample sequence) u-Law input, 32k ADPCM algorithm. Input time slot: @xin[16:23] Output time slot: @xout[16:19]
Encode (i.e. output is ADPCM sample sequence)
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(c)2001 Atelic Systems, Inc.
AT2008 8 Channels ADPCM Processor
* * * Channel 7: (encode ADPCM channel) MCU7byte Command: * * * * u-Law input, 32k ADPCM algorithm. Input time slot: @xin[32:39] Output time slot: @xout[32:35]
Encode (i.e. output is ADPCM sample sequence) u-Law input, 32k ADPCM algorithm. Input time slot: @xin[48:55] Output time slot: @xout[48:51]
The following is command sequences of per channel control and mcu7byte: Command bytes specifying per channel control 30 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 // Begin per channel control. This byte is fixed. // begin at 0 channel. This byte is usually fixed (usually begin specifying at 0). // 0 channel high byte. // 0 channel low byte. // 1 channel high byte. // 1 channel low byte. // 2 channel high byte. // 2 channel low byte. // 3 channel high byte. // 3 channel low byte. // 4 channel high byte. // 4 channel low byte. // 5 channel high byte. // 5 channel low byte. // 6 channel high byte. // 6 channel low byte. // 7 channel high byte. // 7 channel low byte.
Command bytes specifying mcu7byte definition. 00 D0 5E 00 00 03 00 07 D0 5E 00 10 13 10 17 D0 // begin mcu7byte definition. // [7]: input; [6]:output; 0==X; 1==Y, channel 0, yin-yout // Algorithm Setup, default value = 5EH for expand // // Begin input slot bit, ADPCM // End input slot bit, ADPCM // Begin output slot bit, PCM // End output slot bit, PCM // [7]: input; [6]:output; 0==X; 1==Y, channel 1, yin-yout // Algorithm Setup, default value = 5EH for expand // // Begin input slot bit, ADPCM // End input slot bit, ADPCM // Begin output slot bit, PCM // End output slot bit, PCM // [7]: input; [6]:output; 0==X; 1==Y, channel 2, yin-yout
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(c)2001 Atelic Systems, Inc.
AT2008 8 Channels ADPCM Processor
5E 00 20 23 20 27 D0 5E 00 30 33 30 37 10 1E 00 00 07 00 03 10 1E 00 10 17 10 13 32 1E 00 20 27 20 23 10 1E 00 30 37 30 33 FF // Algorithm Setup, default value = 5EH for expand // // Begin input slot bit, ADPCM // End input slot bit, ADPCM // Begin output slot bit, PCM // End output slot bit, PCM // [7]: input; [6]:output; 0==X; 1==Y, channel 3, yin-yout // Algorithm Setup, default value = 5EH for expand // // Begin input slot bit, ADPCM // End input slot bit, ADPCM // Begin output slot bit, PCM // End output slot bit, PCM // [7]: input; [6]:output; 0==X; 1==Y, channel 4, xin-xout // Algorithm Setup, default value = 1EH for compress // // Begin input slot bit, PCM // End input slot bit, PCM // Begin output slot bit, ADPCM // End output slot bit, ADPCM // [7]: input; [6]:output; 0==X; 1==Y, channel 5, xin-xout // Algorithm Setup, default value = 1EH for compress // // Begin input slot bit, PCM // End input slot bit, PCM // Begin output slot bit, ADPCM // End output slot bit, ADPCM // [7]: input; [6]:output; 0==X; 1==Y, channel 6, xin-xout // Algorithm Setup, default value = 1EH for compress // // Begin input slot bit, PCM // End input slot bit, PCM // Begin output slot bit, ADPCM // End output slot bit, ADPCM // [7]: input; [6]:output; 0==X; 1==Y, channel 7, xin-xout // Algorithm Setup, default value = 1EH for compress // // Begin input slot bit, PCM // End input slot bit, PCM // Begin output slot bit, ADPCM // End output slot bit, ADPCM // End of mcu7byte commands
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(c)2001 Atelic Systems, Inc.
AT2008 8 Channels ADPCM Processor
Electrical Characteristics:
(0C to 70C) DC Electrical Characteristics (VDD =3.3V+20%-10%) Parame ter Symbol Minimum Typical Maximum Units Notes Active Supply Current Ivcc 40 mA 1,2 Power down IVCCPD mA 3 <1 Input Leakage II -1.0 +1.0 A Output Leakage IO -1.0 +1.0 4 A Output Current (2.4V) IOH 1.2 mA Output Current (0.4 v) IOL 4 mA Notes: 1. CLKP = CLKA = 2.048MHz; MCLK = 10MHz. 2. Outputs open; inputs swinging full supply levels; 8 channel full duplex operation. 3. Power down; Xtal = high; fsx, fsy, CLKA, CLKP all 0. 4. Xout and Yout are 3-stated.
PCM Interface AC Electrical Characteristics Parameter Symbol Minimum Typical Maximum Units CLKP, CLKA Period tPXY 244 3906 ns CLKP, CLKA Pulse Width tWXYL 100 ns tWXYH CLKP, CLKA Rise Fall tRXY 10 20 ns Times tFXY Hold Time from CLKP, tHOLD 0 ns CLKA to FSY Setup Time from FSY high tSF 50 ns to CLKP, CLKA low Setup Time for Xin, Yin to tSD 50 ns CLKP, CLKA low Hold Time from Xin, Yin to tHD 50 ns CLKP, CLKA low Delay Time from CLKP, tDXYO 10 150 ns CLKA to Valid Xout, Yout Notes: 1. Maximum width of FSY is CLKP/CLKA period (except for signaling frame). 2. Measured at VIH = 2.0V, VIL = 0.8V, and 10ns maximum rise and fall times. 3. Load = 150 pF + 2LSTTL loads. 4. For LSB of PCM or ADPCM byte.
(0C to 70C) (VDD =3.3V+20%-10%) Notes 1
2 2 2 2 3
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(c)2001 Atelic Systems, Inc.
AT2008 8 Channels ADPCM Processor
Master Clock/Reset AC Electrical Characteristics Parameter Symbol Minimum MCLK tP M 69.84 Period MCLK tRM, tFM Rise/Fall Times RSTZ tRST 1 Pulse Width Note: 1. MCLK = 14MHz or 10MHz. (0C to 70C) (VDD =3.3V+20%-10%) Notes 1
Typical 100
Maximum 125 10
Units ns ns ms
Serial Port AC Electrical Characteristics Parameter Symbol Minimum Typical Maximum SDI to SCLK Set Up tDC 55 SCLK Period tP 1 SCLK to SDI Hold tCDH 55 SCLK Low Time tCL 250 500 SCLK High Time tCH 250 500 SCLK Rise and Fall Time tR, tF 100 SCSZ to SCLK Setup tCC 50 SCLK to SCSZ Hold tCCH 250 SCSZ Inactive Time tCWH 250 SCLK Setup to SCSZ tSCC 50 Falling Note: 1. Measured at VIH = 2.0V, VIL = 0.8V, and 10ns maximum rise and fall time.
(0C to 70C) (VDD =3.3V+20%-10%) Units Notes ns 1 1 s ns 1 ns 1 ns 1 ns 1 ns 1 ns 1 ns 1 ns 1
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(c)2001 Atelic Systems, Inc.
AT2008 8 Channels ADPCM Processor
Timing Diagrams
Master Clock/Reset AC Timing Diagram
tRM
tFM tWMH
tPM
tWML
MCLK
RST
tRST
3 Wire Timing Diagram
SCLK tSCC SCLK tCC tCH tR tCWH tF tCCH
tCWH
tCL tP tDC SDI
tCDH Note: SCLK may be either high or low when SCSZ is taken low.
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(c)2001 Atelic Systems, Inc.
AT2008 8 Channels ADPCM Processor
PCM Interface AC Timing Diagram
tPXY tHOLD CLKP CLKA tRXY tFXY tWXYH tWXYL
FSY
tHF tSF tHF tSD (MSB) tHD
FSY XIN YIN
XOUT YOUT
3-STATE
(MSB) tDXYO tDXYZ
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(c)2001 Atelic Systems, Inc.
AT2008 8 Channels ADPCM Processor
Package Information
28 Pin SOP AT2008 Package Information
D
A C
B
G
E
eB F
A B C D E eB F G Min 2.286 0.305 0.991 17.856 7.442 10.312 0.635 1.194 Normal 2.337 0.406 1.041 17.907 7.493 10.414 -1.27 Max 2.388 0.508 1.092 17.958 7.544 10.516 -1.346
Dimension in mm.
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(c)2001 Atelic Systems, Inc.


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