T8502 AGERE | Alldatasheet
Document overview
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Technical content
Features
n +5 V only n Two independent channels n Pin-selectable receive gain control n Pin-selectable m -law or A-law companding n Automatic powerdown mode n Low-power, latch-up-free CMOS technology — 40 mW/channel typical operating power dissipation — 12.5 mW/channel typical standby power dissipation n Automatic master clock frequency selection — 2.048 MHz or 4.096 MHz n Independent transmit and receive frame strobes n 2.048 MHz or 4.096 MHz data rate n On-chip sample and hold, autozero, and precision voltage reference n Differential architecture for high noise immunity and power supply rejection n Meets or exceeds ITU-T G.711—G.714 require- ments and VF characteristics of D3/D4 (as per Bellcore PUB43801) n Operating temperature range: –40 C to +85 C
Description
The T8502 and T8503 devices are single-chip, two- channel, m -law/A-law PCM codecs with filters. These integrated circuits provide analog-to-digital and digital-to-analog conversion. They provide the transmit and receive filtering necessary to interface a voice telephone circuit to a time-division multiplexed system. These devices are packaged in both 20-pin SOJs and 20-pin SOGs. The T8502 differs from the T8503 in its timing mode. The T8502 operates in the delayed timing mode (digital data is valid one clock cycle after frame sync goes high), and the T8503 operates in the nondelayed timing mode (digital data valid when frame sync goes high) (see Figures 5 and 6). 5-3579.b Figure 1. Block Diagram
indicates a pull-up device is included on this lead. Table 1. Pin Descriptions Voice Frequency Transmitter Input. Output of the transmit uncommitted operational amplifier. Voice Frequency Receiver Output. capacitance as close to the device as possible. . All ground pins must be connected on the circuit board. serves as the bit clock for all PCM data transfer. connected on the circuit board. sets the gain to –3.5 dB. A pull-up device is included. coding. A pull-down device is included.
4 Lucent Technologies Inc. Data Sheet July 1998T8502 and T8503 Dual PCM Codecs with Filters Absolute Maximum Ratings Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. These are absolute stress ratings only. Functional operation of the device is not implied at these or any other conditions in excess of those given in the operational sections of this data sheet. Exposure to absolute maximum ratings for extended periods can adversely affect device reliability. Handling Precautions Although protection circuitry has been designed into this device, proper precautions should be taken to avoid exposure to electrostatic discharge (ESD) during handling and mounting. Lucent Technologies Microelectronics Group employs a human-body model (HBM) and a charged-device model (CDM) for ESD-susceptibility testing and protection design evaluation. ESD voltage thresholds are dependent on the circuit parameters used to define the model. No industry-wide standard has been adopted for CDM. However, a standard HBM (resistance = 1500 W capacitance = 100 pF) is widely used and, therefore, can be used for comparison purposes. The HBM ESD threshold presented here was obtained by using these circuit parameters:
Electrical Characteristics
Specifications apply for T A = –40 C to +85 C, V DD = 5 V 5%, MCLK = either 2.048 MHz or 4.096 MHz, and GND = 0 V, unless otherwise noted. dc Characteristics Table 2. Digital Interface
Table 3. Power Dissipation connected. Clock and frame sync levels are +5 V and 0 V. Table 4. Analog Interface
0 Standby Current IDDS MCLK present;
1 Partial Standby CurrentIDDP MCLK present;
2 Powerup Current IDD1 MCLK, FS pulses present — 16 23 mA
Unless otherwise noted, the analog input is a 0 dBm0, 1020 Hz sine wave; the input amplifier is set for unity gain. an ideal encoder. The output level is sin(x)/x-corrected. Table 5. Absolute Gain Table 6. Gain Tracking Table 7. Distortion
0.775 Vrms m-law or A-law,
1020 Hz, RL = 10 kW
Table 9. Noise Table 10. Receive Gain Relative to Gain at 1.02 kHz Table 11. Transmit Gain Relative to Gain at 1.02 kHz
4600 Hz—7600 Hz
7600 Hz—8400 Hz
8400 Hz—50 kHz
Table 12. Interchannel Crosstalk (Between Channels) RF = £ 200 kW (See Note.) Table 13. Intrachannel Crosstalk (Within Channels) RF = £ 200 kW (See Note.) the load on GSX above 10 kW , per Table 4) to minimize crosstalk.
Table 14. Clock Section (See Figures 5 and 6.) Table 15. T8502 Transmit Section (See Figure 5.)
- Timing parameter tMCLDZ is referenced to a high-impedance state.
Table 16. T8503 Transmit Section (See Figure 6.)
- Timing parameter tMCHDZ is referenced to a high-impedance state.
Table 17. T8502 and T8503 Receive Section (See Figures 5 and 6.)
Note: FSX and FSR do not need to be coincident. Figure 5. T8502 Transmit and Receive Timing Note: FSX and FSR do not need to be coincident. Figure 6. T8503 Transmit and Receive Timing
4 BIT
2 BIT
12 Lucent Technologies Inc. Data Sheet July 1998T8502 and T8503 Dual PCM Codecs with Filters
Applications
5-3584.d Figure 7. Typical T8502 and T8503/SLIC Interconnection
Lucent Technologies Inc. 13 Data Sheet July 1998 T8502 and T8503 Dual PCM Codecs with Filters Outline Diagrams 20-Pin SOJ Dimensions are in millimeters. 5-4413 (C)r4 Number of Pins (N) Maximum Length (L) Maximum Width Without Leads (B) Maximum Width Including Leads (W) Maximum Height Above Board (H) 20 12.95 7.62 8.81 3.18 N PIN #1 IDENTIFIER ZONE 0.51 MAX 0.79 MAX 0.10 SEATING PLANE
1.27 TYP
H W B L
14 Lucent Technologies Inc. Data Sheet July 1998T8502 and T8503 Dual PCM Codecs with Filters Outline Diagrams (continued) 20-Pin SOG Dimensions are in millimeters. 5-4414 (C)r.4 Number of Pins (N) Maximum Length (L) Maximum Width Without Leads (B) Maximum Width Including Leads (W) Maximum Height Above Board (H) 20 13.00 7.62 10.64 2.67 W
0.610.51 MAX
H
0.28 MAX
0.10 SEATING PLANE N L B PIN #1 IDENTIFIER ZONE
Lucent Technologies Inc. 15 Data Sheet July 1998 T8502 and T8503 Dual PCM Codecs with Filters
Ordering Information
Note: All parts are shipped in dry bag. Device Part No. Package Temperature Comcode T -8502 - - EL2-D 20-Pin SOJ –40 °C to +85 °C 108295908 T -8502 - - EL2-DT 20-Pin SOJ Tape & Reel –40 °C to +85 °C 108295916 T -8502 - - GL2-D 20-Pin SOG –40 °C to +85 °C 108295924 T -8502 - - GL2-DT 20-Pin SOG Tape & Reel –40 °C to +85 °C 108295932 T -8503 - - EL2-D 20-Pin SOJ –40 °C to +85 °C 108295940 T -8503 - - EL2-DT 20-Pin SOJ Tape & Reel –40 °C to +85 °C 108295957 T -8503 - - GL2-D 20-Pin SOG –40 °C to +85 °C 108295965 T -8503 - - GL2-DT 20-Pin SOG Tape & Reel –40 °C to +85 °C 108295973
Lucent Technologies Inc. reserves the right to make changes to the product(s) or information contained herein without notice. No liability is assumed as a result of their use or application. No rights under any patent accompany the sale of any such product(s) or information. Co pyright © 1998 Lucent Technologies Inc. All Rights Reserved July 1998 DS98-342ALC (Replaces DS97-205ALC) For additional information, contact your Microelectronics Group Account Manager or the following: INTERNE T: http://www .lucent.com/micro E-MAIL: docmaster@mic ro.lucent.com N . AMERICA: Microelectronics Group, Lucent Technologies Inc., 555 Union Boulevard, Room 30L-15P-BA, Allentown, PA 18103 1-800-372-2447, FAX 610-712-4106 (In CANADA: 1-800-553-2448, FAX 610-712-4106) ASIA PACIFIC: Microelectronics Group, Lucent Technologies Singapore Pte. Ltd., 77 Science Park Drive, #03-18 Cintech III, Singapore 118256 Tel. (65) 778 8833, FAX (65) 777 7495 CHINA: Microelectronics Group, Lucent Technologies (China) Co., Ltd., A-F2, 23/F, Zao Fong Universe Building, 1800 Zhong Shan Xi Road, Shanghai 200233 P. R. China Tel. (86) 21 6440 0468, ext. 316, FAX (86) 21 6440 0652 JAPAN: Microelectronics Group, Lucent Technologies Japan Ltd., 7-18, Higashi-Gotanda 2-chome, Shinagaw a-ku, Tokyo 141, Japan Tel. (81) 3 5421 1600, FAX (81) 3 5421 1700 EU R OPE: Data Requests: MICR OELECT R ONICS G R OUP DATALINE: Tel. (44) 1189 324 299, FAX (44) 1189 328 148 Technical Inquiries:GERMAN Y: (49) 89 95086 0 (Munich), UNITED KINGDOM: (44) 1344 865 900 (Bracknell), FRANCE : (33) 1 48 83 68 00 (Paris), SWEDEN: (46) 8 600 7070 (Stockholm), FINLAND: (358) 9 4354 2800 (Helsinki), ITALY: (39) 2 6608131 (Milan), SPAIN: (34) 1 807 1441 (Madrid)