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ML145564RP 데이터시트(PDF) 1 Page - LANSDALE Semiconductor Inc. |
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ML145564RP 데이터시트(HTML) 1 Page - LANSDALE Semiconductor Inc. |
1 / 18 page www.lansdale.com ML145554 ML145557 ML145564 ML145567 PCM Codec–Filter Page 1 of 18 Issue A Legacy Device: Motorola MC145554, MC145557, MC145564, MC145567 The ML145554, ML145557, ML145564, and ML145567 are all per channel PCM Codec–Filters. These devices perform the voice digitization and recon- struction as well as the band limiting and smoothing required for PCM sys- tems. They are designed to operate in both synchronous and asynchronous applications and contain an on–chip precision voltage reference. The ML145554 (Mu–Law) and ML145557 (A–Law) are general purpose devices that are offered in 16–pin packages. The ML145564 (Mu–Law) and ML145567 (A–Law), offered in 20–pin packages, add the capability of analog loopback and push–pull power amplifiers with adjustable gain. These devices have an input operational amplifier whose output is the input to the encoder section. The encoder section immediately low–pass filters the analog signal with an active R–C filter to eliminate very–high–frequency noise from being modulated down to the pass band by the switched capacitor filter. From the active R–C filter, the analog signal is converted to a differential sig- nal. From this point, all analog signal processing is done differentially. This allows processing of an analog signal that is twice the amplitude allowed by a single–ended design, which reduces the significance of noise to both the invert- ed and non–inverted signal paths. Another advantage of this differential design is that noise injected via the power supplies is a common–mode signal that is cancelled when the inverted and non–inverted signals are recombined. This dramatically improves the power supply rejection ratio. After the differential converter, a differential switched capacitor filter band- passes the analog signal from 200 Hz to 3400 Hz before the signal is digitized- by the differential compressing A/D converter. The decoder accepts PCM data and expands it using a differential D/A con- verter. The output of the D/A is low–pass filtered at 3400 Hz and sinX/X com- pensated by a differential switched capacitor filter. The signal is then filtered by an active R–C filter to eliminate the out–of–band energy of the switched capacitor filter. These PCM Codec–Filters accept both long–frame and short–frame industry standard clock formats. They also maintain compatibility with Motorola’s fami- ly of TSACs and MC3419/MC34120 SLIC products. The ML145554/57/64/67 family of PCM Codec–Filters utilizes CMOS due to its reliable low–power performance and proven capability for complex analog/digital VLSI functions. FEATURES ML145554/57(16–Pin Package) • Fully Differential Analog Circuit Design for Lowest Noise • Performance Specified for Extended Temperature Range of – 40 to + 85°C • Transmit Band–Pass and Receive Low–Pass Filters On–Chip • Active R–C Pre–Filtering and Post–Filtering • Mu–Law Companding ML145554 • A–Law Companding ML145557 • On–Chip Precision Voltage Reference (2.5 V) • Typical Power Dissipation of 40 mW, Power Down of 1.0 mW at ±5 V ML145564/67(20–Pin Package) — All of the Features of the ML145554/57 Plus: • Mu–Law Companding ML145564 • A–Law Companding ML145567 • Push–Pull Power Drivers with External Gain Adjust • Analog Loopback P DIP 16 = EP PLASTIC DIP CASE 648 ML145554/57 16 1 20 1 P DIP 20 = RP PLASTIC DIP CASE 738 ML145564/67 SOG 16 = -5P SOG PACKAGE CASE 751G ML145554/57 SOG 20 = -6P SOG PACKAGE CASE 751D ML145564/67 16 1 20 1 CROSS REFERENCE/ORDERING INFORMATION MOTOROLA P DIP 16 MC145554P ML145554EP SO 16W MC145554DW ML145554-5P P DIP 16 MC145557P ML145557EP SO 16W MC145557DW ML145557-5P P DIP 20 MC145564P ML145564RP SO 20W MC145564DW ML145564-6P P DIP 20 MC145567P ML145567RP SO 20W MC145567DW ML145567-6P LANSDALE PACKAGE Note: Lansdale lead free (Pb) product, as it becomes available, will be identified by a part number prefix change from ML to MLE. |
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