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ZL49021DAA1 Datasheet(PDF) 1 Page - Zarlink Semiconductor Inc |
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ZL49021DAA1 Datasheet(HTML) 1 Page - Zarlink Semiconductor Inc |
1 / 15 page 1 Zarlink Semiconductor Inc. Zarlink, ZL and the Zarlink Semiconductor logo are trademarks of Zarlink Semiconductor Inc. Copyright 2003-2007, Zarlink Semiconductor Inc. All Rights Reserved. Features • Wide dynamic range (50 dB) DTMF Receiver • Call progress (CP) detection via cadence indication • 4-bit synchronous serial data output • Software controlled guard time for ZL490x0 • Internal guard time circuitry for ZL490x1 • Powerdown option (ZL4901x & ZL4903x) • 3.579 MHz crystal or ceramic resonator (ZL4903x and ZL4902x) • External clock input (ZL4901x) • Guarantees non-detection of spurious tones Applications • Integrated telephone answering machine • End-to-end signalling •Fax Machines Description The ZL490xx is a family of high performance DTMF receivers which decode all 16 tone pairs into a 4-bit binary code. These devices incorporate an AGC for wide dynamic range and are suitable for end-to-end signalling. The ZL490x0 provides an early steering (ESt) logic output to indicate the detection of a DTMF signal and requires external software guard time to validate the DTMF digit. The ZL490x1, with preset internal guard times, uses a delay steering (DStD) logic output to indicate the detection of a valid DTMF digit. The 4-bit DTMF binary digit can be clocked out synchronously at the serial data (SD) output. The SD pin is multiplexed with call progress detector output. In the presence of supervisory tones, the call progress detector circuit indicates the cadence (i.e., envelope) of the tone burst. The cadence information can then be processed by an external microcontroller to identify February 2007 Ordering Information ZL49010/11DAA 8 Pin PDIP Tubes ZL49020/21DAA 8 Pin PDIP Tubes ZL49030/31DCA 18 Pin SOIC Tubes ZL49030/31DCB 18 Pin SOIC Tape & Reel ZL49030/31DDA 20 Pin SSOP Tubes ZL49030/31DDB 20 Pin SSOP Tape & Reel ZL49010/11DAA1 8 Pin PDIP* Tubes ZL49020/21DAA1 8 Pin PDIP* Tubes ZL49030/31DCE1 18 Pin SOIC* Tubes, Bake & Drypack ZL49030/31DCF1 18 Pin SOIC* Tape & Reel, Bake & Drypack ZL49030/31DDE1 20 Pin SSOP* Tubes, Bake & Drypack ZL49030/31DDF1 20 Pin SSOP* Tubes, Bake & Drypack *Pb Free Matte Tin -40 °C to +85°C ZL49010/11, ZL49020/21, ZL49030/31 Wide Dynamic Range DTMF Receiver Data Sheet Figure 1 - Functional Block Diagram VDD VSS OSC2 1. ZL49010/1 and ZL49030/1 only. 2. ZL49020/1 and ZL49030/1 only. Voltage Bias Circuit AGC Anti- alias Filter High Group Filter Low Group Filter Steering Circuit Digital Detector Algorithm Code Converter and Latch Digital Guard Time3 Parallel to Serial Converter & Latch Mux Energy Detection Oscillator and Clock Circuit To All Chip Clocks Dial Tone Filter ESt DStD ACK SD 1 2 or 3. ZL490x1 only. PWDN OSC1 (CLK) |
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