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ML33111 Datasheet(PDF) 10 Page - LANSDALE Semiconductor Inc. |
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ML33111 Datasheet(HTML) 10 Page - LANSDALE Semiconductor Inc. |
10 / 12 page www.lansdale.com Page 10 of 12 Issue A LANSDALE Semiconductor, Inc. ML33111 Power Supply The ML33111 requires a supply voltage between 3.0 V and 7.0 V, and a nominal current of ≈ 1.6 mA. The supply voltage should be well filtered and free of ripple. A minimum of 4.7 µF in parallel with a 0.01 µF capacitor is recommended for filtering and RF bypass. Vb is an internally generated reference set at ≈ +1.5 V, and is used internally as an AC ground. It is not available directly at any pins, but can be obtained as a buffered reference from either op amp by connecting the op amp as a follower. Typical Application Circuit Figure 18 indicates a typical implementation of the ML33111 compander. The following points apply: a) The values shown adjacent to some components are based on the expected use of the IC: —The input capacitors (Pins 3 and 14) provide a 3.0 dB rolloff of ≈ 30 Hz, a decade below the nominal voiceband. — The rectifier capacitors provide attack and decay times as indicated in the Electrical Tables. b) The values for the unlabeled components are application dependent: — The components around the op amps depend on their use. — The value of the capacitors at the compressor and expander outputs depend on the circuit to which they are connected. c) If either the compressor or expander is not used, its input must not be left open. It can be connected to ground either through a capacitor, or directly to ground. d) The two op amps can be used for any purpose which suits the application. The indicated use of the one op amp as a micro phone amplifier is only an example. e) If an op amp is not used, its output and input must be connected together. Do not leave Pin 7 or Pin 9 open. f) The logic inputs (Pins 4, 8, 12) are TTL/CMOS compatible. The logic high voltage must not exceed the VCC voltage on the ML33111. Any unused input should be connected to ground and not left open. Signal-To-Noise Improvement Among the basic reasons for the original development of compan- der type circuits was to improve the signal-to-noise ratio of long dis- tance communications circuits, and of voice circuits which are trans- mitted over RF links (CBs, walkie-talkies, cordless phones, etc.). Since much of the interfering noise heard at the receiving end of a transmission is due to noise picked up, for example, in the airway portion of the RF link, the compressor was developed to increase the low-level signals at the transmitting end. Then any noise picked up in the RF link would be a smaller percentage of the transmitted signal level. At the receiving end, the signal is then expanded back to its original level, retaining the same high signal-to-noise ratio. While the above explanation indicates it is not necessary to attenuate strong signals (at the transmitting end), a benefit of doing this is the reduced dynamic range which must be handled by the system trans- mitter and receiver. The ML33111 was designed for a two-to-one compression and expansion, i.e. a 60 dB dynamic signal is com- pressed to a 30 dB dynamic range, transmitted to the receiving end, and then expanded back to a 60 dB dynamic range. Figure 18. Typical Application ML33111 (See Text For Component Values) µP or Other Control Circuit 4.7/ 0.01 PT CM EM VCC Compressor Output Expander Output 16 1 2 15 Mute/ Passthrough Logic Bias & Reference Generator Vb 15 k Rectifier 7.5 k 40 k 40 k Vb 10 k ∆ Gain Rectifier 6 7 Vb Vb Microphone V+ 1.0 µF 1.0 µF 0.47 9 10 5 3 11 14 0.47 Compressor Input Expander Input ∆ Gain 8 4 12 20 k LEGACY APPLICATIONS INFORMATION |
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