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ML33111EP Datasheet(PDF) 9 Page - LANSDALE Semiconductor Inc. |
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ML33111EP Datasheet(HTML) 9 Page - LANSDALE Semiconductor Inc. |
9 / 12 page www.lansdale.com Page 9 of 12 Issue A LANSDALE Semiconductor, Inc. ML33111 Expander The expander is an noninverting amplifier with a fixed feed- back resistor and a variable gain cell in its input path as shown in Figure 16. The input signal is sampled by the precision rectifier which, in turn, supplies a DC signal (ICONTROL), representative of the AC input signal, to the variable gain cell. The reference cur- rent (IREF) is an internally generated precision current. The effective impedance of the variable gain cell varies with the ratio of the two currents, and decreases as ICONTROL increas- es, thereby providing expansion. The output is related to the input by the following equation (Vin and Vout are rms volts): The input and output are internally biased at Vb ( ≈ +1.5 V), and must therefore be capacitor coupled to external circuitry. The input impedance at Pin 14 is nominally 10.9 k Ω (±20%), and the maxi- mum functional input signal is listed in the Recommended Operating Conditions table. Bias currents required by the op amp and the variable gain cell are internally supplied. Due to clamp diodes at the input (to VCC and ground), the input signal must be maintained between the supply rails. If the input signal goes more than 0.5 V above VCC or below ground, excessive currents will flow, and distortion will show up at the output, and possibly in other parts of the circuit. The output of the rectifier is filtered by the capacitor at Pin 11, which, in conjunction with an internal 20 k resistor, provides the time constant for the attack and decay times. The attack and decay times listed in the Electrical Characteristics were determined using the test procedure defined in EIA-553. Figure 10 indicates how the times vary with the capacitor value. If the attack and decay times are decreased by using a smaller capacitor, performance at low fre- quencies will degrade. Op Amps The two op amps (at Pins 6, 7, 9, and 10) are identical and can be used for peripheral functions, such as a microphone amplifier, buffer, filter, etc. They have an open loop gain of ≈100 dB, and a bandwidth of ≈ 300 kHz. The noninverting inputs are internally biased at Vb ( ≈ +1.5 V). The inverting inputs (Pins 7, 9) require a bias current of ≈ 8.0 nA, which flows into the pin. The outputs can typically supply a maxi- mum of 3.7 mA load current (see Electrical Characteristics). NOTE: If an op amp is unused, its output MUST be tied to its input (Pin 6 to 7 and/or 9 to 10). Leaving an input open can affect other portions of the IC. Logic Inputs The three inputs (Pins 4, 8, 12) provide for muting and passthrough functions for the compressor and expander according to the following truth table: The logic section permits the compressor and expander to be muted independently. The Passthrough control affects both sec- tions simultaneously, but only if the Mute inputs are at a logic level 0. If both the Passthrough and a Mute input are asserted, the Mute will override the Passthrough. The logic controls do not affect the two uncommitted op amps in any way. Figure 17 depicts a typical logic input stage configuration, and Figure 14 indicates the typical input current. The inputs’ threshold is ≈ +1.3 V, independent of VCC. An open input is equivalent to a logic low, but good design practices dictate that inputs should never be left open. The inputs must be kept with- in the range of VCC and GND. If an input is taken more than 0.5 V above VCC or below GND excessive currents will flow, and the device’s operation will be distorted. Vout = 10 x (Vin)2 (3) In terms of dB levels, the relationship is: Vo(dB) = 2.0 x Vi(dB) (4) where 0 dB = 100 mVrms (See Figures 3 and 4). CM (Pin 4) EM (Pin 12) PT (Pin 8) Function 0 0 0 Normal Operation 1 X X Compressor Mute X 1 X Expander Mute 0 0 1 Passthrough Figure 17. Logic Input Stage 50 k 50 k VCC Pins 4, 8, 12 40 k Output 15 20 k ∆ Gain Rectifier ICONTROL Iref 11 Vb 15 k VCC 14 Input 1.0 µF Figure 16. Expander |
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