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MC112061P bảng dữ liệu(PDF) 6 Page - LANSDALE Semiconductor Inc. |
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MC112061P bảng dữ liệu(HTML) 6 Page - LANSDALE Semiconductor Inc. |
6 / 9 page www.lansdale.com Page 6 of 9 Issue A LANSDALE Semiconductor, Inc. ML12061 The ML12061 consists of three basic sections: an oscillator with AGC and two translators. Buffered complementary sine wave outputs are available from the oscillator section. The translators convert these sine wave outputs to levels compatible with MECL and/or TTL. Series mode crystals should be used with the oscillator. If it is necessary or desirable to adjust the crystal frequency, a reac- tive element can be inserted in series with the crystal — an inductor to lower the frequency or a capacitor to raise it. When such an adjustment is necessary, it is recommended that the crystal be specified slightly lower in frequency and a series trimmer capacitor be added to bring the oscillator back on fre- quency. As the oscillator frequency is changed from the natural resonance of the crystal, more and more dependence is placed on the external reactance, and temperature drift of the trim- ming components then affects overall oscillator performance. The ML12061 is designed to operate from a single supply — either +5.0 Vdc or –5.2 Vdc. Although each translator has sep- arate VCC and VEE supply pins, the circuit is NOT designed to operate from both voltage levels at the same time. The sepa- rate VEE pin from the TTL translator helps minimize transient disturbance. If neither translator is being used, all unused pins (9 thru 16) should be connected to VEE (pin 8). With the translators not powered, supply current drain is typically reduced from 42 mA to 23 mA for the ML12061. Frequency Stability Output frequency of different oscillator circuits (of a given device type number) will vary somewhat when used with a given test setup. However, the variation should be within approximately ±0.001% from unit to unit. Frequency variations with temperature (independent of the crystal, which is held at 25°C) are small — about –0.08ppm/°C for ML12061 operating at 8.0 MHz. Signal Characteristics The sine wave outputs at either pin 2 or pin 3 will typically range from 800 mVp-p (no load) to 500 mVp-p (120 ohm AC load). Approximately 500 mVp-p can be provided across 50 ohms by slightly increasing the DC current in the output buffer by the addition of an external resistor (680 ohms) from pin 2 or 3 to ground, as shown in Figure 9. Frequency drift is typi- cally less than 0.0003% when going from a high-impedance load (1 megohm, 15pF) to the 50 ohm load of Figure 9. The DC voltage level at pin 2 or 3 is nominally 3.5 Vdc with VCC = +5.0 Vdc. Harmonic distortion content in the sine wave outputs is crys- tal as well as circuit dependent. The largest harmonic (third) will usually be at least 15 dB down from the fundamental. The harmonic content is approximately load independent except that the higher harmonic levels (greater than the fifth) are increased when the MECL translator is being driven. Typically, the MECL outputs (pins 12 and 13) will drive up to five gates and the TTL output (pin10) will drive up to ten gates. Noise Characteristics Noise level evaluation of the sine wave outputs operation at or 9.0 MHz, indicates the following characteristics: 1. Noise floor (200 kHz from oscillator center frequency) is approximately –122 dB when referenced to a 1.0 Hz bandwidth. Noise floor is not sensitive to load conditions and/or translator operation. 2. Close-in noise (100 Hz from oscillator center frequency) is approximately –88 dB when referenced to a 1.0 Hz bandwidth. +5.0 V 0.1 µF 0.1 µF 0.1 µF 4 71 2 or 3 0.1 µF 65 8 680 50 * See text under signal characteristics. TA, AMBIENT TEMPERATURE (°) +10 0 –10 –20 –30 –55 –25 0 25 50 75 100 125 Figure 8. Frequency Variation Due to Temperature ML12061 VCC = +5.0 Vdc Tcrystal = 25°C ML12061 Figure 9. Driving Low Impedance Loads |
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