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MC112061P bảng dữ liệu(PDF) 6 Page - LANSDALE Semiconductor Inc.

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Giải thích chi tiết về linh kiện  Crystal Oscillator
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MC112061P bảng dữ liệu(HTML) 6 Page - LANSDALE Semiconductor Inc.

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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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