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參數(shù)資料
| 型號(hào)： | ML2039CP |
| 元件分類(lèi)： | 數(shù)字信號(hào)處理外設(shè) |
| 英文描述： | 1-BIT, DSP-NUM CONTROLLED OSCILLATOR, PDIP8 |
| 封裝： | PLASTIC, DIP-8 |
| 文件頁(yè)數(shù)： | 5/8頁(yè) |
| 文件大?。?/td> | 152K |
| 代理商： | ML2039CP |
ML2039
5
FUNCTIONAL DESCRIPTION
The ML2039 is composed of a programmable frequency
generator, a sine wave generator, a crystal oscillator, and
a digital interface. The functional block diagram is shown
in Figure 1.
PROGRAMMABLE FREQUENCY GENERATOR
The programmable frequency generator produces a digital
output whose frequency is determined by a 16-bit digital
word. The frequency generator is composed of a phase
accumulator which is clocked at fCLK IN. The value
stored in the data latch is added to the phase accumulator
every two cycles of CLK IN. The frequency of the analog
output is equal to the rate at which the accumulator
overflows and is given by the following equation:
f
fD
D
OUT
CLKIN
DEC
=
×→
15
0
2
22
af
(1)
Where (D15–D0) is the decimal value of the
programming word.
The frequency resolution and the minimum frequency are
the same and can be calculated using:
f
MIN
CLKIN
=
2
22
(2)
When fCLK IN = 25MHz, fMIN = 5.96Hz (±2.98Hz).
Lower output frequencies are obtained by using a lower
clock frequency.
The maximum frequency output can be easily calculated
with the following equation:
f
OUT MAX
CLKIN
() =
2
6
(3)
When fCLK IN = 25MHz, fOUT(MAX) = 391kHz. Higher
frequencies (up to 500kHz) are obtained by using an
external clock, where 25MHz < fCLK IN < 32MHz.
Due to the phase quantization nature of the frequency
generator, spurious tones can be present in the output in
the range of –50dB relative to fundamental. The energy
from these tones is included in the signal to noise +
distortion specification (SND) given in the electrical
table. The frequency of these tones can be very close to
the fundamental, and it is not practical to filter them out.
SINE WAVE GENERATOR
The sine wave generator is composed of a sine lookup
table, an 8-bit DAC, an output smoothing filter, and an
amplifier. The sine lookup table is addressed by the phase
accumulator. The DAC is driven by the output of the
lookup table and generates a staircase representation of a
sine wave.
The output filter smooths the analog output by removing
the high frequency sampling components. The resultant
voltage on VOUT is a sinusoid with the second and third
harmonic distortion components at least 40dB below the
fundamental.
The analog section is designed to operate over a
frequency range of DC to 500kHz and is capable of
driving 1k
, 50pF loads at the maximum amplitude of
2.0VP-P. The sine wave output is typically centered about
a 2.5V DC level, so the output will swing from 1.5V to
3.5V. The output amplitude is accurate to within ±0.5dB
over the frequency range.
CRYSTAL OSCILLATOR
The crystal oscillator generates an accurate reference
clock for the programmable frequency generator. The
internal clock can be generated with a crystal or external
clock.
If a crystal is used, it must be placed between CLK IN and
GND. An on-chip oscillator will then generate the internal
clock. No other external components are required. The
crystal should be a parallel resonant type with a
frequency between 5MHz to 25.6MHz. It should be
placed physically as close as possible to CLK IN and
GND, to minimize trace lengths.
The crystal must have the following characteristics:
Parallel resonant type
Frequency: 5MHz to 25.6MHz
Maximum ESR: 120
@ 5 to 10MHz, 80 @10 to
15MHz, and 50
@ 15 to 25.6MHz
Drive level: 500W
Typical load capacitance: 18 - 20pF
Maximum case capacitance: 7pF
The frequency of oscillation will be a function of the
crystal parameters and board capacitance. In general,
microprocessor crystals meet the above requirements, but
it is recommended to test the selected crystal in circuit to
insure proper operation. Suitable crystals can be
purchased from the following suppliers:
ECS, Inc.
FOX Electronics
M-TRON Industries
An external clock can drive CLK IN directly if desired.
The frequency of this clock can be anything from 0 to
32MHz. However, at clock frequencies below 5MHz, the
sine wave output begins to exhibit "staircasing".
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