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PDF ML2035CP Data sheet ( Hoja de datos )
| Número de pieza | ML2035CP | |
| Descripción | Serial Input Programmable Sine Wave Generator | |
| Fabricantes | Micro Linear | |
| Logotipo |  |
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February 1997
ML2035
Serial Input Programmable Sine Wave Generator
GENERAL DESCRIPTION
The ML2035 is a monolithic sinewave generator whose
output is programmable from DC to 25kHz. No external
components are required. The frequency of the sinewave
output is derived from either an external crystal or clock
input, providing a stable and accurate frequency
reference. The frequency is programmed by a 16-bit serial
data word. The ML2035 has a VOUT amplitude of ±VCC/2.
The ML2035 is intended for telecommunications and
modem applications that need low cost and accurate
generation of precise test tones, call progress tones, and
signaling tones.
FEATURES
s Programmable output frequency - DC to 25kHz
s Low gain error and total harmonic distortion
s 3-wire SPI compatible serial microprocessor interface
with double buffered data latch
s Fully integrated solution - no external components
required
s Frequency resolution of 1.5Hz (±0.75Hz) with a
12MHz clock input
s Onboard 3 to 12MHz crystal oscillator
s Synchronous or asynchronous data loading capability
s Compatible with ML2031 and ML2032 tone detectors
and ML2004 logarithmic gain/attenuator
BLOCK DIAGRAM
5kΩ
CLK IN
8
CRYSTAL
OSCILLATOR
LATI
4
÷4
8-BIT
DAC
8
PHASE
ACCUMULATOR
& 512 POINT
SINE LOOK-UP
TABLE
16
16-BIT DATA LATCH
SCK
2
SID
3
16
16-BIT SHIFT REGISTER
SMOOTHING
FILTER
5kΩ
-
+
VOUT
6
ZERO
DETECT
VCC
5
GND
7
VSS
1
1
1 page  
FUNCTIONAL DESCRIPTION
The ML2035 is composed of a programmable frequency
generator, a sine wave generator, a crystal oscillator, and a
serial digital interface. The ML2035 frequency and sine
wave generator functional block diagram is shown in
Figure 3.
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/4. The value
stored in the data latch is added to the phase accumulator
every 4 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 equation:
fOUT
=
fCLKIN
× (D15 - D0)DEC
223
(1)
The frequency resolution and the minimum frequency are
the same and is given by the following equation:
∆fMIN
=
fCLKIN
223
(2)
When fCLK IN = 12.352MHz, DfMIN = 1.5Hz (±0.75Hz).
Lower frequencies are obtained by using a lower input
clock frequency.
Due to the phase quantization nature of the frequency
generator, spurious tones can be present in the output
range of –55dB relative to fundamental. The energy from
these tones is included in the signal to noise + distortion
specification. The frequency of these tones can be very
close to the fundamental. Therefore, it is not practical to
filter them out.
SINEWAVE GENERATOR
The sinewave generator is composed of a sine look-up
table, a DAC, and an output smoothing filter. The sine
look-up table is addressed by the phase accumulator. The
DAC is driven by the output of the look-up table and
generates a staircase representation of a sine wave.
The output filter smoothes 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 45dB below the
fundamental.
The ML2035 provides a peak sinewave voltage of ±VCC/2,
referenced to GND.
The analog section is designed to operate over a range
from DC to 25kHz. Due to slew rate limitations, the peak-
to-peak output voltage must be limited to VOUT(P-P) £
(125kV x Hz)/fOUT. Since the ML2035 peak-to-peak output
voltage is equal to VCC, the maximum output frequency
ML2035
must be limited to 25kHz for VCC = 5V. VOUT can drive a
1kW, 100pF loads, provided the slew rate limitations
mentioned above are not exceeded.
The output offset voltage, VOS, is a function of the peak-to-
peak output voltage and is specified as:
For example, if VOUT(P-P) = 2.5V:
(3)
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 of the ML2035. An on-chip crystal oscillator will
then generate the internal clock. No other external
capacitors or components are required. The crystal should
be a parallel-resonant type with a frequency between
3MHz to 12.4MHz. It should be placed physically as close
as possible to the CLK IN and GND.
An external clock can drive CLK IN directly if desired. The
frequency of this clock can be anywhere between 0 and
12MHz.
The crystal must have the following characteristics:
1. Parallel resonant type
2. Frequency: 3MHz to 12.4MHz
3. Maximum equivalent series resistance of 15W at a drive
levels of 1µW to 200µW, and 30W at drive levels of
10nW to 1µW
4. Typical load capacitance: 18pF
5. Maximum case capacitance: 7pF
The frequency of oscillation will be a function of the
crystal parameters and PC board capacitance. Crystals that
meet these requirements at 12.352000MHz are M-tron
3709-010 12.352 for 0ºC to 70ºC and 3709-020 12.352
for -40ºC to 85ºC operation.
5
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| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet ML2035CP.PDF ] | |
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