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 V
OUT
amplitude of ±V
CC
/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
s
s
Programmable output frequency - DC to 25kHz
Low gain error and total harmonic distortion
3-wire SPI compatible serial microprocessor interface
with double buffered data latch
Fully integrated solution - no external components
required
Frequency resolution of 1.5Hz (±0.75Hz) with a
12MHz clock input
Onboard 3 to 12MHz crystal oscillator
Synchronous or asynchronous data loading capability
Compatible with ML2031 and ML2032 tone detectors
and ML2004 logarithmic gain/attenuator
s
s
s
s
s
BLOCK DIAGRAM
5kΩ
5kΩ
CLK IN
8
-
VOUT
CRYSTAL
OSCILLATOR
8-BIT
DAC
8
PHASE
ACCUMULATOR
& 512 POINT
SINE LOOK-UP
TABLE
16
16-BIT DATA LATCH
SMOOTHING
FILTER
6
+
VCC
5
÷4
ZERO
DETECT
GND
7
LATI
4
VSS
SCK
2
16
16-BIT SHIFT REGISTER
1
SID
3
1
MICRO-LINEAR [ MICRO LINEAR CORPORATION ]
