October 1998
ML2037*
500kHz, Serial Input, Programmable
Sine Wave Generator with Digital Gain Control
GENERAL DESCRIPTION
The ML2037 is a precision programmable sine wave
generator with a frequency range of DC to 500kHz. The
device is capable of generating a wide frequency range
of low distortion sine waves with no external passive
components. The frequency of the sine wave output is
programmed by a 16-bit word that is loaded through a
serial input. The sine wave output frequency is determined
by the programmed value and the clock frequency. The
clock frequency is derived from either an external crystal
connected to the device or an external clock input to
provide a stable and accurate frequency reference.
The sine wave output of the ML2037 is filtered and has a
programmable amplitude that is digitally programmed in
0.5V steps. The maximum amplitude is 2.0V
P-P
centered
at a 2.5V level. The device functions from a single 5V
power supply and has a shutdown pin to put the device
into a low power mode that disables the output. A sync
input is provided to allow the synchronization of more
than one device in a system.
FEATURES
s
Programmable output frequency:
DC to 400kHz—using a crystal
DC to 500kHz—using an external digital clock
3-wire SPI compatible serial interface with double
buffered latch for programming the frequency
Digital gain control for programming output amplitude
SYNC input for synchronization of multiple sine waves
Shutdown pin for sleep mode
Single 5V power supply operation
s
s
s
s
s
* This Part Is End Of Life As Of August 1, 2000
BLOCK DIAGRAM
11
AVCC
9
AGND
REFERENCE
DVCC
CLK IN
8-BIT
DAC
CRYSTAL
OSCILLATOR
8
PHASE
ACCUMULATOR
512 POINT
SINE LOOK-UP
TABLE
16
16-BIT DATA LATCH
S CLK
4
S DATA IN
6
2
SYNC
16-BIT SHIFT REGISTER
16
GAIN
CONTROL &
SMOOTHING
FILTER
12
AVCC
SHDN
8
G0
14
G1
15
16
OUT
10
13
D GND
1
5
3
S ENABLE
7
D GND
CLK OUT
÷2
1
MICRO-LINEAR [ MICRO LINEAR CORPORATION ]
