Thomas, take a look at Fairchild's (formerly Micro Linear's) ML2036
Programmable Sinewave Generator.

    While you would have to add a PGA for amplitude, the ML2036 covers
1 - 50KHz. All you need is a crystal (literally, no capacitors). It requires
+/- 5V and has a 3-wire SPI-style interface. You clock-in 16 Bits, LSB
first, and set a Latch Enable line to set the frequency from 1 to 50KHz (I
tested it to 65,535KHz). By using a 8.388608MHz crystal (Digi-Key PN: SE3415
/ Epson CA-301 family), you get a direct one-to-one program data to
frequency setting with a 1Hz resolution. The chip provides Osc/2 and Osc/8
outputs which may be of use if you want to clock a PIC at 4.194304MHz.

    There is a voltage reference input. Tying this to +5V gives a maximum
output swing of +/- 2.5Vp-p. You can reduce this via an external reference.
Harmonic distortion is -45db max. The device comes in a 14-pin DIP or 16-pin
SOIC package. For more info:

       http://www.fairchildsemi.com/pf/ML/ML2036C.html

    - Tom

At 05:31 11-06-02, Thomas wrote:
>Hello Forum,
>
>did anybody knows a chip (IC) which contains a digitally controllable
>function-generator?
>
>The needed waveforms are sinewave and squarewave.
>Frequency-range between 10Hz and 10 kHz.
>I need the control of amplitude, frequency and puls width with a PIC.
>Interfacing preferably with I2C or SPI.
>
>Any hints are wellcome.
>
>Regards Thomas

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