SSM2044 Design

[Bob Zimmer]

At 09:40 PM 9/6/97 +0100, you wrote:
>Hi FOlks, 
>Does anyone know much about the SSM2044? I've got four of these chips 
>and reckon that it'd be a good idea to come up with a circuit to match 
>the rest of the Modulus gear using them but......
>Am I right in thinking the resonance is voltage controlled on this 
>chip....from what I've got (a print-out of BJ's design and an old 
>Maplin kit design) it seems to be.
>What is the range of CV's acceptable to the chip? is it rail to rail 
>or 0-10V or 0-1V or what?
>What is the audio level acceptable to the chip?
>
>chrisc

Chris,

Here are the operating specifications:

Parameter                  Min     Typ     Max     Units     Conditions
Positive Supply Range      +5      +15     +18       V
Negative Supply Range      -5      -15     -18       V
Positive Supply Current    1.0     1.4     2.0       mA      Vfc = GND
Negative Supply Current    4.5     6.2     8.0       mA      Vfc = GND

Freq Control Range       10,000:1 50,000:1
Freq Control Feedthrough    --     -36db   -26db             Vs+ = Vs- = GND
                                                             -90mV <= Vfc
<= +90mV
Output Offset Io/IoMax             0.05    0.2               Vs+ = Vs- =
Vfc = GND
Freq Control Offset f/fnom  0.6    1       1.5               Untrimmed

Q Control Input Impedance   675    900     1200      Ohm     Vqc >= 0.7V
Q Current at Oscillation    450    500     550       uA      -90mV <= Vfc
<= +90mV
Q Control Feedthrough       --     -30db   -20db
Q Control Threshold Voltage 400    500               mV

Max Avail Control Current   1.25   1.7     2.2       mA      Vpin 13 = -120mV
Freq Control Input Range    -120   --      +180      mV
Max Out Signal Current IoMax+-300  +-400   +-520     uA
Signal to Noise             --     70db    --                RE: 30mVpp
(Pin 1 or 15)

Hope this helps!


  >=== Bob Zimmer -- Phila, PA     bzimmer at voicenet.com ===<
  >===         http://www.voicenet.com/~bzimmer/        ===<
  >=== "Oat-bran noise is more likely to be an issue in ===<
  >=== situations where cereal data ia concerned [:-)]" ===<
  >===         Analog Dialogue - Analog Devices         ===<