®
AMERICAN MICROSYSTEMS, INC
SINEGEN
June, 1998 Preliminary AMI 0.8 micron CMOS
CWL Double Poly
1
Sinegen
FEATURES
• Power down Mode.
• Implemented with a combination
switch capacitor DAC and filter.
DESCRIPTION
Sine wave generator
PIN DESCRIPTION
MAME TYPE DESCRIPTION
CLK Digital Input Clock input, 64 times the sine freq, ~50% duty
TONEenbl Digital Input Enables the sine wave output, active high
Vref2x4 Analog Input Voltage reference of 2.4 V
Vref1x9 Analog Input Voltage reference of 1.9 V
Vref1x4 Analog Input Voltage reference of 1.4 V
PDN Digital Input Powers down the cell, active low
SINE Analog Output Sine wave output
Vdd Power Positive supply voltage
Vss Ground Negative supply voltage
AC ELECTRICAL CHARACTERISTICS
PARAMETER CONDITION MIN TYP MAX UNIT
Supply Voltage Range 4.5 5.5 V
Supply Current 0.75 1.5 mA
Temperature -10 70 °C
Frequency Range 0.5 3.0 KHz
Output Amplitude 0.36 V Peak 0.254 V RMS
Amplitude Error Across
Frequency Range -0.25 dB
(-3%) +0.25 dB
(+3%)
Total Harmonic Distortion -29 DB
COMMENTS
Vdd
CLK
TONEenbl SINEGEN
Vref2x4
Vref1x9
SINE
Vref1x4
PDN
Vss
®
AMERICAN MICROSYSTEMS, INC
SINEGEN
June, 1998 Preliminary AMI 0.8 micron CMOS
CWL Double Poly
2
This Circuit was designed for a DTMF generator, and thus the output drivers were not
laid out for external output.
