CEM3330 ETC1

Document overview

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Technical content

— ee ¢ > / CURTIS ELECTROMUSIC. SPECIALTIES Dual Voltage Controlled Amplifier The CEM 3330 and CEM 3335 and control mixing may be are dual, high performance, accomplished within the device voltage controlled amplifiers itself. Finally, the VCA outputs intended for electronic musical are signal currents, allowing the instrument and professional device to be conveniently used audio applications. For the in two-pole voltage controlled 3330, each amplifier includes filters, as well as dual voltage complete circuitry for simul- controlled amplifiers. ra taneous linear and exponential The 3335 is the same device ¢ : control of gain. In addition, the as the 3330 but without the s, operating point of the amplifiers linear control circuitry, and is 2 <a f may be set anywhere from Class intended for those applications x a B to Class A, allowing the user which require only the exponen- 1 raw to optimize those parameters tial control of gain. 9 critical te the particular appli- The eviews include an l cation. Also featured are on-chip 6.5 volt Zener, allowing virtual ground summing nodes them to operate off 15 volt for both the signal and linear supplies as well as +15, -5 volt control inputs, so that signal supplies. CEM 3330 Circuit Block and Connection Diagram F eatures exp. LINEAR @ Low Cost CNTL, SIGNAL. NTL TLO7t INPUT INPUT INPUT * @ Two Independent Voltage Siewat NESSI4 vv Controlled Amplifiers in a « +L] Single Package L a lsl= Si = 180KS ae 2% fete ons. nF @ Simultaneous Linear and g8 Exponential Control Inputs ‘ofl ‘ner Vee « vtsv @ Wide Control Range: 120dB = — = @ Very Accurate Control Scales wo] “sovevg. vv for Excellent Gain Tracking t— 7X @ Exceptionally Low Control ef | D te a Voltage Feedthrough: -60dB ror “Wevcestey minimum without trim, vw D we better than -80dB with trim Be o-vesriv | Low Distortion: Less than 0.1% Y HEC. « rae @ Exceptionally Low Noise: B Better than -100dB Bat SS, ADs |_| NI ava i—- 1 Class B to Class A Operation ow Ty © oY Tn 1 Summing Signal and Linear = Vv i 1K Control Inputs nee WN By ce oo gles 3 Re. SRIOLE @ Current Outputs for Ease of Fe Yous | uses g 100K J 6.2K yee oy Use in Voltage Controlled 180K woe [ey=]e 2 L 2-Pole Filters SIGNAL = = = = aureur ony = -asy > EXP. LINEAR 1 Can Be Used in VCO and {~ nese TN Sarur| mrt Mut VCE Control Paths Without . tte Causing Shift @ £15 Volt Supplies

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Electrical Characteristics

Vec = +15V Ta = 25°C = 10052 100 Exponential Control Range 120 150 - dB Linear Control Range 100 130 3B 2 Peak Cell Current, Icp Class B +400 +600 - uA wy — (input plus output) Class A #800 +1400 — uA a Exponential Control Scale Sensitivity 28 3.0 3.2 | mvidB toe Tempco of Exponential Control Scale +3000 +3300 +3600 |_ ppm TOK Sa Tempco of Linear Control Scale - #100 4300 | ppm aw Exponential Control Scale Error? - 03 1 aB FIGURE &: DISTORTION TRIM Linear Contro! Scale Error? O<icp<100uA] — 0.3 15 % Cell Current Gain Vg=0 83 1 1.2 SIGNAL Current Gain Tempco Vg=0 - #100 +300 | ppm =] = mor 2 fy _ | bos Converter Ourput lcc=!rer | -8 CY) +5 | mv wT ye Boe fr Output Voltage Compliance -3 - 413.5 v 1500F Untrimmed Distortion? Class B - 15 5 % poooodobo | Class A 03 1 % unenue Trimmed Distortion? Class 8 - 02 os | % p PREVENTION Class A = 05 0.2 % trot Untrimmed Control Feedthrough3 Class B 0.2 08 uA ' ov : Class A - 7 25 HA wg. y T= Trimmed Control Feedthrough? Class B - 01 08 uA tT Lot Class A =. 1 5 uA - signat - Output Noise Current in 20KHz Class 8 - 12 3.5 |nARMS nPuT Bandwidth (Vg = 0) Class A ~ 35 12 [nARMS FIGURE 5: GAIN CELL COMPENSATION FOR LARGER BANOWIDTH Signal Current Bandwidth4 Class B 30 100 - KHz Class A 100 350 - KHz smeve = (BY, StowAL Signal Current Slew Rate Class B 60 150 — | wus wove er Class A 400 750 - | wAlus a n A= Crosstalk Between VCAs F=10KHz | -60 -70 - 4B fees ” Internal Bias Current at Signal & Linear| Class B 80 175 360 | nA wx Control Inputs Class A 130 300 600 | nA ooo 002000 Exponential Control Input Current Ici = 100uA | 4 08 13 | yA awh Linear Control Input Offset Voltage 7 43 +15, mV "Y Signal Input Offset Voltage -15 5 +S mV voeyuoee 100K, “ Positive Supply Current Class B 08 13 24 mA Reve * Lcareuue Class A 24 27 37 mA a ve PREVENTION Positive Supply Range +9 - +18 v av = «MOOES 5 ~ - SIGNAL Negative Supply Range’ 45 18 v INPUT FIGURE 7: CONTROL REJECTION TRIM Note 1: From current gains of +20dB to -80dB. Peak cell current is less than 100uA. Note 2: Output signal is 10dB below clipping and is at a frequency of 1KHz. Vg = 0 Note 3: Current gain varies from unity to maximum attenuation (>110dB). Note 4: Peak Output Current is 4200. Note 5: Current limiting resistor required for negative voltages greater than -6 volts. Note 6: Class 8 is defined at an idle current of 14A; Class A is at an idle current of 100A. CRS ™ CURTIS ELECTROMUSIC SPECIALTIES - Covered by U.S. Patent #4,004,141. Curtis Electromusic Specialties (CES) assumes no responsibility for use of any circuitry described. No circuit licenses are implied. CES reserves the right, at any time without notice, to change said circuitry. Printed U.S.A. © 1980