ODP: VCA610 (Burr-Brown)

[Roman Sowa]

Why don't you use SSM2164 since you want to use it only
for audio?
It has much higher gain control range, probably less distortion
and few other parameters that I can't recall, and it costs 147 times less!

Or if you want high BW, take Analog Devices AD603 with only 43dB
gain range, but few times cheaper than BB VCA610

There are also others like SSM2118 etc.

Roman


> -----Oryginalna wiadomość-----
> Od:	Edu Silva [SMTP:edusilva at bahianet.com.br]
> Wysłano:	13 lutego 1999 20:49
> Do:	Synth-DIY
> Temat:	VCA610 (Burr-Brown)
> 
> I suppose everybody in this list knows this chip and will tell me it
> doesn't works well, but I must ask...
> 
> Any synth applications for it?
> 
> VCA610
> Wideband Voltage Controlled Amplifier
> ------------------------------------------------------------------------
> FEATURES 
> 
> *WIDE GAIN CONTROL RANGE: 80dB 
> *SMALL PACKAGE: 8-pin SOIC or DIP 
> *WIDE BANDWIDTH: 30MHz 
> *LOW VOLTAGE NOISE: 2.2nV/sqrt(Hz) 
> *FAST GAIN SLEW RATE: 300dB/?s 
> *EASY TO USE 
> 
> APPLICATIONS 
> 
> *ULTRASOUND 
> *AGC AMPLIFIER 
> *ANALYTICAL INSTRUMENTATION 
> *SONAR 
> *ACTIVE FILTERS 
> *LOG AMPLIFIER 
> *IF CIRCUITS 
> *CCD CAMERAS 
> 
> DESCRIPTION
> 
> The VCA610 is a wideband, continuously variable, voltage controlled gain
> amplifier. It provides linear-dB gain control with high impedance inputs.
> It is designed to be used as a flexible gain control element in a variety
> of electronic systems.
> 
> The VCA610 has a gain control range of 80dB (-40dB to +40dB) providing
> both
> gain and attenuation for maximum flexibility in a small 8-pin SOIC or
> plastic dual-in-line package. The broad attenuation range can be used for
> gradual or controlled channel turn-on and turn-off for applications in
> which abrupt gain changes can create artifacts or other errors. In
> addition, the output can be disabled to provide -80dB of attenuation.
> Group
> delay variation with gain is typically less than ?2ns across a bandwidth
> of
> 1 to 15MHz.
> 
> The VCA610 has a noise figure of 3.5dB (with an RS of 200(ohm)) including
> the effects of both current and voltage noise. Instantaneous output
> dynamic
> range is 70dB for gains of 0dB to +40dB with 1MHz noise bandwidth. The
> output is capable of driving 100(ohm). The high speed, 300dB/?s, gain
> control signal is a unipolar voltage that varies the gain linearly in
> dB/V.
> 
> The VCA610 is designed with a very fast overload recovery time of only
> 200ns. This allows a large signal transient to overload the output at high
> gain, without obscuring low-level signals following closely behind. The
> excellent overload recovery time and distortion specifications optimize
> this device for low-level doppler measurements.
> 
> DATASHEET:
> 
> http://www.burr-brown.com/download/DataSheets/VCA610.pdf
> 
> Edu
> _____________________
> ES2 Audio - Som & Luz
> Salvador-Bahia-Brasil
>