? semiconductor components industries, llc, 1999 february, 2001 rev. 0 1 publication order number: and8052/d and8052/d high-performance cmos analog switches prepared by: fred zlotnick logic applications engineering introduction eleven new devices have recently been introduced by on semiconductor, adding to its large array of analog switches, already available. the new devices are offered in multigate and onegate configurations. this latest offering entails a lowresistance, high frequency response product, providing improved performance for a lower cost to the designer. less than 15ohms resistance the eleven new analog switches include the mc74lvx4066, 8051, and 8053; their ttlcompatible versions mc74lvxt4066, 8051, and 8053; two new onegate devices m7cvhc1g66 and 1gt66; and three new vhc products the mc74vhc4051, 4052, and 4053. the new devices compliment the standard offering of analog switches, multiplexers, and demultiplexers. designed as either a singlevoltage supply from two to six volts for the standard parts or five volts for the ttlcompatible ato versions, the additions will suit many applications. typical resistance values are less than 15 ohms for many of the devices when operating at five volts compared to the industrystandard of 80 ohms to 100 ohms. the multigate products are available in both 16lead soic, as well as tssop packages, while the singlegate devices are available in industrystandard sc88a, fivelead packages. ideal for wireless, analog or digital on semiconductor's new highperformance portfolio can be utilized in many diverse, applications and markets, including wireless, computing, and standard telecommunication systems. the devices primarily accomplish the switching, multiplexing, and demultiplexing of both analog and digital signals. many socalled digital signals are actually quasianalog in nature, such as frequency shift key (fsk), phaseshift key (psk), quadrature amplitude modulation (qam), code division multiplex (cdma), and time division multiplexing (tdma). as a result, they need to share the decoding from several different input sources, with minimum distortion to the signal. and in consumer products, switching between two or more analog sources is a constant requirement. as an example of an application (figure 1), one of eight sources could be selected to decode for a dolby digital or dts decoder. a stereo receiver would likely have a single audio decoder, but would need to switch between up to eight inputs to be connected to a single (potentially costly) decoder. the demultiplexer is not only low cost, but also minimizes the loss and distortion that is added to the circuit. the frequency required for an example, such as the one pictured, falls in the 10 mhz range. figure 1. http://onsemi.com application note
and8052/d http://onsemi.com 2 very highspeed cmos offerings among the eleven analogswitch family additions, on semiconductor is offering three new very high speed cmos (vhc) devices the mc74vhc4051, 4052, and 4053 that provide improved performance over previous offerings. these new vhc devices allow operation with both positive and negative supplies. this feature allows for switching an ac waveform that is centered approximately zero volts with no coupling capacitors. a 3.3 vsupply allows for a 5 v peaktopeak waveform, with lvttl/cmos compatibility. the dc level is preserved for the case of video switching. the vhc4053 is especially ideal for switching beyond 30 mhz. the following diagram (figure 2) illustrates switching two audio channels from three sources and three video channels simultaneously. the signal levels may be 2.5 volts. figure 2. two dynamic new onegate cmos two new singlegate products were also introduced into on semiconductor's advanced, submicron vhc family the mc74vhc1g66 and mc74vhc1gt66. these new devices offer a single analogswitch function and impressive acperformance levels. figure 3 illustrates a way to change a time constant in a loop filter application for fast aattacko stable aholdo using the mc74vhc1g66. figure 3.
and8052/d http://onsemi.com 3 notes
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