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LTC1065CN8 Datasheet(PDF) 6 Page - Linear Technology |
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LTC1065CN8 Datasheet(HTML) 6 Page - Linear Technology |
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6 / 16 page  6 LTC1065 1065fb INPUT FREQUENCY (kHz) 0 45 40 35 30 25 20 15 10 5 0 621 3 918 15 12 VS = ±5V fC = 10kHz 1065 G17 CC HARA TERISTICS A TYPICALPERFOR CE HORIZONTAL: 0.1ms/DIV, VERTICAL: 2V/DIV VS = ±5V, fC = 10kHz, VIN = 1kHz ±3VP SQUARE WAVE 1065 G16 Transient Response Group Delay PI FU CTIO S Power Supply Pins (Pins 6, 3, N Package) The positive and negative supply pin should be bypassed with a high quality 0.1 µFceramiccapacitor.Inapplications where the clock pin (5) is externally swept to provide several cutoff frequencies, the output DC offset variation is minimized by connecting an additional 1 µF solid tanta- lum capacitor in parallel with the 0.1 µF disc ceramic. This technique was used to generate the graphs of the output DC offset variation versus clock; they are illustrated in the Typical Performance Characteristics section. When the power supply voltage exceeds ±7V, and when V – is applied before V+ (if V+ is allowed to go below ground) connect a signal diode between the positive supply pin and ground to prevent latch-up (see Typical Applications). Ground Pin (Pin 2, N Package) The ground pin merges the internal analog and digital ground paths. The potential of the ground pin is the reference for the internal switched-capacitor resistors, and the reference for the external clock. The positive input of the internal op amp is also tied to the ground pin. For dual supply operation, the ground pin should be connected to a high quality AC and DC ground. A ground plane, if possible, should be used. A poor ground will degrade DC offset and it will increase clock feedthrough, noise and distortion. A small amount of AC current flows out of the ground pin whether or not the internal oscillator is used. The fre- quency of the ground current equals the frequency of the clock. The average value of this current is approximately 55 µA, 110µA, 170µA for ±2.5V, ±5V and ±7.5V supplies respectively. For single supply operation, the ground pin should be preferably biased at half supply (see Typical Applications). VOS Adjust Pin (Pin 8, N Package) The VOS adjust pin can be used to trim any small amount of output DC offset voltage or to introduce a desired output DC level. The DC gain from the VOS adjust pin to the filter output pin equals two. Any DC voltage applied to this pin will reflect at the output pin of the filter multiplied by two. If the VOS adjust pin is not used, it should be shorted to the ground pin. The DC bias current flowing into the VOS adjust pin is typically 10pA. The VOS adjust pin should always be connected to an AC ground; AC signals applied to this pin will degrade the filter response. |
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