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LTC1164ACN Datasheet(PDF) 8 Page - Linear Technology |
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LTC1164ACN Datasheet(HTML) 8 Page - Linear Technology |
8 / 16 page LTC1164 8 1164fa ANALOG CONSIDERATIONS 1. Grounding and Bypassing The LTC1164 should be used with separated analog and digital ground planes and single point grounding techniques. Pin 6 (AGND) should be tied directly to the analog ground plane. Pin 7 (V+) should be bypassed to the ground plane with a 0.1µF ceramic disk with leads as short as possible. Pin 19 (V–) should be bypassed with a 0.1µF ceramic disk. For single supply applications, V– can be tied to the analog ground plane. For good noise performance, V+ and V– must be free of noise and ripple. All analog inputs should be referenced directly to the single point ground. The clock inputs should be shielded from and/or routed away from the analog circuitry and a separate digital ground plane used. Figure 3 shows an example of an ideal ground plane design for a two sided board. Of course this much ground plane will not always be possible, but users should strive to get as close to this as possible. Proto boards are not recommended. 2. Buffering the Filter Output When driving coaxial cables and 1x scope probes, the filter output should be buffered. This is important especially when high Qs are used to design a specific filter. Inadequate buffering may cause errors in noise, distortion, Q, and gain measurements. When 10x probes are used, buffering is usually not required. A buffer is recommended especially when THD tests are performed. As shown in Figure 4, the buffer should be adequately bypassed to minimize clock feedthrough. Figure 3. Example Ground Plane Breadboard Technique for LTC1164 APPLICATIO S I FOR ATIO LTC1164 • AI01 DIGITAL GROUND PLANE ANALOG GROUND PLANE 7.5V –7.5V VIN 0.1µF CERAMIC DISK 0.1µF CERAMIC DISK CLOCK (SINGLE POINT GROUND) NOTE: CONNECT ANALOG AND DIGITAL GROUND PLANES AT A SINGLE POINT AT THE BOARD EDGE FOR BEST HIGH FREQUENCY RESPONSE PLACE RESISTORS PARALLEL TO DOUBLE SIDED COPPER CLAD BOARD AND LAY FLAT (4 RESISTORS SHOWN HERE TYPICAL) 1 2 3 4 5 6 10 11 12 24 23 22 15 14 13 • PIN 1 DENT 7 21 20 18 17 8 9 16 19 |
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