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LTC1064CN Datasheet(PDF) 7 Page - Linear Technology |
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LTC1064CN Datasheet(HTML) 7 Page - Linear Technology |
7 / 16 page 7 LTC1064 APPLICATIONS INFORMATION Figure 2. Example Ground Plane Breadboard Technique for LTC1064 ANALOG CONSIDERATIONS Grounding and Bypassing The LTC1064 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 0.1 µF ceramic capacitor with leads as short as possible. Pin 19 (V –) should be bypassed with a 0.1 µF ceramic capacitor. 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 2 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. Protoboards are not recommended. Buffering the Filter Output When driving coaxial cables and 1 × scope probes, the filter output should be buffered. This is important espe- cially when high Qs are used to design a specific filter. Inadequate buffering may cause errors in noise, distor- tion, Q and gain measurements. When 10 × probes are used, buffering is usually not required. An inverting buffer is recommended especially when THD tests are per- formed. As shown in Figure 3, the buffer should be adequately bypassed to minimize clock feedthrough. ANALOG GROUND PLANE 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) LTC1064 0.1 µF CERAMIC PIN 1 IDENT 1064 F02 5k –7.5V 7.5V 0.1 µF CERAMIC (SINGLE POINT GROUND) CLOCK VIN 1 2 3 4 5 6 7 8 9 10 11 12 DIGITAL GROUND PLANE 24 23 22 21 20 19 18 17 16 15 14 13 |
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