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HA-5340 Datasheet(PDF) 5 Page - Intersil Corporation |
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HA-5340 Datasheet(HTML) 5 Page - Intersil Corporation |
5 / 8 page 5 Application Information The HA-5340 has the uncommitted differential inputs of an op amp, allowing the Sample and Hold function to be combined with many conventional op amp circuits. See the Intersil Application Note AN517 for a collection of circuit ideas. Layout A printed circuit board with ground plane is recommended for best performance. Bypass capacitors (0.01 µF to 0.1µF, ceramic) should be provided from each power supply terminal to the Supply Ground terminal on pin 13. The ideal ground connections are pin 6 (SIG. GND) directly to the system Signal Ground, and pin 13 (Supply Ground) directly to the system Supply Common. Hold Capacitor The HA-5340 includes a 135pF MOS hold capacitor, sufficient for most high speed applications (the Electrical Specifications section is based on this internal capacitor). Additional capacitance may be added between pins 7 and 11. This external hold capacitance will reduce droop rate at the expense of acquisition time, and provide other trade-offs as shown in the Performance Curves. The hold capacitor CH should have high insulation resistance and low dielectric absorption, to minimize droop errors. Teflon®, polystyrene and polypropylene dielectric capacitor types offer good performance over the specified operating temperature range. The hold capacitor terminal (pin 11) remains at virtual ground potential. Any PC connection to this terminal should be kept short and “guarded” by the ground plane, since nearby signal lines or power supply voltages will introduce errors due to drift current. ®Teflon is a registered Trademark of Dupont Corporation. Typical Application Figure 5 shows the HA-5340 connected as a unity gain noninverting amplifier - its most widely used configuration. As an input device for a fast successive - approximation A/D converter, it offers very high throughput rate for a monolithic IC sample/hold amplifier. Also, the HA-5340’s hold step error is adjustable to zero using the Offset Adjust potentiometer, to deliver a 12-bit accurate output from the converter. The HA-5340 output circuit does not include short circuit protection, and consequently its output impedance remains low at high frequencies. Thus, the step changes in load current which occur during an A/D conversion are absorbed at the S/H output with minimum voltage error. A momentary short circuit to ground is permissible, but the output is not designed to tolerate a short of indefinite duration. +15V VIN CH 50k Ω 34 9 5 7 1 2 14 15pF 13 6 SYSTEM POWER GROUND 5 9 CONVERT 13 INPUT DIGITAL OUTPUT H S S/H CONTROL -15V HA 5340 - HI 774 - OFFSET ADJUST ≈ ±15mV ANALOG COMMON R/C SYSTEM SIGNAL GROUND 11 NOTE: Pin Numbers Refer to DIP Package Only. 120pF FIGURE 5. TYPICAL HA-5340 CONNECTIONS; NONINVERTING UNITY GAIN MODE HA-5340 |
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