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AD7740YRMZ データシート(PDF) 4 Page - Analog Devices |
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AD7740YRMZ データシート(HTML) 4 Page - Analog Devices |
4 / 11 page –4– PIN FUNCTION DESCRIPTIONS 8-LEAD microSOIC PIN NUMBERS * Pin No. Mnemonic Function 1 CLKOUT The crystal/resonator is tied between this pin and CLKIN. In the case of an external clock driving CLKIN, an inverted clock signal appears on this pin and can be used to drive other circuitry provided it is buffered first. 2 CLKIN The master clock for the device may be in the form of a crystal/resonator tied between this pin and CLKOUT. An external CMOS-compatible clock may also be applied to this input as the clock for the device. If CLKIN is inactive low for 1 ms (typ), the AD7740 automatically enters power-down. 3 GND Ground reference for all the circuitry on-chip. 4 REFIN/OUT Voltage Reference Input. This is the reference input to the core of the VFC and defines the span of the VFC. If this pin is left unconnected, the internal 2.5 V reference is the default reference. Alternatively, a precision external reference may be used to overdrive the internal reference. The internal reference has high output impedance in order to allow it to be overdriven. 5 VIN The analog input to the VFC. It has a nominal input range from 0 V to VREF which corresponds to an output frequency of 10% fCLKIN to 90% fCLKIN. It has a ±150 mV overrange. If buffered, it draws virtually no current from whatever source is driving it. 6 VDD Power Supply Input. These parts can be operated at 3.3 V ± 10% or 5 V ± 5%. The supply should be adequately decoupled with a 10 µF and a 0.1 µF capacitor to GND. 7 FOUT Frequency Output. FOUT goes from 10% to 90% of fCLKIN, depending on VIN. 8 BUF Buffered Mode Select Pin. When BUF is tied low, the VIN input is unbuffered and the range on the VIN pin is –0.15 V to VDD + 0.15 V. When it is tied high, VIN is buffered and the range on the VIN pin is restricted to 0.1 V to VDD – 0.2 V. *Note that the SOT-23 and microSOIC packages have different pinouts. ORDERING GUIDE Package Branding Model Temperature Range Package Description Option Information AD7740KRM 0 °C to 85°C microSOIC Package RM-8 VOK AD7740YRT –40 °C to +105°C SOT-23 Package RT-8 VOY AD7740YRM –40 °C to +105°C microSOIC Package RM-8 VOY PIN CONFIGURATIONS 8-Lead microSOIC microSOIC TOP VIEW (Not to Scale) 8 7 6 5 1 2 3 4 CLKOUT CLKIN GND REFIN/OUT BUF FOUT VDD VIN AD7740 8-Lead SOT-23 SOT-23 TOP VIEW (Not to Scale) 8 7 6 5 1 2 3 4 BUF FOUT VDD VIN CLKOUT CLKIN GND REFIN/OUT AD7740 REV. A AD7740 |
同様の部品番号 - AD7740YRMZ |
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同様の説明 - AD7740YRMZ |
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