AD7118 Analog Devices, AD7118 Datasheet
AD7118
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AD7118 Summary of contents
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... Function Generators GENERAL DESCRIPTION ® The LOGDAC AD7118 is a CMOS multiplying D/A con- verter which attenuates an analog input signal over the range 0 to –85 1.5 dB steps. The analog output is determined by a six-bit attenuation code applied to the digital inputs. Operating frequency range of the device is from dc to several hundred kHz ...
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... AD7118–SPECIFICATIONS Parameter NOMINAL RESOLUTION ACCURACY RELATIVE AD7118L/C –30 dB –31 –42 dB –43 –48 dB AD7118K/B –30 dB –31 –42 dB MONOTONIC RANGE Nominal 1.5 dB Steps L/C/U Grade K/B/T Grade Nominal 3 dB Steps All Grades V INPUT RESISTANCE All Grades IN (PIN 12) L/C/U Grade K/B/T Grade ...
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... ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the AD7118 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality ...
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... AD7118 CIRCUIT DESCRIPTION GENERAL CIRCUIT INFORMATION The AD7118 consists of a 17-bit R-2R CMOS multiplying D/A converter with extensive digital input logic. The logic translates the 6-bit binary input into a 17-bit word which is used to drive the D/A converter. Table I gives the nominal output voltages (and levels relative for all possible input codes. ...
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... Feedthrough and absolute accuracy for attenuation levels be- yond 42 dB are sensitive to output leakage current effects. For this reason it is recommended that the operating temperature of the AD7118 be kept as close practically possible, particularly where the device’s performance at high attenuation levels is important. A typical plot of leakage current vs. tempera- ture is shown in Figure 10 ...
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... AD7118 –Typical Performance Characteristics Figure 7. Digital Threshold & Power Supply Current vs. Power Supply Figure 8. DC Attenuation Error vs. Attenuation & V Figure 9. DC Attenuation Error vs. Attenuation & Temperature Figure 10. Output Leakage Current as Temperature and 15 Volts DD Figure 11. Frequency Response with AD544 and ...