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AD7674 Datasheet(PDF) 14 Page - Analog Devices |
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AD7674 Datasheet(HTML) 14 Page - Analog Devices |
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14 / 28 page  AD7654 Rev. B | Page 14 of 28 APPLICATION INFORMATION CIRCUIT INFORMATION The AD7654 is a very fast, low power, single-supply, precise, simultaneous sampling 16-bit ADC. The AD7654 provides the user with two on-chip, track-and- hold, successive approximation ADCs that do not exhibit any pipeline or latency, making it ideal for multiple multiplexed channel applications. The AD7654 can also be used as a 4-channel ADC with two pairs simultaneously sampled. The AD7654 can be operated from a single 5 V supply and be interfaced to either 5 V or 3 V digital logic. It is housed in a 48-lead LQFP or tiny 48-lead LFCSP that combines space savings and allows flexible configurations as either a serial or parallel interface. The AD7654 is pin-to-pin compatible with PulSAR ADCs. MODES OF OPERATION The AD7654 features two modes of operation, normal and impulse. Each of these modes is more suitable for specific applications. Normal mode is the fastest mode (500 kSPS). Except when it is powered down (PD = HIGH), the power dissipation is almost independent of the sampling rate. Impulse mode, the lowest power dissipation mode, allows power saving between conversions. The maximum throughput in this mode is 444 kSPS. When operating at 10 kSPS, for example, it typically consumes only 2.6 mW. This feature makes the AD7654 ideal for battery-powered applications. TRANSFER FUNCTIONS The AD7654 data format is straight binary. The ideal transfer characteristic for the AD7654 is shown in Figure 17 and Table 7. The LSB size is 2*VREF/65536, which is about 76.3 μV. 000...000 000...001 000...010 111...101 111...110 111...111 ANALOG INPUT +FS – 1.5 LSB +FS – 1 LSB –FS + 1 LSB –FS –FS + 0.5 LSB Figure 17. ADC Ideal Transfer Function Table 7. Output Codes and Ideal Input Voltages Description Analog Input VREF = 2.5 V Digital Output Code FSR − 1 LSB 4.999924 V 0xFFFF1 FSR − 2 LSB 4.999847 V 0xFFFE Midscale + 1 LSB 2.500076 V 0x8001 Midscale 2.5 V 0x8000 Midscale − 1 LSB 2.499924 V 0x7FFF −FSR + 1 LSB −76.29 μV 0x0001 −FSR 0 V 0x00002 1 This is also the code for overrange analog input (VINx – VINxN above 2 × (VREF − VREFGND)). 2 This is also the code for underrange analog input (VINx below VINxN). |
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