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AD7612 数据表(PDF) 18 Page - Analog Devices |
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AD7612 数据表(HTML) 18 Page - Analog Devices |
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18 / 32 page  AD7612 Rev. 0 | Page 18 of 32 MODES OF OPERATION The AD7612 features three modes of operation: warp, normal, and impulse. Each of these modes is more suitable to specific applications. The mode is configured with the input pins, WARP and IMPULSE, or via the configuration register. See Table 6 for the pin details and the Hardware Configuration section and Software Configuration section for programming the mode selection with either pins or configuration register. Note that when using the configuration register, the WARP and IMPULSE inputs are don’t cares and should be tied to either high or low. Warp Mode Setting WARP = high and IMPULSE = low allow the fastest con- version rate up to 750 kSPS. However, in this mode, the full specified accuracy is guaranteed only when the time between conversions does not exceed 1 ms. If the time between two consecutive conversions is longer than 1 ms (after power-up), the first conversion result should be ignored since in warp mode, the ADC performs a background calibration during the SAR conversion process. This calibration can drift if the time between conversions exceeds 1 ms thus causing the first conversion to appear offset. This mode makes the AD7612 ideal for applications where both high accuracy and fast sample rate are required. In addition, the AD7612 can run up to 900 kSPS throughput with some performance degradation, mainly dc linearity. Normal Mode Setting WARP = IMPULSE = low or WARP = IMPULSE = high allows the fastest mode (600 kSPS) without any limitation on time between conversions. This mode makes the AD7612 ideal for asynchronous applications such as data acquisition systems, where both high accuracy and fast sample rate are required. Impulse Mode Setting WARP = low and IMPULSE = high uses the lowest power dissipation mode and allows power saving between conversions. The maximum throughput in this mode is 500 kSPS and in this mode, the ADC powers down circuits after conversion making the AD7612 ideal for battery-powered applications. TRANSFER FUNCTIONS Using the OB/2C digital input or via the configuration register, the AD7612 offers two output codings: straight binary and twos complement. See Figure 26 and Table 7 for the ideal transfer char- acteristic and digital output codes for the different analog input ranges, VIN. Note that when using the configuration register, the OB/2C input is a don’t care and should be tied to either high or low. 000...000 000...001 000...010 111...101 111...110 111...111 ANALOG INPUT +FSR – 1.5 LSB +FSR –1LSB –FSR + 1 LSB –FSR –FSR + 0.5 LSB Figure 26. ADC Ideal Transfer Function Table 7. Output Codes and Ideal Input Voltages VREF = 5 V Digital Output Code Description VIN = 5 V VIN = 10 V VIN = ±5 V VIN = ±10 V Straight Binary Twos Complement FSR − 1 LSB 4.999924 V 9.999847 V +4.999847 V +9.999695 V 0xFFFF1 0x7FFF1 FSR − 2 LSB 4.999847 V 9.999695 V +4.999695 V +9.999390 V 0xFFFE 0x7FFE Midscale + 1 LSB 2.500076 V 5.000153 V +152.6 μV +305.2 μV 0x8001 0x0001 Midscale 2.5 V 5.000000 V 0 V 0 V 0x8000 0x0000 Midscale − 1 LSB 2.499924 V 4.999847 V −152.6 μV −305.2 μV 0x7FFF 0xFFFF −FSR + 1 LSB 76.3 μV 152.6 μV −4.999847 V −9.999695 V 0x0001 0x8001 −FSR 0 V 0 V −5 V −10 V 0x00002 0x80002 1 This is also the code for overrange analog input (VIN+ − VIN− above VREF − VREFGND). 2 This is also the code for overrange analog input (VIN+ − VIN− below VREF − VREFGND). |
类似零件编号 - AD7612 |
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类似说明 - AD7612 |
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