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AD7771 Datasheet(PDF) 4 Page - Analog Devices |
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AD7771 Datasheet(HTML) 4 Page - Analog Devices |
4 / 14 page Rev. PrC | Page 3 of 13 GENERAL DESCRIPTION The AD7771 is an 8-channel simultaneously sampled, Analog- to-Digital Converter. There are 8 full Sigma Delta ADCs on- chip. The AD7771 provides a high input impedance to allow for direct sensor connection. Each input channel has a programmable gain stage catering for gains of 1,2,4,8 to map lower amplitude sensor outputs into the Full Scale ADC input range to maximize the Dynamic Range of the signal chain. The Analog inputs can accept unipolar 0 to 2.4V or true bipolar ±1.25V analog input signals with 3.3V or ±1.65V Analog Supply voltages respectively. The Analog inputs can be configured to accept True Differential or Single-Ended signals to match different sensor output configurations. Each channel contains an ADC modulator and Sinc 3/Sinc 5 low latency digital filters. A Sample Rate Converter (SRC) is provided to allow fine resolution control over the AD7771 Output Data Rate (ODR). This can be used in Power Quality Applications where the ODR resolution is required to maintain coherency with 0.01Hz changes in the line frequency. The SRC can be programmed through the SPI interface. The AD7771 implements two different interfaces, Data Output Interface and a SPI control Interface. The ADC Data Output interface is dedicated to transmitting the ADC conversion results from the AD7771 to the processor, acting as a master. The SPI interface is used to write to and read from the AD7771 configuration registers and for the control and reading of data from the SAR ADC. The SPI interface can also be configure to output the sigma delta conversion data. The AD7771 includes a 12-Bit SAR ADC. This ADC can be used for AD7771 diagnostics without having to decommission one of the Sigma Delta ADC channels dedicated to system measurement functions. With the use of an external multiplexer and signal conditioning, the SAR ADC can be used to validate the Sigma Delta ADC measurements in applications where Functional Safety is required. In addition, the AD7771 offers three GPIOs that can be used to control an external multiplexer. The AD7771 contains a 2.5V reference and reference buffer. The reference has a temperature co-efficient of 20 ppm/°C max. The AD7771 offers two modes of operation: High Resolution Mode and Low Power Mode. The High Resolution mode provides higher dynamic range while consuming 13 mW/ch and the Low Power mode consumes just 5 mW/ch at a reduced dynamic range specification. The specified operating temperature range is -40°C to +105°C while the part is operational up to +125°C. Input referred noise for SINC 3 and SINC5 filters, SINC5 ODR BW Gain1(uVrms/uVpp) Gain2(uVrms/uVpp) Gain4(uVrms/uVpp) Gain8(uVrms/uVpp) 128k 26098 30.20 22.80 19.20 17.20 64k 14122 13.70 10.10 8.28 7.46 32k 7215 7.40 4.79 3.63 3.14 16k 3627.5 4.65 2.74 1.87 1.54 8k 1816.2 3.17 1.79 1.17 0.93 4k 908.5 2.23 1.25 0.79 0.63 SINC3 ODR BW Gain1(uVrms/uVpp) Gain2(uVrms/uVpp) Gain4(uVrms/uVpp) Gain8(uVrms/uVpp) 32k 10045 11.91 7.00 4.79 3.84 16k 5076.2 5.60 3.35 2.37 1.99 8k 2545 3.64 2.10 1.42 1.15 4k 1273.5 2.51 1.42 0.93 0.74 2k 636.75 1.77 0.99 0.64 0.51 1k 318.5 1.25 0.71 0.45 0.36 Preliminary Technical Data AD7771 |
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