ADS8586SIPM

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1. Describe

The ADS8586SIPM device is a 6-channel, integrated data acquisition (DAQ) system Simultaneous sampling, 16-bit continuous approximation (SAR) analog-to-digital converters (ADCs) running channels at speeds up to 250 kSPS. The device features a complete analog front end for each channel, including a programmable gain amplifier (PGA) with high input impedance 1 MΩ, input clamp, low pass filter and ADC input driver. The device also features low drift, precision Use a buffer to drive the ADC reference. a flexible Supports serial, parallel and parallel digital interfaces Byte communication enables the device to be used with various host controllers. The ADS8586SIPM can be configured to accept ±10V or ±5V true bipolar input using a single 5V supply. High input impedance allows direct connection with sensors and transformers, thereby eliminating An external drive circuit is required. high Performance and accuracy, and zero latency The conversion provided by the device also enables The ADS8586S is an excellent choice for many industrial applications Automation and control applications.

2. Feature

    1. 16-bit ADC with integrated analog front end

    2. Simultaneous sampling: 6 channels

    3. Pin-Programmable Bipolar Inputs: ±10 V and ±5 V

    4. High input impedance: 1 MΩ

    5. 5V analog supply: 2.3V to 5V digital supply

    6. Overvoltage input clamp with 7kV ESD   

    7. Low drift, on-chip reference (2.5 V) and buffer

    8. Perfect performance:

        – 250-kSPS maximum throughput per channel

        – DNL: ±0.35 LSB; INL: ±0.45 LSB

        – Signal to Noise Ratio: 96.4dB; Total Harmonic Distortion: -114dB

    9. Over temperature performance:

         – Maximum offset drift: 3 ppm/°C

         – Gain drift: 6 ppm/°C

  10. On-chip digital filter for oversampling

  11. Flexible parallel, byte and serial interfaces 

  12. emperature range: –40°C to +125°C

  13. Package: 64-pin LQFP

3. Application

    1. Grid monitoring

    2. Protection relays

    3. Polyphase motor control      

    4.  ndustrial Automation and Control

    5. Multi-channel data acquisition system

4. Analog input

The ADS8586S has 6 analog input channels, so the positive input AIN_nP (n = 1 to 6) is a single-ended analog input and the negative input AIN_nGND is connected to GND. The device supports two bipolar single-ended input voltage ranges based on the logic level of the RANGE input pin. The input voltage range of all analog channels can be configured as bipolar ±10 V or ±5 V as described in the Ranges (Inputs) section. The device samples the voltage difference (AIN_nP – AIN_nGND) between the selected analog input channel and the analog input channel. AIN_nGND pin. The device allows a ±0.3V range on the AIN_nGND pins of all analog input channels. Use this feature in modular systems where the sensor or signal conditioning module is far from the ADC on the board and the ground potential of the sensor or signal conditioner may differ from the ADC ground. In this case, it is recommended to use a separate wire from the AIN_nGND pin of the device to the sensor or signal conditioning ground.

5. Analog input impedance

Each analog input channel in the device has a constant resistive impedance of 1 MΩ. The input impedance of each channel is independent of the input signal frequency, the ADC's configuration range, or the oversampling mode. The main advantage of this high impedance input is the ease of driving the ADC input There is no need to drive an amplifier with low output impedance. A bipolar high voltage power supply is not required in the system as this ADC does not require any high voltage front end drivers. In most applications, the signal source or sensor output can be connected directly to the ADC input, greatly simplifying the design of the signal chain. To maintain the DC accuracy of the system, match the external source impedance on the AIN_nP input A pin with an equivalent resistance on the AIN_nGND pin is recommended. This matching helps eliminate any additional offset errors caused by external resistors.

6. Input clamp protection circuit

The ADS8586S has an internal clamp protection circuit on each of the 6 analog inputs channel. It is recommended to use an external protection circuit as a secondary protection scheme to protect the equipment. Using external protection devices can help protect against surge, electrostatic discharge (ESD), and electrical fast transient (EFT) conditions. Input clamp protection circuitry on the ADS8586S allows each analog input to swing to a maximum voltage of ±15 V. Above ±15 V input voltage, the input clamp circuit opens, still on a single 5-V supply. no current in the clamp circuit for input voltages up to ±15 V. Beyond this voltage, the input clamp circuit turns on. For input voltages above the clamp threshold, make sure that input current never exceeds the absolute maximum rating of ±10 mA to prevent any damage to the device. In addition to limiting the input current, this resistor can also provide an antialiasing, low-pass filter when coupled with a capacitor. In order to maintain the dc accuracy of the system, matching the external source impedance on the AIN_nP input pin with an equivalent resistance on the AIN_nGND pin is recommended. This matching helps to cancel any additional offset error contributed by the external resistance.

7. Programmable Gain Amplifier (PGA)

The device offers a programmable gain amplifier (PGA) at each individual analog input channel that converts the original single-ended input signal into a fully-differential signal to drive the internal 16-bit ADC. The PGA also adjusts the common-mode level of the input signal before being fed into the ADC to ensure maximum usage of the ADC input dynamic range. Depending on the range of the input signal, the PGA gain can be adjusted accordingly by configuring the RANGE pin of the ADC . The PGA uses a very highly matched network of resistors for multiple gain configurations. Matching between these resistors and the amplifiers across all channels is accurately trimmed to keep the overall gain error low across all channels and input ranges.