ADS8688 AD 16-bit 500kSPS single/bipolar input 8-channel SAR/ADC data acquisitio

Product Description

shipping list

ADS8688 module shipping list

Physical module + PDF schematic diagram + routine source code + after-sales technical support + electrostatic bag packaging + shockproof foam

Tips:

(1) The module interface of our store is clear and the performance is stable. Please use the information provided by our store to do functional verification under the corresponding experimental conditions.

(2) The basic parameters of this module are in the details page. The module information PDF file, the source code of the routine, and the engineering file are not provided. Please be aware of the buyer. If you have any operational problems, please contact customer service.

(3) Before using the module, please read the details page of this module to understand the power supply and usage restrictions, so as to avoid damage to the module due to improper operation.

(4) All modules in our shop guarantee to provide real module parameters, functions and pictures. All modules are tested and shipped.

Module parameters

• Module model: ADS8688

• Module type: analog-to-digital conversion module ADC

• Module power supply: 5V

• Static power consumption: <2.2mA (for reference only)

• Module communication protocol: SPI serial

• Input impedance: 1M ohm

• Number of input channels: 8

• Reference voltage: default internal 4.069V (weldable S0T-23 package external input reference)

• Input range: Bipolar: ±10.24V, ±5.12V and ±2.56V/Unipolar: 0V to 10.24V and 0V to 5.12V (software switching range)

• Resolution: 16 bits

• Chip maximum sampling rate: 500kSPS (total throughput)

• The module provides routines: STM32F 103RBT6 (analog SPI)

• Module features: multiple (programmable gain amplifier (PGA) integrated inside the chip, and on-chip reference voltage with low temperature drift, constant resistive input impedance)

• Module application: various (electric power automation, protection of middle-dimensional devices, factory automation andProcess control, etc.)

• Module weight: 13g

• PCB size.: 50X 50 length X width (mm)

• Module interface: 3.81-8P socket, XH2.54 double row pin

Module description：

• ADS8688 is an 8-channel integrated data acquisition system, which is based on a 16-bit successive approximation (SAR) analog-to-digital converter (ADC) with a throughput of up to 500kSPS during operation.These devices provide an integrated analog front-end circuit (overvoltage protection up to ±20V) for each input channel, an 8-channel multiplexer that supports automatic and manual scan modes, and an on-chip 4.096V reference voltage with low temperature drift.When powered by a single 5V analog power supply, each input channel on the device can support actual bipolar input ranges of ±10.24V, ±5.12V, and ±2.56V, and unipolar input ranges of 0V to 10.24V and 0V to 5.12V.

• The gain of the analog front end in all input ranges has been precisely fine-tuned to ensure high DC accuracy.The selection of the input range can be programmed by software, and the selection of the input range of each channel is related toIndependent.The device provides a constant resistive input impedance of 1MΩ (regardless of the selected input range).

Interface diagram

Dimensions

Precautions：

(1) The module is a low-power module, it is recommended that the power supply does not exceed 5.25V.

(2) Since the module is a high-precision device, in order to avoid unnecessary interference, it is recommended to use a linear power supply.

(3) It is recommended that the input and output signal lines be as short as possible, too long may easily introduce noise signals.Poor contact or poor quality cables may cause signal attenuation or excessive noise.

(4) The delivered code is only for the main control board of our store. The program is fully commented and does not explain the program. Functions other than the baby details display need to be developed by yourself.

(5) If you need to simply test the function of the module, it is recommended to use it with the control panel of our store. After the correct wiring, power the control panel to realize the signal acquisition and display.

Test chart：

1. All channels are grounded

2. Channel 1 inputs 8V and other channels are floating (note: the voltage is not 0 when floating)

3. Channel 1 input -8V and other channels are floating (note: the voltage is not 0 when floating)

common problem
Q: Can the module measure negative voltage?
A: Yes, when the range is selected as bipolar, negative voltage can be measured.

Q: Is the maximum value 65535? How to convert to voltage?
A: When the selected range is bipolar, 0V corresponds to 32767, so V=(ADC value-327
67)*Range/65535; when the range is unipolar, there is no need to subtract 32767.

Q: Does each channel independently have a 500kSPS data update rate?
A: The maximum total throughput of ADS8688 is 500kSPS. The throughput of each channel depends on
For the number of channels selected in the multiplexer scan sequence. If only two channels are selected,
The throughput of each channel is equal to 250kSPS, if four channels are selected, it is equal to
125 kSPS per channel, and so on.

Q: What is the difference between AUX and other channels?
A: The AUX channel is directly connected to the high-precision 16-bit ADC through the multiplexer inside the chip
Connection; because there is no front-end PGA, the AUX channel only supports unipolar 0V to VREF
性input range.

Q: Can the input range be configured independently for each channel?
A: Each channel of ADS8688 has PGA, so the input range and polarity can be configured independently.

Q: For example, give a voltage: 2.1234V for the module to keep collecting, it
What is the result? Will the value jump?
A: The data must be fluctuating, this is not determined by a single condition, power ripple noise
Sound, long wire and other factors will affect it.
Q: ADS8688 is not accurate in collecting small voltage signals. What is the situation?
A: It may be that the range configuration is too large, and it can be reasonable according to the signal range you want to collect
Set the chip measuring range (PGA).

Q: After the module is driven normally, the pins that are not connected to voltage also show voltage. Is it normal?
A: The module defaults to 8 channels to collect all the time, and it will also collect when there is no voltage connected.
The floating voltage collected on the pin can be directly grounded, which is zero voltage.

About Prime Living

Prime Living is a Canadian online store offering a carefully selected range of quality products for home, automotive, tools, outdoor living, electronics and more.

We are committed to fast order processing, secure packaging and reliable tracked shipping to provide an excellent shopping experience.

Shipping policy

We carefully handle each order to ensure your package arrives quickly and safely. Please note that factors such as weather, postal traffic, or carrier performance may occasionally cause delays beyond our control.

We provide free shipping and dispatch all orders within 2 business days of payment, often sooner. All shipments are sent via international express air shipping, with a tracking number provided so you can follow your order every step of the way.

. Please provide a physical address, as we do not ship to P.O. Boxes.

Returns

Your satisfaction is important to us. Hexlight offers a 14-day Free return policy: if you are not fully satisfied with your purchase, you may request either a full refund or an exchange. All return shipping costs are fully covered by us.

Condition

Brand New

Shipping

This item is shipped directly from our supplier in China with tracking.