Power Supply and Capacitance Issues

Question I developed my own measurement board based on the ADAS3023. I am having issues with the ADAS3023, sometimes after a RESET or Power On the part is not functioning as expected. Answer Check the power supply and ensure capacitance is not too high (capacitive overloading). If power is not at the desired level, consider using lower value caps. Check your power supply sequencing.

Question What power supplies does the ADAS3023 require? Answer The ADAS3023 requires these five supplies: AVDD = +5V, DVDD = + 5V, VDDH = + 15V, VSSH = - 15V, and VIO = 1.8V to 5V. The user must bring up the ADAS3023 power supplies in the following sequence in order to operate it normally: 1. VIO 2. VDDH 3. VSSH 4. DVDD 5. AVDD 6. REFx In order to operate the ADAS3023 from a + 5V single supply, the user would need to generate the required +/-15V high voltage supplies using one of our switching converters such as the ADP1613/14 in SEPIC-Cuk topology. Refer to CN-201 for complete information on this test setup.

Question What types of input signals the ADAS3023 can support? Answer The ADAS3023 can resolve the single ended unipolar or bipolar inputs using any of the four input ranges ±2.56 V, ±5.12 V, ±10.24 V, and ±20.48 V) of an internal PGIA and it can accept the commonly used single-ended input signals as shown in Error! Reference source not found., thus allowing the use of many sensor interfaces directly and handling the full range of industrial signal levels. Table 1. Typical Input Range Selection Signals Input Range, VIN (V) Single Ended* 0 V to 1 V ±1.28 V 0 V to 2.5 V ±2.56 V 0 V to 5 V ±5.12 V 0 V to 10 V ±10.24 V

Reserved (RSV) pins in CFG register = always set to 1

Question I have found an error in ADAS3023 datasheet, it is a functional description that is wrong. The problem is associated with the configuration register. There are 2 bits (3, 12) reserved and the datasheet specifies “RSV Reserved. Setting or clearing this bit has no effect.”. From what I have tested the adas3023 only works with the bits set to 1. Answer Yes, this is an error in the datasheet and the CFG register bits [3] and [12] should be “always set to 1”. By the way, there is also an error in DIN timing specs on page 7 of the datasheet. The data is always written on the rising edge, so it should state “DIN valid setup and hold time from SCK rising edge”. These errors will be corrected in the next revision of ADAS3023 datasheet.

Question What are the reference options available for the ADAS3023? Answer The ADAS3023 allows using one of the three types of references as shown below. • Internal, precision, low-drift 4.096V reference • External 2.5V reference using the on-chip buffer • External 4.096V reference with an external buffer

evaluation board for the ADAS3023?

Question Is there an evaluation board for the ADAS3023? Answer Yes, the EVAL-ADAS3023EDZ board can be used to evaluate the ADAS3023 part, which is compatible with the Converter Evaluation and Development board - EVAL-CED1Z. Refer to UG-515 for complete information on the EVAL-ADAS3023EDZ test setup.

Question What is ADAS3023? Answer The ADAS3023 is a SAR-based simultaneous sampling analog-to-digital data acquisition system IC manufactured on ADI’s proprietary iCMOS high-voltage industrial process technology that integrates an 8-channel, low leakage track and hold; a programmable gain instrumentation amplifier (four input ranges) with high common-mode rejection; a precision, low drift 4.096 V reference and buffer; and a 16-bit charge-redistribution analog-to-digital converter (ADC) with successive approximation register (SAR) architecture. The highly integrated ADAS3023 IC provides designers with an entire, factory calibrated multiplexed data acquisition signal chain that is specified to operate over the industrial temperature range of -40°C to +85°C. This means that data acquisition system designers no longer need to worry about signal buffering, common mode rejection, level shifting, amplification, rejection of noise, settling times or any of the other analog signal conditioning that was once a standard part of their design process while also allowing smaller form factor, faster time to market and lower costs. As well as tackling the main design challenges, the ADAS3023 delivers high AC and DC performance at 16-bit and offers true high impedance inputs and rejects common mode signals present on the inputs. • 16-Bit, ±3LSB INL min/max • 91.5 dB SNR typical • >500MΩ Input Impedance • 95dB CMRR typical

IBIS model available for the ADAS3023

Question Is there an IBIS model available for the ADAS3023 Answer Yes, please follow the link below: http://www.analog.com/en/analog-to-digital-converters/ad-converters/adas3023/pro ducts/product.html#product-designtools

ADAS3023: Recommended ADC driver, external reference and reference buffer options

Q What are the recommended ADC driver, external reference and reference buffer options? A The ADAS3023 datasheet recommends the ADA4841 and AD8031 as ADC driver (to drive auxiliary input pair - AUX±) and reference buffer, respectively. Other choices include ADA4897, AD8021/22, ADA4899, AD8605/15/55, etc. The recommended low-drift external references are ADR4540, ADR434, and ADR444.

ADAS3023 - power supply sequencing

Q: What is the correct power supply sequence for the ADAS3023 to operate properly? A: The ADAS3023 requires these five supplies: AVDD = +5V, DVDD = + 5V, VDDH = + 15V, VSSH = - 15V, and VIO = 1.8V to 5V. The user must bring up the ADAS3023 power supplies in the following sequence in order to operate it normally: 1. VIO 2. VDDH 3. VSSH 4. DVDD 5. AVDD 6. REFx In order to operate the ADAS3023 from a + 5V single supply, the user would need to generate the required +/-15V high voltage supplies using one of our switching converters such as the ADP1613/14 in SEPIC-Cuk topology. Refer to CN-201 for complete information on this test setup.

What types of input signals does the ADAS3023 support? Can it convert true differential signals?

Q: What types of input signals does the ADAS3023 support? Can it convert true differential signals? A: The ADAS3023 can resolve single-ended unipolar or bipolar inputs using any of the four input ranges (±2.56V,±5.12V, ±10.24V, and ±20.48V) of an internal PGIA and it can accept the commonly used single-ended input signals as shown in Table 1 of the ADAS3023 datasheet, thus allowing the use of many sensor interfaces directly and handling the full range of industrial signal levels. Its architecture doesn't allow you to convert true differential signals between any two channels. Table 1. Typical Input Range Selection Single-Ended Signals Input Range, VIN 0V to 1V ±1.28V 0V to 2.5V ±2.56V 0V to 5V ±5.12V 0V to 10V ±10.24V

ADAS3023: What are the target markets/applications for this product?

Q What are the target markets/applications for this product? A The ADAS3023 is highly integrated, leading to significantly reduced signal chain form factor, and competitively priced making it ideal for precision data acquisition applications for the industrial and instrumentation markets such as: • Multichannel data acquisition and system monitoring • Process control – I/O cards • Power line monitoring • Automated test equipment • Patient monitoring • Instrumentation

ADAS3023: What package is this part offered in?

Q What package is this part offered in? A The ADAS3023 is offered in a 6mm X 6mm, 40 lead, Lead Frame Chip Scale Package (LFCSP_VQ) with pin pitch of 0.5mm.

ADAS3023: headroom requirement

Q What is the headroom requirement of the ADAS3023 inputs from the high voltage supplies? A In other words, the specified operating input voltage of any input pin requires at least 2.5 V of headroom from the VDDH and VSSH supplies. (VSSH + 2.5 V) ≤ INx/COM ≤ (VDDH – 2.5 V)

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