Feature: T&M
accuracy of a test instrument, so the deterministic drift of the ADAQ4003 reduces the cost of recalibration and instrument downtime. The ADAQ4003 meets all these requirements, pushing instruments’ capability to measure lower voltage and current ranges, as well as helping optimise their control loops for different load conditions. The SMU high-level block diagram is shown in Figure 9,
with its corresponding signal chain in Figure 5. The high throughput rate enables oversampling of the
Figure 10: ADAQ4003 dynamic range, with SNR vs. oversampling rate (OSR) for various input frequencies
Application example The ADAQ4003 is a great fit for source measurement units (SMUs) and device power supplies (DPSs) for ATE – instruments used to test chips for the smartphone, 5G, automotive and IoT markets. These precision instruments have a sink/source capability, which requires a control loop for each channel that takes care of the programmed voltage and current regulation, and they demand high accuracy (especially fine linearity), speed, wide dynamic range (to measure µA/µV signal levels), monotonicity and a small size to accommodate the many channels in parallel. The ADAQ4003’s high precision combined with fast
sampling rate reduces noise, and its zero latency makes it ideal for control loop applications to provide an optimal step response and fast settling for improved test efficiency. The ADAQ4003 helps ease the design burden by eliminating buffers for distributing the reference voltage on instruments due to their own drift and for board space constraints. In addition, the drift performance and ageing determine the
ADAQ4003 to achieve the lowest rms noise and detect small amplitude signals over a wide bandwidth. Oversampling the ADAQ4003 by a factor of four provides one additional bit of resolution (only possible because the ADAQ4003 provides sufficient linearity – see Figure 8) or a 6dB increase in dynamic range; i.e., the DR improvement due to this oversampling is defined as: ΔDR = 10 × log10 (OSR), in dB. ADAQ4003’s typical dynamic range is 100dB at 2MSPS for
a 5V reference, with its inputs shorted to ground. Therefore, when the ADAQ4003 is oversampled by a factor of 1024 at an output data rate of 1.953kSPS, it offers an unbeatable dynamic range of ~130dB for a gain of 0.454 and 0.9, which can precisely detect very small amplitude µV signals. Figure 10 shows the dynamic range and SNR of ADAQ4003
for various oversampling rates and input frequencies of 1kHz and 10kHz. Figure 11 shows how μModule solutions such as the
ADAQ4003 can significantly reduce the total cost of ownership for system designers, in the different areas. It also reduced PCB assembly cost and increases manufacturing support by improving lot-to-lot yield, enabling design reuse for scaleable/modular platforms. The ADAQ4003 µModule can be used in many applications
that require precision data conversion, including automated test equipment (SMUs, DPSs), electronic test and measurement (impedance measurement), healthcare (vital sign monitoring, diagnostics, imaging), aerospace (aviation), and many industrial uses (machine automation input/output modules).
Figure 11: Reduction in total cost of ownership using signal chain µModule technology
www.electronicsworld.co.uk December/January 2023 31
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