The circuit shown in Figure 1 represents a highly integrated, 16-bit, 1 MSPS, multiplexed, 8-channel digital acquisition system (DAS) with an embedded programmable gain instrumentation amplifier (PGIA). This system is designed to handle a wide range of industrial-grade signals efficiently. Powered by a single +5 V supply, the circuit utilizes a high-efficiency, low-ripple boost converter that generates ±15 V, enabling it to process differential input signals up to ±24.576 V (with ±2 LSB INL maximum and ±0.5 LSB DNL typical). For precision applications, this compact and cost-effective solution delivers high accuracy and minimal noise. The system integrates a successive approximation register (SAR) ADC with a true high-impedance differential input buffer, eliminating the need for additional buffering. This design helps reduce the "recoil" effect often seen in SAR ADCs based on capacitive DACs. Additionally, the circuit features strong common-mode rejection, which removes the necessity for an external instrumentation amplifier—commonly used in systems where common-mode signals are prevalent. The ADAS3022 is a complete 16-bit, 1 MSPS data acquisition system that includes an 8-channel low-leakage multiplexer, a programmable gain instrumentation amplifier with high common-mode rejection, and a precision low-drift 4.096 V reference voltage source along with a reference buffer. It also incorporates a high-performance, delay-free 16-bit SAR ADC. The ADAS3022 reduces power consumption during idle periods, making its operating current and power linearly proportional to the throughput. This makes it ideal for battery-powered applications with low sampling rates. The ADAS3022 supports eight input channels plus one COM input, which can be configured as eight single-ended channels, eight channels referenced to the same voltage, four differential channels, or a combination of both. In the circuit shown in Figure 1, the ADR434 low-noise reference voltage is buffered by the AD8031 op amp, ensuring stable and accurate reference levels. The AD8031 is capable of driving dynamic loads quickly, making it well-suited for use as a reference buffer. The ADP1613 is a DC-DC boost converter with an integrated power switch that supplies the ADAS3022 with an on-chip input multiplexer and a ±15 V high-voltage power supply for the PGIA without degrading performance. This circuit combines the ADAS3022, ADP1613, ADR434, and AD8031 to deliver both high accuracy and low noise performance. The complete DAS on a single chip can operate at up to 1 MSPS and accept differential analog input signals up to ±24.576 V. The device requires a bipolar high-voltage supply: ±15 V (VDDH and VSSH), +5 V (AVDD and DVDD), and +1.8 V to +5 V (VIO). The ADAS3022 simplifies the design of precision 16-bit, 1 MSPS DAS by eliminating the need for signal buffering, level shifting, amplification, and noise suppression typically required in standard solutions. It offers improved timing and noise performance at higher data rates, reduced size, faster time-to-market, and lower costs. The ADAS3022 integrates a PGIA that allows gains of 0.16, 0.2, 0.4, 0.8, 1.6, 3.2, and 6.4, and it can handle fully differential input ranges of ±24.576 V, ±20.48 V, ±10.24 V, ±5.12 V, ±2.56 V, ±1.28 V, and ±0.64 V. The input range is referenced to the internal 4.096 V reference. It measures pseudo-differential, unipolar, and bipolar input ranges relative to the voltage on the COM pin. In the circuit shown in Figure 1, the external reference is provided by the 4.096 V ADR434, which features high accuracy, low power consumption (800 μA operating current), low noise, ±0.12% maximum initial error, and excellent temperature stability. The AD8032 low-power op amps are used to buffer external reference voltages and are ideal for battery-powered systems requiring high bandwidth and high-speed systems with high component density and low power requirements. The ADAS3022's digital interface includes asynchronous inputs (CNV, RESET, PD, and BUSY) and a 4-wire serial interface (CS, SDO, SCK, and DIN), compatible with SPI, FPGA, or DSP for reading back conversion results and configuration registers.
Battery Holders Retainer Clips
What is Battery Holder?
Battery Holders are devices used to hold and secure batteries in electronic devices. They come in various shapes and sizes, depending on the type and size of the battery they are designed to hold. Battery holders are typically made from plastic or metal materials and feature spring-loaded contacts that connect to the battery terminals to provide power to the device. They are commonly used in electronic devices such as toys, remote controls, flashlights, and other portable devices that require batteries for power. Battery holders are essential components in electronic devices, as they ensure that the batteries are held securely in place and provide a reliable source of power for the device.
Choosing the right Battery Holder.
The kind of battery holder required depends on the below factors:
Size of the batteries being used (AAA, AA, C, D, etc.)
Number of cells being used
Compatibility of the cells being used with the battery holder
Contact and terminal style
Most battery holders are specifically manufactured for a particular type of batteries. However, many battery holders will be compatible with similar batteries with different chemistries. One point to note here is that if a battery holder houses batteries of different chemistries at the same time, the power being delivered will be in line with the weakest battery. Hence, using batteries with the same chemistry is advisable for optimum performance.
Types of Battery Holder Mounts.
The way the battery holder is attached to the cell-powered device is known as the battery holder mount. The different types of battery mounts are:
Panel Mount:
A panel mount battery holder is a separate compartment designed to hold cells. It can be inserted into a cavity in the device that needs power. It can be removed when the batteries need to be changed. They are inserted in the device cavity by screwing in or have Flange Panels.
Slide-In Mount:
In this type of mount, the cells are inserted and removed by sliding in or out. They are the most commonly used mounts and also economical. When a cell is slid in place, it is held by a cover or by the opposing force of two terminals. This type of mount is quite reliable, too.
Chassis Mount:
This type of mount is fixed inside the main body of the device to a surface plate. These mounts come in plastic as well as metal.
PCB Mount:
As the name suggests, the PCB Mount is for when the battery needs to be on a PCB. It has sharp pins around the perimeter which can be used to fix it on a PCB. Usually, they are used to hold coin cells. However, PCB mounts are also made for AAA or AA cells.
Strap & Lead:
They are not entire housing units, but make it possible to attach a battery to an electronic device or holder. It just has a wire and two press studs to hold a cell. Replacement of the cell becomes easy in this method.
Snap-In Mount:
It consists of tensioned metal clips to hold a cell securely in place. The battery is to be pushed into the housing until it snaps in place. This type of mount is best suited for systems prone to shocks and vibrations.
Wire Lead Mount:
This type of mount provides a good level of flexibility in terms of the places where it can be used. It has two wire leads at one end while the other end can be fixed to the device being powered.
Surface Mount:
This type of mount is usually used for coin cells. It lies flat inside the device or within a circuit. It is open-faced and has button terminal contacts.
Through-Hole Surface Mount:
This is best suited to hold batteries where space is a constraint. Instead of being inserted into a cavity in a device, it is fixed on the surface of the device through holes.
Battery holders are often not taken seriously enough when designing systems. However, a reliable battery holder is an important component that contributes to the reliability of the entire system.
Battery Hoders, Battery Case, Battery Socket, Battery Clips, Coin Cell Battery Holder
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