ADC0848BCVX/NOPB vs ADS7842EG4
| Part Number |
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| Category | Data Acquisition - Analog to Digital Converters (ADC) | Data Acquisition - Analog to Digital Converters (ADC) |
| Manufacturer | National Semiconductor | Texas Instruments |
| Description | IC ADC 8BIT SAR 28PLCC | IC ADC 12BIT SAR 28SSOP |
| Package | Bulk | Tape & Reel (TR) |
| Series | - | - |
| Features | - | Selectable Address |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
| Package / Case | 28-LCC (J-Lead) | 28-SSOP (0.209\", 5.30mm Width) |
| Supplier Device Package | 28-PLCC (11.51x11.51) | 28-SSOP |
| Reference Type | External | External |
| Sampling Rate (Per Second) | 25k | 200k |
| Data Interface | Parallel | Parallel |
| Number of Bits | 8 | 12 |
| Voltage - Supply, Analog | 4.5V ~ 6V | 2.7V ~ 3.6V, 5V |
| Voltage - Supply, Digital | 4.5V ~ 6V | 2.7V ~ 3.6V, 5V |
| Number of Inputs | 4, 8 | 4 |
| Input Type | Differential, Pseudo-Differential, Single Ended | Single Ended |
| Configuration | MUX-ADC | MUX-S/H-ADC |
| Ratio - S/H:ADC | - | 1:1 |
| Number of A/D Converters | 1 | 1 |
| Architecture | SAR | SAR |
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1. How does ADC convert analog to digital?
The technology that converts analog sound signals into digital signals is called analog-to-digital conversion technology (Analog to Digital Converter, referred to as ADC). The function of ADC is to convert continuously changing analog signals into discrete digital signals. The process of analog-to-digital conversion can be completed by steps such as sampling, holding, quantization, and encoding.
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2. How many types of ADC are there?
The types of ADC (Analog-to-Digital Converter) mainly include:
1. Integral ADC: Its working principle is to convert the input voltage into time (pulse width signal) or frequency (pulse frequency), and then obtain the digital value by the timer/counter. The advantage of the integral ADC is that it can obtain high resolution with a simple circuit and has strong anti-interference ability, but the disadvantage is that the conversion rate is extremely low because the conversion accuracy depends on the integration time.
2. Successive approximation type (SAR ADC): The successive approximation ADC is one of the most common architectures. Its basic principle is to convert by gradually approximating the value of the analog input signal. The advantages of the successive approximation ADC are high speed and low power consumption. It is cheap at low resolution, but expensive at high precision.
3. Parallel comparison type/serial-parallel comparison type ADC: The parallel comparison type AD uses m -
3. How to convert analog to digital without ADC?
Analog to digital conversion without ADC can be achieved through PWM circuit. This method is suitable for those main control chips without built-in ADC, which needs to be solved by two GPIOs and an operational amplifier. The basic principle is to use an integral circuit to convert the PWM wave into a smooth DC voltage, and then continuously adjust the PWM duty cycle by comparing it with the voltage to be measured until the output of the comparator changes from 0 to 1, and record the current PWM duty cycle, thereby realizing the measurement of the analog voltage.
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4. When is ADC used?
ADC (Analog-to-Digital Converter) is widely used in a variety of scenarios, including but not limited to:
Sensor interface: For example, temperature sensors, pressure sensors, and light sensors, ADC converts analog voltages into digital signals for the use of digital thermometers, temperature control systems, barometers, air pressure sensing systems, light intensity detection and control systems.
Audio signal processing: In microphones, ADC converts analog audio signals into digital signals for digital audio processing, recording, and playback.
Medical equipment: Such as electrocardiograms (ECGs) and oximeters, ADC converts analog signals of ECG signals and blood oxygen saturation into digital signals for heart health monitoring and diagnosis and blood oxygen level monitoring.
Data acquisition system: In various applications that need to collect data from analog signals, ADC is used to convert analog signals into digital signals for storage, processing, and analysis.
