Overview
The ADS7835EB/2K5 is a 12-bit, high-speed, low-power sampling analog-to-digital converter (A/D) produced by Texas Instruments. This device is equipped with a sample-and-hold (S/H) function, an internal 2.5V reference, and a synchronous serial interface. It is designed for low power consumption, making it ideal for battery-operated systems such as wireless communication devices, portable multi-channel data loggers, and spectrum analyzers. The ADS7835EB/2K5 operates over a temperature range of –40°C to +85°C and is available in an MSOP-8 package.
Key Specifications
| Parameter | Min | Typ | Max | Units |
|---|---|---|---|---|
| Resolution | 12 | Bits | ||
| Analog Input Voltage Range | –VREF | +VREF | V | |
| Input Resistance During Conversion | 2kΩ | kΩ | ||
| Integral Linearity | ±1 | ±2 | LSB | |
| Differential Linearity | ±0.5 | ±1 | LSB | |
| Power Supply Voltage | 4.75 | 5 | 5.25 | V |
| Quiescent Current | 3.5 | mA | ||
| Power Dissipation | 17.5 | 30 | mW | |
| Power-Down Current | 0.5 | mA | ||
| Operating Temperature Range | –40 | +85 | °C |
Key Features
- 12-bit resolution with no missing codes.
- High-speed conversion rate up to 500kHz.
- Low power consumption: 17.5mW at 500kHz throughput, and 2.5mW in power-down mode.
- Internal 2.5V reference with the option to use an external reference (2.3V to 2.9V).
- Synchronous serial interface for data transfer.
- True bipolar input range of ±2.5V.
- Small MSOP-8 package.
- Operating temperature range of –40°C to +85°C.
Applications
- Battery-operated systems.
- Wireless communication devices.
- Portable multi-channel data loggers.
- Spectrum analyzers.
- Remote data acquisition systems requiring low-cost isolation.
Q & A
- What is the resolution of the ADS7835EB/2K5?
The ADS7835EB/2K5 has a 12-bit resolution.
- What is the typical power consumption of the ADS7835EB/2K5 at 500kHz throughput?
The typical power consumption is 17.5mW at 500kHz throughput.
- Can the ADS7835EB/2K5 be powered down to reduce power consumption?
Yes, the device can be placed into a power-down mode which reduces power dissipation to 2.5mW.
- What is the input voltage range of the ADS7835EB/2K5 when using the internal reference?
The input voltage range is ±2.5V when using the internal 2.5V reference.
- Can the ADS7835EB/2K5 use an external reference voltage?
Yes, the device can operate with an external reference voltage in the range of 2.3V to 2.9V.
- What is the operating temperature range of the ADS7835EB/2K5?
The operating temperature range is –40°C to +85°C.
- What package type is the ADS7835EB/2K5 available in?
The device is available in an MSOP-8 package.
- How does the ADS7835EB/2K5 handle bipolar inputs?
The device provides a true bipolar input where the input can swing below ground, and it uses a 2kΩ x 2kΩ voltage divider to accept bipolar inputs while operating from a single 5V supply.
- What is the maximum clock frequency for the ADS7835EB/2K5?
The maximum clock frequency is 8MHz, which corresponds to a 500kHz conversion rate.
- How is the digital result of the conversion provided?
The digital result is provided in a serial manner, synchronous to the CLK input, with the most significant bit first. It is possible to obtain the result least significant bit first by controlling the CONV and CLK inputs.
