Overview
The ADS7861E/2K5 is a high-speed, low-power, dual 12-bit Analog-to-Digital Converter (ADC) produced by Texas Instruments. This device operates from a single +5V supply and features four fully differential input channels grouped into two pairs, enabling simultaneous sampling and conversion of two channels. The ADCs are based on the Successive Approximation Register (SAR) architecture and include two differential sample-and-hold amplifiers. The internal reference voltage is +2.5V, but the device can also operate with an external reference in the range of 1.2V to 2.6V. The ADS7861E/2K5 is designed for high-speed applications, achieving a maximum throughput rate of 500kSPS with a master clock set at 8MHz.
Key Specifications
| Specification | Value |
|---|---|
| Resolution | 12-bit |
| Sampling Rate | Up to 500kSPS |
| Input Channels | 4 (grouped into 2 pairs) |
| Input Type | Fully differential |
| Internal Reference Voltage | +2.5V |
| External Reference Voltage Range | 1.2V to 2.6V |
| Supply Voltage | +5V |
| Operating Temperature Range | -40°C to +125°C |
| Sample-and-Hold Bandwidth | Greater than the Nyquist rate (typical small-signal bandwidth: 40MHz) |
| Aperture Delay Time | Typically 50ps (aperture jitter) |
| Data Interface | SPI |
| Package Type | 24-SSOP/QSOP |
Key Features
- High-Speed Operation: Achieves a maximum throughput rate of 500kSPS with a master clock set at 8MHz.
- Simultaneous Sampling: Allows simultaneous sampling and conversion of two channels, preserving the relative phase information of the signals.
- Fully Differential Inputs: The device features four fully differential input channels, which can be driven in either single-ended or differential configurations.
- Internal and External Reference: Includes an internal +2.5V reference and supports an external reference in the range of 1.2V to 2.6V.
- Low Power Consumption: Designed for low power operation, making it suitable for battery-powered and power-sensitive applications.
- High Common-Mode Rejection: Typical common-mode rejection of 80dB.
- Flexible Operation Modes: Can operate in two-channel or four-channel modes, with configurable serial data output options.
Applications
- Industrial Automation: Suitable for high-speed data acquisition in industrial control systems.
- Medical Devices: Used in medical imaging and diagnostic equipment requiring high-speed and low-noise ADCs.
- Aerospace and Defense: Applicable in various military and aerospace applications where high-speed and reliable data conversion is critical.
- Test and Measurement: Ideal for use in oscilloscopes, signal analyzers, and other test equipment.
- Automotive Systems: Used in automotive sensors and control systems that require high-speed data acquisition.
Q & A
- What is the resolution of the ADS7861E/2K5 ADC?
The ADS7861E/2K5 has a 12-bit resolution.
- What is the maximum sampling rate of the ADS7861E/2K5?
The maximum sampling rate is up to 500kSPS.
- How many input channels does the ADS7861E/2K5 have?
The device has four fully differential input channels grouped into two pairs.
- What is the internal reference voltage of the ADS7861E/2K5?
The internal reference voltage is +2.5V.
- Can the ADS7861E/2K5 use an external reference voltage?
Yes, it supports an external reference voltage in the range of 1.2V to 2.6V.
- What is the supply voltage for the ADS7861E/2K5?
The supply voltage is +5V.
- What is the operating temperature range of the ADS7861E/2K5?
The operating temperature range is -40°C to +125°C.
- What is the typical small-signal bandwidth of the sample-and-hold amplifiers?
The typical small-signal bandwidth is 40MHz.
- What is the aperture delay time (aperture jitter) of the ADS7861E/2K5?
The aperture delay time is typically 50ps (aperture jitter).
- What data interface does the ADS7861E/2K5 use?
The device uses an SPI interface.
