Overview
The ADS7955-Q1, produced by Texas Instruments, is a 10-bit, 8-channel, single-ended analog-to-digital converter (ADC) designed for high-performance and low-power applications. This device is particularly suitable for battery-powered systems, medical instrumentation, and automotive applications due to its MicroPower consumption and robust specifications. The ADS7955-Q1 features a capacitor-based successive approximation register (SAR) A/D converter with inherent sample and hold, ensuring zero latency and a high sample rate of 1 MSPS.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Resolution | 10-bit | |
| Sample Rate | 1 MSPS | |
| Number of Channels | 8 | |
| Analog Supply Range | 2.7 to 5.25 V | V |
| I/O Supply Range | 1.7 to 5.25 V | V |
| Input Ranges | 0 to 2.5 V, 0 to 5 V | V |
| Serial Interface Speed | 20 MHz | |
| Power Dissipation (typical) | 14.5 mW (+VA = 5 V, +VBD = 3 V) at 1 MSPS | mW |
| Power-Down Current | 1 μA | μA |
| Input Bandwidth | 47 MHz at 3 dB | MHz |
| Package Type | 30-Pin TSSOP |
Key Features
- Zero Latency: Ensures that the conversion process starts immediately with the falling edge of the chip select (CS) signal.
- High-Speed Serial Interface: Operates at up to 20 MHz, facilitating fast data transfer.
- Low Power Consumption: Suitable for battery-powered systems with a typical power dissipation of 14.5 mW at 1 MSPS.
- Flexible Input Ranges: Two software-selectable input ranges (0 to 2.5 V and 0 to 5 V) to accommodate various signal levels.
- Programmable GPIOs: Four individually configurable general-purpose input/output pins available in the TSSOP package.
- Alarm Thresholds: Two programmable alarm levels per channel for monitoring critical signal levels.
- Auto and Manual Channel Selection: Supports both automatic sequencing and manual selection of channels for conversion.
- Power-Down Feature: Extremely low power-down current of 1 μA, ideal for power-saving in idle states.
Applications
- Battery-Powered Systems: Ideal for devices that require low power consumption to extend battery life.
- Medical Instrumentation: Suitable for medical devices due to its high accuracy and low noise characteristics.
- Automotive Applications: Qualified for automotive use, making it reliable for various automotive systems.
- Data Acquisition Systems: Used in data acquisition applications requiring multiple channels and high sample rates.
- Industrial Control Systems: Applicable in industrial environments where precise and reliable data conversion is necessary.
Q & A
- What is the resolution of the ADS7955-Q1 ADC?
The ADS7955-Q1 has a 10-bit resolution.
- What is the maximum sample rate of the ADS7955-Q1?
The maximum sample rate is 1 MSPS (1 million samples per second).
- How many channels does the ADS7955-Q1 support?
The device supports 8 single-ended channels.
- What is the range of the analog supply voltage for the ADS7955-Q1?
The analog supply range is from 2.7 V to 5.25 V.
- What is the speed of the serial interface of the ADS7955-Q1?
The serial interface operates at up to 20 MHz.
- How much power does the ADS7955-Q1 typically consume at 1 MSPS?
The typical power dissipation is 14.5 mW at 1 MSPS with +VA = 5 V and +VBD = 3 V.
- What is the power-down current of the ADS7955-Q1?
The power-down current is 1 μA.
- What are the input ranges available for the ADS7955-Q1?
The device has two software-selectable input ranges: 0 to 2.5 V and 0 to 5 V.
- Does the ADS7955-Q1 support programmable GPIOs?
Yes, it has four individually configurable general-purpose input/output pins in the TSSOP package.
- Can the ADS7955-Q1 be used in automotive applications?
Yes, the device is qualified for automotive applications.
