ADS7128 Texas instruments

ADS7128

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ADS7128

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Описание

The ADS7128 is an easy-to-use, 8-channel, multiplexed, 12-bit, successive approximation register analog-to-digital converter (SAR ADC). The eight channels can be independently configured as either analog inputs, digital inputs, or digital outputs. The device has an internal oscillator for ADC conversion processes.The ADS7128 communicates via an I2C-compatible interface and operates in either autonomous or single-shot conversion mode. The ADS7128 implements analog watchdog function by event-triggered interrupts per channel using a digital window comparator with programmable high and low thresholds, hysteresis, and an event counter. The ADS7128 has a built-in cyclic redundancy check (CRC) for data read/write operations and the power-up configuration. The ADS7128 features a root-mean-square (RMS) module that computes a 16-bit true RMS result for any analog input channel. The integrated zero-crossing-detect (ZCD) module allows for transient rejection and hysteresis near the configurable threshold crossings.

Small package size:
- 3-mm × 3-mm WQFN
8 channels configurable as any combination of:
- Up to 8 analog inputs, digital inputs, or digital outputs
GPIOs for I/O expansion:
- Open-drain, push-pull digital outputs
Analog watchdog:
- Programmable thresholds per channel
- Event counter for transient rejection
Wide operating ranges:
- AVDD: 2.35 V to 5.5 V
- DVDD: 1.65 V to 5.5 V
- –40°C to +85°C temperature range
CRC for read/write operations:
- CRC on data read/write
- CRC on power-up configuration
I²C interface:
- Up to 3.4 MHz (high-speed mode)
- 8 configurable I²C addresses
Programmable averaging filters
Root-mean-square module:
- 16-bit true RMS output
- Programmable RMS time window
Zero-crossing-detect module:
- ZCD output corresponding to any analog input
- Built-in transient rejection and hysteresis
- Digitally adjustable detection threshold

Resolution (Bits)	12
Sample rate (max) (ksps)	140
Number of input channels	8
Interface type	I2C
Architecture	SAR
Input type	Single-ended
Multichannel configuration	Multiplexed
Rating	Catalog
Reference mode	Supply
Input voltage range (max) (V)	5.5
Input voltage range (min) (V)	0
Features	Comparator, GPIO, Oscillator, Small Size
Operating temperature range (°C)	-40 to 85
Power consumption (typ) (mW)	0.05
Analog supply (min) (V)	2.35
Analog supply voltage (max) (V)	5.5
SNR (dB)	69
Digital supply (min) (V)	1.65
Digital supply (max) (V)	5.5