ADS1299-4 Texas instruments

ADS1299-4

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ADS1299-4

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Описание

The ADS1299-4, ADS1299-6, and ADS1299 devices are a family of four-, six-, and eight-channel, low-noise, 24-bit, simultaneous-sampling delta-sigma (ΔΣ) analog-to-digital converters (ADCs) with a built-in programmable gain amplifier (PGA), internal reference, and an onboard oscillator. The ADS1299-x incorporates all commonly-required features for extracranial electroencephalogram (EEG) and electrocardiography (ECG) applications. With its high levels of integration and exceptional performance, the ADS1299-x enables the creation of scalable medical instrumentation systems at significantly reduced size, power, and overall cost. The ADS1299-x has a flexible input multiplexer per channel that can be independently connected to the internally-generated signals for test, temperature, and lead-off detection. Additionally, any configuration of input channels can be selected for derivation of the patient bias output signal. Optional SRB pins are available to route a common signal to multiple inputs for a referential montage configuration. The ADS1299-x operates at data rates from 250 SPS to 16 kSPS. Lead-off detection can be implemented internal to the device using an excitation current sink or source. Multiple ADS1299-4, ADS1299-6, or ADS1299 devices can be cascaded in high channel count systems in a daisy-chain configuration. The ADS1299-x is offered in a TQFP-64 package specified from –40°C to +85°C.

Up to Eight Low-Noise PGAs and Eight High-Resolution Simultaneous-Sampling ADCs
Input-Referred Noise: 1 µV_PP (70-Hz BW)
Input Bias Current: 300 pA
Data Rate: 250 SPS to 16 kSPS
CMRR: –110 dB
Programmable Gain: 1, 2, 4, 6, 8, 12, or 24
Unipolar or Bipolar Supplies:
- Analog: 4.75 V to 5.25 V
- Digital: 1.8 V to 3.6 V
Built-In Bias Drive Amplifier,
Lead-Off Detection, Test Signals
Built-In Oscillator
Internal or External Reference
Flexible Power-Down, Standby Mode
Pin-Compatible with the ADS129x
SPI-Compatible Serial Interface
Operating Temperature Range: –40°C to +85°C

Resolution (Bits)	24
Sample rate (max) (ksps)	16
Number of input channels	4
Interface type	SPI
Architecture	Delta-Sigma
Input type	Differential
Multichannel configuration	Simultaneous Sampling
Rating	Catalog
Reference mode	Ext, Int
Input voltage range (max) (V)	5.25
Input voltage range (min) (V)	0
Features	Daisy-Chainable, GPIO, Oscillator, PGA
Operating temperature range (°C)	-40 to 85
Power consumption (typ) (mW)	5
Analog supply (min) (V)	4.75
Analog supply voltage (max) (V)	5.25
SNR (dB)	121
Digital supply (min) (V)	1.8
Digital supply (max) (V)	3.6