ADS1278-SP Texas instruments

ADS1278-SP

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ADS1278-SP

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Описание

The ADS1278-SP (octal) is a 24-bit, delta-sigma (ΔΣ) analog-to-digital converter (ADC) with data rates up to 128k samples per second (SPS), allowing simultaneous sampling of eight channels. Traditionally, industrial delta-sigma ADCs offering good drift performance use digital filters with large passband droop. As a result, they have limited signal bandwidth and are mostly suited for dc measurements. High-resolution ADCs in audio applications offer larger usable bandwidths, but the offset and drift specifications are significantly weaker than respective industrial counterparts. The ADS1278-SP combines these types of converters, allowing high-precision industrial measurement with excellent dc and ac specifications.The high-order, chopper-stabilized modulator achieves very low drift with low in-band noise. The onboard decimation filter suppresses modulator and signal out-of-band noise. These ADCs provide a usable signal bandwidth up to 90% of the Nyquist rate with less than 0.005 dB of ripple.Four operating modes allow for optimization of speed, resolution, and power. All operations are controlled directly by pins; there are no registers to program. The device is fully specified over the extended temperature range of –55°C to 125°C and is available in an 84-pin HFQ package.

Radiation Hardened
- TID 75 krad(Si)
- TID Radiation Lot Acceptance Test (RLAT) TBD
- Single Event Latchup (SEL) Immune to LET 68 MeV-cm²/mg @ 125°C
Simultaneously Samples Eight Channels
Up to 128-kSPS Data Rate
AC Performance:
- 63-kHz Bandwidth
- 111-dB SNR (High-Resolution Mode)
- –108-dB THD
DC Accuracy:
- 0.8-µV/°C Offset Drift
- 1.3-ppm/°C Gain Drift
Selectable Operating Modes:
- High-Speed: 128 kSPS, 106-dB SNR
- High-Resolution: 52 kSPS, 111-dB SNR
- Low-Power: 52 kSPS, 31 mW/ch
- Low-Speed: 10 kSPS, 7 mW/ch
Linear Phase Digital Filter
SPI™ or Frame-Sync Serial Interface
Low Sampling Aperture Error
Modulator Output Option (Digital Filter Bypass)
Analog Supply: 5 V
Digital Core: 1.8 V
I/O Supply: 1.8 V to 3.3 V

Resolution (Bits)	24
Sample rate (max) (ksps)	128
Number of input channels	8
Interface type	SPI
Architecture	Delta-Sigma
Input type	Differential
Multichannel configuration	Simultaneous Sampling
Rating	Space
Reference mode	External
Input voltage range (max) (V)	5.25
Input voltage range (min) (V)	0
Features	Daisy-Chainable
Operating temperature range (°C)	-55 to 115, -55 to 125, 25 to 25
Power consumption (typ) (mW)	530
Analog supply (min) (V)	4.75
Analog supply voltage (max) (V)	5.25
SNR (dB)	111
Digital supply (min) (V)	1.65
Digital supply (max) (V)	2.2