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ADS1278IPAPR-ADS1278IPAPT
Octal, 144kHz, Simultaneous Sampling 24-Bit Delta Sigma ADC
SPI
IOVDD
DRDY/FSYNC
SCLK
DOUT[8:1]
DIN
ADS1274
ADS1278
www.ti.com SBAS367F –JUNE 2007–REVISED FEBRUARY 2011
Quad/Octal, Simultaneous Sampling, 24-Bit Analog-to-Digital Converters
Checkfor Samples: ADS1274, ADS1278
1FEATURES DESCRIPTION
234• Simultaneously Measure Four/Eight Channels Basedon the single-channel ADS1271, the ADS1274
(quad) and ADS1278 (octal) are 24-bit, delta-sigma•
Upto 144kSPS Data Rate(ΔΣ) analog-to-digital converters (ADCs) with data•
AC Performance: ratesupto 144k samples per second (SPS), allowing
70kHz Bandwidth simultaneous samplingof fouror eight channels. The
111dB SNR (High-Resolution Mode) devices are offeredin identical packages, permitting–108dB
THD drop-in expandability.
DC Accuracy: Traditionally, industrial delta-sigma ADCs offering
0.8μV/°C Offset Drift good drift performance use digital filters with large
1.3ppm/°C Gain Drift passband droop. Asa result, they have limited signal
Selectable Operating Modes: bandwidth and are mostly suited for dc
High-Speed: 144kSPS, 106dB SNR measurements. High-resolution ADCs in audio
applications offer larger usable bandwidths, but the
High-Resolution: 52kSPS, 111dB SNRoffset and drift specifications are significantly weaker
Low-Power: 52kSPS, 31mW/ch than respective industrial counterparts. The ADS1274
Low-Speed: 10kSPS, 7mW/ch and ADS1278 combine these typesof converters,•
Linear Phase Digital Filter allowing high-precision industrial measurement with•
SPI™or Frame-Sync Serial Interface excellentdc andac specifications.
Low Sampling Aperture Error The high-order, chopper-stabilized modulator
Modulator Output Option (digital filter bypass) achieves very low drift with low in-band noise. The
onboard decimation filter suppresses modulator and•
Analog Supply: 5V signal out-of-band noise. These ADCs providea•
Digital Core: 1.8V usable signal bandwidth upto 90%of the Nyquist•
I/O Supply: 1.8Vto 3.3V rate with less than 0.005dBof ripple.
Four operating modes allowfor optimizationof speed,
APPLICATIONS resolution, and power. All operations are controlled•
Vibration/Modal Analysis directly by pins; there are no registersto program.
Multi-Channel Data Acquisition The devices are fully specified over the extended
industrial range (–40°Cto +105°C) and are available•
Acoustics/Dynamic Strain Gauges inan HTQFP-64 PowerPAD™ package.
