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.
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| Part number | Order | Resolution (Bits) | Sample rate (Max) (kSPS) | Number of input channels | Interface | Operating temperature range (C) | Package Group | Power consumption (Typ) (mW) | Package size: mm2:W x L (PKG) | Architecture | Input type | Multi-channel configuration | Reference mode | Features | Input range (Max) (V) | Input range (Min) (V) | Analog voltage AVDD (Min) (V) | Analog voltage AVDD (Max) (V) | Digital supply (Min) (V) | Digital supply (Max) (V) | INL (Max) (+/-LSB) | SNR (dB) | THD (Typ) (dB) | Rating |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ADS1278-SP |
|
24 | 128 | 8 | SPI |
-55 to 115
-55 to 125 25 to 25 |
CFP | 84 | 530 | 84CFP: 190 mm2: 13.8 x 13.8 (CFP | 84) | Delta-Sigma | Differential | Simultaneous Sampling | Ext | Daisy-Chainable | 5.25 | 0 | 4.75 | 5.25 | 1.65 | 2.2 | 201.4 | 111 | -108 | Space |
| ADC128S102QML-SP | Samples not available | 12 | 1000 | 8 |
Microwire (Serial I/O)
QSPI SPI |
-55 to 125
25 to 25 |
CFP | 16 | 2.3 | 16CFP: 63 mm2: 6.35 x 9.906 (CFP | 16) | SAR | Single-Ended | Multiplexed | Supply | 5.25 | 0 | 2.7 | 5.25 | 2.7 | 5.25 | 1.1 | 72 | -87 | Space | |
| ADS1282-SP | Samples not available | 31 | 4 | 2 | SPI |
-55 to 115
-55 to 125 25 to 25 |
CFP | 28 | 25 | 28CFP: 232 mm2: 12.7 x 18.23 (CFP | 28) | Delta-Sigma | Differential | Multiplexed | Ext | PGA |
1.15
3.75 |
-1.9
0.7 |
4.75 | 5.25 | 1.65 | 3.6 | 17179.9 | 130 | -122 | Space |