ADS1284
Ultra-high-resolution 4-kSPS 2-ch ADC w/ PGA and low-power mode for seismic and geospace exploration
ADS1284
- Selectable Operating Modes
- Low-Power Mode:
- 12 mW (PGA = 1, 2, 4 and 8)
- 127 dB SNR (250 SPS, PGA = 1)
- High-Resolution Mode:
- 18 mW (PGA = 1, 2, 4 and 8)
- 130 dB SNR (250 SPS, PGA = 1)
- THD: –122 dB
- CMRR: 110 dB
- Two-Channel Multiplexer
- Inherently-Stable Modulator
- Fast Responding Overrange Detector
- Flexible Digital Filter:
- Sinc + FIR + IIR (Selectable)
- Linear or Minimum Phase Option
- Programmable High-Pass Filter
- Offset and Gain Calibration
- SYNC Input
- Analog Supply: 5 V or ±2.5 V
- Digital Supply: 1.8 V to 3.3 V
The ADS1284 is a high-performance, single-chip, analog-to-digital converter (ADC). This device includes a low-noise programmable gain amplifier (PGA), delta-sigma (ΔΣ) modulator, and digital filter. The ADC supports two modes of operation with trade-offs between power and resolution.
The two-channel multiplexer has the inputs for signal measurement and an ADC signal test. A mode is available to short circuit the inputs and test for internal noise. The PGA has the high input impedance and low noise, which provides for the direct connection of geophone and hydrophone sensors.
The fourth-order, inherently stable modulator provides outstanding noise and linearity performance. The modulator output is filtered and decimated by the on-chip digital filter to yield the ADC conversion result.
The digital filter provides data rates from 250 to 4000 SPS. The high-pass filter (HPF) has a programmable corner frequency. On-chip gain and offset scale registers support system calibration.
The synchronization input controls the timing of the ADC conversion. The power-down input puts the ADC into power-down mode.
The ADS1284 is available in a compact 24-lead, 5-mm × 4-mm VQFN package, and is fully specified from –40°C to +85°C, with a maximum operating temperature range of –50°C to +125°C.
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Technical documentation
Type | Title | Date | ||
---|---|---|---|---|
* | Data sheet | ADS1284 High-Resolution, Analog-to-Digital Converter datasheet (Rev. A) | PDF | HTML | 27 Aug 2019 |
Application note | Calculating Conversion Latency and System Cycle Time for Delta-Sigma ADCs (Rev. A) | PDF | HTML | 18 Mar 2024 | |
Application note | Digital Filter Types in Delta-Sigma ADCs (Rev. A) | PDF | HTML | 29 Mar 2023 | |
E-book | Fundamentals of Precision ADC Noise Analysis | 19 Jun 2020 |
Design & development
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ANALOG-ENGINEER-CALC — PC software analog engineer's calculator
The analog engineer’s calculator is designed to speed up many of the repetitive calculations that analog circuit design engineers use on a regular basis. This PC-based tool provides a graphical interface with a list of various common calculations ranging from setting operational-amplifier (...)
Supported products & hardware
Products
Precision op amps (Vos<1mV)
General-purpose op amps
Audio op amps
Transimpedance amplifiers
High-speed op amps (GBW ≥ 50 MHz)
Power op amps
Video amplifiers
Line drivers
Transconductance amplifiers & laser drivers
Fully differential amplifiers
Precision ADCs
Biosensing AFEs
High-speed ADCs (≥10 MSPS)
Receivers
Touchscreen controllers
Difference amplifiers
Instrumentation amplifiers
Audio line receivers
Analog current-sense amplifiers
Digital power monitors
Analog current-sense amplifiers with integrated shunt resistor
Digital power monitors with integrated shunt resistor
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PSPICE-FOR-TI — PSpice® for TI design and simulation tool
TINA-TI — SPICE-based analog simulation program
Package | Pins | CAD symbols, footprints & 3D models |
---|---|---|
VQFN (RHF) | 24 | Ultra Librarian |
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