ADS1120
The ADS1120 is an electronic component from Texas Instruments. View the full ADS1120 datasheet below including key specifications, electrical characteristics, absolute maximum ratings.
Official ADS1120 datasheet (PDF) — the source this page was extracted from.
Manufacturer
Texas InstrumentsADS1120 Key Specifications
| Parameter | Value |
|---|---|
| Resolution | 16-bit |
| Noise-Free Resolution | 16-Bit at 20 SPS |
| Data Rates | Up to 2 kSPS |
| Programmable Gain | 1 V/V to 128 V/V |
| Current Consumption | As low as 120 μA (typ) in Duty-Cycle Mode |
| Internal Reference | 2.048-V, 5 ppm/°C (typ) Drift |
| Internal Temperature Sensor | 0.5°C (typ) Accuracy |
ADS1120 Overview
Part: ADS1120 — Texas Instruments
Type: 16-Bit Analog-to-Digital Converter (ADC)
Description: A precision, 16-bit, 4-channel analog-to-digital converter with integrated PGA and reference, offering a 2.3–5.5 V supply range, up to 2 kSPS data rates, and 120 μA (typ) current consumption in duty-cycle mode.
Operating Conditions:
- Supply voltage: 2.3 V to 5.5 V
- Operating temperature: -40°C to +125°C
- Data rates: Up to 2 kSPS
- Programmable Gain: 1 V/V to 128 V/V
Key Specs:
- Resolution: 16-bit
- Noise-Free Resolution: 16-Bit at 20 SPS
- Data Rates: Up to 2 kSPS
- Programmable Gain: 1 V/V to 128 V/V
- Current Consumption: As low as 120 μA (typ) in Duty-Cycle Mode
- Internal Reference: 2.048-V, 5 ppm/°C (typ) Drift
- Internal Temperature Sensor: 0.5°C (typ) Accuracy
- Input Channels: Two Differential or Four Single-Ended
Features:
- Low Current Consumption: As Low as 120 μA (typ) in Duty-Cycle Mode
- Wide Supply Range: 2.3 V to 5.5 V
- Programmable Gain: 1 V/V to 128 V/V
- Programmable Data Rates: Up to 2 kSPS
- 16-Bit Noise-Free Resolution at 20 SPS
- Simultaneous 50-Hz and 60-Hz Rejection at 20 SPS with Single-Cycle Settling Digital Filter
- Two Differential or Four Single-Ended Inputs
- Dual-Matched Programmable Current Sources: 50 μA to 1.5 mA
- Internal 2.048-V Reference: 5 ppm/°C (typ) Drift
- Internal 2% Accurate Oscillator
- Internal Temperature Sensor: 0.5°C (typ) Accuracy
- SPI-Compatible Interface (Mode 1)
- Package: 3.5-mm × 3.5-mm × 0.9-mm VQFN
Applications:
- Temperature Sensor Measurements:
- Thermistors
- Thermocouples
- Resistance Temperature Detectors (RTDs): 2-, 3-, or 4-Wire Types
- Resistive Bridge Sensor Measurements:
- Pressure Sensors
- Strain Gauges
- Weigh Scales
- Portable Instrumentation
- Factory Automation and Process Controls
Package:
- VQFN (16)
- TSSOP (16)
ADS1120 Features
- 1 · Low Current Consumption: As Low as 120 μ A (typ) in Duty-Cycle Mode
- Wide Supply Range: 2.3 V to 5.5 V
- Programmable Gain: 1 V/V to 128 V/V
- Programmable Data Rates: Up to 2 kSPS
- 16-Bit Noise-Free Resolution at 20 SPS
- Simultaneous 50-Hz and 60-Hz Rejection at 20 SPS with Single-Cycle Settling Digital Filter
- Two Differential or Four Single-Ended Inputs
- Dual-Matched Programmable Current Sources: 50 μ A to 1.5 mA
- Internal 2.048-V Reference: 5 ppm/°C (typ) Drift
- Internal 2% Accurate Oscillator
- Internal Temperature Sensor: 0.5°C (typ) Accuracy
- SPI-Compatible Interface (Mode 1)
- Package: 3.5-mm × 3.5-mm × 0.9-mm VQFN
ADS1120 Applications
- Temperature Sensor Measurements:
- -Thermistors
- -Thermocouples
- -Resistance Temperature Detectors (RTDs): 2-, 3-, or 4-Wire Types
- Resistive Bridge Sensor Measurements:
- -Pressure Sensors
- -Strain Gauges
- -Weigh Scales
- Portable Instrumentation
- Factory Automation and Process Controls
ADS1120 Pin Configuration
ADS1120 Electrical Characteristics
Minimum and maximum specifications apply from TA = -40°C to +125°C. Typical specifications are at TA = 25°C. All specifications are at AVDD = 3.3 V, AVSS = 0 V, DVDD = 3.3 V, PGA enabled, DR = 20 SPS, and external Vref = 2.5 V (unless otherwise noted). (1)
| PARAMETER | TEST CONDITIONS | MIN | TYP | MAX | UNIT | |
|---|---|---|---|---|---|---|
| ANALOG INPUTS | ANALOG INPUTS Absolute input current Differential input current | ANALOG INPUTS | ANALOG INPUTS See the Typical Characteristics See the Typical Characteristics | ANALOG INPUTS See the Typical Characteristics See the Typical Characteristics | ANALOG INPUTS | ANALOG INPUTS |
| SYSTEM PERFORMANCE | SYSTEM PERFORMANCE Resolution (no missing codes) | SYSTEM PERFORMANCE Normal mode | SYSTEM PERFORMANCE 16 20, 45, 90, 175, 330, 600, 1000 | SYSTEM PERFORMANCE 20, 45, 90, 175, 330, 600, 1000 | SYSTEM PERFORMANCE | SYSTEM PERFORMANCE Bits |
| DR | Data rate Noise (input-referred) | Duty-cycle mode Turbo mode | 5, 11.25, 22.5, 44, 82.5, 150, 250 40, 90, 180, 350, 660, 1200, 2000 See the Noise Performance section | 5, 11.25, 22.5, 44, 82.5, 150, 250 40, 90, 180, 350, 660, 1200, 2000 See the Noise Performance section | SPS | |
| INL | Integral nonlinearity | Gain = 1 to 128, V CM = 0.5 AVDD, best fit (2) | 8 | 20 | ppm FSR | |
| V | PGA disabled, gain = 1 to 4, differential inputs | ±4 | ||||
| IO | Input offset voltage | Gain = 1 to 128, differential inputs PGA disabled, gain = 1 to 4 | ±4 0.25 | μV | ||
| Offset drift Gain error | Gain = 1 to 128, T A = -40°C to +85°C (2) Gain = 1 to 128 PGA disabled, gain = 1 to 4 | 0.08 0.25 ±0.015% | 0.3 | μV/°C | ||
| Gain = 1 to 128, T A = 25°C PGA disabled, gain = 1 to 4 | -0.1% | ±0.015% 1 | 0.1% | |||
| Gain drift | Gain = 1 to 128 (2) 50 Hz ±3%, DR = 20 SPS, external CLK, 50/60 bit = 10 | 105 | 1 | 4 | ppm/°C | |
| NMRR | Normal-mode rejection ratio (2) Common-mode rejection ratio | 60 Hz ±3%, DR = 20 SPS, external CLK, 50/60 bit = 11 50 Hz or 60 Hz ±3%, DR = 20 SPS, external CLK, 50/60 bit = 01 At dc, gain = 1 | 105 90 90 | 105 | dB dB | |
| CMRR | f (CM) = 50 Hz, DR = 2000 SPS (2) f (CM) = 60 Hz, DR = 2000 SPS (2) | 95 95 | 115 115 | |||
| PSRR | Power-supply rejection ratio | AVDD at dc, V CM = 0.5 AVDD, gain = 1 DVDD at dc, V CM = 0.5 AVDD, gain = 1 (2) | 80 100 | 105 115 | dB | |
| INTERNAL VOLTAGE REFERENCE | INTERNAL VOLTAGE REFERENCE | INTERNAL VOLTAGE REFERENCE | INTERNAL VOLTAGE REFERENCE | INTERNAL VOLTAGE REFERENCE | INTERNAL VOLTAGE REFERENCE | INTERNAL VOLTAGE REFERENCE |
| Initial accuracy | T A = 25°C | 2.045 | 2.048 | 2.051 | V | |
| Reference drift (2) | 5 | 40 | ppm/°C | |||
| Long-term drift | 1000 hours | 110 | ppm | |||
| VOLTAGE REFERENCE INPUTS | VOLTAGE REFERENCE INPUTS | VOLTAGE REFERENCE INPUTS | VOLTAGE REFERENCE INPUTS | VOLTAGE REFERENCE INPUTS | VOLTAGE REFERENCE INPUTS | VOLTAGE REFERENCE INPUTS |
| Reference input current | REFP0 = V ref , REFN0 = AVSS | ±10 | nA | |||
| INTERNAL OSCILLATOR | INTERNAL OSCILLATOR | INTERNAL OSCILLATOR | INTERNAL OSCILLATOR | INTERNAL OSCILLATOR | INTERNAL OSCILLATOR | INTERNAL OSCILLATOR |
| Internal oscillator accuracy | Normal mode | -2% | ±1% | 2% |
ADS1120 Absolute Maximum Ratings
| MIN | MAX | UNIT | ||
|---|---|---|---|---|
| Power-supply voltage | AVDD to AVSS | -0.3 | 7 | V |
| Power-supply voltage | DVDD to DGND | -0.3 | 7 | V |
| Power-supply voltage | AVSS to DGND | -2.8 | 0.3 | V |
| Analog input voltage | AIN0/REFP1, AIN1, AIN2, AIN3/REFN1, REFP0, REFN0 | AVSS - 0.3 | AVDD + 0.3 | V |
| Digital input voltage | CS, SCLK, DIN, DOUT/DRDY, DRDY, CLK | DGND - 0.3 | DVDD + 0.3 | V |
| Input current | Continuous, any pin except power supply pins | -10 | 10 | mA |
| Temperature | Junction, T J | -40 | 150 | °C |
| Temperature | Storage, T stg | -60 | 150 | °C |
ADS1120 Recommended Operating Conditions
over operating ambient temperature range (unless otherwise noted)
| MIN | NOM | MAX | UNIT | |||
|---|---|---|---|---|---|---|
| POWER SUPPLY | POWER SUPPLY | POWER SUPPLY | POWER SUPPLY | POWER SUPPLY | POWER SUPPLY | POWER SUPPLY |
| Unipolar analog power supply | AVDD to AVSS | 2.3 | 5.5 | V | ||
| AVSS to DGND | -0.1 | 0 | 0.1 | V | ||
| Bipolar analog power supply | AVDD to DGND | 2.3 | 2.5 | 2.75 | V | |
| AVSS to DGND | -2.75 | -2.5 | -2.3 | V | ||
| Digital power supply | DVDD to DGND | 2.3 | 5.5 | V | ||
| ANALOG INPUTS (1) | ANALOG INPUTS (1) | ANALOG INPUTS (1) | ANALOG INPUTS (1) | ANALOG INPUTS (1) | ANALOG INPUTS (1) | ANALOG INPUTS (1) |
| V IN | Differential input voltage | V IN = V (AINP) - V (AINN) (2) | -V ref / Gain | V ref / Gain | V | |
| V (AINx) | Absolute input voltage | PGA disabled, gain = 1 to 4 | AVSS - 0.1 | AVDD + 0.1 | V | |
| V (AINx) | PGA enabled, gain = 1 to 128 | See the Low-Noise PGA section | See the Low-Noise PGA section | See the Low-Noise PGA section | See the Low-Noise PGA section | |
| V CM | Common-mode input voltage | PGA disabled, gain = 1 to 4 | AVSS - 0.1 | AVDD + 0.1 | V | |
| V CM | PGA enabled, gain = 1 to 128 | See the Low-Noise PGA section | See the Low-Noise PGA section | See the Low-Noise PGA section | ||
| VOLTAGE REFERENCE INPUTS (3) | VOLTAGE REFERENCE INPUTS (3) | VOLTAGE REFERENCE INPUTS (3) | VOLTAGE REFERENCE INPUTS (3) | VOLTAGE REFERENCE INPUTS (3) | VOLTAGE REFERENCE INPUTS (3) | VOLTAGE REFERENCE INPUTS (3) |
| V ref | Differential reference input voltage | V ref = V (REFPx) - V (REFNx) | 0.75 | 2.5 | AVDD | V |
| V (REFNx) | Absolute negative reference voltage | AVSS - 0.1 | V (REFPx) - 0.75 | V | ||
| V (REFPx) | Absolute positive reference voltage | V (REFNx) + 0.75 | AVDD + 0.1 | V | ||
| EXTERNAL CLOCK SOURCE | EXTERNAL CLOCK SOURCE | EXTERNAL CLOCK SOURCE | EXTERNAL CLOCK SOURCE | EXTERNAL CLOCK SOURCE | EXTERNAL CLOCK SOURCE | EXTERNAL CLOCK SOURCE |
| f (CLK) | External clock frequency Duty cycle | 0.5 40% | 4.096 | 4.5 60% | MHz | |
| DIGITAL INPUTS | DIGITAL INPUTS | DIGITAL INPUTS | DIGITAL INPUTS | DIGITAL INPUTS | DIGITAL INPUTS | DIGITAL INPUTS |
| Input | voltage | DGND | DVDD | V | ||
| TEMPERATURE RANGE | TEMPERATURE RANGE | TEMPERATURE RANGE | TEMPERATURE RANGE | TEMPERATURE RANGE | TEMPERATURE RANGE | TEMPERATURE RANGE |
| T A | Operating ambient temperature | -40 | 125 | °C |
ADS1120 Thermal Information
| ADS1120 | ADS1120 | ||
|---|---|---|---|
| THERMAL METRIC | (1) | VQFN (RVA) | TSSOP (PW) |
| 16 PINS | 16 PINS | ||
| R θ JA | Junction-to-ambient thermal resistance | 43.4 | 99.5 |
| R θ JC(top) | Junction-to-case (top) thermal resistance | 47.3 | 35.2 |
| R θ JB | Junction-to-board thermal resistance | 18.4 | 44.3 |
| ψ JT | Junction-to-top characterization parameter | 0.6 | 2.4 |
| ψ JB | Junction-to-board characterization parameter | 18.4 | 43.8 |
| R θ JC(bot) | Junction-to-case (bottom) thermal resistance | 2.0 | n/a |
ADS1120 Typical Application
The ADS1120 is a precision, 16-bit, ΔΣ ADC that offers many integrated features to ease the measurement of the most common sensor types including various types of temperature and bridge sensors. Primary considerations when designing an application with the ADS1120 include analog input filtering, establishing an appropriate external reference for ratiometric measurements, and setting the common-mode input voltage for the internal PGA. Connecting and configuring the serial interface appropriately is another concern. These considerations are discussed in the following sections.
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