ADS1220IPWR

Part: ADS1220 — Texas Instruments

Type: 24-Bit Delta-Sigma ADC with Integrated PGA and Reference

Description: 4-channel (two differential or four single-ended), 24-bit, up to 2 kSPS SPI ADC with PGA (gain 1–128), 2.048 V internal reference, dual excitation current sources and temperature sensor, operating from 2.3–5.5 V.

Operating Conditions:

• Supply voltage: AVDD to AVSS 2.3–5.5 V (unipolar); DVDD 2.3–5.5 V; bipolar supply ±2.3 to ±2.75 V
• Operating temperature: -40 to +125 °C
• External clock: 0.5–4.5 MHz (4.096 MHz nominal)
• Differential reference input: 0.75 V to AVDD − AVSS

Absolute Maximum Ratings:

• Max supply voltage: AVDD to AVSS and DVDD to DGND: 7 V (min -0.3 V)
• Analog input voltage: AVSS − 0.3 V to AVDD + 0.3 V
• Continuous input current (any pin except supply): ±10 mA
• Max junction temperature: 150 °C
• Storage temperature: -60 to 150 °C

Key Specs:

• Resolution: 24 bits, no missing codes
• Data rates: 20–1000 SPS normal, 5–250 SPS duty-cycle, 40–2000 SPS turbo
• INL: ±6 ppm FSR typ (gain 1–128, VCM = 0.5 AVDD); ±4 ppm FSR typ (PGA disabled, gain 1–4, differential inputs); 15 ppm FSR max
• Conditions: AVDD = DVDD = 3.3 V, PGA enabled, DR = 20 SPS, VREF = 2.5 V external
• Current consumption: as low as 120 μA typ in duty-cycle mode with PGA disabled
• Internal reference: 2.048 V, 5 ppm/°C typ drift
• Internal oscillator: 2% accuracy
• Excitation current sources: dual matched, 10 μA to 1.5 mA
• Temperature sensor accuracy: 0.5 °C typ
• Thermal resistance RθJA: 43.4 °C/W (VQFN), 99.5 °C/W (TSSOP)

Features:

• Programmable gain 1 to 128 with low-noise PGA
• Up to 20 bits effective resolution
• Simultaneous 50 Hz and 60 Hz rejection at 20 SPS with single-cycle settling filter
• Two differential or four single-ended inputs via flexible MUX
• Dual-matched programmable current sources
• Internal 2.048 V reference and internal oscillator
• Internal temperature sensor
• Low-side power switch
• SPI-compatible interface (mode 1)

Applications:

• Field transmitters (temperature, pressure, strain, flow)
• PLC and DCS analog input modules
• Patient monitoring systems (body temperature, blood pressure)
• Factory automation and process control

Package:

• RVA VQFN-16, 3.5 mm × 3.5 mm
• PW TSSOP-16, 5.0 mm × 6.4 mm

• Low current consumption:
• -As low as 120μA (typ) in duty-cycle mode
• Wide supply range: 2.3V to 5.5V
• Programmable gain: 1 to 128
• Programmable data rates: Up to 2kSPS
• Up to 20 Bits effective resolution
• Simultaneous 50Hz and 60Hz rejection at 20SPS with single-cycle settling digital filter
• Two differential or four single-ended inputs
• Dual-matched programmable current sources: -10μA to 1.5mA
• Internal 2.048V reference: 5ppm/°C (typ) drift
• Internal 2% accurate oscillator
• Internal temperature sensor:
• -0.5°C (typ) accuracy
• SPI-compatible interface (mode 1)

• Field transmitters:
• -Temperature, pressure, strain, flow
• PLC and DCS analog input modules
• Patient monitoring systems:
• -Body temperature, blood pressure
• Factory automation and process control

Figure 5-1. RVA Package, 16-Pin VQFN

Figure 5-2. PW Package, 16-Pin TSSOP

Table 5-1. Pin Functions

Table 5-1. Pin Functions

Minimum and maximum specifications apply from TA = -40°C to +125°C. Typical specifications are at TA = 25°C. All specifications are at AVDD = 3.3V, AVSS = 0V, DVDD = 3.3V, PGA enabled, DR = 20SPS, and external VREF = 2.5V (unless otherwise noted).

Minimum and maximum specifications apply from TA = -40°C to +125°C. Typical specifications are at TA = 25°C. All specifications are at AVDD = 3.3V, AVSS = 0V, DVDD = 3.3V, PGA enabled, DR = 20SPS, and external VREF = 2.5V (unless otherwise noted).

over operating ambient temperature range (unless otherwise noted) (1)

over operating ambient temperature range (unless otherwise noted)

Limited to ±[(AVDD - AVSS) - 0.4V] / Gain, when the PGA is enabled.

(3) REFPx and REFNx denote one of the two available differential reference input pairs.

The ADS1220 is a precision, 24-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 ADS1220 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.

• (1) For all available packages, see the orderable addendum at the end of the data sheet.
• (2) The package size (length × width) is a nominal value and includes pins, where applicable.

K-Type Thermocouple Measurement