Part A
ADS1220IRVAR
Texas Instruments
- Lifecycle
- Active
- Stock
- 4438 Stückzahl
- Package
- VQFN-16
- Series
- Datenerfassung mit Analog to Digital Converters (ADC)
Replacement verdict
Not a drop-in replacement
The ADS1220IRVAR and ADS1283BIRHFR are not drop-in replacements for one another. The ADS1220IRVAR is a 24-bit, 4-channel delta-sigma ADC in a 16-pin VQFN package with an SPI interface and an integrated PGA, while the ADS1283BIRHFR is a 32-bit, single-channel delta-sigma ADC in a 40-pin VQFN package with a different digital interface and no integrated PGA. Their resolution, channel count, package footprint, and interface architecture differ substantially, so a direct board-level substitution is not feasible without redesign.
Different resolution
Different channel count
Different package footprint
Different digital interface
Parts at a glance
Part B
ADS1283BIRHFR
Texas Instruments
- Lifecycle
- Active
- Stock
- 6401 Stückzahl
- Package
- VFQFN-24
- Series
- Datenerfassung mit Analog to Digital Converters (ADC)
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADS1220IRVAR | ADS1283BIRHFR | Why it matters |
|---|---|---|---|
| Resolution (bits) | 24 | 32 | Higher resolution enables finer measurement of small signal changes, which is critical for precision seismic and high-dynamic-range applications. |
| Number of input channels | 4 (2 differential / 4 single-ended) | 2 (1 differential) | Channel count determines how many sensors or signal sources can be connected without external multiplexing. |
| Maximum sample rate | 2 kSPS | 4 kSPS | Sample rate sets the bandwidth of signals that can be captured; higher rates support faster-changing inputs and wider signal bandwidth. |
| Interface type | SPI | SPI | The digital interface must match the host controller; both use SPI, but timing and register maps differ, affecting firmware compatibility. |
| Supply voltage (analog) | 2.3 V to 5.5 V | 3.0 V to 5.5 V (analog), 1.65 V to 3.6 V (digital) | Supply range determines compatibility with the system power rails and low-voltage operation capability. |
| PGA / gain stage | Integrated PGA (gain 1 to 128) | Integrated PGA (gain 1 to 64) | An integrated PGA allows direct amplification of low-level sensor signals, reducing external components and improving noise performance. |
| Package | VQFN-16 (3.5 mm x 3.5 mm) | VQFN-24 (5 mm x 4 mm) | Package footprint and pinout affect PCB layout and whether a drop-in replacement is physically possible. |
| Operating temperature range | -40 °C to +125 °C | -40 °C to +85 °C | The temperature range must cover the application environment; a narrower range may limit use in harsh or industrial conditions. |
| Typical application focus | Low-power sensor and temperature measurement | High-resolution seismic and energy exploration | The intended application domain indicates whether the part's noise, linearity, and bandwidth characteristics suit the target system. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1220IRVAR | ADS1283BIRHFR |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Active |
| Number of Bits | 24 | 31 |
| Sampling Rate(Per Second) | 2k | 128k |
| Number of Inputs | 2, 4 | 2 |
| Input Type | Differential, Single Ended | Differential |
| Data Interface | SPI | SPI |
| Configuration | MUX-PGA-ADC | MUX-PGA-ADC |
| Ratio - S / H: ADC | - | 0:1 |
| Number of A/D Converters | 1 | 1 |
| Architecture | Sigma-Delta | Sigma-Delta |
| Reference Type | External, Internal, Supply | External |
| Voltage - Supply, Analog | 2.3V ~ 5.5V, ±2.5 | 2.15V ~ 5.25V |
| Voltage - Supply, Digital | 2.3V ~ 5.5V | 1.65V ~ 3.6V |
| Features | PGA, Temperature Sensor | PGA |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 85°C |
Frequently asked questions
What are the primary differences between the ADS1220IRVAR and ADS1283BIRHFR?
The ADS1220IRVAR is a 24-bit, 4-channel, 2-kSPS delta-sigma ADC with an integrated PGA and SPI interface in a 3.5-mm × 3.5-mm VQFN-16 package, targeting general-purpose sensor measurement. The ADS1283BIRHFR is a 32-bit, single-channel, 125-SPS delta-sigma ADC with integrated PGA and digital filter in a 5-mm × 5-mm VQFN-24 package, designed for high-resolution seismic and energy-exploration data acquisition. They differ in resolution, channel count, data rate, package, and target application.
Can the ADS1220IRVAR and ADS1283BIRHFR be used interchangeably in the same design?
No. The two devices differ in resolution (24-bit vs 32-bit), channel count (4 vs 1), maximum data rate (2 kSPS vs 125 SPS), package footprint (VQFN-16 vs VQFN-24), pinout, and register map. A direct drop-in replacement is not possible; any substitution requires a full schematic, layout, and firmware redesign validated against the respective datasheets.
Which device offers higher resolution and lower noise for precision measurement?
The ADS1283BIRHFR provides 32-bit resolution and is specified for high-resolution seismic-grade measurements, while the ADS1220IRVAR provides 24-bit resolution. For applications requiring the highest dynamic range and lowest noise at low output data rates, the ADS1283BIRHFR is the higher-resolution option per its datasheet specifications.
How do the maximum output data rates of the two ADCs compare?
The ADS1220IRVAR supports output data rates up to 2 kSPS, making it suitable for moderate-speed multi-channel sensor sampling. The ADS1283BIRHFR supports output data rates up to 125 SPS, optimized for high-resolution, low-frequency measurements. The ADS1220IRVAR therefore offers a higher maximum data rate, while the ADS1283BIRHFR prioritizes resolution over speed.
Do both devices include an integrated programmable gain amplifier (PGA)?
Yes. Both the ADS1220IRVAR and ADS1283BIRHFR integrate a programmable gain amplifier to accommodate low-level sensor signals. The gain settings and input configurations differ between the two devices and must be verified in the respective datasheets before use in a given signal chain.
What are the package and pin-count differences between the ADS1220IRVAR and ADS1283BIRHFR?
The ADS1220IRVAR is supplied in a 16-pin VQFN package measuring 3.5 mm × 3.5 mm. The ADS1283BIRHFR is supplied in a 24-pin VQFN package measuring 5 mm × 5 mm. The different pin counts and footprints mean the PCB land patterns are not compatible, and layout must be redesigned when switching between them.
Which device is better suited for multi-channel sensor systems?
The ADS1220IRVAR is better suited for multi-channel systems because it provides four input channels (configurable as differential or single-ended) in a single device. The ADS1283BIRHFR is a single-channel ADC, so multi-channel systems using it require external multiplexing or multiple devices.
Are the digital interfaces of the ADS1220IRVAR and ADS1283BIRHFR compatible?
Both devices use an SPI-compatible serial interface, but their register maps, command sets, and frame formats differ. Firmware written for one device cannot be reused unchanged for the other; the interface protocol must be implemented according to each device's datasheet.