Part A
ADS1283IRHFR
Texas Dụng cụ
- Lifecycle
- Active
- Stock
- 58 PCS
- Series
- Data Acquisition - Analog to Digital Converters (ADC)
Replacement verdict
Not a drop-in replacement
The ADS1220IRVAR and ADS1283IRHFR are both precision delta-sigma ADCs, but they differ fundamentally in resolution, channel architecture, package footprint, and target application class. The ADS1220IRVAR is a 24-bit, 4-channel multiplexed ADC in a compact VQFN package aimed at general-purpose sensor measurement, while the ADS1283IRHFR is a 31-bit, single-channel ADC in a larger VQFN package optimized for high-resolution seismic and energy exploration data acquisition. Because resolution, channel count, package, and interface characteristics do not align, the ADS1283IRHFR cannot be treated as a drop-in substitute for the ADS1220IRVAR without significant redesign.
Different resolution class
Different channel count
Different package footprint
Different application target
Parts at a glance
Part B
ADS1220IRVAR
Texas Dụng cụ
- Lifecycle
- Active
- Stock
- 4438 PCS
- Package
- VQFN-16
- Series
- Data Acquisition - 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 | ADS1283IRHFR | 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 can be interfaced without external multiplexing, affecting system complexity and board space. |
| 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. |
| Input type | Differential / single-ended (multiplexed) | Differential | Differential-only inputs offer better common-mode noise rejection, while multiplexed single-ended inputs provide flexibility for multiple sensors. |
| PGA gain range | 1 to 128 V/V | 1 to 64 V/V | Programmable gain amplifies small sensor signals before conversion; the available gain range affects the minimum resolvable input signal. |
| Supply voltage (analog) | 2.3 V to 5.5 V | 5 V (single 5 V analog supply) | Supply voltage compatibility determines whether the part can operate directly from the system rail or requires additional regulation. |
| Interface | SPI | SPI | Both use SPI, so the host microcontroller interface is compatible, but timing and register maps differ and require firmware changes. |
| Package | VQFN-16 (3.5 mm x 3.5 mm) | VQFN-24 (5 mm x 5 mm) | Package footprint and pin count affect PCB layout, thermal performance, and whether a drop-in replacement is possible. |
| Operating temperature range | -40 °C to +125 °C | -40 °C to +85 °C | The temperature range determines suitability for harsh or industrial environments and derating requirements. |
| Typical application focus | Low-power sensor and bridge measurements | High-resolution seismic and energy exploration | The intended application domain indicates the noise, linearity, and dynamic-range tradeoffs optimized in each device. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1283IRHFR | ADS1220IRVAR |
|---|---|---|
| Part Status | Active | Active |
| Number of Bits | 31 | 24 |
| Sampling Rate (Per Second) | 128k | - |
| Number of Inputs | 2 | 2, 4 |
| Input Type | Differential | Differential, Single Ended |
| Data Interface | SPI | SPI |
| Configuration | MUX-PGA-ADC | MUX-PGA-ADC |
| Ratio - S / H: ADC | 0:1 | - |
| Number of A / D Converters | 1 | - |
| Architecture | Sigma-Delta | Sigma-Delta |
| Reference Type | External | External, Internal, Supply |
| Voltage - Supply, Analog | 2.15V ~ 5.25V | 2.3V ~ 5.5V, ±2.5 |
| Voltage - Supply, Digital | 1.65V ~ 3.6V | 2.3V ~ 5.5V |
| Features | PGA | PGA, Temperature Sensor |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 125°C |
| Mounting Type | Surface Mount | - |
| Base Product Number | ADS1283 | - |
| Sampling Rate(Per Second) | - | 2k |
| Number of A/D Converters | - | 1 |
Frequently asked questions
What are the primary differences between the ADS1220IRVAR and ADS1283IRHFR?
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 ADS1283IRHFR is a 32-bit, single-channel, 125-SPS delta-sigma ADC with integrated PGA and digital filter, housed in a 5-mm × 5-mm VQFN-24 package, designed for high-resolution seismic and energy exploration applications. They differ in resolution, channel count, data rate, package, and target application.
Can the ADS1220IRVAR and ADS1283IRHFR be used interchangeably in the same design?
No. The two devices have different package footprints (VQFN-16 vs VQFN-24), different pinouts, different supply and interface requirements, and different resolution and data-rate capabilities. A direct drop-in replacement is not possible; any substitution would require a PCB redesign and full revalidation against the respective datasheets.
What are the resolution and data-rate specifications of each device?
The ADS1220IRVAR provides 24-bit resolution with programmable data rates up to 2 kSPS. The ADS1283IRHFR provides 32-bit resolution with a maximum data rate of 125 SPS. The ADS1283 offers higher resolution at lower throughput, while the ADS1220 offers higher throughput at 24-bit resolution.
How do the input channel configurations compare?
The ADS1220IRVAR offers 4 single-ended or 2 differential input channels with an integrated PGA. The ADS1283IRHFR is a single-channel device with an integrated PGA. Designs requiring multiple sensor inputs would favor the ADS1220, while single-channel high-resolution acquisition would favor the ADS1283.
Do both devices include an integrated PGA and what gain ranges are supported?
Yes, both integrate a programmable gain amplifier. The ADS1220IRVAR PGA supports gains from 1 to 128. The ADS1283IRHFR PGA supports gains of 1, 2, 4, 8, 16, 32, and 64. Exact gain and input-range limits should be confirmed in the respective manufacturer datasheets.
What digital interfaces and supply voltages do these ADCs use?
Both devices use an SPI-compatible serial interface. The ADS1220IRVAR operates from an analog supply of 2.7 V to 5.5 V and a digital supply of 2.7 V to 5.5 V. The ADS1283IRHFR uses a 5-V analog supply and a 3.3-V digital supply (with separate AVDD, DVDD, and IOVDD rails). Designers should verify exact rail tolerances in the datasheets.
Which device is better suited for seismic or high-resolution precision measurement?
The ADS1283IRHFR is specifically designed for seismic and energy exploration data acquisition, offering 32-bit resolution and low-noise performance at up to 125 SPS. The ADS1220IRVAR is a general-purpose 24-bit ADC suited to multi-channel sensor and industrial measurement. For seismic-grade resolution, the ADS1283 is the appropriate choice.
Are the package and pin configurations compatible for layout reuse?
No. The ADS1220IRVAR uses a 16-pin VQFN (RVA) package, while the ADS1283IRHFR uses a 24-pin VQFN (RHF) package. Pin counts, pin functions, and land patterns differ, so a common PCB layout cannot accommodate both without redesign.