Part A
ADS1248IPW
Texas Instruments
- Lifecycle
- Active
- Stock
- 2446 PCS
- Package
- TSSOP-28
- Series
- Acquisition de données - Convertisseur analogique - numérique (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS1220IPWR and ADS1248IPW are both 24-bit delta-sigma ADCs from Texas Instruments sharing a TSSOP-16 footprint and similar supply architecture, making the ADS1220IPWR a viable functional replacement candidate for the ADS1248IPW in many precision sensor measurement applications. However, the ADS1220IPWR offers fewer input channels and a lower programmable data rate ceiling, so designs requiring the ADS1248IPW's higher channel count or faster maximum output rate must be validated before substitution.
Input Channel Count
Validation required
Package Type
High match
Resolution
High match
Maximum Data Rate
Validation required
Parts at a glance
Part B
ADS1220IPWR
Texas Instruments
- Lifecycle
- Active
- Stock
- 6260 PCS
- Package
- TSSOP-16
- Series
- Acquisition de données - Convertisseur analogique - numérique (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 | ADS1220IPWR | ADS1248IPW | Why it matters |
|---|---|---|---|
| Resolution (bits) | 24 | 24 | Both are 24-bit delta-sigma ADCs, so resolution is equivalent for high-precision sensing applications. |
| Number of input channels (differential) | 2 | 4 | The ADS1248 supports twice as many differential inputs, enabling more sensor channels without external multiplexing. |
| Programmable gain amplifier (PGA) range | 1 to 128 V/V | 1 to 128 V/V | Identical PGA gain range allows both to amplify small sensor signals such as thermocouples and RTDs similarly. |
| Data rate (max SPS) | 2000 | 2000 | Equal maximum output data rate supports comparable sampling throughput for both devices. |
| Internal oscillator | Yes | Yes | Both integrate an internal oscillator, reducing external component count and board space. |
| Supply voltage (analog) | 2.3 V to 5.5 V | 2.7 V to 5.25 V | The ADS1220 supports a slightly wider and lower supply range, which can matter for low-voltage or battery-powered designs. |
| Interface | SPI | SPI | Both use SPI, so the same host microcontroller interface can be reused across designs. |
| Package | TSSOP-16 | TSSOP-28 | Different package footprints mean the two parts are not drop-in PCB replacements and require layout changes. |
| Operating temperature range | -40 °C to +125 °C | -40 °C to +105 °C | The ADS1220 offers a higher maximum operating temperature, which can be important for harsh-environment applications. |
| Integrated features | PGA, internal reference, internal oscillator, IDAC | PGA, internal reference, internal oscillator, IDAC, GPIO | The ADS1248 adds GPIO pins, providing extra control lines, while both share core signal-chain integration features. |
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 | ADS1248IPW | ADS1220IPWR |
|---|---|---|
| Part Status | Active | Active |
| Number of Bits | 24 | 24 |
| Sampling Rate(Per Second) | 2k | 2k |
| Number of Inputs | 4, 7 | 2, 4 |
| Input Type | Differential, Single Ended | Differential, Single Ended |
| Data Interface | SPI | SPI |
| Configuration | MUX-PGA-ADC | MUX-PGA-ADC |
| Number of A/D Converters | 1 | 1 |
| Architecture | Sigma-Delta | Sigma-Delta |
| Reference Type | External, Internal | External, Internal, Supply |
| Voltage - Supply, Analog | 2.7V ~ 5.25V | 2.3V ~ 5.5V, ±2.5 |
| Voltage - Supply, Digital | 2.7V ~ 5.25V | 2.3V ~ 5.5V |
| Features | PGA, Temperature Sensor | PGA, Temperature Sensor |
| Operating Temperature | -40°C ~ 105°C | -40°C ~ 125°C |
Frequently asked questions
What are the key architectural differences between the ADS1220IPWR and ADS1248IPW?
The ADS1220IPWR is a 24-bit, 4-channel delta-sigma ADC with a single programmable gain amplifier stage and integrated 2.048-V reference, housed in a TSSOP-16 package. The ADS1248IPW is a 24-bit, 8-channel (4 differential) delta-sigma ADC with a PGA, two matched programmable excitation current sources, and an internal 2.048-V reference, housed in a TSSOP-28 package. The ADS1248 provides more input channels and dedicated excitation current sources for RTD/sensor excitation, while the ADS1220 offers a smaller footprint and lower channel count.
Are the ADS1220IPWR and ADS1248IPW pin-to-pin compatible?
No. The ADS1220IPWR uses a 16-pin TSSOP package, while the ADS1248IPW uses a 28-pin TSSOP package. The pin counts, pin functions, and PCB land patterns differ, so they cannot be dropped into the same footprint without a board redesign.
How do the input channel configurations compare between the two devices?
The ADS1220IPWR provides 4 single-ended or 2 differential input channels through an input multiplexer. The ADS1248IPW provides 8 single-ended or 4 differential input channels. Designs requiring more than two differential inputs should use the ADS1248IPW, while the ADS1220IPWR suits lower-channel-count sensor interfaces.
Do both devices include programmable excitation current sources for sensor excitation?
The ADS1248IPW integrates two matched programmable excitation current sources (0.5 mA to 2 mA) intended for RTD and thermistor excitation. The ADS1220IPWR does not include dedicated excitation current sources; external excitation circuitry is required for resistive sensor measurements.
What are the data output rates supported by each ADC?
The ADS1220IPWR supports programmable data rates from 5 SPS to 2000 SPS in normal mode, with lower rates available in duty-cycle and turbo modes per the datasheet. The ADS1248IPW supports programmable data rates from 5 SPS to 2000 SPS. Both devices allow trade-offs between resolution and throughput via register configuration.
How do the supply voltage and reference options compare?
Both devices operate from an analog supply (AVDD) of 2.7 V to 5.5 V and a digital supply (DVDD) of 2.7 V to 5.5 V, and both include an internal 2.048-V reference. The ADS1220IPWR additionally supports a dedicated analog supply range with an internal reference and external reference options. The ADS1248IPW provides an internal 2.048-V reference plus external reference inputs and a reference monitor. Consult the respective datasheets for exact reference voltage ranges and configurations.
Which device is better suited for multi-channel RTD or thermocouple systems?
The ADS1248IPW is generally better suited for multi-channel RTD systems because it offers 4 differential inputs and two matched programmable excitation current sources, reducing external circuitry. The ADS1220IPWR is better suited for compact, lower-channel designs such as single- or dual-sensor interfaces where external excitation is acceptable.
Can the ADS1220IPWR directly replace the ADS1248IPW in an existing design?
No. Direct replacement is not possible due to differing package pin counts (16 vs 28 pins), different input channel counts, and the absence of integrated excitation current sources on the ADS1220IPWR. A redesign of the PCB and validation against the target application requirements would be necessary.