Part A
ADS1248IPW
Texas Instruments
- Lifecycle
- Active
- Stock
- 2446 PCS
- Package
- TSSOP-28
- Series
- Acquisition de données - Convertisseur analogique - numérique (ADC)
Replacement verdict
Not a drop-in replacement
The ADS1219IPWR and ADS1248IPW are not drop-in replacements for one another. Although both are 24-bit delta-sigma ADCs, they differ in resolution architecture, input channel configuration, package footprint, and reference/supply requirements, so a direct board-level substitution is not feasible without redesign.
Different channel count
Different package footprint
Different input configuration
Different reference architecture
Parts at a glance
Part B
ADS1219IPWR
Texas Instruments
- Lifecycle
- Active
- Stock
- 5923 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 | ADS1219IPWR | ADS1248IPW | Why it matters |
|---|---|---|---|
| Resolution (bits) | 24 | 24 | Both are 24-bit delta-sigma ADCs, so resolution alone does not differentiate them for substitutability. |
| Number of input channels | 4 (single-ended) / 2 (differential) | 8 (single-ended) / 4 (differential) | Channel count determines how many sensors or signals can be measured; the ADS1248 supports twice as many inputs. |
| PGA gain stages | 1 to 128 | 1 to 128 | Programmable gain allows small signals to be amplified; both offer the same gain range. |
| Maximum data rate (SPS) | 1000 | 2000 | Higher throughput enables faster sampling; the ADS1248 can sample up to twice as fast. |
| Interface | I2C | SPI | The digital interface must match the host microcontroller; I2C and SPI are not directly interchangeable without redesign. |
| Internal reference | Yes (2.048 V) | Yes (2.048 V) | An internal reference simplifies design and improves accuracy; both integrate a 2.048 V reference. |
| Supply voltage (analog) | 2.7 V to 5.5 V | 2.7 V to 5.25 V | Supply range affects compatibility with system rails; the ADS1219 tolerates a slightly higher maximum analog supply. |
| Package | TSSOP-16 | TSSOP-28 | Footprint and pin count differ, so a board redesign is required to substitute one for the other. |
| Operating temperature range | -40 °C to +125 °C | -40 °C to +105 °C | The wider temperature range of the ADS1219 suits harsher environments. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1248IPW | ADS1219IPWR |
|---|---|---|
| Part Status | Active | Active |
| Number of Bits | 24 | 24 |
| Sampling Rate(Per Second) | 2k | 1k |
| Number of Inputs | 4, 7 | 4 |
| Input Type | Differential, Single Ended | Differential, Single Ended |
| Data Interface | SPI | I²C |
| Configuration | MUX-PGA-ADC | MUX-ADC |
| Number of A/D Converters | 1 | 1 |
| Architecture | Sigma-Delta | Sigma-Delta |
| Reference Type | External, Internal | External, Internal |
| Voltage - Supply, Analog | 2.7V ~ 5.25V | 2.3V ~ 5.5V |
| Voltage - Supply, Digital | 2.7V ~ 5.25V | 2.3V ~ 5.5V |
| Features | PGA, Temperature Sensor | PGA |
| Operating Temperature | -40°C ~ 105°C | -40°C ~ 125°C |
| Ratio - S / H: ADC | - | 0:1 |
Frequently asked questions
What are the primary differences between the ADS1219IPWR and ADS1248IPW?
The ADS1219IPWR is a 4-channel, 24-bit delta-sigma ADC with a fixed gain of 1 and an I2C interface, housed in a TSSOP-16 package. The ADS1248IPW is an 8-channel (4 differential), 24-bit delta-sigma ADC with a programmable gain amplifier (PGA) from 1 to 128, an SPI interface, and an integrated excitation current source, housed in a TSSOP-28 package.
Are the ADS1219IPWR and ADS1248IPW pin-to-pin or package compatible?
No. The ADS1219IPWR uses a 16-pin TSSOP package, while the ADS1248IPW uses a 28-pin TSSOP package. They have different pin counts, pin functions, and PCB land patterns, so they are not drop-in replacements for each other.
Do these ADCs use the same digital communication interface?
No. The ADS1219IPWR communicates via an I2C interface, whereas the ADS1248IPW uses an SPI-compatible interface. The host microcontroller firmware and bus wiring must be designed accordingly for each device.
How do the input channel counts and PGA capabilities compare?
The ADS1219IPWR provides 4 single-ended or 2 differential inputs with a fixed gain of 1. The ADS1248IPW provides 8 single-ended or 4 differential inputs and includes a programmable gain amplifier selectable from 1 to 128, making it better suited for low-level sensor signals.
Does the ADS1248IPW include sensor excitation features that the ADS1219IPWR lacks?
Yes. The ADS1248IPW integrates two matched programmable excitation current sources (typically used for RTD and thermistor measurements), while the ADS1219IPWR does not include built-in excitation current sources.
What are the supply voltage requirements for each device?
Both devices operate from an analog supply (AVDD) of 2.7 V to 5.25 V and a digital supply (DVDD) of 2.7 V to 5.25 V, per their respective manufacturer datasheets. Designers should verify the exact recommended operating conditions in the latest datasheet revision.
Which device is more suitable for multi-channel RTD or thermocouple systems?
The ADS1248IPW is generally more suitable for multi-channel RTD or thermocouple systems because it offers 4 differential inputs, a PGA up to 128, and integrated excitation current sources. The ADS1219IPWR, with 2 differential inputs and fixed gain, suits simpler, lower-channel-count precision measurement designs.