Part A
ADS1148IPW
Texas Dụng cụ
- Lifecycle
- Active
- Stock
- 4234 PCS
- Series
- Data Acquisition - Analog to Digital Converters (ADC)
Replacement verdict
Not a drop-in replacement
The ADS1119IPWR and ADS1148IPW are not drop-in replacements for one another. Although both are 16-bit delta-sigma ADCs in TSSOP packages, they differ in resolution architecture, input channel configuration, interface protocol, and reference/supply requirements, so a direct substitution is not feasible without redesign.
Different input channel count
Different interface protocol
Different data rate capability
Different reference architecture
Parts at a glance
Part B
ADS1119IPWR
Texas Dụng cụ
- Lifecycle
- Active
- Stock
- 6293 PCS
- Package
- TSSOP-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 | ADS1119IPWR | ADS1148IPW | Why it matters |
|---|---|---|---|
| Resolution (bits) | 16 | 16 | Both are 16-bit ADCs, so resolution is equivalent and not a differentiator for substitutability. |
| Number of input channels | 4 (2 differential / 4 single-ended) | 8 (4 differential / 8 single-ended) | The ADS1148 offers twice the channel count, which matters if the application needs to monitor more sensor inputs. |
| Maximum sample rate (SPS) | 1000 | 2000 | A higher sample rate supports faster-changing signals; the ADS1148 can sample twice as fast. |
| Interface | I2C | SPI | The digital interface must match the host MCU; I2C versus SPI is a fundamental compatibility difference. |
| Programmable gain amplifier (PGA) | Yes (1 to 128 V/V) | Yes (1 to 128 V/V) | Both integrate a PGA with the same gain range, allowing direct connection of small-amplitude sensors. |
| Internal reference | Yes (2.048 V) | Yes (2.048 V) | An internal reference simplifies design and improves accuracy; both provide a 2.048 V reference. |
| Supply voltage (analog) | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Matching analog supply ranges allow both parts to operate from the same system rail. |
| Package | TSSOP-16 | TSSOP-28 | Different package footprints and pin counts mean the PCB layout cannot be shared without redesign. |
| Operating temperature range | -40 °C to +125 °C | -40 °C to +105 °C | The ADS1119 supports a wider upper temperature limit, which matters for harsh-environment applications. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1148IPW | ADS1119IPWR |
|---|---|---|
| Part Status | Active | Active |
| Base Product Number | ADS1148 | - |
| Number of Bits | 16 | 16 |
| Sampling Rate (Per Second) | 2k | - |
| 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 | - |
| 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 | PGA |
| Operating Temperature | -40°C ~ 105°C | -40°C ~ 125°C |
| Mounting Type | Surface Mount | - |
| Packaging | Tube | - |
| Sampling Rate(Per Second) | - | 1k |
| Ratio - S / H: ADC | - | 0:1 |
| Number of A/D Converters | - | 1 |
Frequently asked questions
What are the key architectural differences between the ADS1119IPWR and ADS1148IPW?
The ADS1119IPWR is a 4-channel, 16-bit delta-sigma ADC with an integrated PGA, operating from a single 2.3 V to 5.5 V supply, housed in a TSSOP-16 package. The ADS1148IPW is a 8-channel (4 differential), 16-bit delta-sigma ADC with an integrated PGA and excitation current sources, operating from a 2.7 V to 5.25 V analog supply and 2.7 V to 5.25 V digital supply, housed in a TSSOP-28 package. The ADS1148IPW provides more input channels and includes burnout detection and excitation current sources intended for RTD/temperature sensing, while the ADS1119IPWR offers a smaller footprint and lower minimum supply voltage.
Are the ADS1119IPWR and ADS1148IPW pin-compatible?
No. The ADS1119IPWR is supplied in a 16-pin TSSOP (PW) package, while the ADS1148IPW is supplied in a 28-pin TSSOP (PW) package. The differing pin counts and pin functions mean the two devices are not pin-compatible and cannot be interchanged on the same PCB land pattern without redesign.
How do the input channel configurations compare between the two devices?
The ADS1119IPWR provides 4 single-ended or 2 differential input channels. The ADS1148IPW provides 8 single-ended or 4 differential input channels. Designs requiring more than two differential inputs must use the ADS1148IPW or an external multiplexer.
Do both devices include a programmable gain amplifier (PGA)?
Yes. Both the ADS1119IPWR and ADS1148IPW integrate a programmable gain amplifier. The ADS1119IPWR PGA supports gains of 1, 2, 4, 8, 16, 32, 64, and 128. The ADS1148IPW PGA supports gains of 1, 2, 4, 8, 16, 32, 64, and 128 as well. Gain settings should be verified against the respective datasheet for the specific configuration and data rate used.
How do the supply voltage requirements differ?
The ADS1119IPWR operates from a single analog supply of 2.3 V to 5.5 V. The ADS1148IPW requires 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. Systems operating below 2.7 V must use the ADS1119IPWR, while the ADS1148IPW requires at least 2.7 V on both rails.
Which device is better suited for RTD or thermocouple temperature measurement?
The ADS1148IPW is specifically designed for temperature sensor applications, as it integrates two matched excitation current sources (IDACs) for RTD excitation, a bias voltage generator, and burnout detection, along with 4 differential inputs. The ADS1119IPWR does not integrate excitation current sources, so RTD excitation must be provided externally. For multi-sensor temperature systems, the ADS1148IPW reduces external component count.
What are the data rate capabilities of each device?
The ADS1119IPWR supports programmable data rates from 20 SPS to 1000 SPS. The ADS1148IPW supports programmable data rates from 5 SPS to 2000 SPS. The ADS1148IPW offers a wider data rate range, including lower rates for higher-resolution noise performance and higher rates for faster throughput.
Do both devices support a serial interface, and what type?
Yes. Both devices use an SPI-compatible serial interface. The ADS1119IPWR supports SPI mode 1 with a 4-wire interface (CS, SCLK, DIN, DOUT) plus a DRDY output. The ADS1148IPW supports SPI with 4-wire interface (CS, SCLK, DIN, DOUT) plus DRDY. The exact timing and mode requirements should be confirmed in each datasheet before designing the host interface.
Can the ADS1119IPWR directly replace the ADS1148IPW in an existing design?
No. The devices differ in package pin count (16 vs 28 pins), channel count (4 vs 8 single-ended), supply voltage range, integrated excitation current sources, and data rate range. A direct drop-in replacement is not possible; any substitution requires PCB redesign and firmware changes validated against the respective datasheets.