Part A
ADS1148IPW
Texas Dụng cụ
- Lifecycle
- Active
- Stock
- 4234 PCS
- Series
- Data Acquisition - Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS1120IPWR and ADS1148IPW are both 16-bit delta-sigma ADCs from Texas Instruments sharing a common TSSOP-16 footprint and SPI interface, making the ADS1148IPW a viable functional replacement candidate for the ADS1120IPWR in many designs. However, the ADS1148IPW offers twice the input channel count and a wider analog supply range, while the ADS1120IPWR provides a higher programmable gain range and faster maximum data rate. Engineers should validate channel count requirements, supply rail compatibility, and gain/throughput needs before substituting.
Input Channel Count
Validation required
Package Type
High match
Analog Supply Voltage Range
Validation required
Maximum Data Rate
Validation required
Parts at a glance
Part B
ADS1120IPWR
Texas Dụng cụ
- Lifecycle
- Active
- Stock
- 5942 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 | ADS1120IPWR | ADS1148IPW | Why it matters |
|---|---|---|---|
| Resolution (bits) | 16 | 16 | Both are 16-bit delta-sigma ADCs, so nominal resolution is equivalent for precision measurement applications. |
| Number of input channels (differential) | 2 | 4 | The ADS1148 offers twice the differential input channels, enabling more sensor inputs without external multiplexing. |
| Programmable gain amplifier (PGA) gain range | 1 to 128 V/V | 1 to 128 V/V | Identical PGA gain ranges allow both parts to amplify small sensor signals similarly. |
| Data rate (max SPS) | 2000 | 2000 | Matching maximum sample rates mean comparable throughput for both devices. |
| Supply voltage (analog, V) | 2.3 to 5.5 | 2.7 to 5.5 | The ADS1120 supports a slightly lower minimum analog supply, which can matter in low-voltage systems. |
| Interface | SPI | SPI | Both use SPI, so the host microcontroller interface is compatible between the two parts. |
| Internal reference | Yes | Yes | Both integrate a reference, reducing external component count for ratiometric or absolute measurements. |
| Package | TSSOP-16 | TSSOP-28 | Different package footprints mean the two parts are not drop-in replacements on the same PCB layout. |
| Operating temperature range (°C) | -40 to 125 | -40 to 125 | Identical industrial temperature ranges suit both parts for the same environmental conditions. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1148IPW | ADS1120IPWR |
|---|---|---|
| Part Status | Active | Active |
| Base Product Number | ADS1148 | - |
| Number of Bits | 16 | 16 |
| Sampling Rate (Per Second) | 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 | - |
| Architecture | Sigma-Delta | Sigma-Delta |
| Reference Type | External, Internal | External, Internal, Supply |
| 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, Temperature Sensor |
| Operating Temperature | -40°C ~ 105°C | -40°C ~ 125°C |
| Mounting Type | Surface Mount | - |
| Packaging | Tube | - |
| Sampling Rate(Per Second) | - | 2k |
| Number of A/D Converters | - | 1 |
Frequently asked questions
What are the primary functional differences between the ADS1120IPWR and ADS1148IPW?
The ADS1120IPWR is a 16-bit, 4-channel, 2-kSPS delta-sigma ADC with an integrated PGA, voltage reference, oscillator, and SPI interface in a TSSOP-16 package. The ADS1148IPW is a 16-bit, 8-channel (4 differential/8 single-ended), 2-kSPS delta-sigma ADC with an integrated PGA, voltage reference, oscillator, and SPI interface in a TSSOP-28 package. The ADS1148IPW provides twice the input channel count and additional GPIO/IDAC features compared to the ADS1120IPWR.
Are the ADS1120IPWR and ADS1148IPW pin-to-pin or footprint compatible?
No. The ADS1120IPWR is supplied in a 16-pin TSSOP (IPW suffix) and the ADS1148IPW is supplied in a 28-pin TSSOP (IPW suffix). The package body widths differ (4.4 mm for 16-pin TSSOP vs 4.4 mm body but 28 pins), and the pin counts and pin functions are not interchangeable, so they cannot be dropped into the same PCB land pattern.
Do both devices support the same SPI interface and supply voltage range?
Yes. Both the ADS1120IPWR and ADS1148IPW use a 4-wire SPI-compatible serial interface and 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, per the respective Texas Instruments datasheets.
How do the input channel configurations compare between the two parts?
The ADS1120IPWR provides 4 single-ended or 2 differential input channels via an internal input multiplexer. The ADS1148IPW provides 8 single-ended or 4 differential input channels. Both integrate a low-noise PGA with selectable gains of 1 to 128 for the ADS1120 and 1 to 128 for the ADS1148, enabling direct connection of low-level sensors.
Do both ADCs include an internal voltage reference and oscillator?
Yes. Both the ADS1120IPWR and ADS1148IPW integrate an on-chip 2.048 V voltage reference and an internal oscillator, reducing external component count. Both also support external reference inputs for ratiometric or higher-accuracy measurements.
What are the data rate and resolution specifications for each device?
Both devices are 16-bit delta-sigma ADCs with programmable data rates up to 2 kSPS. The ADS1120IPWR supports data rates from 20 SPS to 2 kSPS, and the ADS1148IPW supports data rates from 5 SPS to 2 kSPS, per Texas Instruments datasheets.
Which device is better suited for multi-sensor or multi-channel applications?
The ADS1148IPW is better suited for higher-channel-count applications because it offers 8 single-ended or 4 differential inputs, whereas the ADS1120IPWR offers 4 single-ended or 2 differential inputs. For designs requiring more than two differential channels, the ADS1148IPW avoids the need for external multiplexing.
Are the ADS1120IPWR and ADS1148IPW interchangeable in an existing design?
No. Because the two devices differ in package pin count (16 vs 28 pins), channel count, and pinout, they are not directly interchangeable. A redesign of the PCB land pattern and firmware register map would be required to migrate between them.