Part A
ADS1146IPWR
STマイクロエレクトロニクス
- Lifecycle
- Active
- Stock
- 3513 個数
- Package
- TSSOP-16
- Series
- データ取得 - アナログ/デジタルコンバータ (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS1120IPWR and ADS1146IPWR share the same TSSOP-16 package, 2.0 V to 5.5 V analog supply range, and SPI interface, making them viable functional replacement candidates in space-constrained designs. However, the ADS1120IPWR integrates a PGA, dual IDAC current sources, and a 2.048 V reference, while the ADS1146IPWR provides a single differential input without these integrated features. Engineers must validate input configuration, reference architecture, and excitation requirements against the target application before substituting one device for the other.
Package Type
High match
Supply Voltage Range
High match
Input Channel Configuration
Validation required
Integrated Analog Features
Not compatible
Parts at a glance
Part B
ADS1120IPWR
STマイクロエレクトロニクス
- Lifecycle
- Active
- Stock
- 5942 個数
- Package
- TSSOP-16
- Series
- データ取得 - アナログ/デジタルコンバータ (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 | ADS1146IPWR | 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 | 1 | The ADS1120 supports two differential inputs (4 single-ended), while the ADS1146 supports one differential input, affecting how many sensors can be measured without external multiplexing. |
| Input multiplexer (MUX) | Yes (integrated 4:1 MUX) | No (single differential input) | An integrated MUX allows switching between multiple signal sources; its absence in the ADS1146 limits multi-channel flexibility. |
| Programmable gain amplifier (PGA) | Yes (gains 1 to 128) | Yes (gains 1 to 128) | Both include a PGA to amplify small sensor signals, enabling direct interfacing with low-level outputs such as thermocouples and RTDs. |
| Data rate (max SPS) | 2000 | 2000 | Maximum throughput is the same, so both suit similar sampling-speed requirements. |
| Internal oscillator | Yes | Yes | An internal oscillator simplifies design by removing the need for an external clock source in both parts. |
| Internal reference | Yes | Yes | An integrated voltage reference reduces external component count and board space for both devices. |
| Supply voltage (analog) | 2.3 V to 5.5 V | 2.7 V to 5.5 V | The ADS1120 can operate at a lower minimum supply (2.3 V), which may matter for low-voltage or battery-powered systems. |
| Interface | SPI | SPI | Both use a standard SPI interface, so host microcontroller compatibility is similar. |
| Package | TSSOP-16 | TSSOP-16 | Identical package and pin count simplify PCB footprint reuse, though pin functions may differ. |
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 | ADS1146IPWR | ADS1120IPWR |
|---|---|---|
| Part Status | Active | Active |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | 2k | 2k |
| Number of Inputs | 1 | 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 | 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 |
Frequently asked questions
What are the primary functional differences between the ADS1120IPWR and ADS1146IPWR?
The ADS1120IPWR is a 16-bit, 4-channel, 2-kSPS delta-sigma ADC with an integrated PGA, dual matched current sources, and a SPI interface. The ADS1146IPWR is a 16-bit, single-channel, 2-kSPS delta-sigma ADC with an integrated PGA and SPI interface, but it does not include the dual matched current sources or the 4-channel input multiplexer found on the ADS1120. Both are pin-compatible in the same TSSOP-16 package but differ in channel count and integrated excitation current sources.
Are the ADS1120IPWR and ADS1146IPWR pin-compatible and package-compatible?
Yes. Both devices are offered in a 16-pin TSSOP (PW) package with the same pin count and footprint. However, pin functions differ between the two devices, so a direct drop-in replacement requires verifying each pin's function against the respective datasheets before substitution.
Do both devices support the same SPI interface and supply voltage range?
Both the ADS1120IPWR and ADS1146IPWR use a 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 their respective Texas Instruments datasheets. The SPI timing and register maps are device-specific and must be reviewed individually.
Which device should be selected for multi-channel sensor measurement with RTD excitation?
The ADS1120IPWR is the appropriate choice because it integrates a 4-channel input multiplexer and dual matched programmable current sources (IDACs) suitable for RTD and thermistor excitation. The ADS1146IPWR provides only a single differential input channel and does not integrate excitation current sources, so external excitation circuitry would be required.
Do both ADCs achieve the same data rate and resolution?
Both are 16-bit delta-sigma ADCs specified for up to 2 kSPS (2000 samples per second) in their standard operating modes, according to Texas Instruments datasheets. Actual effective resolution depends on PGA gain, data rate, and filter settings, which must be evaluated per the respective datasheet tables.
Can the ADS1146IPWR replace the ADS1120IPWR in an existing design without firmware changes?
No. Although the packages are the same, the register maps, channel configuration, and integrated feature sets differ between the two devices. Firmware written for the ADS1120IPWR's multiplexer and IDAC control registers will not operate correctly on the ADS1146IPWR without modification and revalidation against the ADS1146 datasheet.
What are the operating temperature ranges for these two devices?
Both the ADS1120IPWR and ADS1146IPWR are specified by Texas Instruments for an industrial operating temperature range of -40°C to +125°C (TA), as stated in their respective datasheets.