Part A
ADS1147IPWR
德州儀器
- Lifecycle
- Active
- Stock
- 1435 件
- Package
- TSSOP-20
- Series
- 資料獲取-模數轉換器（ADC）
Replacement verdict
Compatible functional replacement candidate
The ADS1120IPWR and ADS1147IPWR share the same TSSOP-16 footprint, 2.0 V to 5.5 V analog supply range, and integrated PGA architecture, making the ADS1120IPWR a viable functional replacement candidate for the ADS1147IPWR in many precision sensor measurement designs. However, the ADS1120IPWR provides 16-bit resolution with a single differential or dual single-ended input pair, while the ADS1147IPWR offers 16-bit resolution with a 4-channel input multiplexer and integrated excitation current sources, so channel count and on-chip excitation must be validated against the target application before substitution.
Package Type
High match
Supply Voltage Range
High match
Input Channel Count
Validation required
Integrated Excitation Current Source
Not compatible
Parts at a glance
Part B
ADS1120IPWR
德州儀器
- Lifecycle
- Active
- Stock
- 5942 件
- Package
- TSSOP-16
- Series
- 資料獲取-模數轉換器（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 | ADS1147IPWR | Why it matters |
|---|---|---|---|
| Resolution (bits) | 16 | 16 | Both are 16-bit delta-sigma ADCs, so resolution is equivalent and not a differentiator for substitutability. |
| Number of input channels (differential) | 2 | 4 | The ADS1147 offers twice the differential input channels, which matters if the application needs to measure more sensor inputs without external multiplexing. |
| Integrated PGA gain range | 1 to 128 | 1 to 128 | Identical PGA gain ranges allow similar small-signal amplification for low-level sensors such as thermocouples and RTDs. |
| Integrated excitation current sources | 2 (10 µA to 1.5 mA) | 2 (10 µA to 1.5 mA) | Both provide dual programmable excitation current sources, enabling direct RTD biasing in either device. |
| Internal reference voltage | 2.048 V | 2.048 V | Matching internal references simplify ratiometric measurement design and allow similar accuracy without external references. |
| Maximum sample rate (SPS) | 2000 | 2000 | Equal maximum throughput means both can support similar data acquisition rates for most sensor applications. |
| Supply voltage range (AVDD) | 2.3 V to 5.5 V | 2.7 V to 5.5 V | The ADS1120 supports a slightly lower minimum supply, which can matter in low-voltage or battery-powered designs. |
| Package | TSSOP-16 | TSSOP-20 | Different pin counts and footprints mean the two parts are not drop-in PCB compatible and require layout changes. |
| Interface | SPI | SPI | Both use SPI, so the same host microcontroller interface can be reused across either device. |
| Operating temperature range | -40 °C to +125 °C | -40 °C to +125 °C | Identical industrial temperature ranges make both suitable for the same harsh-environment applications. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1147IPWR | ADS1120IPWR |
|---|---|---|
| Part Status | Active | Active |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | 2k | 2k |
| Number of Inputs | 2, 3 | 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 |
| 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 ADS1147IPWR?
The ADS1120IPWR is a 16-bit, 4-channel, 2-kSPS delta-sigma ADC with an integrated PGA, VREF, oscillator, and SPI interface in a TSSOP-16 package. The ADS1147IPWR is a 16-bit, 4-channel (2 differential) delta-sigma ADC with an integrated PGA, VREF, oscillator, and SPI interface in a TSSOP-20 package, and it additionally integrates a precision temperature sensor and a burnout current source (BCS) for sensor diagnostics. Both share the same 16-bit delta-sigma core and SPI interface, but the ADS1147IPWR offers more analog inputs and integrated diagnostic features.
Are the ADS1120IPWR and ADS1147IPWR pin-to-pin compatible?
No. The ADS1120IPWR is supplied in a 16-pin TSSOP (IPW) package, while the ADS1147IPWR is supplied in a 20-pin TSSOP (IPW) package. The different pin counts and pin assignments mean they are not drop-in replacements and require different PCB footprints.
Do both devices support the same SPI interface and supply voltage range?
Yes. Both the ADS1120IPWR and ADS1147IPWR 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 inputs (AIN0–AIN3) with a flexible input multiplexer. The ADS1147IPWR provides 4 single-ended or 2 differential inputs (AIN0–AIN3) plus additional inputs for the internal temperature sensor and burnout current source diagnostics. Both use an integrated PGA with gains from 1 to 128.
Which device is better suited for RTD and thermocouple measurement applications?
Both devices are well suited for precision sensor measurement. The ADS1147IPWR includes an integrated precision temperature sensor and burnout current source, which can simplify cold-junction compensation and open-sensor detection in thermocouple and RTD designs. The ADS1120IPWR provides the same core ADC performance in a smaller 16-pin package when those extra diagnostic features are not required.
Do both ADCs offer the same data rate and resolution?
Yes. Both the ADS1120IPWR and ADS1147IPWR are 16-bit delta-sigma ADCs supporting programmable data rates up to 2 kSPS in normal mode, with the same digital filter options (sinc1, sinc2, sinc3, and a 20-SPS low-noise mode) as documented in the Texas Instruments datasheets.
Can the ADS1120IPWR be used as a substitute for the ADS1147IPWR in an existing design?
Not directly. Although both are 16-bit delta-sigma ADCs with similar core performance, the ADS1120IPWR is a 16-pin device while the ADS1147IPWR is a 20-pin device with additional integrated features (temperature sensor and burnout current source). A substitution requires a PCB redesign and verification that the omitted features are not needed by the application.