Part A
ADS1220IPW
Техасские инструменты
- Lifecycle
- Active
- Stock
- 4062 ПКС
- Package
- TSSOP-16
- Series
- Сбор данных - аналогово-цифровые преобразователи (ADC)
Replacement verdict
Not a drop-in replacement
The ADS1220IPW and ADS1234IPWG4 are both 24-bit delta-sigma ADCs from Texas Instruments, but they are not functionally interchangeable. The ADS1220IPW is a 4-channel, 2-kSPS device with an integrated PGA and SPI interface in a TSSOP-16 package, while the ADS1234IPWG4 is a 4-channel, 80-SPS device with a fixed-gain PGA and a two-wire serial interface in a TSSOP-28 package. The differences in resolution speed, footprint, and digital interface require a full redesign rather than a direct substitution.
Different footprint
Different data rate
Different digital interface
Different PGA architecture
Parts at a glance
Part B
ADS1234IPWG4
Техасские инструменты
- Lifecycle
- Active
- Stock
- 5003 ПКС
- Package
- TSSOP-28
- Series
- Сбор данных - аналогово-цифровые преобразователи (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 | ADS1220IPW | ADS1234IPWG4 | Why it matters |
|---|---|---|---|
| Resolution (bits) | 24 | 24 | Both are 24-bit delta-sigma ADCs, so resolution alone does not distinguish them for substitutability. |
| Number of input channels | 4 (2 differential / 4 single-ended) | 4 (4 differential) | Channel count and differential/single-ended configuration determine how many sensors can be connected and how they are wired. |
| Input type | Differential or single-ended | Differential only | Single-ended capability in the ADS1220 allows simpler sensor interfaces, while the ADS1234 requires differential inputs. |
| Programmable gain amplifier (PGA) gain range | 1 to 128 V/V | 1 to 128 V/V | PGA gain range affects the smallest signal that can be resolved; both cover the same range here. |
| Data rate (SPS) | Up to 2000 SPS | 10 or 80 SPS (selectable) | Maximum sample rate determines suitability for fast-changing signals; the ADS1220 supports much higher throughput. |
| Interface | SPI | SPI | Both use SPI, so the host microcontroller interface is compatible between the two parts. |
| Supply voltage (analog) | 2.3 V to 5.5 V | 2.7 V to 5.3 V | Supply range affects compatibility with the system rail; the ADS1220 tolerates a slightly wider and lower minimum voltage. |
| Internal oscillator | Yes | Yes | An internal oscillator simplifies design by removing the need for an external clock source in both parts. |
| Package | TSSOP-16 | TSSOP-28 | Different package footprints and pin counts mean the two parts are not drop-in replacements on an existing PCB. |
| Operating temperature range | -40°C to +125°C | -40°C to +105°C | The wider temperature range of the ADS1220 suits harsher environments where the ADS1234 may not be rated. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1220IPW | ADS1234IPWG4 |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC,Texas Instruments |
| Part Status | Active | Discontinued at Digi-Key |
| Number of Bits | 24 | 24 |
| Sampling Rate(Per Second) | 2k | 80 |
| Number of Inputs | 2, 4 | 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, Supply | External |
| Voltage - Supply, Analog | 2.3V ~ 5.5V, ±2.5 | 2.7V ~ 5.3V |
| Voltage - Supply, Digital | 2.3V ~ 5.5V | 2.7V ~ 5.3V |
| Features | PGA, Temperature Sensor | PGA |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 105°C |
Frequently asked questions
What are the primary differences between the ADS1220IPW and ADS1234IPWG4?
The ADS1220IPW is a 24-bit, 4-channel delta-sigma ADC with a programmable gain amplifier, SPI interface, and integrated 2.048-V reference, housed in a 16-pin TSSOP. The ADS1234IPWG4 is a 24-bit, 4-channel delta-sigma ADC with an on-chip PGA and a 24-bit resolution, but it provides a 2-wire serial interface and is supplied in a 28-pin TSSOP. The ADS1234IPWG4 also integrates a low-noise PGA with gains of 1, 2, 64, and 128, while the ADS1220IPW offers gains from 1 to 128.
Are the ADS1220IPW and ADS1234IPWG4 pin-compatible?
No. The ADS1220IPW uses a 16-pin TSSOP package, whereas the ADS1234IPWG4 uses a 28-pin TSSOP package. The pin counts, pin functions, and PCB land patterns differ, so they are not drop-in replacements for each other.
Which device offers a higher maximum output data rate?
The ADS1220IPW supports programmable data rates up to 2 kSPS in normal mode and up to 2 kSPS in turbo mode (with a 20-SPS setting also available). The ADS1234IPWG4 provides data rates of 10 SPS and 80 SPS. Therefore, the ADS1220IPW supports higher maximum output data rates than the ADS1234IPWG4.
Do both ADCs include an integrated programmable gain amplifier (PGA)?
Yes. Both the ADS1220IPW and ADS1234IPWG4 integrate a low-noise PGA. The ADS1220IPW provides selectable gains of 1, 2, 4, 8, 16, 32, 64, and 128. The ADS1234IPWG4 provides selectable gains of 1, 2, 64, and 128.
What serial interfaces do these two ADCs use?
The ADS1220IPW uses a SPI-compatible serial interface. The ADS1234IPWG4 uses a 2-wire serial interface (SCLK and DRDY/DOUT) for data retrieval and configuration. The interface architectures are not interchangeable without firmware and hardware changes.
How do the supply voltage requirements compare?
The ADS1220IPW operates from an analog supply (AVDD) of 2.3 V to 5.5 V and a digital supply (DVDD) of 2.3 V to 5.5 V. The ADS1234IPWG4 operates from a single supply of 2.7 V to 5.3 V. Both devices support low-voltage operation, but the exact supply ranges and recommended decoupling differ per datasheet.
Which device is better suited for bridge sensor applications?
Both devices are suitable for bridge sensor applications because they include a PGA and 24-bit resolution. The ADS1234IPWG4 is specifically designed for weigh scales and bridge sensors with gains of 64 and 128 and low-noise performance at 10 SPS and 80 SPS. The ADS1220IPW offers more flexible gain settings (1 to 128) and higher data rates, making it suitable for a broader range of sensor signal conditioning tasks.
Can the ADS1220IPW directly replace the ADS1234IPWG4 in an existing design?
No. Direct replacement is not possible due to differences in package size (16-pin vs 28-pin TSSOP), pinout, serial interface (SPI vs 2-wire), supply voltage ranges, and PGA gain options. A redesign of the PCB layout and firmware would be required to substitute one for the other.