Part A
ADS1220IPWR
Texas Instruments
- Lifecycle
- Active
- Stock
- 6260 PCS
- Package
- TSSOP-16
- Series
- Acquisition de données - Convertisseur analogique - numérique (ADC)
Replacement verdict
Not a drop-in replacement
The ADS1220IPWR and ADS1212U are both 24-bit delta-sigma ADCs, but they differ fundamentally in resolution architecture, package footprint, supply voltage range, and digital interface, so the ADS1212U cannot serve as a direct drop-in substitute for the ADS1220IPWR without redesign of the board layout, power rail, and host interface.
Different package footprint
Different supply voltage range
Different digital interface
Different input channel configuration
Parts at a glance
Part B
ADS1212U
Burr Brown
- Lifecycle
- Active
- Stock
- 3412 PCS
- Package
- SOIC-18
- Series
- Acquisition de données - Convertisseur analogique - numérique (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 | ADS1220IPWR | ADS1212U | Why it matters |
|---|---|---|---|
| Resolution (bits) | 24 | 22 | Higher resolution provides finer measurement granularity; a 24-bit ADC can resolve smaller signal changes than a 22-bit device. |
| Number of input channels | 4 (2 differential / 4 single-ended) | 1 differential | More channels allow multiple sensors to be measured by one device, reducing component count and board space. |
| Maximum sample rate | 2 kSPS | 6.25 kSPS | Sample rate determines how fast varying signals can be captured; the ADS1212U supports faster acquisition than the ADS1220. |
| PGA gain range | 1 to 128 | 1 to 16 | A wider programmable gain range enables amplification of very small sensor signals, improving dynamic range for low-level inputs. |
| Supply voltage range | 2.3 V to 5.5 V | 2.7 V to 5.25 V | The supply range must match the system rail; the ADS1220 tolerates lower voltages and a slightly wider upper rail. |
| Interface | SPI | SPI | Both use SPI, so the host microcontroller interface is compatible, though register maps and command sets differ. |
| Internal reference | Yes (2.048 V) | No (external reference required) | An internal reference simplifies design and saves board space; the ADS1212U requires an external reference for accurate conversion. |
| Package | 16-pin TSSOP | 18-pin SOIC | Package footprint and pin count affect PCB layout; these are not drop-in compatible and require different land patterns. |
| Operating temperature range | -40 °C to +125 °C | -40 °C to +85 °C | The wider temperature range of the ADS1220 suits harsher environments, while the ADS1212U is limited to standard industrial conditions. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1220IPWR | ADS1212U |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Part Status | Active | Active |
| Number of Bits | 24 | 22 |
| Sampling Rate(Per Second) | 2k | 6.25k |
| Number of Inputs | 2, 4 | 1 |
| Input Type | Differential, Single Ended | Differential |
| Data Interface | SPI | SPI |
| Configuration | MUX-PGA-ADC | PGA-ADC |
| Number of A/D Converters | 1 | 1 |
| Architecture | Sigma-Delta | Sigma-Delta |
| Reference Type | External, Internal, Supply | External, Internal |
| Voltage - Supply, Analog | 2.3V ~ 5.5V, ±2.5 | 5V |
| Voltage - Supply, Digital | 2.3V ~ 5.5V | 5V |
| Features | PGA, Temperature Sensor | PGA |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 85°C |
Frequently asked questions
What are the primary differences between the ADS1220IPWR and the ADS1212U?
The ADS1220IPWR is a 24-bit, 4-channel, 2-kSPS delta-sigma ADC with an integrated PGA, voltage reference, and SPI interface in a TSSOP-16 package. The ADS1212U is a 22-bit, single-channel, 6.25-kSPS delta-sigma ADC with a PGA and SPI interface in a SOIC-18 package. Key differences include resolution (24-bit vs 22-bit), input channel count (4 vs 1), maximum data rate (2 kSPS vs 6.25 kSPS), and package footprint.
Are the ADS1220IPWR and ADS1212U pin-to-pin or package compatible?
No. The ADS1220IPWR uses a 16-pin TSSOP package, while the ADS1212U uses an 18-pin SOIC package. They differ in pin count, pin functions, and PCB land pattern, so they are not drop-in replacements and require separate layout designs.
Can the ADS1220IPWR directly replace the ADS1212U in an existing design?
No. Beyond package and pin differences, the devices differ in resolution (24-bit vs 22-bit), channel count (4 vs 1), maximum output data rate (2 kSPS vs 6.25 kSPS), and register map. A direct substitution is not possible without redesign and firmware changes validated against the respective datasheets.
How do the input channel configurations of the ADS1220IPWR and ADS1212U compare?
The ADS1220IPWR provides four input channels that can be configured as four single-ended inputs or two differential inputs through an internal input multiplexer. The ADS1212U provides a single differential input channel with a PGA. Designs requiring multiple sensor inputs favor the ADS1220IPWR, while single-channel precision measurement suits the ADS1212U.
How do the maximum data rates of the ADS1220IPWR and ADS1212U compare?
The ADS1220IPWR supports programmable data rates up to 2 kSPS. The ADS1212U supports data rates up to 6.25 kSPS. For higher-throughput single-channel applications the ADS1212U offers a faster maximum rate, while the ADS1220IPWR trades throughput for multi-channel flexibility.
Do both devices include an integrated programmable gain amplifier (PGA) and voltage reference?
Yes. Both the ADS1220IPWR and ADS1212U integrate a PGA and an on-chip voltage reference, reducing external component count for precision sensor measurement. Gain settings and reference configuration should be verified in each respective datasheet before design use.
What digital interface do the ADS1220IPWR and ADS1212U use?
Both devices use an SPI-compatible serial interface for configuration and data readout. The register maps and command sets differ between the two devices, so firmware must be written specifically for each part and cannot be reused without modification.
Which device is better suited for multi-channel sensor applications?
The ADS1220IPWR is better suited for multi-channel applications because it integrates a 4-channel input multiplexer supporting four single-ended or two differential inputs in a single TSSOP-16 package. The ADS1212U provides only a single differential input channel, making it more appropriate for single-sensor precision measurement.