Part A
ADS1256IDBT
Texas Instruments
- Lifecycle
- Active
- Stock
- 4833 PCS
- Package
- SSOP-28
- Series
- Acquisition de données - Convertisseur analogique - numérique (ADC)
Replacement verdict
Not a drop-in replacement
The ADS1219IPWR and ADS1256IDBT are not drop-in replacements for one another. They differ in resolution, channel count, package footprint, and communication interface, so substituting one for the other requires a full schematic and firmware redesign rather than a direct swap.
Different resolution
Different channel count
Different package footprint
Different interface type
Parts at a glance
Part B
ADS1219IPWR
Texas Instruments
- Lifecycle
- Active
- Stock
- 5923 PCS
- Package
- TSSOP-16
- 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 | ADS1219IPWR | ADS1256IDBT | Why it matters |
|---|---|---|---|
| Resolution (bits) | 24 | 24 | Both are 24-bit delta-sigma ADCs, so resolution alone does not differentiate them for substitutability. |
| Number of input channels | 4 (single-ended/differential) | 8 (single-ended) / 4 (differential) | Channel count determines how many signals can be measured; the ADS1256 supports more inputs, affecting system architecture. |
| Maximum sample rate (SPS) | 1000 | 30000 | Sample rate limits the bandwidth of signals that can be captured; the ADS1256 is far faster, which matters for high-speed acquisition. |
| Interface | I2C | SPI | The digital interface must match the host microcontroller; I2C vs SPI is a fundamental compatibility difference. |
| PGA gain range | 1 to 128 | 1 to 64 | Programmable gain affects the ability to resolve small signals; different gain ranges change sensitivity to low-level inputs. |
| Supply voltage (analog) | 2.7 V to 5.5 V | 5 V (4.75 V to 5.25 V) | Supply requirements determine power-rail compatibility; the ADS1219 is more flexible across lower-voltage systems. |
| Package | TSSOP-16 | SSOP-28 | Package footprint and pin count affect PCB layout and cannot be directly substituted without redesign. |
| Operating temperature range | -40 °C to +125 °C | -40 °C to +85 °C | Temperature range affects suitability for harsh environments; the ADS1219 supports a wider industrial range. |
| Internal oscillator | Yes | No (requires external crystal/clock) | An internal oscillator simplifies design and reduces external components; the ADS1256 needs an external clock source. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1256IDBT | ADS1219IPWR |
|---|---|---|
| Part Status | Active | Active |
| Number of Bits | 24 | 24 |
| Sampling Rate(Per Second) | 30k | 1k |
| Number of Inputs | 4, 8 | 4 |
| Input Type | Differential, Single Ended | Differential, Single Ended |
| Data Interface | SPI | I²C |
| Configuration | MUX-PGA-ADC | MUX-ADC |
| Number of A/D Converters | 1 | 1 |
| Architecture | Sigma-Delta | Sigma-Delta |
| Reference Type | External | External, Internal |
| Voltage - Supply, Analog | 5V | 2.3V ~ 5.5V |
| Voltage - Supply, Digital | 1.8V ~ 3.6V | 2.3V ~ 5.5V |
| Features | PGA | PGA |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 125°C |
| Ratio - S / H: ADC | - | 0:1 |
Frequently asked questions
What are the key architectural differences between the ADS1219IPWR and ADS1256IDBT?
The ADS1219IPWR is a 4-channel, 24-bit delta-sigma ADC with a fixed gain of 1 and an I2C interface, housed in a TSSOP-16 package. The ADS1256IDBT is an 8-channel, 24-bit delta-sigma ADC featuring a programmable gain amplifier (PGA) with gains from 1 to 64, a SPI interface, and a TSSOP-28 package. The ADS1256 also provides a higher maximum data rate of 30 kSPS versus 1 kSPS for the ADS1219.
Can the ADS1219IPWR and ADS1256IDBT be used interchangeably in the same PCB design?
No. The two devices differ in package footprint (TSSOP-16 vs TSSOP-28), pin count, pin functions, and communication interface (I2C vs SPI). They are not pin-compatible and cannot be directly substituted without a PCB redesign and firmware changes.
How do the input channel counts and PGA capabilities compare?
The ADS1219IPWR provides 4 single-ended or 2 differential input channels with a fixed gain of 1. The ADS1256IDBT provides 8 single-ended or 4 differential input channels and integrates a PGA with selectable gains of 1, 2, 4, 8, 16, 32, and 64, allowing direct connection of low-level signals without external amplification.
What are the maximum data rates of each converter?
The ADS1219IPWR supports programmable data rates up to 1 kSPS. The ADS1256IDBT supports programmable data rates up to 30 kSPS, making it more suitable for higher-speed acquisition applications.
Which digital interface does each device use, and how does that affect system design?
The ADS1219IPWR uses an I2C interface, requiring only two signal lines (SDA and SCL) plus an address pin, which simplifies routing and allows multiple devices on the same bus. The ADS1256IDBT uses a SPI interface with separate DIN, DOUT, SCLK, and CS lines, offering higher throughput and full-duplex communication but requiring more microcontroller pins.
How do the supply voltage requirements differ?
The ADS1219IPWR operates from an analog supply of 2.7 V to 5.5 V and a digital supply of 1.65 V to 5.5 V. The ADS1256IDBT operates from an analog supply of 5 V (4.75 V to 5.25 V) and a digital supply of 1.8 V to 3.6 V, so the two devices are not drop-in replacements in terms of power rail design.
Which device is better suited for low-power or portable applications?
The ADS1219IPWR is better suited for low-power and portable designs. It offers lower power consumption and a wider analog supply range starting at 2.7 V, whereas the ADS1256IDBT requires a 5 V analog supply and consumes more power due to its higher speed and integrated PGA.
What are the typical application differences between the ADS1219IPWR and ADS1256IDBT?
The ADS1219IPWR is typically used in low-power sensor measurement, portable instrumentation, and multi-channel data acquisition where a simple I2C interface and moderate speed are sufficient. The ADS1256IDBT is typically used in higher-speed, higher-resolution industrial measurement systems, weigh scales, and applications requiring PGA gain stages and faster sampling rates.