Part A
ADS1220IRVAR
Texas Instruments
- Lifecycle
- Active
- Stock
- 4438 PCS
- Package
- VQFN-16
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (ADC)
Replacement verdict
Not a drop-in replacement
The ADS1204IRHBR and ADS1220IRVAR are not drop-in replacements for each other. The ADS1204IRHBR is a four-channel delta-sigma modulator delivering a 1-bit serial bitstream output, while the ADS1220IRVAR is a single-channel 24-bit delta-sigma ADC with an SPI-compatible interface and integrated PGA. They differ in resolution architecture, output interface, channel count, and package footprint, so substituting one for the other requires a full redesign of the signal chain and board layout.
Different output type
Different channel count
Different resolution architecture
Different package footprint
Parts at a glance
Part B
ADS1204IRHBR
Texas Instruments
- Lifecycle
- Active
- Stock
- 6898 PCS
- Package
- VQFN-32
- Series
- Acquisição de dados - ADCs-DACs - Objetivo Especial
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADS1204IRHBR | ADS1220IRVAR | Why it matters |
|---|---|---|---|
| Resolution (bits) | 16 | 24 | Higher resolution allows detection of smaller signal changes; the 24-bit ADS1220 offers finer measurement granularity than the 16-bit ADS1204. |
| Architecture | Delta-sigma modulator | Delta-sigma ADC (with PGA and reference) | The ADS1204 is a modulator-only device requiring external digital filtering, while the ADS1220 is a complete ADC with integrated PGA and reference, affecting system complexity and design effort. |
| Input channels | 4 (differential) | 4 (2 differential / 4 single-ended) | Channel configuration determines how many sensors can be connected and whether differential or single-ended measurements are supported. |
| Integrated PGA | No | Yes (gain 1 to 128) | An integrated PGA allows direct amplification of low-level sensor signals without external amplifiers, simplifying the signal chain. |
| Integrated voltage reference | No | Yes | An internal reference reduces external component count and board space; the ADS1204 requires an external reference for ratiometric or absolute measurements. |
| Output interface | Serial bit-stream (modulator output) | SPI | The output format dictates the host interface and whether an external digital filter (e.g., sinc filter) is needed to obtain conversion results. |
| Supply voltage (analog) | 4.5 V to 5.5 V | 2.3 V to 5.5 V | The wider supply range of the ADS1220 enables operation from lower-voltage rails, which is important for battery-powered and low-voltage systems. |
| Package | VQFN-32 (5x5 mm) | VQFN-16 (3.5x3.5 mm) | Package footprint and pin count affect PCB layout, board space, and the ability to drop-in substitute one part for the other. |
| Operating temperature range | -40°C to +85°C | -40°C to +125°C | A wider temperature range allows use in harsher environments and industrial applications where the ADS1204 may not be rated. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1220IRVAR | ADS1204IRHBR |
|---|---|---|
| Part Status | Active | Active |
| Number of Bits | 24 | - |
| Sampling Rate(Per Second) | 2k | 40k |
| Number of Inputs | 2, 4 | - |
| Input Type | Differential, Single Ended | - |
| Data Interface | SPI | Parallel |
| Configuration | MUX-PGA-ADC | - |
| Number of A/D Converters | 1 | - |
| Architecture | Sigma-Delta | - |
| Reference Type | External, Internal, Supply | - |
| Voltage - Supply, Analog | 2.3V ~ 5.5V, ±2.5 | - |
| Voltage - Supply, Digital | 2.3V ~ 5.5V | - |
| Features | PGA, Temperature Sensor | - |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 105°C |
| Type | - | Modulator |
| Number of Channels | - | 4 |
| Resolution(Bits) | - | 16 b |
| Voltage Supply Source | - | Analog and Digital |
| Voltage - Supply | - | 2.7V ~ 5.5V |
| Mounting Type | - | Surface Mount |
Frequently asked questions
What are the primary differences between the ADS1204IRHBR and the ADS1220IRVAR?
The ADS1204IRHBR is a four-channel, 16-bit delta-sigma modulator with a nominal clock frequency of 10 MHz, designed for isolated current and voltage sensing. The ADS1220IRVAR is a single-channel, 24-bit delta-sigma ADC with an integrated PGA, voltage reference, and SPI interface, intended for precision sensor measurement. They differ in resolution, channel count, output format, and intended application architecture.
Are the ADS1204IRHBR and ADS1220IRVAR pin-to-pin compatible?
No. The ADS1204IRHBR is supplied in a 32-pin VQFN (RHB) package, while the ADS1220IRVAR is supplied in a 16-pin VQFN (RVA) package. The pin counts, pin functions, and package dimensions differ, so they are not direct drop-in replacements.
What output interface does each device provide?
The ADS1204IRHBR provides a 1-bit delta-sigma modulator output stream (data and clock) per channel, which requires an external digital filter or FPGA/controller for decimation. The ADS1220IRVAR provides a complete ADC with a SPI-compatible serial interface that outputs fully decimated 24-bit conversion results.
Do both devices include an integrated programmable gain amplifier (PGA)?
No. The ADS1220IRVAR includes an integrated low-noise PGA with selectable gains of 1, 2, 4, 8, 16, 32, 64, and 128 V/V. The ADS1204IRHBR does not include an integrated PGA; it is a modulator-only device, so signal conditioning must be performed externally.
How do the resolution and data rate specifications compare?
The ADS1204IRHBR is a 16-bit modulator with a maximum clock input of 10 MHz, yielding a modulator data rate determined by the external clock. The ADS1220IRVAR is a 24-bit ADC with programmable data rates from 5 SPS to 2,000 SPS in normal mode. The ADS1220IRVAR therefore offers higher resolution and a complete digital output, while the ADS1204IRHBR offers a high-speed bitstream suitable for external digital filtering.
What are the typical supply voltage requirements for each part?
The ADS1204IRHBR operates from a 5 V analog supply (AVDD) and a 3.0 V to 5.5 V digital supply (DVDD). The ADS1220IRVAR operates from a 2.7 V to 5.5 V analog supply (AVDD) and a 2.7 V to 5.5 V digital supply (DVDD). Both devices support separate analog and digital supplies, but the ADS1204IRHBR requires a 5 V analog rail.
Which device is better suited for isolated current-sense applications?
The ADS1204IRHBR is specifically designed for isolated current and voltage sensing, as its modulator output can be galvanically isolated using digital isolators before decimation. The ADS1220IRVAR is a general-purpose precision ADC and does not provide a modulator bitstream output, making it less suitable for direct isolated-sensing architectures without additional isolation circuitry.
Can the ADS1220IRVAR replace the ADS1204IRHBR in an existing design?
Not directly. The ADS1220IRVAR has a different package, pinout, channel count, output interface, and lacks the modulator bitstream output of the ADS1204IRHBR. A redesign of the PCB, digital interface, and signal chain would be required, and the system-level performance must be revalidated against the original design requirements.