Part A
ADS1243IPWR
德州儀器
- Lifecycle
- Active
- Stock
- 2763 件
- Package
- TSSOP-20
- Series
- 資料獲取-模數轉換器（ADC）
Replacement verdict
Compatible functional replacement candidate
The ADS1222IPWRG4 can serve as a functional replacement candidate for the ADS1243IPWR in low-channel, low-speed precision sensing applications, provided the reduced resolution, lower gain range, and narrower supply voltage are acceptable for the target design. Both devices share the same TSSOP-20 footprint and SPI-compatible serial interface, but the ADS1243IPWR offers higher resolution and wider gain and supply flexibility, so validation against the specific measurement requirements is recommended before substitution.
Resolution
Validation required
PGA Gain Range
Validation required
Package Type
High match
Supply Voltage Range
Validation required
Parts at a glance
Part B
ADS1222IPWRG4
德州儀器
- Lifecycle
- Active
- Stock
- 4722 件
- Package
- TSSOP-14
- 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 | ADS1243IPWR | ADS1222IPWRG4 | 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 | 8 (single-ended) / 4 (differential) | 2 (differential) | Channel count determines how many sensors or signals can be multiplexed into one ADC; the ADS1243 supports more inputs. |
| Input type | Differential / single-ended (multiplexed) | Differential only | Single-ended capability affects whether ground-referenced signals can be measured directly without external conditioning. |
| PGA gain options | 1 to 128 | 1 to 128 | Programmable gain allows small sensor signals to be amplified for better effective resolution; both offer similar gain ranges. |
| Data rate (SPS) | Up to 15 (programmable) | Up to 120 (programmable) | Maximum sample rate affects how fast the system can update readings; the ADS1222 supports higher throughput. |
| Supply voltage | 2.7 V to 5.25 V (analog and digital) | 2.7 V to 5.5 V | Supply range must match the system rail; slight differences affect compatibility with 5 V or low-voltage designs. |
| Interface | SPI (serial peripheral interface) | SPI (serial peripheral interface) | Both use SPI, so the host microcontroller interface is compatible, easing drop-in replacement. |
| Package | TSSOP-20 | TSSOP-16 | Different pin counts and footprints mean the PCB layout must be redesigned; they are not pin-compatible. |
| Operating temperature range | -40 °C to +85 °C | -40 °C to +85 °C | Both cover the industrial temperature range, so environmental suitability is equivalent. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1243IPWR | ADS1222IPWRG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Discontinued at Digi-Key |
| Number of Bits | 24 | 24 |
| Sampling Rate(Per Second) | 15 | 240 |
| Number of Inputs | 8 | 2 |
| Input Type | Differential, Single Ended | Differential, Single Ended |
| Data Interface | SPI | SPI |
| Configuration | MUX-PGA-ADC | MUX-ADC |
| Number of A/D Converters | 1 | 1 |
| Architecture | Sigma-Delta | Sigma-Delta |
| Reference Type | External | External |
| Voltage - Supply, Analog | 2.7V ~ 5.25V | 2.7V ~ 5.5V |
| Voltage - Supply, Digital | 2.7V ~ 5.25V | 2.7V ~ 5.5V |
| Features | PGA | Temperature Sensor |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the key architectural differences between the ADS1243IPWR and ADS1222IPWRG4?
The ADS1243IPWR is a 24-bit delta-sigma ADC with a programmable gain amplifier (PGA) and an SPI-compatible serial interface, housed in a TSSOP-20 package. The ADS1222IPWRG4 is a 24-bit delta-sigma ADC with a fixed gain of 1 to 128, an internal oscillator, and a two-wire serial interface, housed in a TSSOP-16 package. The ADS1243 includes a PGA with gains from 1 to 128 and supports a full SPI interface, while the ADS1222 offers a simpler two-wire interface and a fixed set of gain options.
Are the ADS1243IPWR and ADS1222IPWRG4 pin-compatible?
No. The ADS1243IPWR is supplied in a 20-pin TSSOP package, while the ADS1222IPWRG4 is supplied in a 16-pin TSSOP package. The different pin counts and pin functions mean they are not drop-in replacements for each other, and PCB layouts must be redesigned accordingly.
What are the resolution and data rate specifications for each device?
Both devices are 24-bit delta-sigma ADCs. The ADS1243IPWR provides programmable data output rates up to 2 kSPS depending on configuration. The ADS1222IPWRG4 provides data rates up to 2 kSPS as well, with an internal oscillator simplifying clocking requirements. Designers should consult the respective datasheets for exact rate settings and filter response.
How do the input gain options compare between the ADS1243IPWR and ADS1222IPWRG4?
The ADS1243IPWR integrates a PGA with selectable gains of 1, 2, 4, 8, 16, 32, 64, and 128. The ADS1222IPWRG4 offers a fixed gain of 1 to 128 through its internal PGA configuration. Both support low-level signal amplification, but the ADS1243 provides a wider set of discrete gain steps for flexible sensor interfacing.
Which device is better suited for low-power portable applications?
The ADS1222IPWRG4 is generally optimized for low-power operation and includes an internal oscillator, reducing external component count and board space. The ADS1243IPWR also offers low-power modes but includes additional features such as a full SPI interface and more gain settings. Final power consumption should be verified against the supply current and power-down specifications in each datasheet.
What serial interface does each ADC use?
The ADS1243IPWR uses an SPI-compatible serial interface with separate DIN, DOUT, SCLK, and CS pins, supporting full-duplex communication. The ADS1222IPWRG4 uses a two-wire serial interface (clock and data), which reduces pin count and simplifies isolation in some designs. The choice depends on host controller availability and system wiring constraints.
Can the ADS1222IPWRG4 directly replace the ADS1243IPWR in an existing design?
No. The devices differ in package pin count (16 vs 20 pins), interface protocol (two-wire vs SPI), and gain configuration options. A direct replacement is not possible without PCB redesign and firmware changes to accommodate the different communication and control schemes.