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 ADS1230IPWG4 are both 24-bit delta-sigma ADCs from Texas Instruments, but they are not drop-in replacements for one another. The ADS1220IPW offers a four-channel input multiplexer with a programmable gain amplifier and SPI interface in a TSSOP-16 package, while the ADS1230IPWG4 is a single-channel, fixed-gain bridge sensor ADC with a two-wire serial interface in a TSSOP-16 package. Designers must account for differences in input architecture, digital interface, gain configuration, and reference topology before considering substitution.
Different input channel count
Different digital interface
Different gain architecture
Different reference configuration
Parts at a glance
Part B
ADS1230IPWG4
Техасские инструменты
- Lifecycle
- Active
- Stock
- 6107 ПКС
- Package
- TSSOP-16
- 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 | ADS1230IPWG4 | Why it matters |
|---|---|---|---|
| Resolution (bits) | 24 | 20 | Higher resolution provides finer measurement granularity; the ADS1220 offers 4 extra bits, enabling detection of smaller signal changes. |
| Number of input channels | 4 (2 differential / 4 single-ended) | 1 differential | More channels allow multiplexing multiple sensors without external switching; the ADS1230 supports only a single differential input. |
| Input type | Differential or single-ended | Differential only | Single-ended capability simplifies interfacing with ground-referenced sensors, which the ADS1230 cannot do directly. |
| Programmable gain amplifier (PGA) | Yes, gain 1 to 128 | Yes, gain 1 or 128 | A wider gain range enables direct amplification of very small sensor signals; the ADS1230 offers only two fixed gain settings. |
| Data rate (SPS) | Up to 2000 | 10 or 80 | Higher output data rates support faster sampling and wider signal bandwidth; the ADS1230 is limited to low-speed weigh-scale rates. |
| Interface | SPI | SPI-compatible (two-wire data/clock) | Interface compatibility affects host MCU wiring and firmware; the ADS1230 uses a simplified serial interface rather than full SPI. |
| Supply voltage | 2.3 V to 5.5 V (analog and digital) | 2.7 V to 5.3 V (analog), 2.7 V to 5.5 V (digital) | Supply range determines compatibility with low-voltage rails; the ADS1220 operates down to 2.3 V, allowing use in lower-voltage systems. |
| Internal oscillator | Yes | Yes | An internal oscillator eliminates external clock components; both devices include one, simplifying the bill of materials. |
| Package | TSSOP-16 | TSSOP-16 | Package footprint affects PCB layout and drop-in compatibility; both share the same 16-pin TSSOP outline. |
| Operating temperature range | -40 °C to +125 °C | -40 °C to +85 °C | A wider temperature range supports harsh-environment applications; the ADS1220 is rated for higher ambient temperatures. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1220IPW | ADS1230IPWG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Discontinued at Digi-Key |
| Number of Bits | 24 | 20 |
| Sampling Rate(Per Second) | 2k | 80 |
| Number of Inputs | 2, 4 | 1 |
| Input Type | Differential, Single Ended | Differential, Single Ended |
| 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 |
| 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 ~ 85°C |
Frequently asked questions
What are the key architectural differences between the ADS1220IPW and ADS1230IPWG4?
The ADS1220IPW is a 24-bit, 4-channel delta-sigma ADC with a flexible input multiplexer, programmable gain amplifier (PGA), and support for up to four single-ended or two differential inputs. The ADS1230IPWG4 is a 20-bit, single-channel delta-sigma ADC with a fixed gain of 128 and a two-wire serial interface, designed primarily for weigh-scale and bridge-sensor applications.
Do the ADS1220IPW and ADS1230IPWG4 have the same resolution?
No. The ADS1220IPW provides 24-bit resolution, while the ADS1230IPWG4 provides 20-bit resolution. The higher resolution of the ADS1220IPW supports finer measurement granularity, but effective resolution depends on data rate, gain, and noise performance in the target design.
Are the ADS1220IPW and ADS1230IPWG4 pin-to-pin compatible?
No. Both devices are offered in TSSOP packages, but they are not pin-to-pin compatible. The ADS1220IPW uses a 16-pin TSSOP with SPI-compatible interface pins and multiple analog input pins, while the ADS1230IPWG4 uses a 16-pin TSSOP with a different pin function assignment, including a two-wire serial interface. PCB layouts must be designed for the specific device.
Can the ADS1220IPW directly replace the ADS1230IPWG4 in an existing design?
No, a direct replacement is not possible without design changes. The devices differ in resolution, input channel count, gain architecture, digital interface, and pin functions. The ADS1220IPW requires SPI-compatible communication and supports a multiplexed input structure, whereas the ADS1230IPWG4 uses a simpler two-wire interface and a fixed gain stage. Firmware, PCB layout, and signal-chain design must be revalidated.
Which device is better suited for multi-sensor or multi-channel measurement systems?
The ADS1220IPW is better suited for multi-channel systems because it integrates a 4-channel input multiplexer, allowing multiple single-ended or differential sensors to be connected to one ADC. The ADS1230IPWG4 is a single-channel device and would require external multiplexing for multi-sensor applications.
How do the digital interfaces of the ADS1220IPW and ADS1230IPWG4 differ?
The ADS1220IPW uses an SPI-compatible serial interface with support for multiple registers and configuration options. The ADS1230IPWG4 uses a two-wire serial interface for data output and clock control, with a more limited configuration set. System firmware and host microcontroller interface requirements differ accordingly.
Are both devices suitable for bridge sensor and weigh-scale applications?
Both devices can be used in bridge-sensor signal chains, but the ADS1230IPWG4 is specifically optimized for weigh-scale applications with a fixed gain of 128 and 20-bit resolution. The ADS1220IPW offers a programmable gain amplifier and 24-bit resolution, providing more flexibility for varied sensor types and gain requirements, but the design must be configured appropriately for bridge sensors.