Part A
AD7739BRUZ
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 1798 個数
- Package
- TSSOP-24
- Series
- データ取得 - アナログ/デジタルコンバータ (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7739BRUZ and AD7730LBRU are both high-resolution sigma-delta load-cell ADCs from Analog Devices, but they differ in resolution, interface, and package. The AD7730LBRU offers 24-bit resolution and a parallel interface in a 24-lead SOIC, while the AD7739BRUZ provides 24-bit resolution with a serial SPI interface in a 24-lead TSSOP. Because the digital interface, package footprint, and supply architecture are not identical, the AD7730LBRU is a functional candidate rather than a drop-in replacement; verify interface, layout, and supply requirements before substitution.
Resolution
Validation required
Digital Interface
Not compatible
Package Type
Not compatible
Supply Voltage
Validation required
Parts at a glance
Part B
AD7730LBRU
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 6248 個数
- Package
- TSSOP-24
- Series
- データ取得 - アナログフロントエンド (AFE)
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD7739BRUZ | AD7730LBRU | Why it matters |
|---|---|---|---|
| Resolution (bits) | 24 | 24 | Both are 24-bit sigma-delta ADCs, so resolution alone does not differentiate them for substitutability. |
| Number of input channels | 8 (differential) | 2 (differential) | Channel count determines how many sensors or signals can be multiplexed into a single device; the AD7739 supports far more inputs. |
| Maximum throughput / data rate | 15.1 kSPS | 1.2 kSPS | Higher throughput enables faster sampling of dynamic signals; the AD7739 is significantly faster than the AD7730. |
| Interface type | SPI / serial (3-wire) | SPI / serial (3-wire) | Both use a serial interface, so host microcontroller compatibility is similar for either part. |
| Supply voltage (analog) | 5 V | 5 V | Analog supply compatibility ensures the part can drop into an existing 5 V signal chain without redesign. |
| Package | 24-lead TSSOP | 24-lead TSSOP | Identical package and pin count simplify PCB layout substitution between the two devices. |
| Operating temperature range | -40 °C to +105 °C | -40 °C to +85 °C | A wider temperature range allows the AD7739 to be used in harsher industrial environments than the AD7730. |
| Integrated PGA | Yes | Yes | An on-chip programmable gain amplifier allows direct connection of low-level sensors without external front-end circuitry. |
| Typical application focus | Multi-channel industrial process control | Weigh scales / bridge sensors | The intended application differs; the AD7730 is optimized for weigh-scale bridge sensing while the AD7739 targets multi-channel process control. |
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 | AD7739BRUZ | AD7730LBRU |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | 24 | 24 |
| Number of Channels | - | 1 |
| Power (Watts) | - | 125 mW |
| Voltage - Supply, Analog | 5V | 5V |
| Voltage - Supply, Digital | 2.7V ~ 3.6V, 5V | 2.7V ~ 5.25V |
| Mounting Type | - | Surface Mount |
| Sampling Rate(Per Second) | 15.1k | - |
| Number of Inputs | 4, 8 | - |
| Input Type | Differential, Single Ended | - |
| Data Interface | SPI, DSP | - |
| Configuration | MUX-ADC | - |
| Number of A/D Converters | 1 | - |
| Architecture | Sigma-Delta | - |
| Reference Type | External | - |
| Features | True Bipolar | - |
| Operating Temperature | -40°C ~ 105°C | - |
Frequently asked questions
What are the primary functional differences between the AD7739BRUZ and the AD7730LBRU?
The AD7739BRUZ is a 24-bit, 8-channel, low-voltage, low-power sigma-delta ADC designed for high-throughput multiplexed applications, while the AD7730LBRU is a 24-bit, 2-channel, low-noise sigma-delta ADC optimized for weigh-scale and pressure-sensor applications with built-in AC excitation and a programmable gain front end. The AD7739 offers more input channels and faster channel switching, whereas the AD7730L focuses on low-noise signal conditioning for bridge transducers.
Are the AD7739BRUZ and AD7730LBRU pin-compatible?
No. Both devices are offered in a 24-lead TSSOP package, but their pin functions and internal architectures differ. The AD7739BRUZ provides eight differential input channels with a multiplexer, while the AD7730LBRU provides two differential input channels with dedicated AC excitation and reference inputs. Pin assignments are not interchangeable, and PCB layouts must be designed separately for each device.
Can the AD7739BRUZ directly replace the AD7730LBRU in an existing weigh-scale design?
No, a direct replacement is not possible without redesign. The AD7730LBRU includes specialized features for weigh-scale applications such as AC excitation, a low-noise programmable gain amplifier, and a burnout current source that the AD7739BRUZ does not provide. Additionally, the channel count, pinout, and register maps differ, so firmware and hardware must be revalidated.
What are the resolution and data rate specifications for each device?
Both devices are 24-bit sigma-delta ADCs. The AD7739BRUZ supports programmable output data rates up to 15.4 kSPS with a fast channel switching time of approximately 2 microseconds, making it suitable for multiplexed multi-channel systems. The AD7730LBRU supports output data rates up to 800 Hz with a low-noise programmable gain front end optimized for precision weigh-scale measurements. Exact noise-free resolution depends on gain, filter settings, and data rate as specified in the respective datasheets.
Which device is better suited for multi-channel data acquisition systems?
The AD7739BRUZ is better suited for multi-channel data acquisition because it integrates an 8-channel differential multiplexer with fast channel switching, allowing efficient scanning of multiple sensor inputs. The AD7730LBRU is limited to two differential input channels and is intended for single- or dual-bridge sensor applications rather than high-channel-count scanning.
Do both devices support the same digital interface?
Both devices provide a serial interface compatible with SPI and MICROWIRE standards, but their register sets, control words, and timing specifications differ. Firmware written for one device cannot be reused directly on the other without modification and revalidation against the respective datasheet timing and register definitions.
What are the supply voltage and power consumption characteristics of each device?
The AD7739BRUZ operates from a single 5 V analog supply with a 3 V digital supply and is specified for low-power operation suitable for portable and multiplexed systems. The AD7730LBRU operates from a 5 V analog supply and a 3 V or 5 V digital supply, with power consumption dependent on the programmable gain and data rate settings. Designers should consult the respective datasheets for exact quiescent current and power-down specifications.