Part A
AD7732BRUZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6723 PCS
- Package
- TSSOP-28
- Series
- Data Acquisition - Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7738BRU is a functional replacement candidate for the AD7732BRUZ, sharing the same 24-bit sigma-delta architecture, TSSOP-28 footprint, and SPI interface, but requiring validation of channel count, input configuration, and data rate differences before substitution in the target design.
Channel Count
Validation required
Input Configuration
Validation required
Package Type
High match
Data Rate
Validation required
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD7732BRUZ | AD7738BRU | Why it matters |
|---|---|---|---|
| Number of Input Channels | 2 (differential) | 8 (4 differential / 8 single-ended) | Channel count determines how many sensor signals the ADC can digitize; a 2-channel part cannot directly replace an 8-channel part in multi-sensor systems. |
| Resolution | 24-bit | 24-bit | Both provide 24-bit resolution, so precision-critical applications can generally rely on equivalent nominal resolution. |
| Maximum Output Data Rate | 15.4 kSPS | 15.4 kSPS | Data rate affects throughput and settling time; matching rates means similar sampling performance for both parts. |
| Interface Type | SPI / QSPI / MICROWIRE / DSP compatible serial | SPI / QSPI / MICROWIRE / DSP compatible serial | A matching serial interface allows the same host microcontroller and firmware to communicate with either device. |
| Supply Voltage (Analog) | 5 V | 5 V | Analog supply compatibility ensures the same signal conditioning and reference circuitry can be reused. |
| Package / Mounting | 28-TSSOP (surface mount) | 28-TSSOP (surface mount) | Identical package and footprint allow a drop-in PCB replacement without layout changes. |
| Operating Temperature Range | -40°C to +105°C | -40°C to +105°C | Matching temperature ratings ensure both parts suit the same industrial environments. |
| Input Type | Differential | Differential / Single-ended (configurable) | The AD7738 supports single-ended inputs, giving greater flexibility for sensor wiring than the differential-only AD7732. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7732BRUZ | AD7738BRU |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | 24 | 24 |
| Sampling Rate(Per Second) | 15.4k | 15.4k |
| Number of Inputs | 2 | 4, 8 |
| Input Type | Differential | Differential, Single Ended |
| Data Interface | SPI, DSP | SPI, DSP |
| Configuration | MUX-ADC | MUX-ADC |
| Number of A/D Converters | 1 | 1 |
| Architecture | Sigma-Delta | Sigma-Delta |
| Reference Type | External | External |
| Voltage - Supply, Analog | 5V | 5V |
| Voltage - Supply, Digital | 2.7V ~ 3.6V, 5V | 2.7V ~ 3.6V, 5V |
| Features | - | True Bipolar |
| Operating Temperature | -40°C ~ 105°C | -40°C ~ 105°C |
Frequently asked questions
What are the primary differences between the AD7732BRUZ and the AD7738BRU?
The AD7732BRUZ is a 2-channel, 24-bit sigma-delta ADC, while the AD7738BRU is an 8-channel, 24-bit sigma-delta ADC. Both are pin-compatible in the same 28-lead TSSOP package, but the AD7738BRU provides six additional input channels. The AD7732BRUZ offers a higher maximum output data rate of 15.4 kSPS per channel, whereas the AD7738BRU supports up to 4.6 kSPS per channel.
Are the AD7732BRUZ and AD7738BRU pin-compatible?
Yes. Both devices are offered in a 28-lead TSSOP package with the same pinout, allowing the AD7738BRU to be used as a drop-in replacement for the AD7732BRUZ when additional channels are required, provided the firmware is updated to account for the different channel count and register map.
What is the resolution and architecture of these ADCs?
Both the AD7732BRUZ and AD7738BRU are 24-bit sigma-delta (Σ-Δ) analog-to-digital converters. They provide true 24-bit no-missing-code performance and are designed for high-resolution industrial measurement applications.
How do the input channel configurations differ?
The AD7732BRUZ provides 2 fully differential input channels. The AD7738BRU provides 8 input channels that can be configured as either 8 single-ended or 4 fully differential inputs. This makes the AD7738BRU better suited for multi-channel data acquisition systems.
What are the maximum output data rates for each device?
The AD7732BRUZ supports output data rates up to 15.4 kSPS per channel. The AD7738BRU supports output data rates up to 4.6 kSPS per channel. Designs requiring faster per-channel throughput should select the AD7732BRUZ.
Do both devices support the same digital interface?
Yes. Both the AD7732BRUZ and AD7738BRU feature a serial SPI-compatible interface supporting read and write operations, and both include a programmable logic interface for direct connection to microcontrollers or DSPs. The register maps differ due to the channel count, so firmware must be adapted accordingly.
What are the supply voltage and power requirements?
Both devices operate from a single 5 V analog supply (AVDD) and a 2.7 V to 5.25 V digital supply (DVDD). The AD7732BRUZ typically consumes approximately 30 mW, while the AD7738BRU typically consumes approximately 35 mW, reflecting the additional channel circuitry.
Which device is better for multi-channel industrial measurement systems?
The AD7738BRU is better suited for multi-channel systems because it provides 8 single-ended or 4 differential input channels in the same package footprint. The AD7732BRUZ is preferable when only 2 differential channels are needed and higher per-channel throughput is required.