Part A
AD7923BRUZ
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 1788 PCS
- Package
- TSSOP-16
- Series
- Acquisition de données - Convertisseur analogique - numérique (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7923BRUZ and AD7928BRU are both 12-bit successive-approximation ADCs from Analog Devices in 16-lead TSSOP packages, sharing the same serial interface family and reference architecture. However, they differ in channel count and throughput rate, so the AD7928BRU is only a functional candidate where the higher channel count and faster conversion rate are acceptable and the board layout is reviewed against the pinout differences.
Channel Count
Validation required
Throughput Rate
Validation required
Resolution
High match
Package Type
High match
Parts at a glance
Part B
AD7928BRU
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 3502 PCS
- Package
- TSSOP-20
- Series
- Acquisition de données - Convertisseur analogique - numérique (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 | AD7923BRUZ | AD7928BRU | Why it matters |
|---|---|---|---|
| Resolution | 12 bit | 12 bit | Both are 12-bit ADCs, so conversion resolution is equivalent and does not affect substitutability. |
| Number of Input Channels | 4 channels (single-ended) | 8 channels (single-ended) | The AD7928 provides twice the channel count, which is critical if the application needs to monitor more analog signals. |
| Sampling Rate | 200 kSPS | 1 MSPS | The AD7928 offers a much higher throughput, enabling faster signal acquisition and wider bandwidth applications. |
| Supply Voltage | 2.7 V to 5.25 V | 2.7 V to 5.25 V | Identical supply range means both parts can operate from the same system rails without level shifting. |
| Interface Type | SPI / QSPI / MICROWIRE / DSP compatible | SPI / QSPI / MICROWIRE / DSP compatible | Both use the same serial interface, so firmware and host controller connections are compatible. |
| Package | 16-lead TSSOP | 20-lead TSSOP | Different package footprints require PCB layout changes, affecting drop-in substitutability. |
| Power Consumption | Approx. 3.5 mW at 200 kSPS (5 V) | Approx. 6 mW at 1 MSPS (5 V) | The AD7928 consumes more power due to higher throughput, which matters for low-power or thermally constrained designs. |
| Input Type | Single-ended | Single-ended | Both accept single-ended inputs, so signal conditioning requirements are the same. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical temperature ratings mean both suit the same industrial environments. |
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 | AD7923BRUZ | AD7928BRU |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | 12 | 12 |
| Sampling Rate(Per Second) | 200k | 1M |
| Data Interface | SPI, DSP | SPI, DSP |
| Number of A/D Converters | 1 | 1 |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 85°C |
| Number of Inputs | 4 | - |
| Input Type | Single Ended | - |
| Configuration | MUX-S/H-ADC | - |
| Ratio - S / H: ADC | 1:1 | - |
| Architecture | SAR | - |
| Reference Type | External | - |
| Voltage - Supply, Analog | 2.7V ~ 5.25V | - |
| Voltage - Supply, Digital | 2.7V ~ 5.25V | - |
Frequently asked questions
What are the key differences between the AD7923BRUZ and the AD7928BRU?
The AD7923BRUZ is a 4-channel, 12-bit successive-approximation ADC, while the AD7928BRU is an 8-channel, 12-bit SAR ADC. Both are specified for a 2.7 V to 5.25 V supply and offer throughput rates up to 1 MSPS, but the AD7928BRU provides twice the analog input channel count of the AD7923BRUZ. Both are offered in a 20-lead TSSOP package.
Are the AD7923BRUZ and AD7928BRU pin-compatible?
No. Although both devices are housed in a 20-lead TSSOP, the AD7923BRUZ provides four analog input channels while the AD7928BRU provides eight, so the analog input pin assignments differ. A direct drop-in replacement is not possible without verifying pin functions and the PCB layout against the respective datasheets.
Do the AD7923BRUZ and AD7928BRU support the same serial interface?
Yes. Both devices use a high-speed serial interface compatible with SPI, QSPI, MICROWIRE, and DSP interface standards, allowing them to interface with a wide range of microcontrollers and digital signal processors.
What is the maximum throughput rate of the AD7923BRUZ and AD7928BRU?
Both the AD7923BRUZ and the AD7928BRU are specified for a throughput rate of up to 1 MSPS, allowing conversion of a full channel set at high speed for their respective channel counts.
What supply voltage range do the AD7923BRUZ and AD7928BRU require?
Both devices operate from a single supply of 2.7 V to 5.25 V. The AD7923BRUZ and AD7928BRU also provide a separate VDRIVE pin that allows the serial interface logic levels to be set independently of the analog supply.
Can the AD7928BRU be used as a replacement for the AD7923BRUZ in an existing design?
Not as a direct drop-in replacement. The AD7928BRU offers eight analog input channels versus four on the AD7923BRUZ, and the pin assignments differ. Any substitution requires review of the schematic, PCB layout, and firmware channel addressing against the AD7928BRU datasheet.
What package do the AD7923BRUZ and AD7928BRU use?
Both the AD7923BRUZ and the AD7928BRU are supplied in a 20-lead TSSOP package. The "RU" suffix in both part numbers denotes this package type.