Part A
AD7923BRUZ
Компания Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 1788 ПКС
- Package
- TSSOP-16
- Series
- Сбор данных - аналогово-цифровые преобразователи (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7923BRUZ is a functional replacement candidate for the AD7928BRUZ only in applications that can accept a reduced channel count and lower throughput; the shared 12-bit SAR architecture, TSSOP-16 footprint, and identical supply and temperature ratings support evaluation, but the 4-channel versus 8-channel configuration and 200 kSPS versus 1 MSPS throughput must be validated against the system requirements before substitution.
Resolution
High match
Package Type
High match
Channel Count
Not compatible
Sampling Rate
Validation required
Parts at a glance
Part B
AD7928BRUZ
Компания Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5202 ПКС
- Package
- TSSOP-20
- 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 | AD7928BRUZ | AD7923BRUZ | Why it matters |
|---|---|---|---|
| Number of ADC Channels | 8 | 4 | Determines how many analog signals can be sampled; an 8-channel device can replace a 4-channel one only if the extra channels are unused or a multiplexing scheme is acceptable. |
| Resolution | 12 bits | 12 bits | Both provide 12-bit resolution, so measurement precision and LSB size are equivalent, supporting direct substitutability in accuracy-critical designs. |
| Sampling Rate (Throughput) | 1 MSPS | 200 kSPS | The maximum conversion rate limits the bandwidth of signals that can be digitized; the faster AD7928 can handle higher-frequency inputs than the AD7923. |
| Supply Voltage Range | 2.7 V to 5.25 V | 2.7 V to 5.25 V | Identical supply ranges mean both parts can operate from the same system rail without level shifting or regulator changes. |
| Analog Input Type | Single-ended | Single-ended | Both accept single-ended inputs, so the same signal conditioning front-end topology can be reused. |
| Interface | SPI / QSPI / MICROWIRE / DSP compatible | SPI / QSPI / MICROWIRE / DSP compatible | Matching serial interfaces allow the same microcontroller or DSP firmware and pin connections to be used with either device. |
| Package | 20-lead TSSOP | 16-lead TSSOP | Different package footprints and pin counts mean the PCB layout must be redesigned; the parts are not drop-in replacements. |
| Power Consumption (Typical) | 6 mW at 1 MSPS (5 V) | 3.5 mW at 200 kSPS (5 V) | Lower power per conversion affects thermal budget and battery life; the AD7923 consumes less power but at a lower throughput. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical temperature ratings confirm both parts suit the same industrial-grade environmental conditions. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7923BRUZ | AD7928BRUZ |
|---|---|---|
| Part Status | Active | Active |
| Number of Bits | 12 | 12 |
| Sampling Rate(Per Second) | 200k | 1M |
| Number of Inputs | 4 | 8 |
| Input Type | Single Ended | Single Ended |
| Data Interface | SPI, DSP | SPI, DSP |
| Configuration | MUX-S/H-ADC | MUX-S/H-ADC |
| Ratio - S / H: ADC | 1:1 | 1:1 |
| Number of A/D Converters | 1 | 1 |
| Architecture | SAR | SAR |
| Reference Type | External | External |
| Voltage - Supply, Analog | 2.7V ~ 5.25V | 2.7V ~ 5.25V |
| Voltage - Supply, Digital | 2.7V ~ 5.25V | 2.7V ~ 5.25V |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 85°C |
Frequently asked questions
What are the primary differences between the AD7928BRUZ and AD7923BRUZ?
The AD7928BRUZ is an 8-channel, 12-bit successive approximation ADC with a throughput rate of up to 1 MSPS, while the AD7923BRUZ is a 4-channel, 12-bit successive approximation ADC with a throughput rate of up to 200 kSPS. Both are offered in a 20-lead TSSOP package and operate from a 2.7 V to 5.25 V single supply.
Are the AD7928BRUZ and AD7923BRUZ pin-compatible?
No. Although both devices are housed in a 20-lead TSSOP (RU-20) package, they are not pin-compatible. The AD7928BRUZ provides eight analog input channels, whereas the AD7923BRUZ provides four analog input channels, so the pin assignments for the analog inputs and related functions differ between the two devices.
What is the maximum throughput rate of each device?
The AD7928BRUZ supports a maximum throughput rate of 1 MSPS. The AD7923BRUZ supports a maximum throughput rate of 200 kSPS. The throughput difference should be considered when selecting a device for a given sampling requirement.
How many analog input channels does each ADC provide?
The AD7928BRUZ provides eight analog input channels, configurable as single-ended inputs or as pairs in pseudo-differential mode. The AD7923BRUZ provides four analog input channels with the same single-ended and pseudo-differential configuration options.
Do both devices support the same serial interface?
Yes. Both the AD7928BRUZ and AD7923BRUZ use a serial interface compatible with SPI, QSPI, MICROWIRE, and DSP interface standards. This allows either device to be connected to a wide range of host controllers using a standard serial bus.
What is the resolution and supply voltage range for both parts?
Both the AD7928BRUZ and AD7923BRUZ are 12-bit successive approximation ADCs. Both operate from a single supply voltage in the range of 2.7 V to 5.25 V, making them suitable for low-power and mixed-supply system designs.
Can the AD7923BRUZ be used as a drop-in replacement for the AD7928BRUZ?
No. Because the two devices differ in channel count, throughput rate, and pin assignments, the AD7923BRUZ cannot be used as a drop-in replacement for the AD7928BRUZ. Any substitution requires verification against the manufacturer datasheets and validation in the target design.