Part A
AD7327BRUZ
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 3453 PCS
- Package
- TSSOP-20
- Series
- Acquisition de données - Convertisseur analogique - numérique (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7322BRUZ and AD7327BRUZ share the same TSSOP-20 footprint, 12-bit SAR architecture, and 1 MSPS throughput, making the AD7327BRUZ a viable functional upgrade path where additional input channels are required. However, the differing channel count and software-configurable input range structure require schematic and firmware validation before substitution.
Package Type
High match
Resolution
High match
Channel Count
Validation required
Input Range Configuration
Validation required
Parts at a glance
Part B
AD7322BRUZ
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 4528 PCS
- Package
- TSSOP-14
- 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 | AD7322BRUZ | AD7327BRUZ | Why it matters |
|---|---|---|---|
| Number of ADC Channels | 2 | 8 | Channel count determines how many analog signals can be sampled; a 2-channel part cannot directly replace an 8-channel part in multi-signal systems. |
| Resolution | 12 bit plus sign (13-bit) | 12 bit plus sign (13-bit) | Resolution sets the smallest measurable signal change; both offer 13-bit effective resolution, so measurement precision is comparable. |
| Input Type | Single-ended / differential (software selectable) | Single-ended / differential (software selectable) | Flexible input configuration allows the same device to interface with either single-ended or differential sensors, affecting system compatibility. |
| Input Voltage Range | ±10 V, ±5 V, ±2.5 V, 0 to +10 V (selectable) | ±10 V, ±5 V, ±2.5 V, 0 to +10 V (selectable) | Bipolar and unipolar ranges allow direct connection to industrial signals without external conditioning, preserving accuracy. |
| Throughput Rate | 1 MSPS | 500 kSPS | Maximum sampling rate limits the bandwidth of signals that can be captured; the AD7322 supports twice the throughput of the AD7327. |
| Interface | SPI / QSPI / MICROWIRE / DSP compatible serial | SPI / QSPI / MICROWIRE / DSP compatible serial | Serial interface compatibility ensures the device can connect to the host controller without additional glue logic. |
| Supply Voltage | 2.7 V to 5.25 V (VDD), ±5 V to ±16.5 V (VSS) | 2.7 V to 5.25 V (VDD), ±5 V to ±16.5 V (VSS) | Supply requirements determine power rail compatibility; identical rails allow drop-in substitution from a power perspective. |
| Package | 20-lead TSSOP | 20-lead TSSOP | Package footprint affects PCB layout; matching packages simplify board redesign when swapping parts. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Temperature range confirms suitability for industrial environments; identical ratings mean equivalent environmental robustness. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7327BRUZ | AD7322BRUZ |
|---|---|---|
| Series | iCMOS® | iCMOS® |
| Part Status | Active | Active |
| Number of Bits | 12 | 12 |
| Sampling Rate(Per Second) | 500k | 1M |
| Number of Inputs | 2, 3, 4 | 1, 2 |
| Input Type | Differential, Pseudo-Differential, Single Ended | Differential, Pseudo-Differential, 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, Internal | External, Internal |
| Voltage - Supply, Analog | ±12V ~ 16.5V | ±12V ~ 16.5V |
| Voltage - Supply, Digital | 2.7V ~ 5.25V | 2.7V ~ 5.25V |
| Features | Temperature Sensor, True Bipolar | True Bipolar |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the key architectural differences between the AD7322BRUZ and AD7327BRUZ?
The AD7322BRUZ is a 2-channel, 12-bit plus sign successive approximation ADC, while the AD7327BRUZ is an 8-channel, 12-bit plus sign successive approximation ADC. Both devices feature a bipolar input range and are based on the same iCMOS core architecture, but the AD7327BRUZ provides six additional input channels and includes a channel sequencer for multi-channel scanning.
Do the AD7322BRUZ and AD7327BRUZ support the same input voltage ranges?
Yes. Both devices support software-selectable input ranges of ±10 V, ±5 V, ±2.5 V, and 0 V to +10 V, with a 12-bit plus sign resolution that provides a ±13-bit bipolar coding scheme. The input range selection is configured through the SPI-compatible serial interface on both parts.
Are the AD7322BRUZ and AD7327BRUZ pin-compatible or package-compatible?
No. Both devices are offered in a 20-lead TSSOP (RU-20) package, but the pin functions differ because the AD7327BRUZ exposes eight analog input channels plus additional control pins, whereas the AD7322BRUZ uses the same package footprint for only two analog inputs and different digital pin assignments. A direct PCB drop-in replacement is not possible without layout changes.
What is the maximum throughput rate of each device?
Both the AD7322BRUZ and AD7327BRUZ offer a maximum throughput rate of 1 MSPS. The AD7327BRUZ achieves this rate when using the channel sequencer, while the AD7322BRUZ achieves 1 MSPS on its two channels. Throughput is dependent on the serial clock frequency and the selected input range.
Do both parts use the same digital interface?
Yes. Both devices use a SPI-compatible serial interface supporting clock frequencies up to 20 MHz, with separate DOUT and DIN lines and a dedicated CONVST signal. The AD7327BRUZ additionally supports a channel sequencer and shadow register functionality accessible through the same serial interface.
How do the power supply requirements compare between the AD7322BRUZ and AD7327BRUZ?
Both devices operate from a single VDD supply of 2.7 V to 5.25 V for the digital and analog core, with a separate VSS supply of −16.5 V to −2.5 V (or 0 V for unipolar operation) and a VCC supply of 2.7 V to 16.5 V for the analog input range. Power consumption scales with throughput and is comparable between the two parts at equivalent sampling rates.
Which device should be selected for a multi-channel bipolar data acquisition system?
The AD7327BRUZ is the appropriate choice for multi-channel systems because it provides eight analog input channels with a built-in channel sequencer, allowing automatic scanning of multiple channels without per-channel SPI commands. The AD7322BRUZ is better suited to two-channel applications where board space and minimal channel count are priorities.