Part A
AD7683BRMZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5609 Stückzahl
- Package
- MSOP-8
- Series
- Datenerfassung mit Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7683BRMZ and AD7680ARM are both 16-bit successive-approximation ADCs offered in 8-lead MSOP packages with serial SPI-compatible interfaces, making them a viable functional replacement pairing for many precision conversion applications. However, the AD7683BRMZ provides a pseudo-differential input with a 100 kSPS throughput rate, while the AD7680ARM offers a single-ended input with a faster 200 kSPS throughput rate, so designers must validate input configuration and timing margins against the target system requirements before substituting one for the other.
Resolution
High match
Package Type
High match
Input Configuration
Validation required
Throughput Rate
Validation required
Parts at a glance
Part B
AD7680ARM
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3762 Stückzahl
- Package
- TSSOP-8
- Series
- Datenerfassung mit Analog to Digital Converters (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 | AD7683BRMZ | AD7680ARM | Why it matters |
|---|---|---|---|
| Resolution | 16 bits | 16 bits | Both are 16-bit ADCs, so resolution is equivalent and does not differentiate substitutability. |
| Sampling Rate | 100 kSPS | 100 kSPS | Identical throughput means either part can meet the same sampling requirements. |
| Architecture | SAR | SAR | Both use successive-approximation register architecture, giving similar latency and no pipeline delay. |
| Input Type | Pseudo-differential, single-ended | Single-ended | The AD7683 supports pseudo-differential inputs, which can reject common-mode noise, while the AD7680 is single-ended only. |
| Supply Voltage | 2.7 V to 5.5 V | 2.5 V to 5.5 V | The AD7680 operates down to 2.5 V, allowing use in lower-voltage systems where the AD7683 would not function. |
| Interface | SPI / QSPI / MICROWIRE / DSP compatible | SPI / QSPI / MICROWIRE / DSP compatible | Both offer the same serial interface options, so board-level digital connectivity is interchangeable. |
| Package | 10-lead MSOP | 8-lead MSOP | Different pin counts and footprints mean the parts are not drop-in replacements on an existing PCB layout. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical temperature ratings mean both suit the same industrial environments. |
| Power Consumption | 4 mW typical at 5 V, 100 kSPS | 3.5 mW typical at 5 V, 100 kSPS | The AD7680 draws slightly less power, which can matter in low-power or battery-operated designs. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7683BRMZ | AD7680ARM |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| Series | PulSAR® | PulSAR® |
| Part Status | Active | Obsolete |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | 100k | 100k |
| Number of Inputs | 1 | 1 |
| Input Type | Pseudo-Differential | Single Ended |
| Data Interface | SPI, DSP | SPI, DSP |
| Configuration | S/H-ADC | S/H-ADC |
| Ratio - S / H: ADC | 1:1 | 1:1 |
| Number of A/D Converters | 1 | 1 |
| Architecture | SAR | SAR |
| Reference Type | External | Supply |
| Voltage - Supply, Analog | 2.7V ~ 5.5V | 2.5V ~ 5.5V |
| Voltage - Supply, Digital | 2.7V ~ 5.5V | 2.5V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the key differences between the AD7683BRMZ and the AD7680ARM?
The AD7683BRMZ is a 16-bit, 100 kSPS PulSAR analog-to-digital converter with a pseudo-differential input, SPI-compatible serial interface, and an external reference, housed in a 10-lead MSOP. The AD7680ARM is a 16-bit, 100 kSPS successive-approximation ADC with a single-ended input, SPI/QSPI/MICROWIRE/DSP-compatible interface, and an internal reference, housed in an 8-lead MSOP. Key differences include input configuration (pseudo-differential vs single-ended), reference architecture (external vs internal), and package pin count (10-lead vs 8-lead).
Are the AD7683BRMZ and AD7680ARM pin-compatible?
No. The AD7683BRMZ is supplied in a 10-lead MSOP, while the AD7680ARM is supplied in an 8-lead MSOP. The differing pin counts and pin functions mean they are not drop-in replacements and require different PCB land patterns.
Do both parts offer the same resolution and throughput?
Yes. Both the AD7683BRMZ and the AD7680ARM are 16-bit successive-approximation ADCs specified for a maximum throughput of 100 kSPS, making them comparable in resolution and sampling rate for low-speed precision applications.
How do the reference requirements differ between the two devices?
The AD7683BRMZ requires an external reference voltage applied to its REF pin, allowing the system designer to set the full-scale range. The AD7680ARM integrates an internal reference, simplifying the external circuit but fixing the reference value per the datasheet. Designs migrating between the two must account for this reference architecture difference.
What input configurations do the AD7683BRMZ and AD7680ARM support?
The AD7683BRMZ provides a pseudo-differential input structure, which allows rejection of common-mode signals between the IN+ and IN- inputs. The AD7680ARM provides a single-ended input referenced to ground. This difference affects signal conditioning and common-mode noise performance in the target design.
Are the serial interfaces of the AD7683BRMZ and AD7680ARM compatible with common digital hosts?
Both devices use SPI-compatible serial interfaces. The AD7683BRMZ supports a 3-wire or 4-wire SPI interface, while the AD7680ARM is specified as compatible with SPI, QSPI, MICROWIRE, and DSP interface standards. Both can interface with most microcontrollers and DSPs, but timing and framing details should be verified against each datasheet.
Can the AD7683BRMZ and AD7680ARM operate from the same supply voltage?
Both devices are specified for single-supply operation in the 2.7 V to 5.5 V range, per their respective manufacturer datasheets. This overlapping supply range allows both parts to be used in 3 V or 5 V systems, though the external reference requirement of the AD7683BRMZ must be considered separately.