Part A
AD7685BRMZRL7
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4839 PCS
- Package
- MSOP-10
- Series
- Data Acquisition - Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7685ARMZRL7 and AD7685BRMZRL7 are functionally interchangeable 16-bit PulSAR ADCs sharing identical package, pinout, and core specifications, with the BRMZRL7 grade offering tighter guaranteed linearity and accuracy. The ARMZRL7 can serve as a drop-in substitute where the relaxed INL and AC performance tolerances are acceptable, while the BRMZRL7 is the preferred choice for precision applications requiring tighter specifications.
Resolution and Architecture
High match
Package and Pinout
High match
Linearity and Accuracy Grade
Validation required
Supply and Interface
High match
Parts at a glance
Part B
AD7685ARMZRL7
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 1265 PCS
- Package
- MSOP-10
- Series
- Data Acquisition - 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 | AD7685ARMZRL7 | AD7685BRMZRL7 | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 16 bit | Both are 16-bit ADCs, so resolution is identical and does not affect substitutability. |
| Sampling Rate | 250 kSPS | 250 kSPS | Identical throughput means either part supports the same signal bandwidth and timing budget. |
| INL (Integral Nonlinearity) | ±1.5 LSB max | ±0.6 LSB max | The B-grade offers tighter linearity, giving better accuracy; the A-grade may not meet precision requirements where B-grade is specified. |
| DNL (Differential Nonlinearity) | ±1.0 LSB max | ±0.6 LSB max | Better DNL in the B-grade ensures no missing codes and improved monotonicity for demanding applications. |
| Transition Noise | 0.5 LSB rms typ | 0.3 LSB rms typ | Lower transition noise in the B-grade improves effective resolution and SNR performance. |
| Supply Voltage (VDD) | 2.3 V to 5.5 V | 2.3 V to 5.5 V | Identical supply range allows either part to operate in the same power domain without redesign. |
| Interface | SPI / QSPI / MICROWIRE / DSP compatible | SPI / QSPI / MICROWIRE / DSP compatible | Same serial interface ensures drop-in compatibility with existing digital host connections. |
| Package | 10-Lead MSOP | 10-Lead MSOP | Identical package and pinout allow direct PCB substitution without layout changes. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Same temperature range means both parts suit the same environmental conditions. |
| Power Consumption | 3.5 mW typ at 5 V, 250 kSPS | 3.5 mW typ at 5 V, 250 kSPS | Identical power consumption means no thermal or power budget impact when substituting. |
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Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7685BRMZRL7 | AD7685ARMZRL7 |
|---|---|---|
| Series | PulSAR® | PulSAR® |
| Part Status | Active | Active |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | 250k | 250k |
| Number of Inputs | 1 | 1 |
| Input Type | Pseudo-Differential | Pseudo-Differential |
| 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 | External |
| Voltage - Supply, Analog | 2.3V ~ 5.5V | 2.3V ~ 5.5V |
| Voltage - Supply, Digital | 2.3V ~ 5.5V | 2.3V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What is the primary difference between the AD7685ARMZRL7 and the AD7685BRMZRL7?
The primary difference is the specified integral nonlinearity (INL) grade. The AD7685BRMZRL7 offers a maximum INL of ±1.0 LSB, while the AD7685ARMZRL7 offers a maximum INL of ±2.0 LSB. Both are 16-bit, 250 kSPS PulSAR analog-to-digital converters in a 10-lead MSOP package.
Are the AD7685ARMZRL7 and AD7685BRMZRL7 pin-compatible and package-compatible?
Yes. Both devices are offered in the same 10-lead MSOP (RM) package with identical pin functions, allowing them to share the same PCB footprint and land pattern.
Do both parts support the same serial interface and throughput?
Yes. Both the AD7685ARMZRL7 and AD7685BRMZRL7 provide a SPI/QSPI/MICROWIRE/DSP-compatible serial interface and operate at a maximum throughput of 250 kSPS.
Can the AD7685ARMZRL7 be used as a drop-in replacement for the AD7685BRMZRL7?
In many applications yes, because the package, pinout, interface, and throughput are identical. However, the replacement is only acceptable if the system's accuracy budget tolerates the wider ±2.0 LSB maximum INL of the A-grade device instead of the ±1.0 LSB maximum INL of the B-grade device.
What is the resolution and sampling rate of these AD7685 variants?
Both the AD7685ARMZRL7 and AD7685BRMZRL7 are 16-bit successive-approximation register (SAR) ADCs with a maximum sampling rate of 250 kSPS.
Do both devices operate from the same supply voltage?
Yes. Both variants operate from a single 2.7 V to 5.5 V analog and digital supply, with a separate VIO pin for digital interface flexibility.
What does the RL7 suffix indicate on both part numbers?
The RL7 suffix indicates tape-and-reel packaging in a 7-inch reel, which applies to both the AD7685ARMZRL7 and AD7685BRMZRL7.