Part A
AD7683ARMZ
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 4105 個数
- Package
- MSOP-8
- Series
- データ取得 - アナログ/デジタルコンバータ (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7683ARMZ is a viable functional replacement candidate for the AD7685BRMZRL7 in many precision ADC applications, sharing the same 16-bit SAR architecture, 100 kSPS throughput, and MSOP-8 footprint. However, designers must validate the differential input configuration and the absence of a daisy-chain capable serial interface before committing to a drop-in substitution.
Resolution and Throughput
High match
Package and Pin Configuration
High match
Analog Input Type
Validation required
Serial Interface Features
Validation required
Parts at a glance
Part B
AD7685BRMZRL7
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 4839 個数
- Package
- MSOP-10
- Series
- データ取得 - アナログ/デジタルコンバータ (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 | AD7685BRMZRL7 | AD7683ARMZ | Why it matters |
|---|---|---|---|
| Resolution (bits) | 16 | 16 | Both are 16-bit ADCs, so resolution is equivalent and does not affect substitutability. |
| Sampling Rate (max) | 250 kSPS | 100 kSPS | The AD7685 supports a higher throughput, which matters for faster signal acquisition and higher-bandwidth applications. |
| Number of Input Channels | 1 (single-ended) | 1 (single-ended) | Both are single-channel devices, so channel count is not a differentiator for substitution. |
| Interface Type | SPI / QSPI / MICROWIRE / DSP compatible serial | SPI / QSPI / MICROWIRE / DSP compatible serial | Identical serial interface compatibility means either part can drop into the same digital bus design. |
| Supply Voltage (Analog & Digital) | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Matching supply ranges allow both parts to operate from the same power rails without redesign. |
| Package / Mounting | 10-Lead MSOP (RM), Surface Mount | 8-Lead MSOP (RM), Surface Mount | Different pin counts and footprints mean the PCB layout must be adapted; they are not drop-in footprint compatible. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical temperature ratings ensure both parts suit the same industrial environments. |
| Power Consumption (typical) | ~4 mW at 5 V, 250 kSPS | ~4 mW at 5 V, 100 kSPS | Similar power draw supports comparable thermal and energy budgets, though throughput differs. |
| INL (Integral Nonlinearity, max) | ±1.0 LSB | ±1.0 LSB | Equivalent linearity performance means both deliver comparable accuracy for precision measurement. |
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 | AD7683ARMZ | AD7685BRMZRL7 |
|---|---|---|
| Series | PulSAR® | PulSAR® |
| Part Status | Active | Active |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | 100k | 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 | 2.7V ~ 5.5V | 2.3V ~ 5.5V |
| Voltage - Supply, Digital | 2.7V ~ 5.5V | 2.3V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the key differences between the AD7685BRMZRL7 and the AD7683ARMZ?
The AD7685BRMZRL7 is a 16-bit, 250 kSPS PulSAR analog-to-digital converter, while the AD7683ARMZ is a 16-bit, 100 kSPS PulSAR ADC. Both are successive-approximation register (SAR) ADCs with a pseudo-differential input, but they differ in throughput rate, package, and operating temperature grade. The AD7685BRMZRL7 is supplied in a 10-lead MSOP (RM) and is specified over the -40°C to +85°C industrial temperature range, whereas the AD7683ARMZ is supplied in an 8-lead MSOP (RM) and is specified over the -40°C to +85°C industrial temperature range.
Are the AD7685BRMZRL7 and AD7683ARMZ pin-compatible?
No. The AD7685BRMZRL7 is housed in a 10-lead MSOP package, while the AD7683ARMZ is housed in an 8-lead MSOP package. The two devices have different pin counts and pin functions, so they are not drop-in replacements and require different PCB land patterns.
What is the maximum sampling rate of each device?
The AD7685BRMZRL7 supports a maximum throughput of 250 kSPS. The AD7683ARMZ supports a maximum throughput of 100 kSPS. Both are 16-bit SAR converters, so the AD7685BRMZRL7 offers a higher sampling rate for faster signal acquisition.
Do both ADCs use the same serial interface?
Both devices provide a serial digital output compatible with SPI/QSPI/MICROWIRE/DSP interface standards. However, because the AD7685BRMZRL7 and AD7683ARMZ have different pinouts and package sizes, the interface timing and connection details should be verified against each device's respective datasheet before designing a common interface.
What is the resolution and architecture of these converters?
Both the AD7685BRMZRL7 and the AD7683ARMZ are 16-bit successive-approximation register (SAR) analog-to-digital converters. They provide 16-bit resolution with no pipeline delay, making them suitable for precision measurement and industrial data-acquisition applications.
Can the AD7683ARMZ be used as a lower-speed substitute for the AD7685BRMZRL7?
Only after validating the design against the AD7683ARMZ datasheet. The AD7683ARMZ has a lower maximum throughput (100 kSPS versus 250 kSPS) and a different package and pinout (8-lead MSOP versus 10-lead MSOP). A substitution requires confirming that the reduced sampling rate, interface timing, and PCB layout changes are acceptable for the target application.
What are the input configurations of the AD7685BRMZRL7 and AD7683ARMZ?
Both devices feature a pseudo-differential input configuration, where the input signal is measured with respect to a reference and the negative input is typically tied to a fixed potential. Designers should consult the respective datasheets for the exact input voltage range and reference requirements of each part.