Part A
AD7685CRMZ
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 5270 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)
Replacement verdict
Compatible functional replacement candidate
The AD7685ARMZRL7 and AD7685CRMZ are functionally interchangeable 16-bit PulSAR ADCs sharing the same core architecture, resolution, and MSOP-10 footprint, making them a viable replacement candidate. The primary distinction lies in their specified operating temperature grades, so the appropriate part should be selected based on the target application's thermal environment.
Resolution and Architecture
High match
Package and Pinout
High match
Operating Temperature Range
Validation required
Supply Voltage and Interface
High match
Parts at a glance
Part B
AD7685ARMZRL7
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 1265 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 | AD7685ARMZRL7 | AD7685CRMZ | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 16 bit | Both converters provide the same 16-bit resolution, so measurement precision is equivalent. |
| Sampling Rate | 250 kSPS | 250 kSPS | Identical throughput means either part supports the same signal bandwidth and update rate. |
| Number of Inputs / Channels | 1 (single-ended) | 1 (single-ended) | Same single-channel architecture allows direct substitution in single-sensor designs. |
| Input Type | Single-ended, pseudo-differential | Single-ended, pseudo-differential | Matching input configuration ensures the same analog front-end and reference scheme can be reused. |
| Interface | SPI / DSP serial (QSPI, MICROWIRE, DSP) | SPI / DSP serial (QSPI, MICROWIRE, DSP) | Identical serial interface means the same digital host and firmware can drive either device. |
| Supply Voltage (Analog & Digital) | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Same supply range allows operation from the same rail without redesigning power delivery. |
| Package / Mounting | 10-lead MSOP (RM), surface mount | 10-lead MSOP (RM), surface mount | Same package and footprint enable drop-in board replacement without layout changes. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Equivalent temperature ratings mean both parts suit the same environmental conditions. |
| Packaging / Ordering Format | Tape and reel (RL7 suffix) | Tube / tray (no reel suffix) | Different shipping formats affect automated assembly line feeding and inventory handling, though the die is functionally the same. |
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 | AD7685CRMZ | 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 are the key differences between the AD7685ARMZRL7 and the AD7685CRMZ?
Both parts are 16-bit, 250 kSPS PulSAR analog-to-digital converters from Analog Devices. The AD7685ARMZRL7 is supplied in a 10-lead MSOP package and is provided in tape-and-reel format (RL7 suffix), while the AD7685CRMZ is supplied in a 10-lead LFCSP package. The core ADC specifications, including resolution, throughput, and interface, are the same across both orderable variants.
Are the AD7685ARMZRL7 and AD7685CRMZ electrically interchangeable?
Functionally, both devices provide the same 16-bit, 250 kSPS conversion performance and use the same serial interface. However, because they use different package types (MSOP vs. LFCSP), the PCB land patterns and thermal characteristics differ, so they are not drop-in replacements without a board redesign.
What is the resolution and throughput of the AD7685ARMZRL7 and AD7685CRMZ?
Both devices are 16-bit successive-approximation register (SAR) ADCs with a maximum throughput of 250 kSPS. These parameters are common to the AD7685 family and are verified in the Analog Devices datasheet.
What analog input configuration do the AD7685ARMZRL7 and AD7685CRMZ support?
Both parts feature a pseudo-differential analog input with a single-ended input range of 0 V to VREF, where VREF is externally applied. The devices operate from a single 2.7 V to 5.5 V supply and include an internal reference buffer option.
What digital interface do the AD7685ARMZRL7 and AD7685CRMZ use?
Both devices use a SPI-compatible serial interface (3-wire or 4-wire) supporting daisy-chain and busy-indicator modes. The interface logic level is set by the VIO supply pin, allowing direct connection to 1.8 V, 2.5 V, 3 V, or 5 V logic.
Do the AD7685ARMZRL7 and AD7685CRMZ differ in operating temperature range?
Both orderable variants are specified over the industrial temperature range of −40 °C to +85 °C, as stated in the Analog Devices datasheet for the AD7685 family.
Which package should be selected between the AD7685ARMZRL7 and AD7685CRMZ?
Package selection depends on board space and assembly requirements. The AD7685ARMZRL7 uses a 10-lead MSOP, which is suitable for standard leaded SMT assembly, while the AD7685CRMZ uses a 10-lead LFCSP, which offers a smaller footprint and improved thermal performance for space-constrained designs.
Are the AD7685ARMZRL7 and AD7685CRMZ RoHS compliant?
Both the AD7685ARMZRL7 and AD7685CRMZ carry the "Z" suffix in their part numbers, which denotes RoHS-compliant, lead-free construction per Analog Devices ordering nomenclature. Designers should confirm current compliance status against the manufacturer's product page before final qualification.