Part A
AD7685BCPZRL7
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 4541 PCS
- Package
- LFCSP-10
- Series
- Acquisition de données - Convertisseur analogique - numérique (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD7683BCPZRL7 is a viable functional replacement candidate for the AD7683BCPZRL7 in many designs, as both are 16-bit, 100 kSPS PulSAR ADCs in the same 10-lead LFCSP package with a serial SPI-compatible interface. However, the AD7685BCPZRL7 offers a faster 250 kSPS throughput and a wider analog input range, so the replacement is only appropriate where the lower sample rate and the AD7683's single-ended input configuration are acceptable. Designers should validate the timing, reference, and input drive requirements before substituting.
Resolution and Throughput
Validation required
Package and Pinout
High match
Analog Input Configuration
Validation required
Digital Interface
High match
Parts at a glance
Part B
AD7683BCPZRL7
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 6888 PCS
- 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 | AD7685BCPZRL7 | AD7683BCPZRL7 | Why it matters |
|---|---|---|---|
| Resolution (bits) | 16 | 16 | Both are 16-bit ADCs, so resolution is identical and not a differentiator for substitutability. |
| Sampling Rate (max) | 250 kSPS | 100 kSPS | The AD7685 supports a higher throughput, which matters for applications needing faster conversion rates. |
| Input Type | Pseudo-differential, single-ended | Differential | Input configuration affects signal conditioning and whether the part can directly replace the other in a given front-end design. |
| Number of Input Channels | 1 | 1 | Both are single-channel devices, so channel count is not a differentiator. |
| Interface | SPI / QSPI / MICROWIRE / DSP compatible serial | SPI / QSPI / MICROWIRE / DSP compatible serial | Identical serial interface simplifies drop-in replacement at the digital interface level. |
| Supply Voltage (analog) | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Same analog supply range means both can operate from common system rails. |
| Package | 10-lead LFCSP (3 mm x 3 mm) | 10-lead LFCSP (3 mm x 3 mm) | Identical package and footprint allow physical board-level interchangeability. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Same temperature range supports use in the same environmental conditions. |
| Power Consumption (typical) | 3.5 mW at 5 V, 250 kSPS | 1.4 mW at 5 V, 100 kSPS | Lower power per conversion in the AD7683 may matter for battery-powered or thermally constrained designs. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7685BCPZRL7 | AD7683BCPZRL7 |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Part Status | Active | Active |
| Series | PulSAR® | - |
| Number of Bits | 16 | - |
| Sampling Rate(Per Second) | 250k | - |
| Number of Inputs | 1 | - |
| Input Type | Pseudo-Differential | - |
| Data Interface | SPI, DSP | - |
| Configuration | S/H-ADC | - |
| Ratio - S / H: ADC | 1:1 | - |
| Number of A/D Converters | 1 | - |
| Architecture | SAR | - |
| Reference Type | External | - |
| Voltage - Supply, Analog | 2.3V ~ 5.5V | - |
| Voltage - Supply, Digital | 2.3V ~ 5.5V | - |
| Operating Temperature | -40°C ~ 85°C | - |
Frequently asked questions
What are the key differences between the AD7685BCPZRL7 and AD7683BCPZRL7?
The AD7685BCPZRL7 is a 16-bit, 250 kSPS PulSAR analog-to-digital converter, while the AD7683BCPZRL7 is a 16-bit, 100 kSPS PulSAR ADC. Both are offered in a 10-lead LFCSP package and operate from a 2.7 V to 5.5 V single supply, but they differ in throughput rate and internal architecture.
Are the AD7685BCPZRL7 and AD7683BCPZRL7 pin-compatible?
Both devices are specified in the same 10-lead LFCSP (CP-10) package, but designers should confirm pin function assignments against the respective manufacturer datasheets before considering a layout-compatible substitution, since the internal configuration and interface timing differ between the two parts.
What is the maximum sampling rate of each device?
The AD7685BCPZRL7 supports a maximum throughput of 250 kSPS, whereas the AD7683BCPZRL7 supports a maximum throughput of 100 kSPS. The higher rate of the AD7685 makes it suitable for faster acquisition applications.
Do both converters use the same serial interface?
Both parts provide a serial digital interface for connection to DSPs, FPGAs, and microcontrollers. However, the exact interface timing, clock requirements, and conversion control differ between the AD7685 and AD7683, so firmware and timing must be validated against the specific datasheet for each device.
What is the resolution and typical application of these ADCs?
Both the AD7685BCPZRL7 and AD7683BCPZRL7 are 16-bit successive-approximation (PulSAR) ADCs. They are typically used in battery-powered instruments, data acquisition systems, medical instrumentation, and industrial process control where 16-bit accuracy is required.
Can the AD7683BCPZRL7 be used as a drop-in replacement for the AD7685BCPZRL7?
Not as a direct drop-in replacement without validation. Although both are 16-bit PulSAR ADCs in a 10-lead LFCSP package, the AD7683 has a lower maximum throughput (100 kSPS vs 250 kSPS) and different interface timing, so system timing, firmware, and signal-chain performance must be re-verified against the AD7683 datasheet.
What supply voltage range do these converters support?
Both the AD7685BCPZRL7 and AD7683BCPZRL7 operate from a single 2.7 V to 5.5 V supply, making them suitable for low-power and mixed-supply systems. Designers should refer to the respective datasheets for detailed supply and reference requirements.