Overview
The AD7685BRMZRL7 is a 16-bit, successive approximation analog-to-digital converter (ADC) produced by Analog Devices Inc. This ADC is part of the PulSAR® family and is known for its high precision, low power consumption, and versatile interface. It operates from a single power supply between 2.3 V to 5.5 V and is compatible with various digital logic families (1.8 V to 5 V). The AD7685 features an internal conversion clock, a track-and-hold circuit, and a pseudo-differential analog input range from 0 V to VREF, where VREF can be set up to the supply voltage (VDD).
Key Specifications
| Parameter | Value |
|---|---|
| Resolution | 16 bits |
| Throughput | Up to 250 kSPS |
| Integral Nonlinearity (INL) | ±0.6 LSB typical, ±2 LSB maximum |
| Signal-to-Noise and Distortion Ratio (SINAD) | 93.5 dB at 20 kHz |
| Total Harmonic Distortion (THD) | −110 dB at 20 kHz |
| Analog Input Range | 0 V to VREF (up to VDD) |
| Power Supply Range | 2.3 V to 5.5 V |
| Logic Interface Voltage | 1.8 V to 5 V |
| Package Types | 10-Lead MSOP, 10-Lead LFCSP (3mm x 3mm) |
| Operating Temperature Range | −40°C to +85°C |
| Power Dissipation | 1.4 µW at 2.5 V/100 SPS, 1.35 mW at 2.5 V/100 kSPS, 4 mW at 5 V/100 kSPS |
| Standby Current | 1 nA |
Key Features
- No missing codes and high accuracy with ±0.6 LSB typical INL and ±2 LSB maximum INL.
- Internal conversion clock and track-and-hold circuit for precise sampling.
- Pseudo-differential analog input range from 0 V to VREF (up to VDD).
- Single-supply operation with a wide power supply range (2.3 V to 5.5 V) and compatible with 1.8 V to 5 V digital logic families.
- Low power consumption with power dissipation scaling linearly with throughput.
- SPI-compatible serial interface with daisy-chain capability and optional BUSY indicator.
- Compact packaging in 10-lead MSOP or 10-lead LFCSP (3mm x 3mm) for space-saving designs.
- No pipeline delay or latency, making it ideal for multiple multiplexed channel applications.
Applications
The AD7685 is suitable for a variety of applications due to its high precision, low power consumption, and versatile interface. Key applications include:
- Multiplexed channel systems where no pipeline delay or latency is critical.
- Industrial control systems requiring high accuracy and reliability.
- Medical devices that demand precise analog-to-digital conversion.
- Aerospace and defense applications where low power and high performance are essential.
- Automotive systems that require robust and accurate data conversion.
Q & A
- What is the resolution of the AD7685 ADC?
The AD7685 has a 16-bit resolution.
- What is the maximum throughput of the AD7685?
The maximum throughput is up to 250 kSPS.
- What is the typical Integral Nonlinearity (INL) of the AD7685?
The typical INL is ±0.6 LSB.
- What is the power supply range for the AD7685?
The power supply range is from 2.3 V to 5.5 V.
- What types of packages are available for the AD7685?
The AD7685 is available in 10-lead MSOP and 10-lead LFCSP (3mm x 3mm) packages.
- What is the operating temperature range for the AD7685?
The operating temperature range is from −40°C to +85°C.
- How does the power dissipation of the AD7685 scale?
The power dissipation scales linearly with throughput.
- Is the AD7685 compatible with different digital logic families?
Yes, it is compatible with 1.8 V to 5 V digital logic families.
- What is the standby current of the AD7685?
The standby current is 1 nA.
- Does the AD7685 have any pipeline delay or latency?
No, the AD7685 does not exhibit any pipeline delay or latency.
