Overview
The AD7768-1BCPZ, produced by Analog Devices Inc., is a high-performance, low-power, single-channel Σ-Δ analog-to-digital converter (ADC). It is a single-channel version of the AD7768, an 8-channel, simultaneously sampling Σ-Δ ADC. This device is designed to provide precision conversion of both AC and DC signals, making it an industry standard in combined AC and DC performance. The AD7768-1 is particularly useful for instrumentation and industrial system designers, enabling them to design across multiple measurement variants for both isolated and non-isolated applications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Dynamic Range | 108.5 dB | - |
| Sampling Rate | 256 kSPS | - |
| Input Bandwidth | 110.8 kHz | - |
| Integral Nonlinearity (INL) | ±1.1 ppm | - |
| Offset Error | ±30 µV | - |
| Gain Error | ±30 ppm | - |
| Power Supply Voltages | AVDD1: 4.5 V to 5.5 V, AVDD2: 2.0 V to 5.5 V, IOVDD: 1.8 V to 3.6 V | V |
| Power Supply Current (Fast Mode) | AVDD1: 2.2 mA to 5.1 mA, AVDD2: 4.7 mA to 5.65 mA, IOVDD: 3.35 mA to 11.5 mA | mA |
| Package | 28-Lead LFCSP (4mm x 5mm x 0.75mm) | - |
| Operating Temperature | -40°C to +125°C | °C |
Key Features
- Extensive digital filtering capabilities, including low ripple FIR filter, sinc5 filter, and sinc3 filter for various system requirements.
- Configurable filters for frequency domain measurements, linear phase response, low latency paths, and DC input measurements with line frequency rejection.
- Embedded analog functionality, including precharge buffers on each analog input and full buffer input on the reference, reducing external component requirements.
- High impedance input for the external reference device or reference sense resistor scenarios.
- Low power mode operation from a single 3.0 V rail.
- Programmable decimation and high ODR options for different application needs.
Applications
- Instrumentation systems requiring high precision and dynamic range.
- Industrial measurement systems, including both isolated and non-isolated applications.
- Control loop applications where low latency is critical.
- Custom digital filtering on external FPGAs or DSPs.
- Ratiometric measurements with high accuracy and stability.
Q & A
- What is the dynamic range of the AD7768-1?
The AD7768-1 achieves a dynamic range of 108.5 dB when using the low ripple FIR filter at 256 kSPS.
- What are the power supply voltage requirements for the AD7768-1?
The device operates with AVDD1: 4.5 V to 5.5 V, AVDD2: 2.0 V to 5.5 V, and IOVDD: 1.8 V to 3.6 V. In low power mode, it can run from a single 3.0 V rail.
- What types of digital filters are available on the AD7768-1?
The AD7768-1 offers low ripple FIR filter, sinc5 filter, and sinc3 filter options, each configurable for different system requirements.
- What is the input bandwidth of the AD7768-1 at 256 kSPS?
The input bandwidth is 110.8 kHz when using the low ripple FIR filter at 256 kSPS.
- What is the integral nonlinearity (INL) of the AD7768-1?
The INL is ±1.1 ppm.
- What is the package type and size of the AD7768-1?
The AD7768-1 comes in a 28-Lead LFCSP package with dimensions of 4mm x 5mm x 0.75mm.
- What is the operating temperature range of the AD7768-1?
The operating temperature range is -40°C to +125°C.
- Does the AD7768-1 require an external reference?
Yes, the device requires an external reference with an absolute input reference (REF IN) voltage range of 1 V to AVDD1 − AVSS.
- What are the typical power supply currents for the AD7768-1 in fast mode?
The typical power supply currents are AVDD1: 2.2 mA to 5.1 mA, AVDD2: 4.7 mA to 5.65 mA, and IOVDD: 3.35 mA to 11.5 mA.
- Is there an evaluation board available for the AD7768-1?
Yes, the EV-AD7768-1FMCZ evaluation kit is available for evaluating the features of the AD7768-1.
