Overview
The AD7768BSTZ, produced by Analog Devices Inc., is an 8-channel, 24-bit, simultaneous sampling sigma-delta (Σ-Δ) analog-to-digital converter (ADC). This device is designed for high-performance measurements, offering flexibility in power modes and extensive digital filtering capabilities. It is suitable for both low power DC and high-performance AC measurement applications. The AD7768BSTZ features a dynamic range of 108 dB at a maximum input bandwidth of 110.8 kHz, along with low noise and high accuracy specifications such as ±2 ppm integral nonlinearity (INL), ±50 μV offset error, and ±30 ppm gain error.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Number of Channels | 8 | - |
| Resolution | 24-bit | - |
| Sampling Mode | Simultaneous Sampling | - |
| Maximum Input Bandwidth | 110.8 kHz | kHz |
| Dynamic Range | 108 dB | dB |
| Integral Nonlinearity (INL) | ±2 ppm | ppm |
| Offset Error | ±50 μV | μV |
| Gain Error | ±30 ppm | ppm |
| Power Modes | Fast, Median, Low Power | - |
| Maximum Sampling Rates | 256 kSPS (Fast), 128 kSPS (Median), 32 kSPS (Low Power) | kSPS |
| Power Consumption per Channel | 51.5 mW (Fast), 27.5 mW (Median), 9.375 mW (Low Power) | mW |
| Operating Temperature Range | −40°C to +105°C | °C |
| Package Type | 64-Lead LQFP (10mm x 10mm) | - |
Key Features
- Extensive Digital Filtering: The AD7768BSTZ offers wideband, low ±0.005 dB pass-band ripple, antialiasing low-pass filters with sharp roll-off, and 105 dB attenuation at the Nyquist frequency. It also includes sinc response via a sinc5 filter for low latency and low noise measurements.
- Power Scaling: The device has three power modes (Fast, Median, Low Power) allowing users to trade off input bandwidth, output data rate, and power dissipation to optimize for noise targets and power consumption.
- Embedded Analog Functionality: Each ADC channel includes a precharge buffer on each analog input to reduce analog input current and a reference precharge buffer per channel to reduce input current and glitches on the reference input terminals.
- Flexible Filter Options: The wideband and sinc5 filters can be selected and run on a per channel basis, and the user can improve the dynamic range by selecting from various decimation rates.
Applications
The AD7768BSTZ is versatile and can be used in various applications, including:
- High-Performance AC Measurements: Suitable for applications requiring high accuracy and low noise in AC signal measurements.
- Low Power DC Measurements: Ideal for low power DC measurement modules where power consumption is a critical factor.
- Industrial Automation: Can be used in industrial automation systems that require precise and simultaneous sampling of multiple channels.
- Medical Devices: Applicable in medical devices that need high-resolution and low-noise ADCs for accurate signal processing.
Q & A
- What is the resolution of the AD7768BSTZ ADC?
The AD7768BSTZ has a resolution of 24 bits.
- What are the different power modes available on the AD7768BSTZ?
The device has three power modes: Fast, Median, and Low Power.
- What is the maximum input bandwidth of the AD7768BSTZ?
The maximum input bandwidth is 110.8 kHz.
- What type of filters does the AD7768BSTZ offer?
The device offers wideband linear phase filters and sinc5 filters.
- What is the operating temperature range of the AD7768BSTZ?
The operating temperature range is −40°C to +105°C.
- How many channels does the AD7768BSTZ have?
The AD7768BSTZ has 8 channels.
- What is the dynamic range of the AD7768BSTZ?
The dynamic range is 108 dB.
- Can the filters be selected on a per channel basis?
Yes, the wideband and sinc5 filters can be selected and run on a per channel basis.
- What are the typical power consumption values for each power mode?
The power consumption is approximately 51.5 mW per channel in Fast mode, 27.5 mW per channel in Median mode, and 9.375 mW per channel in Low Power mode.
- What type of package does the AD7768BSTZ come in?
The device is housed in a 64-Lead LQFP (10mm x 10mm) package.
