AD7768 - ADI

The pictures are for reference only, and the specific specifications can be found in the product manual.

Part No

AD7768
Manufacturer

ADI
ChipWorker Part#

CW983396709
Description

8Channel, 24Bit, Simultaneous Sampling ADC, Power Scaling, 110.8kHz BW
Documentation

Datasheet

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AD7768 Specifications

Attribute	Attribute Value

Part Number	AD7768
Manufacturer	ADI
ChipWorker Part#	CW983396709
Documentation	Datasheet
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Product Lifecycle Status	Recommended for New Designs

Product Description

Product Details
The AD7768/AD7768-4 are 8-channel and 4-channel, simultaneous sampling sigma-delta (Σ-Δ) analog-to-digital converters (ADCs), respectively, with a Σ-Δ modulator and digital filter per channel, enabling synchronized sampling of ac and dc signals.
The AD7768/AD7768-4 achieve 108 dB dynamic range at a maximum input bandwidth of 110.8 kHz, combined with typical performance of ±2 ppm INL, ±50 µV offset error, and ±30 ppm gain error.
The AD7768/AD7768-4 user can trade off input bandwidth, output data rate, and power dissipation, and select one of three power modes to optimize for noise targets and power consumption. The flexibility of the AD7768/AD7768-4 allows them to become reusable platforms for low power dc and high performance ac measurement modules.
The AD7768/AD7768-4 have three modes: fast mode (256 kSPS maximum, 110.8 kHz input bandwidth, 51.5 mW per channel), median mode (128 kSPS maximum, 55.4 kHz input bandwidth, 27.5 mW per channel) and eco mode (32 kSPS maximum, 13.8 kHz input bandwidth, 9.375 mW per channel).
The AD7768/AD7768-4 offer extensive digital filtering capabilities, such as a wideband, low ±0.005 dB pass-band ripple, antialiasing low-pass filter with sharp roll-off, and 105 dB stop band attenuation at the Nyquist frequency.
Frequency domain measurements can use the wideband linear phase filter. This filter has a flat pass band (±0.005 dB ripple) from dc to 102.4 kHz at 256 kSPS, from dc to 51.2 kHz at 128 kSPS, or from dc to 12.8 kHz at 32 kSPS.
The AD7768/AD7768-4 also offer sinc response via a sinc5 filter, a low latency path for low bandwidth, and low noise measurements. The wideband and sinc5 filters can be selected and run on a per channel basis.
Within these filter options, the user can improve the dynamic range by selecting from decimation rates of ×32, ×64, ×128, ×256, ×512, and ×1024. The ability to vary the decimation filtering optimizes noise performance to the required input bandwidth.
Embedded analog functionality on each ADC channel makes design easier, such as a precharge buffer on each analog input that reduces analog input current and a reference precharge buffer per channel reduces input current and glitches on the reference input terminals.
The device operates with a 5 V AVDD1A and AVDD1B supply, a 2.25 V to 5.0 V AVDD2A and AVDD2B supply, and a 2.5 V to 3.3 V or 1.8 V IOVDD supply (see the 1.8 V IOVDD Operation section for specific requirements for operating at 1.8 V IOVDD). The device requires an external reference; the absolute input reference voltage range is 1 V to AVDD1 − AVSS.
For the purposes of clarity within this document, the AVDD1A and AVDD1B supplies are referred to as AVDD1 and the AVDD2A and AVDD2B supplies are referred to as AVDD2. For the negative supplies, AVSS refers to the AVSS1A, AVSS1B, AVSS2A, AVSS2B, and AVSS pins.
The specified operating temperature range is −40°C to +105°C. The device is housed in a 10 mm × 10 mm 64-lead LQFP package with a 12 mm × 12 mm printed circuit board (PCB) footprint. Throughout this data sheet, multifunction pins, such as XTAL2/MCLK, are referred to either by the entire pin name or by a single function of the pin, for example MCLK, when only that function is relevant.
Applications
Data acquisition systems: USB/PXI/Ethernet
Instrumentation and industrial control loops
Audio test and measurement
Vibration and asset condition monitoring
3-phase power quality analysis
Sonar
High precision medical electroencephalogram (EEG)/electromyography (EMG)/electrocardiogram (ECG)
### Features and Benefits
Precision ac and dc performance
8-/4-channel simultaneous sampling
256 kSPS maximum ADC output data rate per channel
108 dB dynamic range
110.8 kHz maximum input bandwidth (−3 dB bandwidth)
−120 dB total harmonic distortion (THD) typical
±2 ppm of full-scale range (FSR) integral nonlinearity (INL), ±50 µV offset error, ±30 ppm gain error
Optimized power dissipation vs. noise vs. input bandwidth
Selectable power, speed, and input bandwidth (BW) modes
\- Fast: highest speed; 110.8 kHz BW, 51.5 mW per channel
\- Median: half speed, 55.4 kHz BW, 27.5 mW per channel
\- Eco: lowest power, 13.8 kHz BW, 9.375 mW per channel
Input BW range: dc to 110.8 kHz
Programmable input bandwidth/sampling rates
See data sheet for additional features

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