AD7768-4BSTZ Simultaneous Sampling A/D Converters by Analog Devices

Status: Production
Series: AD7768-4
RoHS: Compliant
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The AD7768/AD7768-4 are 8-channel and 4-channel 24-bit, simultaneous sampling, sigma-delta (Σ-Δ) analog-to-digital converters (ADCs) with power scaling and 110.8 kHz bandwidth. The devices have a Σ-Δ modulator and digital filter per channel, which enables synchronized sampling of ac and dc signals.The AD7768/AD7768-4 achieve 108 dB dynamic range at amaximum input bandwidth of 110.8 kHz, combined with typicalperformance of ±2 ppm integral nonlinearity (INL), ±50 μVoffset 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 threepower 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 highperformance 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 low power mode (32 kSPS maximum, 13.8 kHz input bandwidth, 9.375 mW per channel).The AD7768/AD7768-4 offer extensive digital filteringcapabilities, such as a wideband, low ±0.005 dB pass-bandripple, antialiasing low-pass filter with sharp roll-off, and 105 dB 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 noisemeasurements. The wideband and sinc5 filters can be selected and run on a per channel basis. Within these filter options, the user can improve the dynamicrange 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 inputbandwidth.Embedded analog functionality on each ADC channel makesdesign easier, such as a precharge buffer on each analog inputthat reduces analog input current and a precharge reference buffer per channel reduces input current and glitches on thereference 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 Operationsection for specific requirements for operating at 1.8 V IOVDD).The device requires an external reference; the absolute inputreference voltage range is 1 V to AVDD1 − AVSS.The specified operating temperature range is −40°C to +105°C. The device is housed in a 10 mm × 10 mm, 64-lead low profile quad flat package (LQFP) with a 12 mm × 12 mm printed circuit board (PCB) footprint.

Prices starting from US$16.84


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Logo for Analog Devices Analog Devices US$24.57
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Logo for Farnell Farnell US$21.15
221
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Logo for Newark Electronics Newark Electronics US$16.84
221
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Logo for element14 element14 US$22.22
221
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Logo for Chip One Stop Chip One Stop US$22.00
34
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Logo for Richardson RFPD Richardson RFPD US$18.72
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Features

Precision ac and dc performance
8-/4-channel simultaneous sampling
256 kSPS maximum ADC ODR per channel
108 dB dynamic range
110.8 kHz maximum input bandwidth (−3 dB BW)
−120 dB THD, typical
±2 ppm of full-scale range (FSR) integral nonlinearity (INL), ±50 μV offset error, ±30 ppm of FSR gain error
Optimized power dissipation vs. noise vs. input bandwidth
Selectable power, speed, and input bandwidth
Fast (highest speed): 110.8 kHz BW, 51.5 mW per channel
Median (half speed): 55.4 kHz BW, 27.5 mW per channel
Low power (lowest power): 13.8 kHz BW, 9.375 mW per channel
Per channel digital filter
Programmable input bandwidth/sampling rates
CRC error checking on data interface
Daisy-chaining
Linear phase digital filter
Low latency sinc5 filter
Wideband brick wall filter: ±0.005 dB ripple to 102.4 kHz
Analog input precharge buffers
Power supply
AVDD1 = 5.0 V, AVDD2 = 2.25 V to 5.0 V
IOVDD = 2.5 V to 3.3 V or IOVDD = 1.8 V
64-lead LQFP package, no exposed pad
Temperature range: −40°C to +105°C

Alternative Descriptions

256ksps 4 ch wideband 24B SD-A | Analog Devices
ADC, 24BIT, 256KSPS, LQFP-64 | Farnell
Adc, 24Bit, 256Ksps, Lqfp-64 | Newark Electronics
CONVERTER - ADC | Richardson RFPD


Frequently Asked Questions

Where can I find additional details, specifications and documents for a AD7768-4BSTZ?

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What category does AD7768-4BSTZ fall under?

The AD7768-4BSTZ is listed under Simultaneous Sampling A/D Converters.

Can I view similar or alternative parts?

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Is the AD7768-4BSTZ RoHS compliant?

Yes. This part has been flagged as RoHS Compliant by Analog Devices.

Which authorised distributors for AD7768-4BSTZ have stock available?

Authorised distributors including Analog Devices, Farnell, Newark Electronics, element14 and Chip One Stop have stock available or on a lead time for AD7768-4BSTZ.

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