AD7765 - ADI

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

Part No

AD7765
Manufacturer

ADI
ChipWorker Part#

CW389468709
RoHS

Lead free / RoHS Compliant
Description

24Bit, 156KSPS,112dB ADC, With On-Chip Buffers, Serial Interface
Documentation

Datasheet

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AD7765 Specifications

Attribute	Attribute Value

Part Number	AD7765
Manufacturer	ADI
ChipWorker Part#	CW389468709
Documentation	Datasheet
	expand all
Product Lifecycle Status	Active
RoHS	RoHS Compliant

Product Description

Product Details
The AD7765 is a high performance, 24-bit sigma-delta (Σ-Δ) analog-to-digital converter (ADC). It combines wide input bandwidth, high speed, and performance of 112 dB dynamic range at a 156 kHz output data rate. With excellent dc specifications, the converter is ideal for high speed data acquisition of ac signals where dc data is also required.
Using the AD7765 eases the front-end antialias filtering requirements, simplifying the design process significantly. The AD7765 offers pin-selectable decimation rates of 128× and 256×. Other features include an integrated buffer to drive the reference, as well as a fully differential amplifier to buffer and level shift the input to the modulator.
An overrange alert pin indicates when an input signal has exceeded the acceptable range. The addition of internal gain and internal overrange registers makes the AD7765 a compact, highly integrated data acquisition device requiring minimal peripheral components.
The AD7765 also offers a low power mode, significantly reducing power dissipation without reducing the output data rate or available input bandwidth.
The differential input is sampled at up to 40 MSPS by an analog modulator. The modulator output is processed by a series of low-pass filters. The external clock frequency applied to the AD7765 determines the sample rate, filter corner frequencies, and output word rate.
The AD7765 device boasts a full band on-board FIR filter. The full stop-band attenuation of the filter is achieved at the Nyquist frequency. This feature offers increased protection from signals that lie above the Nyquist frequency being aliased back into the input signal bandwidth.
The reference voltage supplied to the AD7765 determines the input range. With a 4 V reference, the analog input range is ±3.2768 V differential, biased around a common mode of 2.048 V. This common-mode biasing can be achieved using the on-chip differential amplifier, further reducing the external signal conditioning requirements.
The AD7765 is available in a 28-lead TSSOP package and is specified over the industrial temperature range of −40°C to +85°C.
**Applications**
Data acquisition systems
Vibration analysis
Instrumentation
### Features and Benefits
High performance, 24-bit Σ-Δ ADC
115 dB dynamic range at 78 kHz output
data rate
112 dB dynamic range at 156 kHz output
data rate
156 kHz maximum fully filtered output
word rate
|
Pin-selectable oversampling rate
(128× and 256×)
Low power mode
Flexible SPI
Please see data sheet for additional features.
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