The AD7785 is a low power, low noise, complete analog front ends for high precision measurement applications. It contains a low noise 20-bit Σ-Δ ADC with three differential analog inputs. The on-chip, low noise instrumentation amplifier means that signals of small amplitude can be interfaced directly to the ADC. With a gain setting of 64, the rms noise is 40 nV when the update rate equals 4.17 Hz.
The device contains a precision low noise, low drift internal band gap reference and can also accept an external differential reference. Other on-chip features include programmable excitation current sources, burnout currents, and a bias voltage generator, the bias voltage generator being used to set the common-mode voltage of a channel to AVDD/2.
The device can be operated with either the internal clock or an external clock. The output data rate from the part is software-programmable and can be varied from 4.17 Hz to 470 Hz.
The part operates with a power supply from 2.7 V to 5.25 V. It consumes a current of 400 µA typical and is housed in 16-lead TSSOP packages.
Features and Benefits
| Analog to Digital ConvertersDesign Tools |
| Document | note |
| AD7785: 3-Channel, Low Noise, Low Power, 20-Bit Σ-Δ ADC with On-Chip In-Amp and Reference Data Sheet (Rev. 0) | PDF 629 kB |
| Part Number | Package | Packing Qty | Temp Range | Price 100-499 | Price 1000+ | RoHS |
|---|---|---|---|---|---|---|
| AD7785BRUZ Production | 16 ld TSSOP | OTH 96 | -40 to 105C | 5.01 | 4.25 | Y |
| AD7785BRUZ-REEL Production | 16 ld TSSOP | REEL 2500 | -40 to 105C | 0 | 4.25 | Y |
| Part Number | Description | Price | RoHS |
|---|---|---|---|
| EVAL-AD7785EBZ | Evaluation Board | 59 | Y |
