AD7195 4.8 kHz, Ultralow Noise, 24-Bit Sigma-Delta ADC with PGA and AC Excitation
The AD7195 is a low noise, complete analog front end for high precision measurement applications. It contains a low noise, 24-bit sigma-delta (Σ-Δ) analog-to-digital converter (ADC). The on-chip low noise gain stage means that signals of small amplitude can be interfaced directly to the ADC. The AD7195 contains ac excitation, which is used to remove dc-induced offsets from bridge sensors.
The device can be configured to have two differential inputs or four pseudo differential inputs. The on-chip channel sequencer allows several channels to be enabled, and the AD7195 sequentially converts on each enabled channel. This simplifies communication with the part. The on-chip 4.92 MHz clock can be used as the clock source to the ADC or, alternatively, an external clock or crystal can be used. The output data rate from the part can be varied from 4.7 Hz to 4.8 kHz.
The device has two digital filter options. The choice of filter affects the rms noise/noise-free resolution at the programmed output data rate, the settling time, and the 50 Hz/60 Hz rejec-tion. For applications that require all conversions to be settled, the AD7195 includes a zero latency feature.
The part operates with a 5 V analog power supply and a digital power supply from 2.7 V to 5.25 V. It consumes a current of 6 mA. It is housed in a 32-lead LFCSP package.
Applications
- Weigh scales
- Strain gage transducers
- Pressure measurement
- Temperature measurement
Features and Benefits- AC or DC sensor excitation
- RMS noise: 8.5 nV at 4.7 Hz (gain = 128)
- 16 noise-free bits at 2.4 kHz (gain = 128)
- Up to 22.5 noise-free bits (gain = 1)
- Offset drift: 5 nV/°C
- Gain drift: 1 ppm/°C
- Specified drift over time
- 2 differential/4 pseudo differential input channels
- Automatic channel sequencer
- Programmable gain (1 to 128)
- Output data rate: 4.7 Hz to 4.8 kHz
- See data sheet for additional features
| Design Tools |
Data Sheets
Application Notes
| Document | note |
| AN-1131: Chopping on the AD7190, AD7192, AD7193, AD7194, and AD7195 (Rev. 0) | PDF
125 kB |
| AN-1264: Precision Signal Conditioning for High Resolution Industrial Applications (Rev. 0) | PDF
469 kB |
| AN-1084: Channel Switching: AD7190, AD7192, AD7193, AD7194, AD7195 (Rev. 0) | PDF
118 kB |
| AN-1069: Zero Latency for the AD7190, AD7192, AD7193, AD7194, and AD7195 (Rev. 0) | PDF
82 kB |
User Guides
Frequently Asked Questions
Order Information
| Part Number | Package | Packing Qty | Temp Range | Price 100-499 | Price 1000+ | RoHS |
|---|
| AD7195BCPZ Production | 32 ld LFCSP (5x5x.85mm) w/3.5exposed pad | OTH 490 | -40 to 105C | 8.1 | 6.9 | Y |
| AD7195BCPZ-RL Production | 32 ld LFCSP (5x5x.85mm) w/3.5exposed pad | REEL 5000 | -40 to 105C | 0 | 6.9 | Y |
| AD7195BCPZ-RL7 Production | 32 ld LFCSP (5x5x.85mm) w/3.5exposed pad | REEL 1500 | -40 to 105C | 0 | 6.9 | Y |
Evaluation Boards
| Part Number | Description | Price | RoHS |
|---|
| EVAL-AD7195EBZ | Evaluation Board | 59 | Y |
Reference Materials
