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特性
- Precision AC and DC performance
- Noise RTI 5.5 nV/√Hz (gain = 128)
- INL: ±0.5 ppm of FSR
- SNR 110 dB typical (VREF = 4.096 V, gain = 1 precharge, sinc5 filter)
- THD: −120 dB typical
- Crosspoint multiplexed analog inputs
- 4 differential/8 pseudodifferential inputs
- Overvoltage/undervoltage tolerant on inactive analog inputs
- Channel scan data rate of 71.4 kSPS/channel (14 μs settling)
- Ultra-low noise integrated PGA, gains of 0.5 to 128
- Output data rate: 7.6 SPS to 500 kSPS
- Flexible digital filters
- Low ripple FIR: ±0.005 dB maximum pass-band ripple
- User programmable FIR filter options
- Low latency sinc filters
- Simultaneous 50 Hz/60 Hz rejection
- Band gap reference with 5 ppm/°C drift typical
- Internal oscillator and temperature sensor
- Analog power supply: 4.75 V to 5.25 V or ±2.5 V
- Digital power supply: 1.7 V to 5.25 V
- Matched programmable excitation current sources
- Low-side power switches
- AC excitation
- On-chip bias voltage generator
- 4 general-purpose inputs/outputs
- Internal and system calibration
- Sensor burnout detection
- Diagnostic functions
- Per channel configuration
- Flexible channel sequencer
- 3- or 4-wire serial interface
- Schmitt trigger on SCLK
- Programmable gain amplifier (PGA). Due to the programmable gain (0.5 to 128), the PGA allows direct interfacing to transducers with low output amplitudes such as resistive bridges, thermocouples, and resistance temperature detectors (RTDs).
- The PGA has a wide common-mode input range, giving designers greater margin for widely varying input common modes.
- Low drift, well matched precision current sources. Excitation current sources can be used to excite 2-, 3-, and 4-wire RTDs or bridge type sensors. Excitation current output options include 10 μA, 50 μA, 100 μA, 250 μA, 500 μA, 1 mA, and 1.5 mA. The currents can also be added if higher currents are needed. The currents are made up of two pairs with the pairs optimized for matching and drift matching.
- The low-side power switch (PDSW) can be used to power down bridge sensors between conversions.
- Voltage bias for thermocouples (the VBIAS source sets the common-mode voltage of a channel to (AVDD + AVSS)/2.
- The smart sequencer allows the conver
产品详情和应用
The AD4170-4 is a DC to 50 kHz input bandwidth, low noise, high speed, completely integrated analog front end for high precision measurement applications. The AD4170-4 offers output data rates from 7.6 SPS up to 500 kSPS. The device contains a low noise, 24-bit Σ-Δ analog-to-digital converter (ADC), and can be configured to have four differential inputs or eight single-ended or pseudodifferential inputs. The on-chip low noise gain stage ensures that signals of small amplitude can be interfaced directly to the AD4170-4.
The AD4170-4 offers the highest degree of signal chain integration. The device contains an internal reference and accepts two external differential references, which can be internally buffered. Other key integrated features include the following:
