Alternative Parts
Overview
Features and Benefits
- Throughput: 1.25 MSPS
- INL: ±2 LSB typical, ±3 LSB max; ±8 ppm of full scale
- 18-bit resolution with no missing codes
- Dynamic range: 95.5 dB
- SINAD: 93.5 dB typical @ 20 kHz (VREF = 2.5 V)
- THD: −112 dB typical @ 20 kHz (VREF = 2.5 V)
- No pipeline delay (SAR architecture)
- Pb-free, 48-lead LQFP and 48-lead LFCSP
- Pin compatible with the AD7641 and other PulSAR ADC’s
- 2.048 V internal reference: typical drift 10 ppm/°C; TEMP output
- Differential input range: ±VREF
(VREF up to 2.5 V) - Parallel (18-, 16-, or 8-bit bus) and serial 5 V/3.3 V/2.5 V interface
- SPI®/QSPI™/MICROWIRE™/DSP compatible
- Single 2.5 V supply operation
- Power dissipation
- 65 mW typical @ 1.25 MSPS with internal REF
- 2 μW in power-down mode
Product Details
The AD7643 is an 18-bit, 1.25 MSPS, charge redistribution SAR, fully differential, analog-to-digital converter (ADC) that operates from a single 2.5 V power supply. The part contains a high speed, 18-bit sampling ADC, an internal conversion clock, an internal reference (and buffer), error correction circuits, and both serial and parallel system interface ports. The part has no latency and can be used in asynchronous rate applications. The AD7643 is hardware factory calibrated and tested to ensure ac parameters, such as signal-to-noise ratio (SNR), in addition to the more traditional dc parameters of gain, offset, and linearity. The AD7643 is available in Pb-free only packages with operation specified from −40°C to +85°C.
PRODUCT HIGHLIGHTS
- Fast Throughput. The AD7643 is a 1.25MSPS, charge redistribution, 18-bit SAR ADC.
- Superior Linearity. The AD7643 has no missing 18-bit code.
- Internal Reference. The AD7643 has a 2.048 V internal reference with a typical drift of ±10 ppm/°C and an on-chip TEMP sensor.
- Single-Supply Operation. The AD7643 operates from a 2.5 V single supply.
- Serial or Parallel Interface. Versatile parallel (18-, 16-, or 8-bit bus) or 2-wire serial interface arrangement compatible with 2.5 V, 3.3 V, or 5 V logic.
APPLICATIONS
- Medical instruments
- High speed data acquisition/high dynamic data acquisition
- Digital signal processing
- Spectrum analysis
- Instrumentation
- Communications
- ATE
Product Categories
Markets and Technologies
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
Documentation & Resources
-
Understanding PulSAR ADC Support Circuitry7/30/2020
-
AN-932: Power Supply Sequencing2/1/2008
Product Recommendations
AD7643 Companion Parts
Recommended Driver Amplifiers
- For low noise, high gain bandwidth: AD8021, ADA4899-1, AD8022.
- For low noise, low distortion, low power: ADA4841-1.
- For a fully differential attenuating precision amplifier: AD8475.
- For single-ended to differential driver applications: AD8139, ADA4930-1.
Recommended External Voltage References
Design Resources
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.
| Part Number | Material Declaration | Reliability Data | Pin/Package Drawing | CAD Symbols, Footprints & 3D Models |
|---|---|---|---|---|
| AD7643BCPZ | Material Declaration | Reliability Data | 48-Lead LFCSP (7mm x 7mm x 0.85mm w/ EP) | |
| AD7643BCPZRL | Material Declaration | Reliability Data | 48-Lead LFCSP (7mm x 7mm x 0.85mm w/ EP) | |
| AD7643BSTZ | Material Declaration | Reliability Data | 48-Lead LQFP (7mm x 7mm) | |
| AD7643BSTZRL | Material Declaration | Reliability Data | 48-Lead LQFP (7mm x 7mm) | |
| Wafer Fabrication Data |
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Sample & Buy
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.