14-Bit, 80 MSPS/105 MSPS A/D Converter
The AD6645 is a high speed, high performance, monolithic 14-bit analog-to-digital converter. All necessary functions, including track-and-hold (T/H) and reference, are included on the chip to provide a complete conversion solution. The AD6645 provides CMOS-compatible digital outputs. It is the fourth generation in a wideband ADC family, preceded by the AD9042 (12-bit, 41 MSPS), the AD6640 (12-bit, 65 MSPS, IF sampling), and the AD6644 (14-bit, 40 MSPS/65 MSPS).
Designed for multichannel, multimode receivers, the AD6645 is part of Analog Devices, Inc. SoftCell® transceiver chipset. The AD6645 maintains 100 dB multitone, spurious-free dynamic range (SFDR) through the second Nyquist band. This breakthrough performance eases the burden placed on multimode digital receivers (software radios) that are typically limited by the ADC. Noise performance is exceptional; typical signal-to-noise ratio is 74.5 dB through the first Nyquist band.
The AD6645 is built on Analog Devices' extra fast complementary bipolar (XFCB) process and uses an innovative, multipass circuit architecture. Units are available in a thermally enhanced 52-lead PowerQuad 4 (LQFP_PQ4) package specified from −40°C to +85°C at 80 MSPS and −10°C to +85°C at 105 MSPS.
- IF Sampling. The AD6645 maintains outstanding ac performance up to input frequencies of 200 MHz, suitable for multicarrier 3G wideband cellular IF sampling receivers.
- Pin Compatibility. The ADC has the same footprint and pin layout as the AD6644 14-bit, 40 MSPS/65 MSPS ADC.
- SFDR Performance and Oversampling. Multitone SFDR performance of 100 dBFS can reduce the requirements of high end RF components and allows the use of receive signal processors such as the AD6620, AD6624/AD6624A, or AD6636.
- Multichannel, multimode receivers
- Base station infrastructure
- AMPS, IS-136, CDMA, GSM, WCDMA
- Single channel digital receivers
- Antenna array processing
- Communications instrumentation
- Radar, infrared imaging
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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.
Customer Case Studies
Ball Aerospace Case Study
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Analog-to-Digital Converter Clock Optimization: A Test Engineering Perspective
(Analog Dialogue, Vol. 42, February 2008)
Transformer-Coupled Front-End for Wideband A/D Converters
by Rob Reeder, Analog Devices, Inc. (Analog Dialogue, Vol 39, April 2005)
Ultrasound Analog Electronics Primer
(Analog Dialogue, Vol. 33, No. 5, May, 1999)
Pushing the State of the Art with Multichannel A/D Converters
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(Analog Dialogue, Vol. 31, No. 2, 1997)
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