AD6645 14-Bit, 80 MSPS/105 MSPS A/D Converter

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.

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.

Product Highlights

Applications
  • Multichannel, multimode receivers
  • Base station infrastructure
  • AMPS, IS-136, CDMA, GSM, WCDMA
  • Single channel digital receivers
  • Antenna array processing
  • Communications instrumentation
  • Radar, infrared imaging
  • Instrumentation
Features and Benefits
  • SNR = 75 dB, fIN 15 MHz, up to 105 MSPS
  • SNR = 72 dB, fIN200 MHz, up to 105 MSPS
  • SFDR = 89 dBc, fIN 70 MHz, up to 105 MSPS
  • 100 dBFS multitone SFDR
  • IF sampling to 200 MHz
  • Sampling jitter 0.1 ps
  • 1.5 W power dissipation
  • Differential analog inputs
  • Pin compatible to AD6644
  • Twos complement digital output format
  • 3.3 V CMOS compatible
  • DataReady for output latching
Analog to Digital Converters
AD6645 IBIS Models
Data Sheets
Documentnote
AD6645: 14-Bit, 80 MSPS/105 MSPS A/D Converter Data Sheet (Rev. D)PDF 842 kB
Application Notes
Documentnote
AN-905: Visual Analog Converter Evaluation Tool Version 1.0 User Manual (Rev. 0)PDF 2124 kB
AN-835: Understanding High Speed ADC Testing and Evaluation (Rev. B)PDF 985 kB
AN-501: Aperture Uncertainty and ADC System Performance (Rev. A)PDF 227 kB
AN-282: Fundamentals of Sampled Data SystemsPDF 2131 kB
AN-756: Sampled Systems and the Effects of Clock Phase Noise and Jitter (Rev. 0)PDF 291.7 K
AN-935: Designing an ADC Transformer-Coupled Front End (Rev. 0)PDF 363 kB
AN-345: Grounding for Low-and-High-Frequency CircuitsPDF 455 kB
AN-586: LVDS Outputs for High Speed A/D Converters (Rev. 0)PDF 207 kB
AN-1142: Techniques for High Speed ADC PCB Layout (Rev. 0)PDF 392 kB
AN-737: How ADIsimADC Models an ADC (Rev. B)PDF 373 kB
AN-807: Multicarrier WCDMA Feasibility (Rev. 0)PDF 969 kB
AN-808: Multicarrier CDMA2000 Feasibility (Rev. 0)PDF 1535 kB
AN-715: A First Approach to IBIS Models: What They Are and How They Are Generated (Rev. 0)PDF 370.2 K
AN-741: Little Known Characteristics of Phase Noise (Rev. 0)PDF 1679 kB
Order Information
Part NumberPackagePacking QtyTemp RangePrice 100-499Price 1000+RoHS
AD6645ASVZ-105 Production52 ld TQFP_EP(10x10 w/6.5ep)OTH 160-40 to 85C66.6756.67Y
AD6645ASVZ-80 Production52 ld TQFP_EP(10x10 w/6.5ep)OTH 160-40 to 85C52.0344.22Y
Evaluation Boards
Part NumberDescriptionPriceRoHS
AD6645-105/PCBZEvaluation Board202.4Y
AD6645-80/PCBZEvaluation Board-1Y
Reference Materials
AD6645:14位、80 MSPS/105 MSPS模数转换器 (Rev. D) ad6645
AD6645: 14-Bit, 80 MSPS/105 MSPS A/D Converter Data Sheet (Rev. D) ad6645
AD6645SQ (All Speed Grades) ad6645
AN-808: CDMA2000多载波系统可行性研究 (Rev. 0) adl5330
AN-905: Visual Analog Converter Evaluation Tool Version 1.0 User Manual (Rev. 0) ad9220
AN-835: Understanding High Speed ADC Testing and Evaluation (Rev. B) ad9220
AN-501: Aperture Uncertainty and ADC System Performance (Rev. A) ad9220
AN-282: Fundamentals of Sampled Data Systems ad1674
AN-756: Sampled Systems and the Effects of Clock Phase Noise and Jitter (Rev. 0) ad9220
AN-935: Designing an ADC Transformer-Coupled Front End (Rev. 0) ad9220
AN-345: Grounding for Low-and-High-Frequency Circuits ad9220
AN-586: LVDS Outputs for High Speed A/D Converters (Rev. 0) ad6642
AN-835: 高速ADC测试和评估 (Rev. 0) ad9510
AN-1142: 高速ADC PCB布局布线技巧 (Rev. 0) ad6655
AN-1142: Techniques for High Speed ADC PCB Layout (Rev. 0) ad6655
AN-282: 采样数据系统基本原理[中文版] (Rev. A) ad75019
AN-737: 如何用ADIsimADC完成ADC建模 (Rev. B) ad6642
AN-737: How ADIsimADC Models an ADC (Rev. B) ad9220
AN-807: 多载波WCDMA的可行性 (Rev. 0) adf4106
AN-807: Multicarrier WCDMA Feasibility (Rev. 0) ad6655
AN-808: Multicarrier CDMA2000 Feasibility (Rev. 0) ad9863
AN-905: VisualAnalog™转换器评估工具1.0版用户手册 (Rev. 0) ad6655
AN-935: ADC变压器耦合前端设计[中文版] (Rev. 0) ad6655
AN-586: 高速模数转换器的LVDS数据输出[中文版] (Rev. 0) ad6642
AN-715: 走近IBIS模型：什么是IBIS模型？它们是如何生成的？ (Rev. 0) ad6655
AN-715: A First Approach to IBIS Models: What They Are and How They Are Generated (Rev. 0) ad9220
AN-345: 低频和高频电路接地 ad9540
AN-756: 系统采样以及时钟相位噪声和抖动的影响[中文版] (Rev. 0) ad9540
AN-501: 孔径不确定度与ADC系统性能[中文版] (Rev. A) ad9540
AN-741: Little Known Characteristics of Phase Noise (Rev. 0) ad9221
AN-741: 鲜为人知的相位噪声特性 ad9540
宽带ADC变压器耦合前端设计 ad6645
Military Products by GENERIC Part Number sdc1742
Military Part Cross-Reference Guide sdc1742
Military Products by Function sdc1742
CN-0109: Low Jitter Sampling Clock Generator for High Performance ADCs Using... ad9512
MS-2735: 最大程度地扩大软件定义无线电 的动态范围 ad9864
MS-2210：高速ADC的电源设计 ad9861
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