AD6645ASQ-80 popular integrated circuits Integrated Circuit Chip 14-Bit, 80 MSPS A/D Converter

14-Bit, 80 MSPS A/D Converter AD6645

FEATURES

80 MSPS Guaranteed Sample Rate

SNR = 75 dB, f_IN 15 MHz @ 80 MSPS

SNR = 72 dB, f_IN 200 MHz @ 80 MSPS

SFDR = 89 dBc, f_IN 70 MHz @ 80 MSPS

100 dB Multitone SFDR

IF Sampling to 200 MHz

Sampling Jitter 0.1 ps

1.5 W Power Dissipation

Differential Analog Inputs

Pin-Compatible to AD6644

Two’s Complement Digital Output Format

3.3 V CMOS-Compatible

DataReady for Output Latching

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

PRODUCT DESCRIPTION

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 Device’s 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-tonoise ratio is 74.5 dB through the first Nyquist band.

The AD6645 is built on Analog Devices’ high-speed complementary bipolar process (XFCB) and uses an innovative, multipass circuit architecture. Units are available in a thermally enhanced 52- lead PowerQuad 4® (LQFP_ED) specified from –40℃ to +85℃.

PRODUCT HIGHLIGHTS

1. IF Sampling

The AD6645 maintains outstanding ac performance up to input frequencies of 200 MHz. Suitable for multicarrier 3G wideband cellular IF sampling receivers.

2. Pin Compatibility

The ADC has the same footprint and pin layout as the AD6644, 14-Bit 40 MSPS/65 MSPS ADC.

3. SFDR Performance and Oversampling

Multitone SFDR performance of –100 dBc can reduce the requirements of high-end RF components and allows the use of receive signal processors such as the AD6620 or AD6624/ AD6624A.

ABSOLUTE MAXIMUM RATINGS*

*Absolute maximum ratings are limiting values to be applied individually and beyond which the serviceability of the circuit may be impaired. Functional operability is not necessarily implied. Exposure to absolute maximum rating conditions for an extended period of time may affect device reliability.

FUNCTIONAL BLOCK DIAGRAM

OUTLINE DIMENSIONS

Dimensions shown in millimeters and (inches).

52-Lead PowerQuad 4 (LQFP_ED) (SQ-52)

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