AD6645ASVZ105 Analog Devices, AD6645ASVZ105 Datasheet

AD6645ASVZ105

Manufacturer Part Number

AD6645ASVZ105

Description

QFP52

Manufacturer

Analog Devices

Datasheet

1.AD6645ASVZ105.pdf (24 pages)

Specifications of AD6645ASVZ105

Date_code

09+

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FEATURES

SNR = 75 dB, f

SNR = 72 dB, f

SFDR = 89 dBc, f

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

Data-ready for output latching

APPLICATIONS

Multichannel, multimode receivers

Base station infrastructures

AMPS, IS-136, CDMA, GSM, W-CDMA

Single channel digital receivers

Antenna array processing

Communications instrumentation

Radars, infrared imaging

Instrumentation

GENERAL DESCRIPTION

The AD6645 is a high speed, high performance, monolithic 14-bit

analog-to-digital converter (ADC). 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

Rev. D

Information furnished by Analog Devices is believed to be accurate and reliable. However, no

responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other

rights of third parties that may result from its use. Specifications subject to change without notice. No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarks and registered trademarks are the property of their respective owners.

ENCODE

VREF

AIN

15 MHz, up to 105 MSPS

200 MHz, up to 105 MSPS

2.4V

INTERNAL

70 MHz, up to 105 MSPS

TIMING

GND

TH1

DMID

ADC1

OVR

TH2

DRY

DAC1

MSB

FUNCTIONAL BLOCK DIAGRAM

D13

D12

D11

DIGITAL ERROR CORRECTION LOGIC

Figure 1.

D10

AD6645

TH3

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

Fax: 781.461.3113

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 the 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

(SNR) is 74.5 dB through the first Nyquist band.

The AD6645 is built on the Analog Devices extra fast

complementary bipolar (XFCB) process and uses an innovative,

multipass circuit architecture. Units are available in thermally

enhanced 52-lead PowerQuad 4 (LQFP_PQ4) and 52-lead

exposed pad (TQFP_EP) packages specified from −40°C to

+85°C at 80 MSPS and −10°C to +85°C at 105 MSPS.

PRODUCT HIGHLIGHTS

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.

ADC2

TH4

14-Bit, 80 MSPS/105 MSPS

DAC2

TH5

A/D Converter

ADC3

AD6645

www.analog.com

LSB

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