AD6645ASQ105 Analog Devices, AD6645ASQ105 Datasheet

AD6645ASQ105

Manufacturer Part Number

AD6645ASQ105

Description

QFP52

Manufacturer

Analog Devices

Datasheet

1.AD6645ASQZ80.pdf (20 pages)

Specifications of AD6645ASQ105

Date_code

04+

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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),

REV. B

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. 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 companies.

FEATURES

SNR = 75 dB, f

SNR = 72 dB, f

SFDR = 89 dBc, f

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

Twos 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

ENCODE

VREF

AIN

2.4V

INTERNAL

TIMING

GND

15 MHz up to 105 MSPS

200 MHz up to 105 MSPS

70 MHz up to 105 MSPS

TH1

DMID

ADC1

OVR

TH2

DRY

DAC1

FUNCTIONAL BLOCK DIAGRAM

MSB

D13

D12

D11

DIGITAL ERROR CORRECTION LOGIC

D10

AD6645

TH3

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’ SoftCell

AD6645 maintains 100 dB multitone, spurious-free dynamic

range (SFDR) through the second Nyquist band. This break-

through 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’ high speed complemen-

tary bipolar process (XFCB) and uses an innovative, multipass

circuit architecture. Units are available in a thermally enhanced

52-lead PowerQuad 4

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

PRODUCT HIGHLIGHTS

1. IF Sampling

2. Pin Compatibility

3. SFDR Performance and Oversampling

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

Tel: 781/329-4700

Fax: 781/326-8703

The AD6645 maintains outstanding ac performance up to

input frequencies of 200 MHz, suitable for multicarrier 3G

wideband cellular IF sampling receivers.

The ADC has the same footprint and pin layout as the

AD6644, 14-Bit 40 MSPS/65 MSPS ADC.

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.

ADC2

TH4

DAC2

14-Bit, 80/105 MSPS

(LQFP_PQ4) specified from –40°C to

TH5

A/D Converter

transceiver chipset. The

AD6645

ADC3

www.analog.com

LSB

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