Datasheet > LTC1748

LTC1748

更新时间： 2023-12-20 18:44:16

品牌	Logo	应用领域
亚德诺 - ADI		/
页数	文件大小	规格书
20页	528K
描述
14 位、80Msps 低噪声 ADC

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LTC1748 数据手册

LTC1748

14-Bit, 80Msps Low Noise ADC

FEATURES

DESCRIPTIO

The LTC^®1748 is an 80Msps, sampling 14-bit A/D con-

verter designed for digitizing high frequency, wide dy-

namic range signals. Pin selectable input ranges of ±1V

and ±1.6V along with a resistor programmable mode

allowtheLTC1748’sinputrangetobeoptimizedforawide

variety of applications.

■

Sample Rate: 80Msps

■

76.3dB SNR and 90dB SFDR (3.2V Range)

■

72.6dB SNR and 90dB SFDR (2V Range)

■

No Missing Codes

Single 5V Supply

Power Dissipation: 1.4W

■

Selectable Input Ranges: ±1V or ±1.6V

The LTC1748 is perfect for demanding communications

applications with AC performance that includes 76.3dB

SNRand90dBspuriousfreedynamicrange.Ultralowjitter

of0.15ps_RMSallowsundersamplingofIFfrequencieswith

excellentnoiseperformance.DCspecsinclude±3LSBINL

and no missing codes.

■

240MHz Full Power Bandwidth S/H

■

Pin Compatible Family

25Msps: LTC1746 (14-Bit), LTC1745 (12-Bit)

50Msps: LTC1744 (14-Bit), LTC1743 (12-Bit)

65Msps: LTC1742 (14-Bit), LTC1741 (12-Bit)

80Msps: LTC1748 (14-Bit), LTC1747 (12-Bit)

The digital interface is compatible with 5V, 3V, 2V and

LVDS logic systems. The ENC and ENC inputs may be

driven differentially from PECL, GTL and other low swing

logic families or from single-ended TTL or CMOS. The low

noise, high gain ENC and ENC inputs may also be driven

by a sinusoidal signal without degrading performance. A

separate output power supply can be operated from 0.5V

to 5V, making it easy to connect directly to any low voltage

DSPs or FIFOs.

■

48-Pin TSSOP Package

APPLICATIO S

■

Telecommunications

■

Receivers

■

Cellular Base Stations

Spectrum Analysis

Imaging Systems

■

The TSSOP package with a flow-through pinout simplifies

the board layout.

, LTC and LT are registered trademarks of Linear Technology Corporation.

BLOCK DIAGRA

80Msps, 14-Bit ADC with a 2V Differential Input Range

0.5V

TO 5V

0.1µF

D13

CORRECTION

LOGIC AND

SHIFT

±1V

DIFFERENTIAL

ANALOG INPUT

S/H

AMP

14-BIT

PIPELINED ADC

OUTPUT

LATCHES

•

–

CLKOUT

OGND

SENSE

BUFFER

1µF

RANGE

SELECT

DIFF AMP

1µF

GND

2.35V

REF

CONTROL LOGIC

4.7µF

1748 BD

REFLB REFHA

4.7µF

REFLA REFHB ENC ENC MSBINV

0.1µF

DIFFERENTIAL

ENCODE INPUT

1µF

1748fa

12 3 4 5 6 7...20

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