Datasheet > LTC1746

LTC1746

更新时间： 2023-12-20 18:46:16

品牌	Logo	应用领域
亚德诺 - ADI		/
页数	文件大小	规格书
20页	211K
描述
低功率、14 位、25Msps ADC

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LTC1746 数据手册

LTC1746

Low Power,14-Bit, 25Msps ADC

DESCRIPTIO

FEATURES

The LTC^®1746 is a 25Msps, 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

allowtheLTC1746’sinputrangetobeoptimizedforawide

variety of applications.

■

Sample Rate: 25Msps

■

77.5dB SNR and 91dB SFDR (3.2V Range)

■

74dB SNR and 96dB SFDR (2V Range)

■

No Missing Codes

Single 5V Supply

Low Power Dissipation: 390mW

■

Selectable Input Ranges: ±1V or ±1.6V

The LTC1746 is perfect for demanding communications

applications with AC performance that includes 77.5dB

SNRand91dBspuriousfreedynamicrange.Ultralowjitter

of 0.3ps_RMSallows undersampling with excellent noise

performance. DC specs include ±3LSB INL maximum and

no missing codes over temperature.

■

240MHz Full Power Bandwidth S/H

■

Pin Compatible Family

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

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

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

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

Thedigitalinterfaceiscompatiblewith5V, 3Vand2Vlogic

systems. The ENC and ENC inputs may be driven differen-

tiallyfromPECL, GTLandotherlowswinglogicfamiliesor

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 digital

output power supply can be operated from 0.5V to 5V,

making it easy to connect directly to low voltage DSPs

or FIFOs.

APPLICATIO S

■

Telecommunications

Medical Imaging

■

Receivers

Base Stations

■

Spectrum Analysis

Imaging Systems

■

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

The TSSOP package with a flow-through pinout simplifies

the board layout.

BLOCK DIAGRA

25Msps, 14-Bit ADC with a ±1V Differential Input Range

0.5V TO 5V

0.1µF

D13

±1V

DIFFERENTIAL

ANALOG INPUT

S/H

AMP

14-BIT

PIPELINED ADC

OUTPUT

LATCHES

•

–

CLKOUT

SENSE

OGND

BUFFER

1µF

RANGE

SELECT

1µF

DIFF AMP

GND

2.35V

REF

CONTROL LOGIC

4.7µF

1746 BD

REFLB REFHA

4.7µF

REFLA REFHB

ENC ENC MSBINV

0.1µF

DIFFERENTIAL

ENCODE INPUT

1µF

1746f

12 3 4 5 6 7...20

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