AD9765AST

更新时间： 2024-11-12 22:50:03

品牌	Logo	应用领域
亚德诺 - ADI		转换器
页数	文件大小	规格书
28页	471K
描述
12-Bit, 125 MSPS Dual TxDAC+ D/A Converter

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数据手册
替代型号

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AD9765AST 数据手册

12-Bit, 125 MSPS

Dual TxDAC+ D/A Converter

AD9765¹

FEATURES

FUNCTIONAL BLOCK DIAGRAM

12-Bit Dual Transmit DAC

125 MSPS Update Rate

DVDD DCOM AVDD ACOM

CLK1

Excellent SFDR to Nyquist @ 5 MHz Output: 75 dBc

Excellent Gain and Offset Matching: 0.1%

Fully Independent or Single Resistor Gain Control

Dual Port or Interleaved Data

On-Chip 1.2 V Reference

Single 5 V or 3 V Supply Operation

Power Dissipation: 380 mW @ 5 V

Power-Down Mode: 50 mW @ 5 V

48-Lead LQFP

OUTA1

“1”

PORT1

LATCH

DAC

OUTB1

REFIO

FSADJ1

FSADJ2

GAINCTRL

REFERENCE

WRT1

WRT2

DIGITAL

AD9765

INTERFACE

BIAS

GENERATOR

SLEEP

OUTA2

“2”

LATCH

“2”

DAC

PORT2

OUTB2

APPLICATIONS

MODE

CLK2

Communications

Base Stations

Digital Synthesis

Quadrature Modulation

and provide a nominal full-scale current of 20 mA. The full-

scale currents between each DAC are matched to within 0.1%.

PRODUCT DESCRIPTION

The AD9765 is a dual port, high speed, two channel, 12-bit

CMOS DAC. It integrates two high quality 12-bit TxDAC+

cores, a voltage reference and digital interface circuitry into a small

48-lead LQFP package. The AD9765 offers exceptional ac and

dc performance while supporting update rates up to 125 MSPS.

The AD9765 is manufactured on an advanced low cost CMOS

process. It operates from a single supply of 3.0 V to 5.0 V and

consumes 380 mW of power.

PRODUCT HIGHLIGHTS

1. The AD9765 is a member of a pin-compatible family of dual

TxDACs providing 8-, 10-, 12-, and 14-bit resolution.

The AD9765 has been optimized for processing I and Q data in

communications applications. The digital interface consists of

two double-buffered latches as well as control logic. Separate

write inputs allow data to be written to the two DAC ports

independent of one another. Separate clocks control the update

rate of the DACs.

2. Dual 12-Bit, 125 MSPS DACs: A pair of high performance

DACs optimized for low distortion performance provide for

flexible transmission of I and Q information.

A mode control pin allows the AD9765 to interface to two separate

data ports, or to a single interleaved high speed data port. In inter-

leaving mode the input data stream is demuxed into its original

I and Q data and then latched. The I and Q data is then con-

verted by the two DACs and updated at half the input data rate.

3. Matching: Gain matching is typically 0.1% of full scale, and

offset error is better than 0.02%.

4. Low Power: Complete CMOS Dual DAC function operates

on 380 mW from a 3.0 V to 5.0 V single supply. The DAC

full-scale current can be reduced for lower power operation,

and a sleep mode is provided for low power idle periods.

The GAINCTRL pin allows two modes for setting the full-scale

current (I_OUTFS) of the two DACs. I_OUTFSfor each DAC can be

set independently using two external resistors, or I_OUTFSfor both

DACs can be set by using a single external resistor.²

5. On-Chip Voltage Reference: The AD9765 includes a 1.20 V

temperature-compensated bandgap voltage reference.

6. Dual 12-Bit Inputs: The AD9765 features a flexible dual-

port interface allowing dual or interleaved input data.

The DACs utilize a segmented current source architecture com-

bined with a proprietary switching technique to reduce glitch

energy and to maximize dynamic accuracy. Each DAC provides

differential current output thus supporting single-ended or dif-

ferential applications. Both DACs can be simultaneously updated

TxDAC+ is a registered trademark of Analog Devices, Inc.

¹Patent pending.

²Please see GAINCTRL Mode section, for important date code information on

this feature.

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

which may result from its use. No license is granted by implication or

otherwise under any patent or patent rights of Analog Devices.

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

Tel: 781/329-4700

Fax: 781/326-8703

World Wide Web Site: http://www.analog.com

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AD9765AST 替代型号

型号	品牌	替代类型	描述	数据表
AD9765ASTZRL	ADI	类似代替	10-/12-/14-Bit, 125 MSPS Dual TxDAC Digital-to-Analog Converters
AD9765ASTZ	ADI	类似代替	10-/12-/14-Bit, 125 MSPS Dual TxDAC Digital-to-Analog Converters
AD9765ASTRL	ADI	类似代替	10-/12-/14-Bit, 125 MSPS Dual TxDAC Digital-to-Analog Converters

与AD9765AST相关器件

型号	品牌	获取价格	描述	数据表
AD9765ASTRL	ADI	获取价格	10-/12-/14-Bit, 125 MSPS Dual TxDAC Digital-to-Analog Converters
AD9765ASTZ	ADI	获取价格	10-/12-/14-Bit, 125 MSPS Dual TxDAC Digital-to-Analog Converters
AD9765ASTZRL	ADI	获取价格	10-/12-/14-Bit, 125 MSPS Dual TxDAC Digital-to-Analog Converters
AD9765-EB	ADI	获取价格	12-Bit, 125 MSPS Dual TxDAC+ D/A Converter
AD9765-EBZ	ADI	获取价格	10-/12-/14-Bit, 125 MSPS Dual TxDAC Digital-to-Analog Converters
AD9767	ADI	获取价格	14-Bit, 125 MSPS Dual TxDAC+ D/A Converter
AD9767AST	ADI	获取价格	14-Bit, 125 MSPS Dual TxDAC+ D/A Converter
AD9767AST	ROCHESTER	获取价格	DUAL, PARALLEL, WORD INPUT LOADING, 0.035 us SETTLING TIME, 14-BIT DAC, PQFP48, MS-026BBC,
AD9767ASTRL	ADI	获取价格	IC DUAL, PARALLEL, WORD INPUT LOADING, 0.035 us SETTLING TIME, 14-BIT DAC, PQFP48, MS-026B
AD9767ASTZ	ADI	获取价格	10-/12-/14-Bit, 125 MSPS Dual TxDAC Digital-to-Analog Converters

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