AD9708：高性能8位TxDAC数模转换器

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"AD9708是一款高性能、低功耗的8位CMOS数模转换器(DAC)，属于Analog Devices公司的TxDAC™系列。这个系列包括8、10、12、14位不同分辨率的引脚兼容DAC，专为通信系统的发射信号路径设计。AD9708具有125 MSPS的高速更新速率，提供卓越的交流和直流性能，适用于需要高精度和快速响应的应用。该器件内置1.2 V的片内基准电压源和基准电压控制放大器，通过单个外部电阻即可设定满量程输出电流，范围在2mA到20mA之间，而不会影响其动态性能。这使得AD9708能在低功耗模式下工作，或者通过调整电流以适应20dB的增益范围变化。其采用28引脚SOIC封装，适用于工业温度范围。 AD9708的功能框图显示了其内部结构，包括+1.20V参考电压、参考输入输出（REFLO, REFIO）、全尺度调整（FSADJ）、电流源阵列、分段开关、锁存器、数字数据输入（DB7-DB0）、电源电压（AVDD, DVDD）、比较器（COMP1, COMP2）以及差分电流输出（IOUTA, IOUTB）等关键组件。此外，器件还包括时钟、睡眠模式和DCOM端口，以实现灵活的系统控制。器件的主要特点包括：作为TxDAC产品家族的一员，具有引脚兼容性；125 MSPS的更新速率，8位分辨率；极低的非线性误差（1/4 LSB DNL和1/4 LSB INL）；在5MHz输出时的信噪比(SINAD)达到50dB；在5V供电下功率消耗仅为175mW，而在3V供电下可降至45mW；低功耗待机模式下功率为20mW（5V供电）；以及集成的1.20V参考电压，支持单+5V电源操作。此器件适用于需要高速、高精度、低功耗数模转换的场合，如无线通信、测试与测量设备、射频信号发生器和数字化仪等应用。用户手册（REV.B）提供了详细的技术规格、应用电路示例、接口操作指南以及电气特性表，以帮助设计人员充分利用AD9708的性能。"

AD9708

–4–

REV. B

ABSOLUTE MAXIMUM RATINGS*

With

Parameter Respect to Min Max Units

AVDD ACOM –0.3 +6.5 V

DVDD DCOM –0.3 +6.5 V

ACOM DCOM –0.3 +0.3 V

AVDD DVDD –6.5 +6.5 V

CLOCK, SLEEP DCOM –0.3 DVDD + 0.3 V

Digital Inputs DCOM –0.3 DVDD + 0.3 V

IOUTA, IOUTB ACOM –1.0 AVDD + 0.3 V

COMP1, COMP2 ACOM –0.3 AVDD + 0.3 V

REFIO, FSADJ ACOM –0.3 AVDD + 0.3 V

REFLO ACOM –0.3 +0.3 V

Junction Temperature +150 °C

Storage Temperature –65 +150 °C

Lead Temperature

(10 sec) +300 °C

*Stresses above those listed under Absolute Maximum Ratings may cause perma-

nent damage to the device. This is a stress rating only; functional operation of the

device at these or any other conditions above those indicated in the operational

sections of this specification is not implied. Exposure to absolute maximum

ratings for extended periods may effect device reliability.

THERMAL CHARACTERISTICS

Thermal Resistance

28-Lead 300 mil SOIC

= 71.4°C/W

= 23°C/W

28-Lead TSSOP

= 97.9°C/W

= 14.0°C/W

PIN CONFIGURATION

TOP VIEW

(Not to Scale)

AD9708

NC = NO CONNECT

(MSB) DB7

DB6

DB5

DB4

DB3

DB2

DB1

DB0

CLOCK

DVDD

DCOM

AVDD

COMP2

IOUTA

IOUTB

ACOM

COMP1

FS ADJ

REFIO

REFLO

SLEEP

CAUTION

ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily

accumulate on the human body and test equipment and can discharge without detection.

Although the AD9708 features proprietary ESD protection circuitry, permanent damage may

occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD

precautions are recommended to avoid performance degradation or loss of functionality.

PIN FUNCTION DESCRIPTIONS

Pin No. Name Description

1 DB7 Most Significant Data Bit (MSB).

2–7 DB6–DB1 Data Bits 1–6.

8 DB0 Least Significant Data Bit (LSB).

9–14, 25 NC No Internal Connection.

15 SLEEP Power-Down Control Input. Active

High. Contains active pull-down circuit,

thus may be left unterminated if not

used.

16 REFLO Reference Ground when Internal 1.2 V

Reference Used. Connect to AVDD to

disable internal reference.

17 REFIO Reference Input/Output. Serves as

reference input when internal reference

disabled (i.e., Tie REFLO to AVDD).

Serves as 1.2 V reference output when

internal reference activated (i.e., Tie

REFLO to ACOM). Requires 0.1 µF

capacitor to ACOM when internal

reference activated.

18 FS ADJ Full-Scale Current Output Adjust.

19 COMP1 Bandwidth/Noise Reduction Node.

Add 0.1 µF to AVDD for optimum

performance.

20 ACOM Analog Common.

21 IOUTB Complementary DAC Current Output.

Full-scale current when all data bits

are 0s.

22 IOUTA DAC Current Output. Full-scale

current when all data bits are 1s.

23 COMP2 Internal Bias Node for Switch Driver

Circuitry. Decouple to ACOM with

0.1 µF capacitor.

24 AVDD Analog Supply Voltage (+2.7 V to

+5.5 V).

26 DCOM Digital Common.

27 DVDD Digital Supply Voltage (+2.7 V to

+5.5 V).

28 CLOCK Clock Input. Data latched on positive

edge of clock.

ORDERING GUIDE

Temperature Package Package

Model Range Descriptions Options*

AD9708AR –40°C to +85°C 28-Lead 300 Mil SOIC R-28

AD9708ARU –40°C to +85°C 28-Lead TSSOP RU-28

AD9708-EB Evaluation Board

*R = Small Outline IC; RU = Thin Small Outline IC.

WARNING!

ESD SENSITIVE DEVICE

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