ADCads481资源-CSDN文库

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### ADC ADS5481 知识点解析 #### 一、概述 ADS5481 是一款由德州仪器（Texas Instruments）生产的高性能模数转换器（Analog-to-Digital Converter, ADC）。这款器件能够提供高达135MSPS（每秒百万样本）的采样速率，并具备16位的分辨率，适用于多种应用场合。 #### 二、主要特点 1. **高采样率**：支持三种不同的采样速率——80MSPS、105MSPS 和 135MSPS。 2. **高分辨率**：16位分辨率确保了较高的精度。 3. **出色的动态范围**：在135MSPS 的采样率下，信号无杂散动态范围 (SFDR) 可达 95 dBc，信噪比 (SNR) 可达 78.6 dBFS。 4. **高效的DDRLVDS兼容输出**：使用低电压差分信号 (LVDS) 格式输出数据，提高了数据传输速度和效率。 5. **内置抖动功能**：通过内部抖动提高信号质量。 6. **低功耗设计**：总功率消耗仅为 2.2W，在功率下降模式下可降至 70mW。 7. **集成缓冲器与参考源**：集成的高阻抗模拟输入缓冲器隔离了内部开关动作对信号源的干扰；同时集成了参考源，简化系统设计。 8. **广泛的温度范围**：工作温度范围为 -40°C 至 +85°C。 9. **紧凑型封装**：采用 QFN-64 PowerPAD 封装，尺寸为 9mm x 9mm。 #### 三、应用场景 1. **无线基础设施**：包括多载波 GSM、WCDMA 和 LTE 等标准。 2. **测试与测量仪器**：用于各种精密测量设备中。 3. **软件定义无线电 (SDR)**：在 SDR 应用中实现灵活的信号处理。 4. **数据采集系统**：适用于高速数据采集任务。 5. **功率放大器线性化**：提高功率放大器的工作效率和性能。 6. **雷达系统**：用于雷达信号处理，提升探测能力。 7. **医疗成像**：在医疗成像技术中的应用。 8. **工业自动化与控制**：适用于各种工业环境下的信号处理需求。 #### 四、性能指标 - **SFDR（信号无杂散动态范围）**：随着输入频率的变化而变化，如图表所示，当输入频率为 100MHz 时，SFDR 约为 120dBc。 - **SNR（信噪比）**：同样随输入频率变化，如图表所示，当输入频率为 80MHz 时，SNR 大约为 140dBFS。 #### 五、技术细节 - **电源电压**：支持 5V 和 3.3V 两种供电方式。 - **数字输出接口**：采用 LVDS 标准，确保高速且稳定的数字信号传输。 - **内部结构**：基于德州仪器的互补双极工艺 (BiCom3)，保证了器件的高性能和稳定性。 #### 六、封装与制造 - **封装形式**：采用 QFN-64 PowerPAD 封装，具有良好的热性能。 - **制造工艺**：采用德州仪器的 BiCom3 工艺制造。 ADS5481 作为一款高性能的模数转换器，凭借其高采样率、高分辨率以及优异的动态范围等特性，在无线通信、测试测量、软件定义无线电等领域具有广泛的应用前景。此外，其紧凑的封装形式和低功耗设计也为实际应用提供了极大的便利。

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FEATURES APPLICATIONS

DESCRIPTION

− Input Frequency − MHz

100

0 20 40 60 80 100 120 140

SFDR − dBc

G068

ADS5482

ADS5483

ADS5481

− Input Frequency − MHz

0 20 40 60 80 100 120 140

SNR − dBFS

G069

ADS5483

ADS5481

ADS5482

ADS5481

ADS5482, ADS5483

www.ti.com

...................................................................................................................................................................................................... SLAS565 – JUNE 2008

16-Bit, 80/105/135-MSPS Analog-to-Digital Converters

• Wireless Infrastructure (Multi-Carrier GSM,

• 80/105/135-MSPS Sample Rates

WCDMA, LTE)

• 16-Bit Resolution

• Test and Measurement Instrumentation

• SFDR = 95 dBc at 70 MHz and 135 MSPS

• Software-Defined Radio

• SNR = 78.6 dBFS at 70 MHz and 135 MSPS

• Data Acquisition

• Efficient DDR LVDS-Compatible Outputs

• Power Amplifier Linearization

• Internal Dither Available

• Communication Instrumentation

• Total Power Dissipation: 2.2 W

• Radar

• Powerdown Mode: 70 mW

• Medical Imaging

• On-Chip High Impedance Analog Buffer

• QFN-64 PowerPAD™ Package

(9 mm × 9 mm footprint)

• Industrial Temperature Range:

– 40 ° C to +85 ° C

The ADS5481/ADS5482/ADS5483 (ADS548x) is a 16-bit family of analog-to-digital converters (ADCs) that

operate from both a 5-V supply and 3.3-V supply while providing LVDS-compatible digital outputs. The ADS548x

integrated analog input buffer isolates the internal switching of the onboard track and hold (T & H) from disturbing

the signal source while providing a high-impedance input. An internal reference generator is also provided to

simplify the system design.

Designed for highest total ENOB, the ADS548x family has outstanding low noise performance and spurious-free

dynamic range.

The ADS548x is available in an QFN-64 PowerPAD package. The device is built on Texas Instruments

complementary bipolar process (BiCom3) and is specified over the full industrial temperature range ( – 40 ° C to

+85 ° C).

SFDR SNR

vs vs

INPUT FREQUENCY INPUT FREQUENCY

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2 PowerPAD is a trademark of Texas Instruments.

3 All other trademarks are the property of their respective owners.

UNLESS OTHERWISE NOTED this document contains

PRODUCTION DATA information current as of publication date.

Products conform to specifications per the terms of Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

ABSOLUTE MAXIMUM RATINGS

(1)

THERMAL CHARACTERISTICS

(1)

ADS5481

ADS5482, ADS5483

www.ti.com

Over operating free-air temperature range, unless otherwise noted.

ADS5481, ADS5482, ADS5483 UNIT

AVDD5 to GND 6 V

Supply voltage AVDD3 to GND 5 V

DVDD3 to GND 5 V

Analog input to Valid when AVDD5 is within normal operating range. When AVDD5 is – 0.3 to (AVDD5 + 0.3) V

GND off, analog inputs should be < 0.5V. If not, the protection diode between

the inputs and AVDD5 will become forward-biased and could be

damaged or shorten device lifetime (see Figure 32 ). Short transient

conditions during power on/off are not a concern.

Clock input to GND Valid when AVDD3 is within normal operating range. When AVDD3 is – 0.3 to (AVDD3 + 0.3) V

off, clock inputs should be < 0.5V. If not, the protection diode between the

inputs and AVDD3 will become forward-biased and could be damaged or

shorten device lifetime (see Figure 39 ). Short transient conditions during

power on/off are not a concern.

CLKP to CLKM ± 2.5 V

Digital data output to GND – 0.3 to (DVDD3 + 0.3) V

Digital data output Plus-to-Minus ± 1 V

Operating temperature range – 40 to +85 ° C

Maximum junction temperature +150 ° C

Storage temperature range – 65 to +150 ° C

ESD, human-body model (HBM) 2 kV

(1) Stresses above these ratings may cause permanent damage. Exposure to absolute maximum conditions for extended periods may

degrade device reliability. These are stress ratings only, and functional operation of the device at these or any other conditions beyond

those specified is not implied. Kirkendall voidings and current density information for calculation of expected lifetime are available upon

request.

PARAMETER TEST CONDITIONS TYP UNIT

Soldered thermal pad, no airflow 20

θ JA

Soldered thermal pad, 150-LFM airflow 16

° C/W

θ JC

thermal resistance from the junction to the package case (top) 7

θ JP

thermal resistance from the junction to the thermal pad (bottom) 0.2

(1) Using 49 thermal vias ( 7 × 7 array). See PowerPAD Package in the Application Information section.

Product Folder Link(s): ADS5481 ADS5482, ADS5483

RECOMMENDED OPERATING CONDITIONS

ELECTRICAL CHARACTERISTICS (ADS5481, ADS5482, ADS5483)

ADS5481

ADS5482, ADS5483

SLAS565 – JUNE 2008 ......................................................................................................................................................................................................

www.ti.com

ADS5481, ADS5482,

ADS5483

UNIT

MIN TYP MAX

SUPPLIES

AVDD5 Analog supply voltage 4.75 5 5.25 V

AVDD3 Analog supply voltage 3.1 3.3 3.6 V

DVDD3 Output driver supply voltage 3 3.3 3.6 V

ANALOG INPUT

Differential input range 3 V

VCM Input common mode 3.1 V

DIGITAL OUTPUT (DRY, DATA)

Maximum differential output load (parasitic or intentional) 5 pF

Differential Output Resistance 100 Ω

CLOCK INPUT (CLK)

CLK input sample rate (sine wave) 10 Max MSPS

Rated

Clock

Clock amplitude, differential sine wave (see Figure 41 ) 1.5 5 V

Clock duty cycle (see Figure 46 ) 45 50 55 %

Operating free-air temperature – 40 +85 ° C

Typical values at T

= +25 ° C: minimum and maximum values over full temperature range T

MIN

= – 40 ° C to T

MAX

= +85 ° C,

sampling rate = Max Rated, 50% clock duty cycle, AVDD5 = 5 V, AVDD3 = 3.3 V, DVDD3 = 3.3 V, – 1 dBFS differential input,

and 3-V

differential clock, unless otherwise noted.

ADS5481 ADS5482 ADS5483

PARAMETER TEST CONDITIONS UNIT

MIN TYP MAX MIN TYP MAX MIN TYP MAX

Clock Rate 80 105 135 MSPS

Resolution 16 16 16 Bits

ANALOG INPUTS

Differential input range 3 3 3 V

Analog input common-mode Self-biased; see VCM 3.1 3.1 3.1

voltage specification below

Input resistance (dc) Each input to VCM 1000 1000 1000 Ω

Input capacitance Each input to GND 3.5 3.5 3.5 pF

(including package)

Analog input bandwidth

125 125 485 MHz

( – 3dB)

Common-mode signal

CMRR Common-mode rejection ratio 65 65 65 dB

70 MHz (see Figure 28 )

INTERNAL REFERENCE VOLTAGE

VREF Reference voltage 1.2 1.2 1.2 V

Analog input common-mode With internal voltage

VCM 3 3.15 3.35 3 3.15 3.35 3 3.15 3.35 V

voltage reference output reference

VCM temperature coefficient -1 -1 -1 mV/ ° C

Product Folder Link(s): ADS5481 ADS5482, ADS5483

ADS5481

ADS5482, ADS5483

www.ti.com

ELECTRICAL CHARACTERISTICS (ADS5481, ADS5482, ADS5483) (continued)

Typical values at T

= +25 ° C: minimum and maximum values over full temperature range T

MIN

= – 40 ° C to T

MAX

= +85 ° C,

sampling rate = Max Rated, 50% clock duty cycle, AVDD5 = 5 V, AVDD3 = 3.3 V, DVDD3 = 3.3 V, – 1 dBFS differential input,

and 3-V

differential clock, unless otherwise noted.

ADS5481 ADS5482 ADS5483

PARAMETER TEST CONDITIONS UNIT

MIN TYP MAX MIN TYP MAX MIN TYP MAX

DYNAMIC ACCURACY

No Missing Codes,

DNL Differential linearity error -0.99 ± 0.5 1.0 -0.99 ± 0.5 1.0 -0.99 ± 0.5 1.0 LSB

= 30 MHz

INL Integral linearity error f

= 30 MHz -10 ± 3 +10 -10 ± 3 +10 -10 ± 3 +10 LSB

Offset error -15 15 -15 15 -15 15 mV

Offset temperature coefficient -0.02 -0.02 -0.02 mV/ ° C

Gain error -6 ± 2 6 -6 ± 2 6 -6 ± 2 6 %FS

Gain temperature coefficient -0.01 -0.01 -0.01 mV/ ° C

POWER SUPPLY

AVDD5

5-V analog 316 TBD 316 TBD 317 330 mA

= full-scale, f

= 30

AVDD3

3.3-V analog 131 TBD 131 TBD 133 150 mA

MHz,

= Max Rated, Normal

DVDD3

3.3-V digital/LVDS 60 TBD 60 TBD 60 65 mA

Operation

Total power dissipation 2.2 TBD 2.2 TBD 2.2 2.35 W

AVDD5

5-V analog 98 98 98 mA

AVDD3

3.3-V analog 35 35 35 mA

Light Sleep Mode

(PDWNF=H, PDWNS=L)

DVDD3

3.3-V digital/LVDS 0.07 0.07 0.07 mA

Total power dissipation 605 TBD 605 TBD 605 680 mW

AVDD5

5-V analog 13 13 13 mA

AVDD3

3.3-V analog 2 2 2 mA

Deep Sleep Mode

(PDWNF=L, PDWNS=H)

DVDD3

3.3-V digital/LVDS 0.07 0.07 0.07 mA

Total power dissipation 70 TBD 70 TBD 70 100 mW

Fast Wakeup Time (Light From PDWNF disabled

600 600 600 µ S

Sleep)

Slow Wakeup Time (Deep From PDWNS disabled

6 6 6 mS

Sleep)

AVDD5 supply Power-supply rejection ratio, 60 60 60 dB

Without 0.1- µ F board supply

AVDD3 supply 80 80 80 dB

PSRR capacitors, with 1-MHz

supply noise (see

95 95 95

DVDD3 supply dB

Figure 48 )

DYNAMIC AC CHARACTERISTICS

= 10 MHz TBD 81 TBD 80.5 77 79

= 30 MHz TBD 80.6 TBD 80.5 77 79

SNR Signal-to-noise ratio f

= 70 MHz 80.1 79.8 78.6 dBFS

= 100 MHz 79.6 79.1 78.2

= 130 MHz 77.8

= 10 MHz TBD 98 TBD 98 87 97

= 30 MHz TBD 97 TBD 97 87 97

SFDR Spurious-free dynamic range f

= 70 MHz 94 93 95 dBc

= 100 MHz 92 93 88

= 130 MHz 85

= 10 MHz TBD 108 TBD 107 87 102

= 30 MHz TBD 101 TBD 105 87 99

HD2 Second-harmonic f

= 70 MHz 100 101 95 dBc

= 100 MHz 99 100 92

= 130 MHz 85

Product Folder Link(s): ADS5481 ADS5482, ADS5483

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