AD芯片参数手册资源-CSDN文库

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### AD芯片参数手册：LTC1420AD高精度AD概述 #### 一、引言在现代电子系统设计中，模数转换器（Analog-to-Digital Converter, ADC）是连接模拟世界与数字世界的桥梁，对于信号处理、通信系统、测量仪器等领域至关重要。LTC1420是一款由Linear Technology Corporation生产的高性能模数转换器，以其高速度、高精度等特点著称，在电信、数字信号处理、高速数据采集等多个领域有着广泛的应用前景。 #### 二、产品特性 LTC1420的主要技术规格包括但不限于以下几点： 1. **采样速率**：最高可达10M samples per second (Msps)，满足了高速数据采集的需求。 2. **分辨率**：提供12位分辨率，确保了良好的动态范围和信噪比。 3. **供电方式**：支持单电源5V或双电源±5V供电，适用于不同的应用场景。 4. **功耗**：在典型工作条件下，总功耗仅为250mW，有助于降低整体系统的能量消耗。 5. **非线性误差**：最大直流规格下积分非线性误差小于0.35LSB，差分非线性误差小于0.25LSB，确保了转换结果的准确性。 6. **动态性能**：具有71dB S/(N+D) 和83dB SFDR的出色性能，即使在5MHz的奈奎斯特输入频率下也能保持良好的信噪比和失真比。 7. **带宽**：100MHz全功率带宽，能够捕捉高频信号的变化。 8. **输入范围**：支持±2.048V、±1.024V 和±0.512V的双向输入范围，通过输入增益级（PGA）选择1x或2x的增益。 9. **输入结构**：独特的差分输入样本保持电路，可以采集单端或差分信号，并且具有高达75dB的共模抑制比（CMRR），有助于消除噪声干扰。 10. **输出逻辑供电**：支持单独的输出逻辑供电，便于与3V元件直接连接。 11. **封装形式**：采用28引脚窄体SSOP封装，紧凑且易于集成。 #### 三、应用领域 LTC1420因其出色的性能指标而被广泛应用于以下几个领域： 1. **电信**：在通信设备中作为前端模数转换模块，实现信号的高速数字化处理。 2. **数字信号处理**：用于DSP系统中的高速数据采集，如雷达信号处理等。 3. **多路复用数据采集系统**：适用于需要同时采集多个通道信号的应用场景。 4. **高速数据采集**：适用于对实时性和精度要求较高的工业控制和自动化系统。 5. **频谱分析**：用于无线通信、射频识别等场合的频谱监测和分析。 6. **成像系统**：在医疗成像、安防监控等应用中用于图像信号的采集和处理。 #### 四、典型应用示例图1所示为LTC1420的典型应用电路，展示了如何将该芯片集成到实际电路中。主要包括以下几个部分： 1. **模数转换器**：LTC1420的主芯片部分，负责模拟信号的数字化。 2. **参考电压源**：采用2.5V参考电压，适用于单电源供电模式。 3. **输入信号处理**：通过差分信号输入端口接收信号，并可通过内部PGA调节信号幅度。 4. **时钟输入**：提供10MHz时钟信号，用于同步采样过程。 5. **输出缓冲**：数字输出端口，通过外部逻辑供电，便于与后续电路连接。 6. **电源管理**：包括多个滤波电容，用于稳定电源电压，减少噪声干扰。 #### 五、总结 LTC1420是一款功能强大、性能稳定的模数转换器，适用于多种高速数据采集应用。其灵活的供电方式、低功耗设计、以及优秀的动态性能使其成为高速数据采集领域的理想选择。无论是电信、数字信号处理还是其他需要高速、高精度数据采集的应用场景，LTC1420都能提供可靠的技术支持。

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LTC1420

12-Bit, 10Msps,

Sampling ADC

The LTC

1420 is a 10Msps, 12-bit sampling A/D converter

that draws only 250mW from either single 5V or dual ±5V

supplies. This easy-to-use device includes a high dynamic

range sample-and-hold, a precision reference and a PGA

input circuit.

The LTC1420 has a flexible input circuit that allows full-

scale input ranges of ±2.048V ±1.024V and ±0.512V. The

input common mode voltage is arbitrary, though a 2.5V

reference is provided for single supply applications. The

input PGA has a digitally selectable 1x or 2x gain.

Maximum DC specs include ±1LSB INL and ±1LSB DNL

over temperature. Outstanding AC performance includes

71dB S/(N + D) and 83dB SFDR at the Nyquist input

frequency of 5MHz.

The unique differential input sample-and-hold can acquire

single-ended or differential input signals up to its 100MHz

bandwidth. The 75dB common mode rejection allows

users to eliminate ground loops and common mode noise

by measuring signals differentially from the source. A

separate output logic supply allows direct connection to

3V components.

■

10Msps Sample Rate

■

Single 5V Supply or

5V Supplies

■

Integral Nonlinearity Error <0.35LSB

■

Differential Nonlinearity <0.25LSB

■

71dB S/(N + D) and 83dB SFDR at Nyquist

■

100MHz Full-Power Bandwidth Sampling

■

±2.048V, ±1.024V and ±0.512V Bipolar Input Range

■

Input PGA

■

Out-of-Range Indicator

■

True Differential Inputs with 75dB CMRR

■

Power Dissipation: 250mW

■

28-Pin Narrow SSOP Package

■

Telecommunications

■

Digital Signal Processing

■

Multiplexed Data Acquisition Systems

■

High Speed Data Acquisition

■

Spectral Analysis

■

Imaging Systems

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

Typical INL Curve

CODE

0 1024 2048 3072 4096

INL (LSBs)

1420 TA02

1.00

0.75

0.50

0.25

–0.25

–0.50

–0.75

–1.00

DIGITAL CORRECTION

LOGIC

OUTPUT

BUFFERS

1420 TA01

MODE SELECT

PIPELINED 12-BIT ADCS/H

0V OR –5V

GAIN

28 7 23 22

OPTIONAL 3V

LOGIC SUPPLY

D11 (MSB)

D0 (LSB)

CLK

10MHz CLK

DIGITAL

OUTPUT

SENSE

REF

–A

–

24825 6

OGNDGNDGNDV

GND

2.048V

2.5V

REFERENCE

1µF

5V5V

1µF 1µF

1µF

FEATURES

DESCRIPTIO

APPLICATIO S

TYPICAL APPLICATIO

捷多邦，您值得信赖的PCB打样专家！

LTC1420

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

Analog Input Range (Note 9) V

REF

= 4.096V (SENSE = 0V), GAIN = 5V (1×) ● ±2.048 V

– (–A

REF

= 4.096V (SENSE = 0V), GAIN = 0V (2×) ● ±1.024 V

REF

= 2.048V (SENSE = V

REF

), GAIN = 5V (1×) ● ±1.024 V

REF

= 2.048V (SENSE = V

REF

), GAIN = 0V (2×) ● ±0.512 V

External V

REF

(SENSE = 5V), GAIN = 5V (1×) ● ±V

REF

/2 V

External V

REF

(SENSE = 5V), GAIN = 0V (2×) ● ±V

REF

/4 V

Analog Input Leakage Current ● ±20 µA

Analog Input Capacitance Between Conversions 12 pF

During Conversions 6 pF

ACQ

Sample-and-Hold Acquisition Time 30 ns

Sample-and-Hold Aperture Delay Time –250 ps

jitter

Sample-and-Hold Aperture Delay Time Jitter 0.6 ps

CMRR Analog Input Common Mode Rejection Ratio –2.048V < (–A

= +A

) < 2.048V 75 dB

ABSOLUTE AXI U RATI GS

PACKAGE/ORDER I FOR ATIO

UUW

= V

(Notes 1, 2)

Supply Voltage (V

)................................................. 6V

Negative Supply Voltage (V

) ................................ –6V

Total Supply Voltage (V

to V

) ........................... 12V

Analog Input Voltage

(Note 3) .............................(V

– 0.3V) to (V

+ 0.3V)

Digital Input Voltage

(Note 4) .............................(V

– 0.3V) to (V

+ 0.3V)

Digital Output Voltage........(V

– 0.3V) to (V

+ 0.3V)

Power Dissipation.............................................. 500mW

Operating Temperature Range

LTC1420C ............................................... 0°C to 70°C

LTC1420I............................................ –40°C to 85°C

Storage Temperature Range ................. –65°C to 150°C

Lead Temperature (Soldering, 10 sec)..................300°C

PARAMETER CONDITIONS MIN TYP MAX UNITS

Resolution (No Missing Codes) ● 12 Bits

Integral Linearity Error (Note 7) ● ±0.35 ±1 LSB

Differential Linearity Error ● ±0.25 ±1 LSB

Offset Error (Note 8) ±5 12 LSB

● 16 LSB

Full-Scale Error ±10 30 LSB

Full-Scale Tempco I

OUT(REF)

= 0 ±15 ppm/°C

ORDER PART

NUMBER

LTC1420CGN

LTC1420IGN

Consult factory for Military grade parts.

JMAX

= 110°C, θ

= 110°C/W

TOP VIEW

GN PACKAGE

28-LEAD PLASTIC SSOP

–A

SENSE

REF

GND

D11 (MSB)

D10

GAIN

CLK

GND

OGND

The ● denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at T

= 25°C. With Internal 4.096V Reference. Specifications are guaranteed for both

dual supply and single supply operation. (Note 5)

The ● denotes the specifications which apply over the full operating temperature range, otherwise

specifications are at T

= 25°C. Specifications are guaranteed for both dual supply and single supply operation. (Note 5)

CONVERTER CHARACTERISTICS

A ALOG I PUT

LTC1420

PARAMETER CONDITIONS MIN TYP MAX UNITS

Output Voltage I

OUT

= 0 2.475 2.50 2.525 V

Output Tempco I

OUT

= 0 ±15 ppm/°C

Line Regulation 4.75V ≤ V

≤ 5.25V 0.6 mV/V

–5.25V ≤ V

≤ –4.75V 0.03 mV/V

Output Resistance 0.1mA ≤ I

OUT

 ≤ 0.1mA 8 Ω

REF

Output Voltage SENSE = GND, I

OUT

= 0 4.096 V

SENSE = V

REF

, I

OUT

= 0 2.048 V

SENSE = V

Drive V

REF

with V

External Reference

REF

Output Tempco ±15 ppm/°C

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

S/(N + D) Signal-to-Noise Plus Distortion Ratio 1MHz Input Signal ● 68.5 71.4 dB

5MHz Input Signal

● 68 71.0 dB

THD Total Harmonic Distortion 1MHz Input Signal, First 5 Harmonics ● –84 –77 dB

5MHz Input Signal, First 5 Harmonics

● –81 –73 dB

SFDR Peak Harmonic or Spurious Noise 1MHz Input Signal ● –85 –78.5 dB

5MHz Input Signal

● –83 –75 dB

IMD Intermodulation Distortion f

IN1

= 29.37kHz, f

IN2

= 32.446kHz –80 dB

Full-Power Bandwidth 100 MHz

Input Referred Noise ±2.048V Input Range 0.22 LSB

RMS

±1.024V Input Range, 2x Mode (SENSE = GAIN = 0V) 0.33 LSB

RMS

Overvoltage Recovery Time 1.5x FS Input to 0 (Settling to 1LSB) 15 ns

Full-Scale Step Acquisition Time Settling to 1LSB 15 ns

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

High Level Input Voltage V

= 5.25V, V

= 0V ● 2.4 V

= 5.25V, V

= –5V ● 3.5 V

Low Level Input Voltage V

= 4.75V, V

= 0V ● 0.8 V

= 4.75V, V

= –5V ● 1V

Digital Input Current V

= 0V to V

● ±10 µA

Digital Input Capacitance 1.8 pF

High Level Output Voltage 0V

= 4.75V, I

= –10µA 4.74 V

= 4.75V, I

= –200µA ● 4.0 4.71 V

= 2.7V, I

= –10µA 2.6 V

= 2.7V, I

= –200µA ● 2.3 V

Low Level Output Voltage 0V

= 4.75V, I

= 160µA 0.05 V

= 4.75V, I

= 1.6mA ● 0.10 0.4 V

= 2.7V, I

= 160µA 0.05 V

= 2.7V, I

= 1.6mA ● 0.10 0.4 V

SOURCE

Output Source Current V

OUT

= 0V 50 mA

SINK

Output Sink Current V

OUT

= V

35 mA

The ● denotes the specifications which apply over the full

operating temperature range, otherwise specifications are at T

= 25°C. Specifications are guaranteed for both dual supply and single

supply operation. (Note 5)

= 25°C. Specifications are guaranteed for both dual supply and single supply operation. (Note 5)

The ● denotes the specifications which apply over the full operating temperature range,

otherwise specifications are at T

= 25°C. V

= 5V, V

= –5V, f

SAMPLE

= 10MHz, V

REF

= 4.096V. +A

= –0.1dBFS single ended input,

–A

= 0V. (Note 6)

DY A IC ACCURACY

INTERNAL REFERENCE CHARACTERISTICS

UU U

DIGITAL I PUTS A D DIGITAL OUTPUTS

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