SPI接口的12位DACMCP4921._mcp4921spi通信资源-CSDN文库

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### SPI 接口的12位DAC MCP4921 关键知识点解析 #### 一、产品概述 **MCP4921/4922** 是Microchip Technology Inc.设计并生产的高精度12位数字模拟转换器（Digital-to-Analog Converter, DAC）。这些器件具备低功耗特性，并且支持SPI接口通信。MCP492X系列适用于多种工业应用场合，如传感器校准、电机反馈回路控制等。 #### 二、主要特点 1. **12位分辨率**：提供高精度的模拟信号输出。 2. **DNL (Differential Nonlinearity)**：典型值为±0.2LSB，保证了良好的线性度。 3. **INL (Integral Nonlinearity)**：典型值为±2LSB，进一步确保了输出信号的质量。 4. **单通道或双通道**：用户可以根据实际需求选择不同的配置。 5. **轨到轨输出**：能够实现全范围的电压输出。 6. **SPI接口**：兼容标准SPI协议，最高支持20MHz时钟频率。 7. **快速建立时间**：仅需4.5μs即可完成转换过程。 8. **可选增益输出**：支持1倍或2倍增益模式。 9. **450kHz乘法器模式**：适用于高速乘法/除法操作。 10. **外部参考电压输入**：提供更灵活的参考电压设置选项。 11. **2.7V至5.5V单电源供电**：适应广泛的工作电压范围。 12. **工作温度范围广**：-40°C至+125°C，适合各种恶劣环境。 #### 三、典型应用 1. **设定点或偏置调整**：在自动控制系统中调整基准值。 2. **传感器校准**：用于精确测量的压力、温度、湿度等传感器校正。 3. **数字控制的乘法器/分频器**：适用于信号处理系统。 4. **便携式仪器（电池供电）**：如便携式测试设备。 5. **电机反馈回路控制**：用于精密电机驱动和控制。 #### 四、内部结构与工作原理 - **电阻串架构**：采用电阻串架构，具备低DNL误差、低比率温度系数及快速建立时间的优点。 - **双缓冲输入**：通过LDAC引脚实现双DAC同时更新。 - **上电复位电路**：确保可靠启动。 #### 五、封装类型 MCP492X系列提供多种封装选项： - **MCP4921**：8引脚PDIP、SOIC、MSOP封装。 - **MCP4922**：14引脚PDIP、SOIC、TSSOP封装。 #### 六、电气特性 - **绝对最大额定值**： - VDD：6.5V - 所有输入端：VDD + 0.3V至AVSS - 0.3V - 输出端：VDD + 0.3V至AVSS - 0.3V #### 七、SPI接口说明 - **SPI接口**：支持标准SPI协议，具备20MHz时钟支持能力。 - **引脚定义**： - CS：片选信号 - SCK：时钟信号 - SDI：串行数据输入 - LDAC：同步锁存信号 - VDD：电源正极 - AVSS：模拟地 - VOUTA/B：模拟输出端 - VREF：参考电压输入端 #### 八、性能优势 - **高精度与低噪声**：MCP492X系列特别适用于需要高精度信号处理的应用场景。 - **宽温度范围**：能够在极端温度环境下稳定工作，适用于各种工业应用场景。 - **低功耗**：适用于电池供电的便携式设备。 #### 九、结论 MCP4921/4922是高性能的12位DAC，具有出色的线性度和稳定性，支持广泛的电压范围和温度范围，适用于多种工业应用场合。其内置的SPI接口和灵活的封装选项使得集成变得非常方便。无论是对于需要高精度模拟信号输出的应用还是对功耗敏感的便携式设备来说，MCP492X系列都是一个理想的选择。

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 2004 Microchip Technology Inc. DS21897A-page 1

MCP4921/4922

Features

•12-Bit Resolution

• ±0.2 LSB DNL (typ)

• ±2 LSB INL (typ)

• Single or Dual Channel

• Rail-to-Rail Output

• SPI™ Interface with 20 MHz Clock Support

• Simultaneous Latching of the Dual DACs w/LDAC

• Fast Settling Time of 4.5 µs

• Selectable Unity or 2x Gain Output

• 450 kHz Multiplier Mode

•External V

REF

Input

• 2.7V to 5.5V Single-Supply Operation

• Extended Temperature Range: -40°C to +125°C

Applications

• Set Point or Offset Trimming

• Sensor Calibration

• Digitally-Controlled Multiplier/Divider

• Portable Instrumentation (Battery-Powered)

• Motor Feedback Loop Control

Block Diagram

Description

The Microchip Technology Inc. MCP492X are 2.7 –

5.5V, low-power, low DNL, 12-Bit Digital-to-Analog Con-

verters (DACs) with optional 2x buffered output and SPI

interface.

The MCP492X are DACs that provide high accuracy

and low noise performance for industrial applications

where calibration or compensation of signals (such as

temperature, pressure and humidity) are required.

The MCP492X are available in the extended tempera-

ture range and PDIP, SOIC, MSOP and TSSOP

packages.

The MCP492X devices utilize a resistive string archi-

tecture, with its inherent advantages of low DNL error,

low ratio metric temperature coefficient and fast settling

time. These devices are specified over the extended

temperature range. The MCP492X include double-

buffered inputs, allowing simultaneous updates using

the LDAC

pin. These devices also incorporate a

Power-On Reset (POR) circuit to ensure reliable

power-up.

Package Types

Op Amps

CS SDI SCK

Interface Logic

Input

DAC

String

DAC

String

DAC

REF

Output

Logic

Power-on

Reset

REF

OUTA

OUTB

LDAC

Buffer

SHDN

Output

Gain

Logic

Gain

Logic

MCP4921

8-Pin PDIP, SOIC, MSOP

SCK

SDI

OUTA

REFA

LDAC

MCP4922

14-Pin PDIP, SOIC, TSSOP

SCK

REFB

SDI

LDAC

SHDN

OUTB

OUTA

REFA

12-Bit DAC with SPI™ Interface

MCP4921/4922

DS21897A-page 2  2004 Microchip Technology Inc.

1.0 ELECTRICAL

CHARACTERISTICS

Absolute Maximum Ratings †

............................................................................................................. 6.5V

All inputs and outputs w.r.t ............. AV

–0.3V to V

+0.3V

Current at Input Pins ....................................................±2 mA

Current at Supply Pins ...............................................±50 mA

Current at Output Pins ...............................................±25 mA

Storage temperature .....................................-65°C to +150°C

Ambient temp. with power applied ................-55°C to +125°C

ESD protection on all pins ...........≥ 4 kV (HBM), ≥ 400V (MM)

Maximum Junction Temperature (T

)..........................+150°C

† Notice: Stresses above those listed under “Maximum Rat-

ings” may cause permanent damage to the device. This is a

stress rating only and functional operation of the device at

those or any other conditions above those indicated in the

operational listings of this specification is not implied. Expo-

sure to maximum rating conditions for extended periods may

affect device reliability.

5V AC/DC CHARACTERISTICS

Electrical Specifications: Unless otherwise indicated, V

= 5V, AV

= 0V, V

REF

= 2.048V, output buffer gain (G) = 2x, R

= 5 kΩ

to GND, C

= 100 pF T

= -40 to +85°C. Typical values at +25°C.

Parameters Sym Min Typ Max Units Conditions

Power Requirements

Input Voltage V

2.7 — 5.5

Input Current - MCP4921

Input Current - MCP4922

—

175

350

700

µA Input unbuffered, digital inputs

grounded, output unloaded,

code at 0x000

Hardware Shutdown Current I

SHDN

—0.3 2 µA

Software Shutdown Current I

SHDN_SW

—3.3 6 µA

Power-on-Reset Threshold V

POR

—2.0 — V

DC Accuracy

Resolution n 12 — — Bits

INL Error INL -12 2 12 LSB

DNL DNL -0.75 ±0.2 +0.75 LSB Device is Monotonic

Offset Error V

— ±0.02 1 % of FSR Code 0x000h

Offset Error Temperature

Coefficient

/°C — 0.16 — ppm/°C -45°C to 25°C

— -0.44 — ppm/°C +25°C to 85°C

Gain Error g

— -0.10 1 % of FSR Code 0xFFFh, not including offset

error.

Gain Error Temperature

Coefficient

∆G/°C — -3 — ppm/°C

Input Amplifier (V

REF

Input)

Input Range - Buffered Mode V

REF

0.040 — V

– 0.040 V Note 1

Code = 2048

REF

= 0.2v p-p, f = 100 Hz and 1 kHz

Input Range - Unbuffered

Mode

REF

0— V

Input Impedance R

VREF

— 165 — kΩ Unbuffered Mode

Input Capacitance -

Unbuffered Mode

VREF

—7 — pF

Multiplier Mode

-3 dB Bandwidth

VREF

— 450 — kHz V

REF

= 2.5V ±0.2Vp-p, Unbuffered,

G = 1

VREF

— 400 — kHz V

REF

= 2.5V ±0.2 Vp-p, Unbuffered,

G = 2

Multiplier Mode -

Total Harmonic Distortion

THD

VREF

—-73 — dBV

REF

= 2.5V ±0.2Vp-p,

Frequency = 1 kHz

Note 1: By design, not production tested.

2: Too small to quantify.

 2004 Microchip Technology Inc. DS21897A-page 3

MCP4921/4922

Output Amplifier

Output Swing V

OUT

— 0.010

to V

– 0.040

— Accuracy is better than 1 LSB for

OUT

= 10 mV to (V

– 40 mV)

Phase Margin

θm — 66 — degrees

Slew Rate SR — 0.55 — V/µs

Short Circuit Current I

—15 24 mA

Settling Time t

settling

— 4.5 — µs Within 1/2 LSB of final value from 1/4

to 3/4 full-scale range

Dynamic Performance

DAC-to-DAC Crosstalk — 10 — nV-s Note 2

Major Code Transition Glitch — 45 — nV-s 1 LSB change around major carry

(0111...1111 to 1000...0000)

Digital Feedthrough — 10 — nV-s Note 2

Analog Crosstalk — 10 — nV-s Note 2

5V AC/DC CHARACTERISTICS (CONTINUED)

Electrical Specifications: Unless otherwise indicated, V

= 5V, AV

= 0V, V

REF

= 2.048V, output buffer gain (G) = 2x, R

= 5 kΩ

to GND, C

= 100 pF T

= -40 to +85°C. Typical values at +25°C.

Parameters Sym Min Typ Max Units Conditions

Note 1: By design, not production tested.

2: Too small to quantify.

3V AC/DC CHARACTERISTICS

Electrical Specifications: Unless otherwise indicated, V

= 3V, AV

= 0V, V

REF

= 2.048V external, output buffer gain (G) = 1x,

= 5 kΩ to GND, C

= 100 pF T

= -40 to +85°C. Typical values at 25°C

Parameters Sym Min Typ Max Units Conditions

Power Requirements

Input Voltage V

2.7 — 5.5

Input Current - MCP4921

Input Current - MCP4922

—

125

250

500

µA Input unbuffered, digital inputs

grounded, output unloaded,

code at 0x000

Hardware Shutdown Current I

SHDN

—0.25 2 µA

Software Shutdown Current I

SHDN_SW

—2 6 µA

Power-On Reset threshold V

POR

—2.0 — V

DC Accuracy

Resolution n 12 — — Bits

INL Error INL -12 ±3 +12 LSB

DNL DNL -0.75 ±0.3 +0.75 LSB Device is Monotonic

Offset Error V

— ±0.02 1 % of FSR Code 0x000h

Offset Error Temperature

Coefficient

/°C — 0.5 — ppm/°C -45°C to 25°C

— -0.77 — ppm/°C +25°C to 85°C

Gain Error g

— -0.15 1 % of FSR Code 0xFFFh, not including offset

error.

Gain Error Temperature

Coefficient

∆G/°C — -3 — ppm/°C

Input Amplifier (V

REF

Input)

Input Range - Buffered Mode V

REF

0.040 — V

-0.040 V Note 1

Code = 2048,

REF

= 0.2v p-p, f = 100 Hz and 1 kHz

Input Range - Unbuffered

Mode

REF

0— V

Input Impedance R

VREF

— 165 — kΩ Unbuffered Mode

Note 1: By design, not production tested.

2: Too small to quantify.

MCP4921/4922

DS21897A-page 4  2004 Microchip Technology Inc.

Input Capacitance –

Unbuffered Mode

VREF

—7 — pF

Multiplier Mode

-3 dB Bandwidth

VREF

— 440 — kHz V

REF

= 2.048V ±0.1 Vp-p, unbuffered,

G = 1

VREF

— 390 — kHz V

REF

= 2.048V ±0.1 Vp-p, unbuffered,

G = 2

Multiplier Mode –

Total Harmonic Distortion

THD

VREF

—-73 — dBV

REF

= 2.5V ±0.1 Vp-p,

Frequency = 1 kHz

Output Amplifier

Output Swing V

OUT

— 0.010

to V

– 0.040

— Accuracy is better than 1 LSB for

OUT

= 10 mV to (V

– 40 mV)

Phase Margin

θm — 66 — degrees

Slew Rate SR — 0.55 — V/µs

Short Circuit Current I

—14 24 mA

Settling Time t

settling

— 4.5 — µs Within 1/2 LSB of final value from 1/4

to 3/4 full-scale range

Dynamic Performance

DAC-to-DAC Crosstalk — 10 — nV-s Note 2

Major Code Transition Glitch — 45 — nV-s 1 LSB change around major carry

(0111...1111 to 1000...0000)

Digital Feedthrough — 10 — nV-s Note 2

Analog Crosstalk — 10 — nV-s Note 2

3V AC/DC CHARACTERISTICS (CONTINUED)

Electrical Specifications: Unless otherwise indicated, V

= 3V, AV

= 0V, V

REF

= 2.048V external, output buffer gain (G) = 1x,

= 5 kΩ to GND, C

= 100 pF T

= -40 to +85°C. Typical values at 25°C

Parameters Sym Min Typ Max Units Conditions

Note 1: By design, not production tested.

2: Too small to quantify.

5V EXTENDED TEMPERATURE SPECIFICATIONS

Electrical Specifications: Unless otherwise indicated, V

= 5V, AV

= 0V, V

REF

= 2.048V, output buffer gain (G) = 2x, R

= 5 kΩ

to GND, C

= 100 pF. Typical values at +125°C by characterization or simulation.

Parameters Sym Min Typ Max Units Conditions

Power Requirements

Input Voltage V

2.7 — 5.5

Input Current - MCP4921

Input Current - MCP4922

—

200

400

—

µA Input unbuffered, digital inputs

grounded, output unloaded,

code at 0x000

Hardware Shutdown Current I

SHDN

—1.5— µA

Software Shutdown Current I

SHDN_SW

—5— µA

Power-On Reset threshold V

POR

—1.85— V

DC Accuracy

Resolution n 12 — — Bits

INL Error INL — ±4 — LSB

DNL DNL — ±0.25 — LSB Device is Monotonic

Offset Error V

— ±0.02 — % of FSR Code 0x000h

Offset Error Temperature

Coefficient

/°C — -5 — ppm/°C +25°C to +125°C

Note 1: By design, not production tested.

2: Too small to quantify.

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格拉子

2014-04-26

对资源描述不清晰，本资源是英文版数据手册,即datasheet。microchip官网上有mcp4921中文版和英文版手册。这种官方资源就不要扣积分了好吧

wangbenqing

粉丝: 1
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