ADI公司的AD5758是單路電壓和電流輸出的16位數(shù)模轉(zhuǎn)器(DAC),工作電壓從-33V (AVSS)到+33V(AVDD1),16位性能,片上有診斷功能包括12位ADC,用戶可編失調(diào)和增益,電流輸出范圍0 mA - 20 mA, 4 mA - 20 mA, 0 mA - 24 mA, ±20 mA, ±24 mA, ?1 mA - +22 mA ,電壓輸出范圍0 V - 5 V, 0 V - 10 V, ±5 V和±10 V,工作溫度范圍?40°C 到 +11°5C,主要用在過程控制,激勵(lì)器控制,通路隔離的模擬輸出,可編邏輯控制器(PLC)和分布式控制系統(tǒng)(DCS)以及HART網(wǎng)絡(luò)連接.本文介紹AD5758產(chǎn)品亮點(diǎn)和主要特性,功能框圖以及評估板EVAL-AD5758SDZ主要特性,電路圖,材料清單和PCB設(shè)計(jì)圖.

The AD5758 is a single-channel, voltage and current output digital- to-analog converter (DAC) that operates with a power supply range from ?33 V (minimum) on AVSS to +33 V (maximum) on AVDD1 with a maximum operating voltage between the two rails of 60 V. On-chip dynamic power control (DPC) minimizes package power dissipation, which is achieved by regulating the supply voltage (VDPC+) to the VIOUT output driver circuitry from 5 V to 27 V using a buck dc-to-dc converter, optimized for minimum on-chip power dissipation. The CHART pin enables a HART? signal to be coupled onto the current output. The device uses a versatile 4-wire serial peripheral interface (SPI) that operates at clock rates of up to 50 MHz and is compatible with standard SPI, QSPI?, MICROWIRE?, DSP, and microcontroller interface standards. The interface also features an optional SPI cyclic redundancy check (CRC) and a watchdog timer (WDT). The AD5758 offers improved diagnostic features from its predecessors, such as output current monitoring and an integrated 12-bit diagnostic analog-to-digital converter (ADC). Additional robustness is provided by the inclusion of a fault protection switch on the VIOUT, +VSENSE, and ?VSENSE pins.

AD5758產(chǎn)品亮點(diǎn):

1. Range of diagnostic features, including integrated ADC.

2. DPC, using an integrated buck dc-to-dc converter for thermal management, enabling higher channel count in smaller size module housing.

3. Programmable power control (PPC) mode to enable faster settling time (15 μs typical).

4. 16-bit performance.

5. HART compliant.

AD5758主要特性:

16-bit resolution and monotonicity

DPC for thermal management

Current/voltage output available on a single terminal

Current output ranges: 0 mA to 20 mA, 4 mA to 20 mA, 0 mA to 24 mA, ±20 mA, ±24 mA, ?1 mA to +22 mA

Voltage output ranges (with 20% overrange): 0 V to 5 V, 0 V to 10 V, ±5 V, and ±10 V User-programmable offset and gain

Advanced on-chip diagnostics, including a 12-bit ADC

On-chip reference

Robust architecture, including output fault protection

?40°C to +11°5C temperature range

32-lead, 5 mm × 5 mm LFCSP package

AD5758應(yīng)用:

Process control

Actuator control

Channel isolated analog outputs

Programmable logic controller (PLC) and distributed control systems (DCS) applications

HART network connectivity

圖1. AD5758功能框圖

評估板EVAL-AD5758SDZ

This user guide describes the evaluation board for the AD5758, a functional safety certified, single-channel, voltage and current output, digital-to-analog converter (DAC) with on-chip dynamic power control (DPC) that minimizes package power dissipation. For full details on the AD5758, refer to the AD5758 data sheet. Consult the data sheet when using the EVAL-AD5758SDZ. The configuration of the various link options is explained in the Evaluation Board Hardware section. The installation of the companion software is discussed in the Software Quick Start Procedures section. The EVAL-AD5758SDZ, shown in Figure 1, requires the EVAL- SDP-CS1Z board. The EVAL-AD5758SDZ interfaces to the USB port of the PC via the EVAL-SDP-CS1Z board. Software that allows the user to easily program the AD5758, namely the Analysis|Control|Evaluation (ACE) software, is available with the EVAL-AD5758SDZ.

評估板EVAL-AD5758SDZ主要特性:

Full featured evaluation board for the AD5758

On-board 2.5 V ADR4525 reference

SPI ACE software for control

EVALUATION KIT CONTENTS

EVAL-AD5758SDZ evaluation board

EVAL-SDP-CS1Z

圖2. 評估板EVAL-AD5758SDZ外形圖

圖3. 評估板EVAL-AD5758SDZ電路圖(1):AD5758

圖4. 評估板EVAL-AD5758SDZ電路圖(2):AD5758電源和基準(zhǔn)選擇

圖5. 評估板EVAL-AD5758SDZ電路圖(3):SDP-S板連接,地址引腳和LDAC和RESET引腳

圖6. 評估板EVAL-AD5758SDZ電路圖(4):AD5758輸出級

評估板EVAL-AD5758SDZ材料清單:

圖7. 評估板EVAL-AD5758SDZPCB設(shè)計(jì)圖(1):頂層

圖8. 評估板EVAL-AD5758SDZPCB設(shè)計(jì)圖(2):層1

圖9. 評估板EVAL-AD5758SDZPCB設(shè)計(jì)圖(3):地和電源面,層2和層3

圖10. 評估板EVAL-AD5758SDZPCB設(shè)計(jì)圖(4):層4