TI ADS8556/7/8: 16-12位六通道同步采样ADC数据表

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"ADS8556是一款16位、14位或12位的六通道同步采样模拟数字转换器(DAC)，适用于多种高精度数据采集应用。" ADS8556是一款高性能的模拟数字转换器，设计用于在各种应用中实现精确的模拟信号数字化。这款器件的主要特点是其具有六个低功耗的SAR（逐次逼近寄存器）ADC，每个通道都具备真正的双极性输入，能够处理宽范围的模拟信号。ADS8556、ADS8557和ADS8558是这个家族的不同成员，分别提供16位、14位和12位的分辨率。该转换器的每个通道都包含一个比较器、采样保持(S/H)电路、差分模拟到数字转换器（CDAC）以及控制逻辑。这些组件协同工作，实现快速而准确的采样。ADS8556将ADCs分成了三对，每对由两个独立的SAR ADC组成，允许同时对多个输入信号进行采样，提高了系统数据吞吐率。转换器内部还集成了一个2.5V的参考电压源，确保了稳定且可重复的转换结果。I/O控制逻辑包括配置寄存器，用于设置转换器的各种操作参数。此外，该器件提供了灵活的接口选项，如串行和并行数据输出，以及硬件和软件触发模式，以适应不同的系统需求。 ADS8556的接口信号包括CONVST（转换启动）、CS/FS（片选/帧同步）、RD（读取）、WR（写入）、PAR/SER（并行/串行）、WORD/BYTE（字/字节选择），以及Busy/INT（忙/中断）状态指示，这些使能用户与设备进行有效通信。电源电压HVDD和BVDD提供ADC所需的工作电压，而BGND、AGND和HVSS则是接地引脚。该器件的其他特性包括待机模式（STBY）和复位（RESET）功能，可以实现低功耗操作和系统级重置。RANGE/XCLK引脚用于设置输入电压范围或提供外部时钟，这使得用户可以根据具体应用定制转换速率。 ADS8556是针对高精度多通道采样应用的理想选择，适用于工业自动化、测试与测量、医疗设备和数据采集系统等领域。结合TI提供的完整数据手册和应用支持，开发者可以充分利用这些特性来构建高效、精确的模拟数字转换解决方案。

ELECTRICAL CHARACTERISTICS: GENERAL

ADS8556

ADS8557

ADS8558

www.ti.com

............................................................................................................................................... SBAS404A – OCTOBER 2006 – REVISED AUGUST 2009

Over recommended operating free-air temperature range of – 40 ° C to +125 ° C, AVDD = 4.5V to 5.5V, BVDD = 2.7V to 5.5V,

HVDD = 10V to 15V, HVSS = – 15V to – 10V, V

REF

= 2.5V (internal), and f

DATA

= maximum, unless otherwise noted.

ADS8556, ADS8557, ADS8558

PARAMETER CONDITIONS MIN TYP

(1)

MAX UNIT

ANALOG INPUT

RANGE pin/RANGE bit = 0 – 4 × V

REF

+4 × V

REF

Bipolar full-scale range CHXX

RANGE pin/RANGE bit = 1 – 2 × V

REF

+2 × V

REF

Input range = ± 4 × V

REF

10 pF

Input capacitance

Input range = ± 2 × V

REF

20 pF

Input leakage current No ongoing conversion ± 1 µ A

Aperture delay 5 ns

Aperture delay matching Common CONVST for all channels 250 ps

Aperture jitter 50 ps

EXTERNAL CLOCK INPUT (XCLK)

External clock frequency f

XCLK

An external reference must be used for f

XCLK

> f

CCLK

1 18 20 MHz

External clock duty cycle 45 55 %

REFERENCE VOLTAGE OUTPUT (REF

OUT

)

2.5V operation, REFDAC = 0x3FF 2.485 2.5 2.515 V

2.5V operation, REFDAC = 0x3FF at +25 ° C 2.496 2.5 2.504 V

Reference voltage V

REF

3.0V operation, REFDAC = 0x3FF 2.985 3.0 3.015 V

3.0V operation, REFDAC = 0x3FF at +25 ° C 2.995 3.0 3.005 V

Reference voltage drift dV

REF

/dT ± 10 ppm/ ° C

Power-supply rejection ratio PSRR 73 dB

Output current I

REFOUT

DC current – 2 2 mA

Short-circuit current

(2)

REFSC

50 mA

Turn-on settling time t

REFON

10 ms

At CREF_x pins 4.7 10 µ F

External load capacitance

At REFIO pins 100 470 nF

Tuning range REFDAC Internal reference output voltage range 0.2 × V

REF

REFDAC resolution 10 Bits

REFDAC differential nonlinearity DNL

DAC

– 1 ± 0.1 1 LSB

REFDAC integral nonlinearity INL

DAC

– 2 ± 0.1 2 LSB

REFDAC offset error V

OSDAC

REF

= 0.5V (DAC = 0x0CC) – 4 ± 0.65 4 LSB

REFERENCE VOLTAGE INPUT (REF

)

Reference input voltage V

REFIN

0.5 2.5 3.025 V

Input resistance 100 M Ω

Input capacitance 5 pF

Reference input current 1 µ A

SERIAL CLOCK INPUT (SCLK)

Serial clock input frequency f

SCLK

0.1 36 MHz

Serial clock period t

SCLK

0.0278 10 µ s

Serial clock duty cycle 40 60 %

DIGITAL INPUTS

(3)

Logic family CMOS with Schmitt-Trigger

High-level input voltage 0.7 × BVDD BVDD + 0.3 V

Low-level input voltage BGND – 0.3 0.3 × BVDD V

Input current V

= BVDD to BGND – 50 +50 nA

Input capacitance 5 pF

(1) All values are at T

= +25 ° C.

(2) Reference output current is not limited internally.

(3) Specified by design.

Product Folder Link(s): ADS8556 ADS8557 ADS8558

ADS8556

ADS8557

ADS8558

SBAS404A – OCTOBER 2006 – REVISED AUGUST 2009 ...............................................................................................................................................

www.ti.com

ELECTRICAL CHARACTERISTICS: GENERAL (continued)

Over recommended operating free-air temperature range of – 40 ° C to +125 ° C, AVDD = 4.5V to 5.5V, BVDD = 2.7V to 5.5V,

HVDD = 10V to 15V, HVSS = – 15V to – 10V, V

REF

= 2.5V (internal), and f

DATA

= maximum, unless otherwise noted.

ADS8556, ADS8557, ADS8558

PARAMETER CONDITIONS MIN TYP

(1)

MAX UNIT

DIGITAL OUTPUTS

(4)

Logic family CMOS

High-level output voltage I

= 100 µ A BVDD – 0.6 BVDD V

Low-level output voltage I

= – 100 µ A BGND BGND + 0.4 V

High-impedance-state output current – 50 50 nA

Output capacitance 5 pF

Load capacitance 30 pF

POWER-SUPPLY REQUIREMENTS

Analog supply voltage AVDD 4.5 5.0 5.5 V

Buffer I/O supply voltage BVDD 2.7 3.0 5.5 V

Input positive supply voltage HVDD 5.0 10.0 16.5 V

Input negative supply voltage HVSS – 16.5 – 10.0 – 5.0 V

DATA

= maximum 30.0 36.0 mA

ADS8556, f

DATA

= 250kSPS (auto-NAP mode) 14.0 16.5 mA

ADS8557, f

DATA

= 250kSPS (auto-NAP mode) 14.0 17.0 mA

Analog supply current

(5)

IAVDD

ADS8558, f

DATA

= 250kSPS (auto-NAP mode) 14.0 18.0 mA

Auto-NAP mode, no ongoing conversion,

4.0 6.0 mA

internal conversion clock

Power-down mode 0.1 50.0 µ A

DATA

= maximum 0.9 2.0 mA

DATA

= 250kSPS (auto-NAP mode) 0.5 1.5 mA

Buffer I/O supply current

(6)

IBVDD

Auto-NAP mode, no ongoing conversion,

0.1 10.0 µ A

internal conversion clock

Power-down mode 0.1 10.0 µ A

ADS8556, f

DATA

= maximum 3.0 3.5 mA

ADS8557, f

DATA

= maximum 3.1 3.6 mA

ADS8558, f

DATA

= maximum 3.3 4.0 mA

Input positive supply current

(7)

IHVDD

DATA

= 250kSPS (auto-NAP mode) 1.6 2.0 mA

Auto-NAP mode, no ongoing conversion,

0.2 0.3 µ A

internal conversion clock

Power-down mode 0.1 10.0 µ A

ADS8556, f

DATA

= maximum 3.6 4.0 mA

ADS8557, f

DATA

= maximum 3.6 4.2 mA

ADS8558, f

DATA

= maximum 4.0 4.8 mA

Input negative supply current

(8)

IHVSS

DATA

= 250kSPS (auto-NAP mode) 1.8 2.2 mA

Auto-NAP mode, no ongoing conversion,

0.2 0.25 µ A

internal conversion clock

Power-down mode 0.1 10.0 µ A

(4) Specified by design.

(5) At AVDD = 5V.

(6) At BVDD = 3V, parallel mode, load capacitance = 6pF/pin.

(7) At HVDD = 15V.

(8) At HVSS = – 15V.

Product Folder Link(s): ADS8556 ADS8557 ADS8558

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