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-0.05

-0.03

-0.01

0.01

0.03

0.05

±40 ±7

26 59 92 125

Gain (% FS)

Free-Air Temperature (

C039

---- ± 2.5*V

REF,

----  1.25*V

REF

----  0.625*V

REF,

------0.3125*V

REF

-------0.156 V

REF,

---- + 2.5*V

REF

---- + 1.25*V

REF,

---- + 0.625*V

REF

---- + 0.3125*V

REF

Multiplexer

Oscillator

SCLK

SDI

SDO

DAISY

REFSEL

RST/PD

REFCAP

REFIO

PGA

1 M:

OVP

1 M:

2nd-Order

LPF

ADC

Driver

AIN_0P

AIN_0GND

OVP

PGA

1 M:

OVP

1 M:

2nd-Order

LPF

ADC

Driver

AIN_1P

AIN_1GND

OVP

PGA

1 M:

OVP

1 M:

2nd-Order

LPF

ADC

Driver

AIN_2P

AIN_2GND

OVP

PGA

1 M:

OVP

1 M:

2nd-Order

LPF

ADC

Driver

AIN_3P

AIN_3GND

OVP

PGA

1 M:

OVP

1 M:

2nd-Order

LPF

ADC

Driver

AIN_4P

AIN_4GND

OVP

PGA

1 M:

OVP

1 M:

2nd-Order

LPF

ADC

Driver

AIN_5P

AIN_5GND

OVP

PGA

1 M:

OVP

1 M:

2nd-Order

LPF

ADC

Driver

AIN_6P

AIN_6GND

OVP

PGA

1 M:

OVP

1 M:

2nd-Order

LPF

ADC

Driver

AIN_7P

AIN_7GND

OVP

AUX_IN

AUX_GND

14-Bit

SAR ADC

Digital

Logic

and

Interface

4.096-V

Reference

REFGND

DGNDAGND

DVDD

AVDD

Additional Channels in ADS8678

ADS8678

ADS8674

ALARM

Product

Folder

Sample &

Buy

Technical

Documents

Tools &

Software

Support &

Community

Reference

Design

ADS8674

ADS8678

SBAS627 –JULY 2015

ADS867x 14-Bit, 500-kSPS, 4- and 8-Channel, Single-Supply, SAR ADCs with

Bipolar Input Ranges

1 Features 2 Applications

• 14-Bit ADCs with Integrated Analog Front-End

• Power Automation

• 4-, 8-Channel MUX with Auto and Manual Scan • Protection Relays

• Channel-Independent Programmable Inputs: • PLC Analog Input Modules

– ±10.24 V, ±5.12 V, ±2.56 V, ±1.28 V, ±0.64 V

3 Description

– 10.24 V, 5.12 V, 2.56 V, 1.28 V

The ADS8674 and ADS8678 are 4- and 8-channel,

• 5-V Analog Supply: 1.65-V to 5-V I/O Supply

integrated data acquisition systems based on a 14-bit

• Constant Resistive Input Impedance: 1 MΩ

successive approximation (SAR) analog-to-digital

converter (ADC), operating at a throughput of

• Input Overvoltage Protection: Up to ±20 V

500 kSPS. The devices feature integrated analog

• On-Chip, 4.096-V Reference with Low Drift

front-end circuitry for each input channel with

• Excellent Performance:

overvoltage protection up to ±20 V, a 4- or 8-channel

multiplexer with automatic and manual scanning

– 500-kSPS Aggregate Throughput

modes, and an on-chip, 4.096-V reference with low

– DNL: ±0.2 LSB; INL: ±0.25 LSB

temperature drift. Operating on a single 5-V analog

– Low Drift for Gain Error and Offset

supply, each input channel on the devices can

– SNR: 85 dB; THD: –100 dB

support true bipolar input ranges of ±10.24 V,

±5.12 V, ±2.56 V, ±1.28V and ±0.64V, as well as

– Low Power: 65 mW

unipolar input ranges of 0 V to 10.24 V, 0 V to 5.12 V,

• AUX Input → Direct Connection to ADC Inputs

0 V to 2.56 V and 0 V to 1.28 V. The gain of the

• ALARM → High and Low Thresholds per Channel

analog front-end for all input ranges is accurately

trimmed to ensure a high dc precision. The input

• SPI™-Compatible Interface with Daisy-Chain

range selection is software-programmable and

• Industrial Temperature Range: –40°C to 125°C

independent for each channel. The devices offer a

• TSSOP-38 Package (9.7 mm × 4.4 mm)

1-MΩ constant resistive input impedance irrespective

of the selected input range.

Block Diagram

The ADS8674 and ADS8678 offer a simple SPI-

compatible serial interface to the digital host and also

support daisy-chaining of multiple devices. The digital

supply operates from 1.65 V to 5.25 V, enabling

direct interface to a wide range of host controllers.

Device Information

(1)

PART NUMBER PACKAGE BODY SIZE (NOM)

ADS867x TSSOP (38) 9.70 mm × 4.40 mm

(1) For all available packages, see the orderable addendum at

the end of the datasheet.

Gain Error versus Temperature

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

ADS8674

ADS8678

SBAS627 –JULY 2015

www.ti.com

Table of Contents

8.4 Device Functional Modes........................................ 36

1 Features.................................................................. 1

8.5 Register Maps......................................................... 49

2 Applications ........................................................... 1

9 Application and Implementation ........................ 65

3 Description ............................................................. 1

9.1 Application Information............................................ 65

4 Revision History..................................................... 2

9.2 Typical Applications ................................................ 65

5 Device Comparison Table..................................... 3

10 Power-Supply Recommendations ..................... 68

6 Pin Configuration and Functions......................... 3

11 Layout................................................................... 69

7 Specifications......................................................... 5

11.1 Layout Guidelines ................................................. 69

7.1 Absolute Maximum Ratings ...................................... 5

11.2 Layout Example .................................................... 70

7.2 ESD Ratings.............................................................. 5

12 Device and Documentation Support ................. 71

7.3 Recommended Operating Conditions....................... 5

12.1 Documentation Support ........................................ 71

7.4 Thermal Information.................................................. 5

12.2 Related Links ........................................................ 71

7.5 Electrical Characteristics........................................... 6

12.3 Community Resources.......................................... 71

7.6 Timing Requirements: Serial Interface.................... 10

12.4 Trademarks........................................................... 71

7.7 Typical Characteristics............................................ 11

12.5 Electrostatic Discharge Caution............................ 71

8 Detailed Description............................................ 22

12.6 Glossary................................................................ 71

8.1 Overview ................................................................. 22

13 Mechanical, Packaging, and Orderable

8.2 Functional Block Diagram ....................................... 22

Information ........................................................... 72

8.3 Feature Description................................................. 23

4 Revision History

DATE REVISION NOTES

July 2014 * Initial release.

Product Folder Links: ADS8674 ADS8678

SCLK

SDO

ALARM

DVDD

DGND

AGND

SDI

RST/PD

DAISY

REFSEL

REFIO

REFGND

REFCAP

AVDD

AGND

AIN_5P

AIN_5GND

AIN_4P

AIN_4GND

9AVDD

AUX_IN

AUX_GND

AIN_6P

AIN_6GND

AIN_7P

AIN_7GND

AIN_3P

AIN_3GND

AIN_2P

AIN2_GND

AIN_0P

AIN_0GND

AIN_1P

AIN_1GND

AGND

ADS8678

SCLK

SDO

ALARM

DVDD

DGND

AGND

SDI

RST/PD

DAISY

REFSEL

REFIO

REFGND

REFCAP

AVDD

AGND

9AVDD

AUX_IN

AUX_GND

AIN_3P

AIN_3GND

AIN_2P

AIN2_GND

AIN_0P

AIN_0GND

AIN_1P

AIN_1GND

AGND

ADS8674

ADS8678

www.ti.com

SBAS627 –JULY 2015

5 Device Comparison Table

PRODUCT RESOLUTION (Bits) CHANNELS SAMPLE RATE (kSPS)

ADS8674 14 4, single-ended 500

ADS8678 14 8, single-ended 500

6 Pin Configuration and Functions

DBT Package

38-Pin TSSOP

Top View (Not to Scale)

Pin Functions

NAME I/O DESCRIPTION

NO.

ADS8674 ADS8678

1 SDI Digital input Data input for serial communication.

Active low logic input.

2 RST/PD Digital input

Dual functionality to reset or power-down the device.

3 DAISY Digital input Chain the data input during serial communication in daisy-chain mode.

Active low logic input to enable the internal reference.

When low, the internal reference is enabled;

4 REFSEL Digital input REFIO becomes an output that includes the V

REF

voltage.

When high, the internal reference is disabled;

REFIO becomes an input to apply the external V

REF

voltage.

5 REFIO Analog input, output Internal reference output and external reference input pin. Decouple with REFGND on pin 6.

Reference GND pin; short to the analog GND plane.

6 REFGND Power supply

Decouple with REFIO on pin 5 and REFCAP on pin 7.

7 REFCAP Analog output ADC reference decoupling capacitor pin. Decouple with REFGND on pin 6.

8 AGND Power supply Analog ground pin. Decouple with AVDD on pin 9.

9 AVDD Power supply Analog supply pin. Decouple with AGND on pin 8.

10 AUX_IN Analog input Auxiliary input channel: positive input. Decouple with AUX_GND on pin 11.

11 AUX_GND Analog input Auxiliary input channel: negative input. Decouple with AUX_IN on pin 10.

Product Folder Links: ADS8674 ADS8678

ADS8674

ADS8678

SBAS627 –JULY 2015

www.ti.com

Pin Functions (continued)

NAME I/O DESCRIPTION

NO.

ADS8674 ADS8678

Analog input channel 6, positive input. Decouple with AIN_6GND on pin 13.

12 NC AIN_6P Analog input

No connection for the ADS8674; this pin can be left floating or connected to AGND.

Analog input channel 6, negative input. Decouple with AIN_6P on pin 12.

13 NC AIN_6GND Analog input

No connection for the ADS8674; this pin can be left floating or connected to AGND.

Analog input channel 7, positive input. Decouple with AIN_7GND on pin 15.

14 NC AIN_7P Analog input

No connection for the ADS8674; this pin can be left floating or connected to AGND.

Analog input channel 7, negative input. Decouple with AIN_7P on pin 14.

15 NC AIN_7GND Analog input

No connection for the ADS8674; this pin can be left floating or connected to AGND.

16 AIN_0P Analog input Analog input channel 0, positive input. Decouple with AIN_0GND on pin 17.

17 AIN_0GND Analog input Analog input channel 0, negative input. Decouple with AIN_0P on pin 16.

18 AIN_1P Analog input Analog input channel 1, positive input. Decouple with AIN_1GND on pin 19.

19 AIN_1GND Analog input Analog input channel 1, negative input. Decouple with AIN_1P on pin 18.

20 AIN2_GND Analog input Analog input channel 2, negative input. Decouple with AIN_2P on pin 21.

21 AIN_2P Analog input Analog input channel 2, positive input. Decouple with AIN_2GND on pin 20.

22 AIN_3GND Analog input Analog input channel 3, negative input. Decouple with AIN_3P on pin 23.

23 AIN_3P Analog input Analog input channel 3, positive input. Decouple with AIN_3GND on pin 22.

Analog input channel 4, negative input. Decouple with AIN_4P on pin 25.

24 NC AIN_4GND Analog input

No connection for the ADS8674; this pin can be left floating or connected to AGND.

Analog input channel 4, positive input. Decouple with AIN_4GND on pin 24.

25 NC AIN_4P Analog input

No connection for the ADS8674; this pin can be left floating or connected to AGND.

Analog input channel 5, negative input. Decouple with AIN_5P on pin 27.

26 NC AIN_5GND Analog input

No connection for the ADS8674; this pin can be left floating or connected to AGND.

Analog input channel 5, positive input. Decouple with AIN_5GND on pin 26.

27 NC AIN_5P Analog input

No connection for the ADS8674; this pin can be left floating or connected to AGND.

28 AGND Power supply Analog ground pin

29 AGND Power supply Analog ground pin

30 AVDD Power supply Analog supply pin. Decouple with AGND on pin 31.

31 AGND Power supply Analog ground pin. Decouple with AVDD on pin 30.

32 AGND Power supply Analog ground pin

33 DGND Power supply Digital ground pin. Decouple with DVDD on pin 34.

34 DVDD Power supply Digital supply pin. Decouple with DGND on pin 33.

35 ALARM Digital output Active high alarm output

36 SDO Digital output Data output for serial communication

37 SCLK Digital input Clock input for serial communication

38 CS Digital input Active low logic input; chip-select signal

Product Folder Links: ADS8674 ADS8678

ADS8674

ADS8678

www.ti.com

SBAS627 –JULY 2015

7 Specifications

7.1 Absolute Maximum Ratings

over operating free-air temperature range (unless otherwise noted)

(1)

MIN MAX UNIT

AIN_nP, AIN_nGND to GND

(2)

–20 20 V

AIN_nP, AIN_nGND to GND

(3)

–11 11 V

AUX_GND to GND –0.3 0.3 V

AUX_IN to GND –0.3 AVDD + 0.3 V

AVDD to GND or DVDD to GND –0.3 7 V

REFCAP to REFGND or REFIO to REFGND –0.3 5.7 V

GND to REFGND –0.3 0.3 V

Digital input pins to GND –0.3 DVDD + 0.3 V

Digital output pins to GND –0.3 DVDD + 0.3 V

Operating temperature, T

–40 125 °C

Storage temperature, T

stg

–65 150 °C

(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings

only, and do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended

Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

(2) AVDD = 5 V or offers a low impedance of < 30 kΩ.

(3) AVDD = floating with an impedance > 30 kΩ.

7.2 ESD Ratings

VALUE UNIT

Analog input pins

±4000

(AIN_nP; AIN_nGND)

Human body model (HBM), per ANSI/ESDA/JEDEC JS-001

(1)

Electrostatic

(ESD)

discharge All other pins ±2000

Charged device model (CDM), per JEDEC specification JESD22-C101

(2)

±500

(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.

(2) JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.

7.3 Recommended Operating Conditions

over operating free-air temperature range (unless otherwise noted)

MIN NOM MAX UNIT

AVDD Analog supply voltage 4.75 5 5.25 V

DVDD Digital supply voltage 1.65 3.3 AVDD V

7.4 Thermal Information

ADS8674,

ADS8678

THERMAL METRIC

(1)

UNIT

DBT (TSSOP)

38 PINS

θJA

Junction-to-ambient thermal resistance 68.8 °C/W

θJC(top)

Junction-to-case (top) thermal resistance 19.9 °C/W

θJB

Junction-to-board thermal resistance 30.4 °C/W

Junction-to-top characterization parameter 1.3 °C/W

Junction-to-board characterization parameter 29.8 °C/W

θJC(bot)

Junction-to-case (bottom) thermal resistance NA °C/W

(1) For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.

Product Folder Links: ADS8674 ADS8678

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