TEXAS INSTRUMENTS ADS8343 Technical data

ADS8343

AD

S8

343

SBAS183C – JANUARY 2001 – REVISED APRIL 2003

16-Bit, 4-Channel Serial Output Sampling

ANALOG-TO-DIGITAL CONVERTER

FEATURES

● BIPOLAR INPUT RANGE

● PIN-FOR-PIN COMPATIBLE WITH THE

ADS7841 AND ADS8341

● SINGLE SUPPLY: 2.7V to 5V

● 4-CHANNEL SINGLE-ENDED OR

2-CHANNEL DIFFERENTIAL INPUT

● UP TO 100kHz CONVERSION RATE

● 86dB SINAD

● SERIAL INTERFACE

● SSOP-16 PACKAGE

APPLICATIONS

● DATA ACQUISITION

● TEST AND MEASUREMENT

● INDUSTRIAL PROCESS CONTROL

● PERSONAL DIGITAL ASSISTANTS

● BATTERY-POWERED SYSTEMS

DESCRIPTION

The ADS8343 is a 4-channel, 16-bit sampling Analog-to­Digital (A/D) converter with a synchronous serial interface.
Typical power dissipation is 8mW at a 100kHz throughput
rate and a +5V supply. The reference voltage (V
varied between 500mV and V
input voltage range of ±V

/2, providing a corresponding

CC

. The device includes a shut-

REF

down mode which reduces power dissipation to under 15µW.
The ADS8343 is ensured down to 2.7V operation.

Low power, high speed, and an onboard multiplexer make
the ADS8343 ideal for battery-operated systems such as
personal digital assistants, portable multi-channel data log­gers, and measurement equipment. The serial interface also
provides low-cost isolation for remote data acquisition. The
ADS8343 is available in an SSOP-16 package and is en­sured over the –40°C to +85°C temperature range.

REF

) can be

CH0
CH1
CH2
CH3

COM

V

REF

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.

Four

Channel

Multiplexer

CDAC

SAR

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Comparator

DCLK

CS

Serial

Interface

and

Control

Copyright © 2001-2003, Texas Instruments Incorporated

SHDN
DIN
DOUT
BUSY

PACKAGE/ORDERING INFORMATION

MAXIMUM NO

INTEGRAL MISSING SPECIFIED

PRODUCT ERROR (LSB) ERROR (LSB) PACKAGE-LEAD DESIGNATOR

LINEARITY CODES PACKAGE TEMPERATURE ORDERING TRANSPORT

ADS8343E 8 14 SSOP-16 DBQ –40°C to +85°C ADS8343E Rails, 100

(1)

RANGE NUMBER MEDIA, QUANTITY

""""""ADS8343E/2K5 Tape and Reel, 2500

ADS8343EB 6 15 SSOP-16 DBQ –40°C to +85°C ADS8343EB Rails, 100

""""""ADS8343EB/2K5 Tape and Reel, 2500

NOTE: (1) For the most current specifications and package information, refer to our web site at www.ti.com.

ABSOLUTE MAXIMUM RATINGS

+V

to GND ........................................................................ –0.3V to +6V

CC

Analog Inputs to GND ............................................ –0.3V to +V

Digital Inputs to GND ........................................................... –0.3V to +6V

Power Dissipation .......................................................................... 250mW

Maximum Junction Temperature................................................... +150°C

Operating Temperature Range ........................................ –40°C to +85°C

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

Lead Temperature (soldering, 10s) ............................................... +300°C

NOTE: (1) Stresses above those listed under “Absolute Maximum Ratings”
may cause permanent damage to the device. Exposure to absolute maximum
conditions for extended periods may affect device reliability.

(1)

+ 0.3V

CC

ELECTROSTATIC
DISCHARGE SENSITIVITY

This integrated circuit can be damaged by ESD. Texas Instru­ments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling
and installation procedures can cause damage.

ESD damage can range from subtle performance degrada­tion to complete device failure. Precision integrated circuits
may be more susceptible to damage because very small
parametric changes could cause the device not to meet its
published specifications.

PIN CONFIGURATIONS

Top View SSOP

+V

CH0
CH1
CH2
CH3

COM

SHDN

V

REF

1

CC

2
3
4
5
6
7
8

ADS8343

DCLK

16

CS

15

DIN

14

BUSY

13

DOUT

12

GND

11

GND

10

+V

9

CC

PIN DESCRIPTIONS

PIN NAME DESCRIPTION

1+V
2 CH0 Analog Input Channel 0
3 CH1 Analog Input Channel 1
4 CH2 Analog Input Channel 2
5 CH3 Analog Input Channel 3
6 COM Common reference for analog inputs. This pin is typically connected to V
7
8V

9+V
10 GND Ground
11 GND Ground
12 DOUT Serial Data Output. Data is shifted on the falling edge of DCLK. This output is high impedance when
13 BUSY Busy Output. This output is high impedance when
14 DIN Serial Data Input. If CS is LOW, data is latched on rising edge of DCLK.
15
16 DCLK External Clock Input. This clock runs the SAR conversion process and synchronizes serial data I/O. Maximum input clock frequency

CC

SHDN

REF

CC

CS

Power Supply, 2.7V to 5V

.
Shutdown. When LOW, the device enters a very low power shutdown mode.
Voltage Reference Input. See Electrical Characteristic Table for ranges.
Power Supply, 2.7V to 5V

is HIGH.

CS

Chip Select Input. Controls conversion timing and enables the serial input/output register.

equals 2.4MHz to achieve 100kHz sampling rate.

REF

CS

is HIGH.

2

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ADS8343

SBAS183C

ELECTRICAL CHARACTERISTICS: +5V

At TA = –40°C to +85°C, +VCC = +5V, V

PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS
RESOLUTION 16 ✻ Bits

ANALOG INPUT

Full-Scale Input Span Positive Input-Negative Input –V
Absolute Input Range Positive Input –0.2 +V

Capacitance 25 ✻ pF
Leakage Current ±1 ✻ µA

SYSTEM PERFORMANCE

No Missing Codes 14 15 Bits
Integral Linearity Error ±8 ±6LSB
Bipolar Error ±2 ±1mV
Bipolar Error Match 2.3 8.0 ✻✻LSB
Gain Error ±0.05 ±0.024 %
Gain Error Match 1.0 4.0 ✻✻ LSB
Noise 20 ✻ µVrms
Power-Supply Rejection +4.75V < V

SAMPLING DYNAMICS

Conversion Time 16 ✻ Clk Cycles
Acquisition Time 4.5 ✻ Clk Cycles
Throughput Rate 100 ✻ kHz
Multiplexer Settling Time 500 ✻ ns
Aperture Delay 30 ✻ ns
Aperture Jitter 100 ✻ ps
Internal Clock Frequency
External Clock Frequency 0.024 2.4 ✻✻MHz

DYNAMIC CHARACTERISTICS

Total Harmonic Distortion

(2)

Signal-to-(Noise + Distortion) V
Spurious-Free Dynamic Range V
Channel-to-Channel Isolation V

REFERENCE INPUT

Range 0.5 +VCC/2 ✻✻V
Resistance DCLK Static 5 ✻ GΩ
Input Current 40 100 ✻✻ µA

DIGITAL INPUT/OUTPUT

Logic Family CMOS ✻
Logic Levels

V

IH

V

IL

V

OH

V

OL

Data Format Binary Two’s Complement ✻

POWER-SUPPLY REQUIREMENTS

+V

CC

Quiescent Current 1.5 2.0 ✻ mA

Power Dissipation 7.5 10 ✻ mW

TEMPERATURE RANGE

Specified Performance –40 +85 ✻✻°C

= +2.5V, f

REF

= 100kHz, and f

SAMPLE

CLK

= 24 • f

= 2.4MHz, unless otherwise noted.

SAMPLE

ADS8343E ADS8343EB

REF

Negative Input –0.2 +V

< 5.25V 3 ✻ LSB

CC

SHDN

= V

DD

2.4 ✻ MHz

+V

REF

+ 0.2 ✻✻V

CC

+ 0.2 ✻✻V

CC

✻✻V

Data Transfer Only 0 2.4 ✻✻MHz

VIN = 5Vp-p at 10kHz –95 ✻ dB

= 5Vp-p at 10kHz 86 ✻ dB

IN

= 5Vp-p at 10kHz 97 ✻ dB

IN

= 5Vp-p at 50kHz 100 ✻ dB

IN

f

= 12.5kHz 2.5 ✻ µA

SAMPLE

DCLK Static 0.001 3 ✻✻ µA

| IIH | ≤ +5µA 3.0 5.5 ✻✻V
| IIL | ≤ +5µA –0.3 +0.8 ✻✻V

IOH = –250µA 3.5 ✻ V

IOL = 250µA 0.4 ✻ V

Specified Performance 4.75 5.25 ✻✻V

f

= 10kHz 150 ✻ µA

SAMPLE

Power-Down Mode

(3, 4)

, CS = +V

CC

3 ✻ µA

(1)

(1)

✻ Same specifications as ADS8343E.
NOTES: (1) LSB means Least Significant Bit. With V

(PD1 = PD0 = 0) active or

= GND. (4) Power-down after conversion mode with external clock gated ‘HIGH’.

SHDN

ADS8343

SBAS183C

equal to +2.5V, one LSB is 76µV. (2) First nine harmonics of the test frequency. (3) Auto power-down mode

REF

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3

ELECTRICAL CHARACTERISTICS: +2.7V

At TA = –40°C to +85°C, +VCC = +2.7V, V

PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS
RESOLUTION 16 ✻ BITS

ANALOG INPUT

Full-Scale Input Span Positive Input-Negative Input –V
Absolute Input Range Positive Input –0.2 +V

Capacitance 25 ✻ pF
Leakage Current ±1 ✻ µA

SYSTEM PERFORMANCE

No Missing Codes 14 15 Bits
Integral Linearity Error ±12 ±8LSB
Bipolar Error ±1 ±0.5 mV
Bipolar Error Match 1.2 4.0 ✻✻ LSB
Gain Error ±0.05 ±0.0024 % of FSR
Gain Error Match 1.0 4.0 ✻✻ LSB
Noise 20 ✻ µVrms
Power-Supply Rejection +2.7 < V

SAMPLING DYNAMICS

Conversion Time 16 ✻ Clk Cycles
Acquisition Time 4.5 ✻ Clk Cycles
Throughput Rate 100 ✻ kHz
Multiplexer Settling Time 500 ✻ ns
Aperture Delay 30 ✻ ns
Aperture Jitter 100 ✻ ps
Internal Clock Frequency
External Clock Frequency 0.024 2.4 ✻✻MHz

DYNAMIC CHARACTERISTICS

Total Harmonic Distortion

(2)

Signal-to-(Noise + Distortion) V
Spurious-Free Dynamic Range V
Channel-to-Channel Isolation V

REFERENCE INPUT

Range 0.5 +VCC/2 ✻✻V
Resistance DCLK Static 5 ✻ GΩ
Input Current 13 40 ✻✻ µA

DIGITAL INPUT/OUTPUT

Logic Family CMOS ✻
Logic Levels

V

IH

V

IL

V

OH

V

OL

Data Format Binary Two’s Complement ✻

POWER-SUPPLY REQUIREMENTS

+V

CC

Quiescent Current 1.2 1.85 ✻✻ mA

Power Dissipation 3.2 5 ✻ mW

TEMPERATURE RANGE

Specified Performance –40 +85 ✻✻°C

✻ Same specifications as ADS8343E.

NOTES: (1) LSB means Least Significant Bit. With V
(PD1 = PD0 = 0) active or

= GND. (4) Power-down after conversion mode with external clock gated ‘HIGH’.

SHDN

= +1.25V, f

REF

= 100kHz, and f

SAMPLE

CLK

= 24 • f

= 2.4MHz, unless otherwise noted.

SAMPLE

ADS8343E ADS8343EB

REF

Negative Input –0.2 +V

< +3.3V 3 ✻ LSB

CC

SHDN

= V

DD

2.4 ✻ MHz

+V

REF

+ 0.2 ✻✻V

CC

+ 0.2 ✻✻V

CC

✻✻V

When Used with Internal Clock 0.024 2.0 ✻✻MHz

Data Transfer Only 0 2.4 ✻✻MHz

VIN = 2.5Vp-p at 1kHz –94 ✻ dB

= 2.5Vp-p at 1kHz 81 ✻ dB

IN

= 2.5Vp-p at 1kHz 98 ✻ dB

IN

= 2.5Vp-p at 10kHz 100 ✻ dB

IN

f

= 12.5kHz 2.5 ✻ µA

SAMPLE

DCLK Static 0.001 3 ✻✻ µA

| I

| ≤ +5µA+V

IH

| I

| ≤ +5µA –0.3 +0.8 ✻✻V

IL

IOH = –250µA+V

IOL = 250µA 0.4 ✻ V

• 0.7 5.5 ✻✻V

CC

• 0.8 ✻ V

CC

Specified Performance 2.7 3.6 ✻✻V

f

= 10kHz 105 µA

SAMPLE

Power-Down Mode

(3, 4)

, CS = +V

equal to +1.25V, one LSB is 38µV. (2) First nine harmonics of the test frequency. (3) Auto power-down mode

REF

CC

3 ✻ µA

(1)

4

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ADS8343

SBAS183C

TYPICAL CHARACTERISTICS: +5V

0

–20

–40

–60

–80

–100

–120

–140

FREQUENCY SPECTRUM

(4096 Point FFT; f

IN

= 9.985kHz, –0.2dB)

0502010 4030

Frequency (kHz)

Amplitude (dB)

SPURIOUS-FREE DYNAMIC RANGE AND

TOTAL HARMONIC DISTORTION

vs INPUT FREQUENCY

101 100

Frequency (kHz)

SFDR (dB)

110

100

90

80

70

60

THD (dB)

–110

–100

–90

–80

–70

–60

SFDR

THD

(1)

NOTE: (1) First nine harmonics of the input frequency.

Temperature (°C)

0.1

0

–0.1

–0.2

–0.3

CHANGE IN SIGNAL-TO-(NOISE + DISTORTION)

vs TEMPERATURE

25 100–50 –25 0 50 75

Delta from 25°C (dB)

fIN = 4.956kHz, –0.2dB

At TA = +25°C, +VCC = +5V, V

0

–20

–40

–60

–80

Amplitude (dB)

–100

–120

–140

100

(4096 Point FFT; f

0502010 4030

SIGNAL-TO-(NOISE + DISTORTION)

= +2.5V, f

REF

FREQUENCY SPECTRUM

SIGNAL-TO-NOISE RATIO AND

vs INPUT FREQUENCY

= 1.001kHz, –0.2dB)

IN

Frequency (kHz)

= 100kHz, and f

SAMPLE

CLK

= 24 • f

SAMPLE

= 2.4MHz, unless otherwise noted.

90

80

70

SNR and SINAD (dB)

60

15.0

14.5

14.0

13.5

13.0

12.5

12.0

Effective Number of Bits

11.5

11.0

ADS8343

SBAS183C

SNR

101 100

Frequency (kHz)

EFFECTIVE NUMBER OF BITS

vs INPUT FREQUENCY

101 100

Frequency (kHz)

SINAD

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5

TYPICAL CHARACTERISTICS: +5V (Cont.)

At TA = +25°C, +VCC = +5V, V

= +2.5V, f

REF

= 100kHz, and f

SAMPLE

CLK

= 24 • f

= 2.4MHz, unless otherwise noted.

SAMPLE

3

2

1

0

ILE (LSBs)

–1

–2

–3

–4

8000

1.6

1.5

1.4

INTEGRAL LINEARITY ERROR vs CODE

C000

H

H

0000

H

Output Code

SUPPLY CURRENT vs TEMPERATURE

4000

DIFFERENTIAL LINEARITY ERROR vs CODE

4

3

2

1

0

DLE (LSBs)

–1

–2

–3

7FFF

H

H

8000

C000

H

H

0000

H

4000

H

7FFF

H

Output Code

CHANGE IN BPZ vs TEMPERATURE

1

0

–1

–2

1.3

Supply Current (mA)

1.2
–50 –25 0 25 50 75 100

Temperature (°C)

CHANGE IN GAIN vs TEMPERATURE

1.0

0.5

0

Delta from 25°C (LSBs)

–0.5

–50 –25 0 25 50 75 100

Temperature (°C)

Delta from 25°C (LSBs)

–3

–4

–50 –25 0 25 50 75 100

Temperature (°C)

WORST-CASE CHANNEL-TO-CHANNEL

BPZ MATCH vs TEMPERATURE

4.5

4.0

3.5

BPZ Match (LSBs)

3.0
–50 –25 0 25 50 75 100

Temperature (°C)

6

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ADS8343

SBAS183C