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DESCRIPTION

The ADS8324 is a 14-bit, sampling Analog-to-Digital (A/D)

converter with tested specifications using a 1.8V supply

voltage. It requires very little power, even when operating at

the full 50kHz data rate. At lower data rates, the high speed

of the device enables it to spend most of its time in the

power-down mode—the average power dissipation is less

than 1mW at 10kHz data rate.

The ADS8324 also features a synchronous serial (SPI/SSI

compatible) interface, and a differential input. The refer-

ence voltage can be set to any level within the range of

500mV to V

/2.

Ultra-low power and small size make the ADS8324 ideal

for portable and battery-operated systems. It is also a

perfect fit for remote data acquisition modules, simulta-

neous multi-channel systems, and isolated data acquisi-

tion. The ADS8324 is available in an MSOP-8 package.

14-Bit, High Speed, 1.8V MicroPower Sampling

ANALOG-TO-DIGITAL CONVERTER

FEATURES

● BIPOLAR INPUT RANGE

● 1.8V OPERATION

● 50kHz SAMPLING RATE

● MICRO POWER:

5.0mW at 2.7V

2.5mW at 1.8V

● POWER DOWN: 3

µA max

● MSOP-8 PACKAGE

● PIN-COMPATIBLE TO 12-BIT ADS7817

● SERIAL (SPI/SSI) INTERFACE

APPLICATIONS

● BATTERY OPERATED SYSTEMS

● REMOTE DATA ACQUISITION

● ISOLATED DATA ACQUISITION

● SIMULTANEOUS SAMPLING,

MULTI-CHANNEL SYSTEMS

● INDUSTRIAL CONTROLS

● ROBOTICS

● VIBRATION ANALYSIS

SAR

Serial

Interface

Comparator

ADS8324

S/H Amp

DCLOCK

OUT

CS/SHDN

+In

REF

–In

CDAC

SBAS172A – AUGUST 2001 – REVISED MARCH 2004

ADS8324

www.ti.com

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.

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.

All trademarks are the property of their respective owners.

ADS8324

SBAS172A

www.ti.com

ABSOLUTE MAXIMUM RATINGS

(1)

....................................................................................................... +6V

Analog Input ............................................................. –0.3V to (V

+ 0.3V)

Logic Input .............................................................................. –0.3V to 6V

Case Temperature ......................................................................... +100°C

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

Storage Temperature ..................................................................... +125°C

External Reference Voltage .............................................................. +5.5V

NOTE: (1) Stresses above these ratings may permanently damage the device.

PIN NAME DESCRIPTION

REF

Reference Input

2 +In Non Inverting Input

3 –In Inverting Input

4 GND Ground

5 CS/SHDN Chip Select when LOW, Shutdown Mode when

HIGH.

OUT

The serial output data word is comprised of 16

bits of data. In operation, the data is valid on the

rising edge of DCLOCK. The fifth falling edge of

DCLOCK after the falling edge of CS enables

the serial output. After one null bit, data is valid

for the next 16 edges.

7 DCLOCK Data Clock synchronizes the serial data transfer

and determines conversion speed.

8+V

Power Supply

PIN ASSIGNMENTS

MAXIMUM NO

INTEGRAL MISSING PACKAGE SPECIFICATION

LINEARITY CODES DRAWING TEMPERATURE PACKAGE ORDERING TRANSPORT

PRODUCT ERROR (LSB) ERROR (LSB) PACKAGE NUMBER

(1)

RANGE MARKING

(2)

NUMBER

(3)

MEDIA

ADS8324E ±3 14 MSOP 337 –40°C to +85°C A24 ADS8324E/250 Tape and Reel

""""" " "ADS8324E/2K5 Tape and Reel

ADS8324EB ±2 14 MSOP 337 –40°C to +85°C A24 ADS8324EB/250 Tape and Reel

""""" " "ADS8324EB/2K5 Tape and Reel

NOTES: (1) For detail drawing and dimension table, please see end of data sheet or package drawing file on web. (2) Performance grade information is marked

on the reel. (3) Models with a slash (/) are available only in Tape and Reel in the quantities indicated (e.g., /2K5 indicates 2500 devices per reel). Ordering 2500

pieces of “ADS8324EB/2K5” will get a single 2500-piece Tape and Reel.

PIN CONFIGURATION

Top View MSOP

PACKAGE/ORDERING INFORMATIONPACKAGE/ORDERING INFORMATION

DCLOCK

OUT

CS/SHDN

REF

+In

–In

GND

ADS8324

ELECTROSTATIC

DISCHARGE SENSITIVITY

This integrated circuit can be damaged by ESD. Texas Instru-

ments 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.

ADS8324

SBAS172A

www.ti.com

ELECTRICAL CHARACTERISTICS: +V

= +1.8V

At –40°C to +85°C, V

REF

= 0.9V, –In = 0.9V, f

SAMPLE

= 50kHz, and f

CLK

= 24 • f

SAMPLE

, unless otherwise specified.

ADS8324E ADS8324EB

PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS

RESOLUTION 14 ✻ Bits

ANALOG INPUT

Full-Scale Input Span +In – (–In) –V

REF

✻✻V

Absolute Input Range +In –0.1

+ 0.1

✻✻V

–In 0.8 +1.0 ✻✻V

Capacitance 25 ✻ pF

Leakage Current 1 ✻ nA

SYSTEM PERFORMANCE

No Missing Codes 14 14 Bits

Integral Linearity Error ±3 ±2

LSB

Bipolar Zero Error ±4 ±8 ±2 ±4 LSB

Bipolar Zero Error Drift ±0.1 ✻ µV/°C

Gain Error ±4 ±8 ✻✻LSB

Gain Temperature Drift ±0.4 ✻ ppm/°C

Noise 60 ✻ µVrms

Common-Mode Rejection Ratio at D

74 ✻ dB

Power Supply Rejection Ratio +1.8V < V

< +3.6V 3 ✻ LSB

(1)

SAMPLING DYNAMICS

Conversion Time 16 ✻

Clk Cycles

Acquisition Time 4.5 ✻

Clk Cycles

Throughput Rate 50 ✻ kHz

Clock Frequency Range 0.024 1.8 ✻✻MHz

DYNAMIC CHARACTERISTICS

Total Harmonic Distortion V

= 5Vp-p at 10kHz –84 –86 dB

SINAD V

= 5Vp-p at 10kHz 77 78 dB

Spurious Free Dynamic Range V

= 5Vp-p at 10kHz 85 86 dB

SNR 78 ✻ dB

REFERENCE INPUT

Voltage Range 0.5 V

/2 ✻✻V

Resistance

CS = GND, f

SAMPLE

= 0Hz

5 ✻ GΩ

CS = V

5 ✻ GΩ

Current Drain 40 80 ✻✻µA

SAMPLE

= 10kHz 0.8 ✻ µA

CS = V

0.1

✻ µA

DIGITAL INPUT/OUTPUT

Logic Family CMOS ✻

Logic Levels:

= +5µA 1.3 V

+ 0.3 ✻✻V

= +5µA –0.3 0.5 ✻✻V

= –250µA 1.4 ✻ V

= 250µA 0.4 ✻ V

Data Format Binary Two’s Complement ✻

POWER SUPPLY REQUIREMENTS

Specified Performance 1.8 ✻ V

Range

(2)

1.8 3.6 ✻✻V

Quiescent Current 1400 1700 ✻✻µA

SAMPLE

= 10kHz

(3, 4)

250 ✻ µA

Power Dissipation V

= 1.8V 2.5 3.0 ✻✻mW

Power Down CS = V

0.3 3.0 ✻✻µA

TEMPERATURE RANGE

Specified Performance –40 +85 ✻✻°C

✻ Specifications same as ADS8324E.

NOTES: (1) LSB means Least Significant Bit. (2) See Typical Performance Curves for more information. (3) f

CLK

= 1.2MHz, CS = V

for 216 clock cycles out

of every 240. (4) See the Power Dissipation section for more information regarding lower sample rates.

ADS8324

SBAS172A

www.ti.com

TYPICAL CHARACTERISTICS

At T

= +25°C, V

= 1.8V, V

REF

= 0.9V, f

SAMPLE

= 50kHz, f

CLK

= 24 • f

SAMPLE

, unless otherwise specified.

FREQUENCY SPECTRUM

(4096 point FFT, f

= 0.989kHz, –0.2dB)

–20

–40

–60

–80

–100

–120

–140

Amplitude (dB)

0252015105

Frequency (kHz)

FREQUENCY SPECTRUM

(4096 point FFT, f

= 9.998kHz, –0.2dB)

–20

–40

–60

–80

–100

–120

–140

Amplitude (dB)

0252015105

Frequency (kHz)

FREQUENCY SPECTRUM

(4096 point FFT, f

= 20.001kHz, –0.2dB)

–20

–40

–60

–80

–100

–120

–140

Amplitude (dB)

0252015105

Frequency (kHz)

SIGNAL-TO-NOISE RATIO AND

SIGNAL-TO-(NOISE + DISTORTION)

vs INPUT FREQUENCY

SNR and SINAD (dB)

1 10010

SNR

SINAD

Frequency (kHz)

SIGNAL-TO-NOISE RATIO AND

TOTAL HARMONIC DISTORTION

vs INPUT FREQUENCY

100

SFDR (dB)

–100

–95

–90

–85

–80

–75

–70

–65

–60

THD (dB)

1 10010

Frequency (kHz)

SFDR

THD

(1)

NOTE: (1) First nine harmonics

of the input frequency.

COMMON-MODE REJECTION vs FREQUENCY

CMRR (dB)

100 1M10k 100k1k

Frequency (kHz)

= 400mVp-p sinewave centered around V

REF

ADS8324

SBAS172A

www.ti.com

TYPICAL CHARACTERISTICS (Cont.)

At T

= +25°C, V

= 1.8V, V

REF

= 0.9V, f

SAMPLE

= 50kHz, f

CLK

= 24 • f

SAMPLE

, unless otherwise specified.

DIFFERENTIAL LINEARITY ERROR vs CODE

–1

DLE (LSBs)

2000

1FFF

0000

1000

3000

Output Code

INTEGRAL LINEARITY ERROR vs CODE

–1

–2

ILE (LSBs)

2000

1FFF

0000

1000

3000

Output Code

QUIESCENT CURRENT vs V

2.5

1.5

0.5

Quiescent Current (mA)

1.5 43 3.52 2.5

(V)

REFERENCE CURRENT vs TEMPERATURE

Average Reference Current (µA)

–50 9030 50 70–30 –10 10

Temperature (°C)

SUPPLY CURRENT vs TEMPERATURE

1.8

1.6

1.4

1.2

0.8

0.6

0.4

0.2

Supply Current (µA)

–50 9030 50 70–30 –10 10

Temperature (°C)

REFERENCE CURRENT vs SAMPLE RATE

Reference Current (µA)

08040 6020

Sample Rate (kHz)

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