Burr Brown Corporation ADS8321EB-2K5, ADS8321EB-250, ADS8321E-2K5, ADS8321 Datasheet
ADS8321
DESCRIPTION
The ADS8321 is a 16-bit sampling analog-to-digital
converter with guaranteed specifications over a 4.75V
to 5.25V supply range. It requires very little power
even when operating at the full 100kHz 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 ADS8321 also features a synchronous serial
(SPI/SSI compatible) interface, and a differential input. The reference voltage can be set to any level
within the range of 500mV to 2.5V.
Ultra-low power and small size make the ADS8321
ideal for portable and battery-operated systems. It is
also a perfect fit for remote data acquisition modules, simultaneous multi-channel systems, and isolated data acquisition. The ADS8321 is available in
an 8-lead MSOP package.
16-Bit, High Speed, MicroPower Sampling
ANALOG-TO-DIGITAL CONVERTER
®
©
1999 Burr-Brown Corporation PDS-1537A Printed in U.S.A. Setpember, 1999
FEATURES
● BIPOLAR INPUT RANGE
● 100kHz SAMPLING RATE
● MICRO POWER:
4.5mW at 100kHz
1mW at 10kHz
● POWER DOWN: 3µA max
● 8-LEAD MSOP PACKAGE
● PIN-COMPATIBLE TO ADS7816 AND
ADS7822
● SERIAL (SPI/SSI) INTERFACE
APPLICATIONS
● BATTERY OPERATED SYSTEMS
● REMOTE DATA ACQUISITION
● ISOLATED DATA ACQUISITION
● SIMULTANEOUS SAMPLING,
MULTI-CHANNEL SYSTEMS
● INDUSTRIAL CONTROLS
● ROBOTICS
● VIBRATION ANALYSIS
International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: (520) 746-1111
Twx: 910-952-1111 • Internet: http://www.burr-brown.com/ • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
For most current data sheet and other product
information, visit www.burr-brown.com
SAR
Serial
Interface
Comparator
ADS8321
S/H Amp
DCLOCK
D
OUT
CS/SHDN
+In
V
REF
–In
CDAC
2
®
ADS8321
SPECIFICATIONS: +VCC = +5V
At –40°C to +85°C, V
REF
= +2.5V, –In = 2.5V, f
SAMPLE
= 100kHz, and f
CLK
= 24 • f
SAMPLE
, unless otherwise specified.
The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN
assumes no responsibility for the use of this information, and all use of such information shall be entirely at the user’s own risk. Prices and specifications are subject
to change without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not
authorize or warrant any BURR-BROWN product for use in life support devices and/or systems.
ADS8321E ADS8321EB
PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS
RESOLUTION 16 ✻ Bits
ANALOG INPUT
Full-Scale Input Span +In – (–In) –V
REF
+V
REF
✻✻V
Absolute Input Range +In –0.1
V
CC
+ 0.1
✻✻V
–In –0.1 +4.0 ✻✻V
Capacitance 25 ✻ pF
Leakage Current 1 ✻ nA
SYSTEM PERFORMANCE
No Missing Codes 14 15 Bits
Integral Linearity Error ±0.008 ±0.018 ±0.006 ±0.012
% of FSR
Offset Error ±0.4 ±2 ±0.2 ±1mV
Offset Temperature Drift ±1 ✻ µV/°C
Gain Error, Positive ±0.05 ±0.024 %
Negative ±0.05 ±0.024 %
Gain Temperature Drift ±0.3 ✻ ppm/°C
Noise 60 ✻ µVrms
Common-Mode Rejection Ratio 80 ✻ dB
Power Supply Rejection Ratio +4.7V < V
CC
< 5.25V 3 ✻ LSB
(1)
SAMPLING DYNAMICS
Conversion Time 16 ✻
Clk Cycles
Acquisition Time 4.5 ✻
Clk Cycles
Throughput Rate 100 ✻ kHz
Clock Frequency Range 0.024 2.9 ✻✻MHz
DYNAMIC CHARACTERISTICS
Total Harmonic Distortion V
IN
= 5Vp-p at 10kHz –84 –86 dB
SINAD V
IN
= 5Vp-p at 10kHz 82 84 dB
Spurious Free Dynamic Range V
IN
= 5Vp-p at 10kHz 84 86 dB
SNR 85 87 dB
REFERENCE INPUT
Voltage Range 0.5 V
CC
/2 ✻✻V
Resistance
CS = GND, f
SAMPLE
= 0Hz
5 ✻ GΩ
CS = V
CC
5 ✻ GΩ
Current Drain 40 80 ✻✻µA
f
SAMPLE
= 10kHz 0.8 ✻ µA
CS = V
CC
0.1
3
✻ µA
DIGITAL INPUT/OUTPUT
Logic Family CMOS ✻
Logic Levels:
V
IH
IIH = +5µA 3.0
VCC + 0.3
✻✻V
V
IL
IIL = +5µA –0.3 0.8 ✻✻V
V
OH
IOH = –250µA 4.0 ✻ V
V
OL
IOL = 250µA 0.4 ✻ V
Data Format ✻
POWER SUPPLY REQUIREMENTS
V
CC
Specified Performance 4.75 5.25 ✻✻V
VCC Range
(2)
2.7 5.25 ✻✻V
Quiescent Current 1100 1700 ✻✻µA
f
SAMPLE
= 10kHz
(3, 4)
250 ✻ µA
Power Dissipation 5.5 8.5 ✻✻mW
Power Down CS = V
CC
0.3 3 ✻✻µA
TEMPERATURE RANGE
Specified Performance –40 +85 ✻✻°C
✻ Specifications same as grade to the left.
NOTES: (1) LSB means Least Significant Bit. (2) See Typical Performance Curves for more information. (3) f
CLK
= 2.4MHz, CS = VCC for 216 clock cycles out
of every 240. (4) See the Power Dissipation section for more information regarding lower sample rates.
Binary Two’s Complement
3
®
ADS8321
ELECTROSTATIC
DISCHARGE SENSITIVITY
Electrostatic discharge can cause damage ranging from performance degradation to complete device failure. BurrBrown Corporation recommends that all integrated circuits
be handled and stored using appropriate ESD protection
methods.
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
published specifications.
ABSOLUTE MAXIMUM RATINGS
(1)
VCC.......................................................................................................+6V
Analog Input..............................................................–0.3V to (V
CC
+ 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
1V
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.
6D
OUT
The serial output data word is comprised of 16
bits of data. In operation the data is valid on the
falling edge of DCLOCK. The second clock
pulse 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
CC
Power Supply.
PIN ASSIGNMENTS
MAXIMUM NO
INTEGRAL MISSING PACKAGE SPECIFICATION
LINEARITY CODES DRAWING TEMPERATURE ORDERING TRANSPORT
PRODUCT ERROR (LSB) ERROR (LSB) PACKAGE NUMBER
(1)
RANGE NUMBER MEDIA
ADS8321E 0.018% 14 MSOP 337 –40°C to +85°C ADS8321E/250 Tape and Reel
"" """ "ADS8321E/2K5 Tape and Reel
ADS8321EB 0.012% 15 MSOP 337 –40°C to +85°C ADS8321EB/250 Tape and Reel
"" """ "ADS8321EB/2K5 Tape and Reel
NOTES: (1) For detailed drawing and dimension table, please see end of data sheet, or Appendix C of Burr-Brown IC Data Book. (2) 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 “ADS8321EB/2K5” will get a single
2500-piece Tape and Reel. For detailed Tape and Reel mechanical information, refer to Appendix B of Burr-Brown IC Data Book.
PIN CONFIGURATION
Top View MSOP
PACKAGE/ORDERING INFORMATIONPACKAGE/ORDERING INFORMATION
1
2
3
4
8
7
6
5
+V
CC
DCLOCK
D
OUT
CS/SHDN
V
REF
+In
–In
GND
ADS8321
4
®
ADS8321
TYPICAL PERFORMANCE CURVES
At TA = +25°C, VCC = +5V, V
REF
= +2.5V, f
SAMPLE
= 100kHz, f
CLK
= 24 • f
SAMPLE
, unless otherwise specified.
INTEGRAL LINEARITY ERROR vs CODE (+25°C)
3
2
1
0
–1
–2
–3
–4
–5
–6
Integral Linearity Error (LSB)
0000
H
7FF9
H
C000
H
4000
H
FFFD
H
Hex Code
FREQUENCY SPECTRUM
(8192 Point FFT, f
IN
= 10.03kHz, –0.3dB)
0
–20
–40
–60
–80
–100
–120
–140
–160
–180
Amplitude (dB)
02010 40 5030
Frequency (kHz)
SUPPLY CURRENT vs TEMPERATURE
1400
1200
1000
800
600
400
200
0
Supply Current (µA)
–50 0 50 100
Temperature (°C)
POWER-DOWN SUPPLY CURRENT
vs TEMPERATURE
600
500
400
300
200
100
0
Supply Current (nA)
–50 –25 0 25 50 75 100
Temperature (°C)
5V
QUIESCENT CURRENT vs V
CC
1.20
1.10
1.00
0.90
0.80
0.70
0.60
Quiescent Current (mA)
2.0 2.5 3.0 3.5 4.0 4.5 5.55.0
V
CC
(V)
DIFFERENTIAL LINEARITY ERROR vs CODE (+25°C)
3.0
2.5
2.0
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
Differential Linearity Error (LSB)
0000
H
7FFC
H
C000
H
3FFF
H
FFFD
H
Hex Code
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