Burr Brown Corporation ADS8344NB-1K, ADS8344NB, ADS8344N-1K, ADS8344N, ADS8344EB-2K5 Datasheet
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®
1 ADS8344
ADS8344
16-Bit, 8-Channel Serial Output Sampling
ANALOG-TO-DIGITAL CONVERTER
FEATURES
● PIN FOR PIN WITH ADS7844
● SINGLE SUPPLY: 2.7V to 5V
● 8-CHANNEL SINGLE-ENDED OR
4-CHANNEL DIFFERENTIAL INPUT
● UP TO 100kHz CONVERSION RATE
● 84dB SINAD
● SERIAL INTERFACE
● QSOP-20 AND SSOP-20 PACKAGES
®
DESCRIPTION
The ADS8344 is an 8-channel, 16-bit sampling analog-to-digital converter (ADC) with a synchronous
serial interface. Typical power dissipation is 10mW at
a 100kHz throughput rate and a +5V supply. The
reference voltage (V
REF
) can be varied between 500mV
and VCC, providing a corresponding input voltage
range of 0V to V
REF
. The device includes a shutdown
mode which reduces power dissipation to under 15µW.
The ADS8344 is guaranteed down to 2.7V operation.
Low power, high speed, and on-board multiplexer
make the ADS8344 ideal for battery operated systems
such as personal digital assistants, portable multichannel data loggers, and measurement equipment.
The serial interface also provides low-cost isolation
for remote data acquisition. The ADS8344 is available
in a QSOP-20 or a SSOP-20 package and is guaranteed over the –40°C to +85°C temperature range.
©
2000 Burr-Brown Corporation PDS-1571A Printed in U.S.A. April, 2000
APPLICATIONS
● DATA ACQUISITION
● TEST AND MEASUREMENT
● INDUSTRIAL PROCESS CONTROL
● PERSONAL DIGITAL ASSISTANTS
● BATTERY-POWERED SYSTEMS
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
CDAC
SAR
Comparator
Eight
Channel
Multiplexer
Serial
Interface
and
Control
CH4
CH5
CH6
CH7
COM
V
REF
CS
SHDN
DIN
DOUT
BUSY
DCLK
CH0
CH1
CH2
CH3
¤
ADS8344
¤
ADS8344
®
2
ADS8344
SPECIFICATION: +5V
At TA = –40°C to +85°C, +VCC = +5V, V
REF
= +5V, f
SAMPLE
= 100kHz, and f
CLK
= 24 • f
SAMPLE
= 2.4MHz, unless otherwise noted.
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.
ADS8344E, N ADS8344EB, NB
PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS
ANALOG INPUT
Full-Scale Input Span Positive Input - Negative Input 0 V
REF
✻✻V
Absolute Input Range Positive Input –0.2 +V
CC
+0.2 ✻✻V
Negative Input –0.2 +1.25 ✻✻V
Capacitance 25 ✻ pF
Leakage Current ±1 ✻ µA
SYSTEM PERFORMANCE
Resolution 16 ✻ Bits
No Missing Codes 14 15 Bits
Integral Linearity Error 8 6 LSB
Offset Error ±2 ±1mV
Offset Error Match 1.2 4 ✻✻LSB
(1)
Gain Error ±0.05 ±0.024 %
Gain Error Match 1.0 4 ✻✻ LSB
Noise 20 ✻ µVrms
Power Supply Rejection +4.75V < V
CC
< 5.25V 3 ✻ LSB
(1)
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 SHDN = V
DD
2.4 ✻ MHz
External Clock Frequency 0.024 2.4 ✻✻MHz
Data Transfer Only 0 2.4 ✻✻MHz
DYNAMIC CHARACTERISTICS
Total Harmonic Distortion
(2)
VIN = 5Vp-p at 10kHz –90 ✻ dB
Signal-to-(Noise + Distortion) V
IN
= 5Vp-p at 10kHz 86 ✻ dB
Spurious Free Dynamic Range V
IN
= 5Vp-p at 10kHz 92 ✻ dB
Channel-to-Channel Isolation V
IN
= 5Vp-p at 10kHz 100 ✻ dB
REFERENCE INPUT
Range 0.5 +V
CC
✻✻V
Resistance DCLK Static 5 ✻ GΩ
Input Current 40 100 ✻✻ µA
f
SAMPLE
= 12.5kHz 2.5 ✻ µA
DCLK Static 0.001 3 ✻✻ µA
DIGITAL INPUT/OUTPUT
Logic Family CMOS ✻
Logic Levels
V
IH
| IIH | ≤ +5µA 3.0 5.5 ✻✻V
V
IL
| IIL | ≤ +5µA –0.3 +0.8 ✻✻V
V
OH
IOH = –250µA 3.5 ✻ V
V
OL
IOL = 250µA 0.4 ✻ V
Data Format Straight Binary ✻
POWER SUPPLY REQUIREMENTS
+V
CC
Specified Performance 4.75 5.25 ✻✻V
Quiescent Current 1.5 2.0 ✻ mA
f
SAMPLE
= 100kHz 300 ✻ µA
Power-Down Mode
(3)
, CS = +V
CC
3 ✻ µA
Power Dissipation 7.5 10 ✻ mW
TEMPERATURE RANGE
Specified Performance –40 +85 ✻✻°C
✻ Same specifications as ADS8344E.
NOTES: (1) LSB means Least Significant Bit. With V
REF
equal to +5.0V, one LSB is 76µV. (2) First nine harmonics of the test frequency. (3) Auto power-down mode
(PD1 = PD0 = 0) active or SHDN = GND.
®
3 ADS8344
SPECIFICATION: +2.7V
At TA = –40°C to +85°C, +VCC = +2.7V, V
REF
= +2.5V, f
SAMPLE
= 100kHz, and f
CLK
= 24 • f
SAMPLE
= 2.4MHz, unless otherwise noted.
ADS8344E, N ADS8344EB, NB
✻ Same specifications as ADS8344E.
NOTES: (1) LSB means Least Significant Bit. With V
REF
equal to +2.5V, one LSB is 38µV. (2) First nine harmonics of the test frequency. (3) Auto power-down mode
(PD1 = PD0 = 0) active or SHDN = GND.
PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS
ANALOG INPUT
Full-Scale Input Span Positive Input - Negative Input 0 V
REF
✻✻V
Absolute Input Range Positive Input –0.2 +V
CC
+0.2 ✻✻V
Negative Input –0.2 +0.2 ✻✻V
Capacitance 25 ✻ pF
Leakage Current ±1 ✻ µA
SYSTEM PERFORMANCE
Resolution 16 ✻ Bits
No Missing Codes 14 15 Bits
Integral Linearity Error 12 8 LSB
Offset Error ±1 0.5 mV
Offset Error Match 1.2 4 ✻✻ LSB
Gain Error ±0.05 ±0.0024 % of FSR
Gain Error Match 14 ✻✻ LSB
Noise 20 ✻ µVrms
Power Supply Rejection +2.7 < V
CC
< +3.3V 3 ✻ LSB
(1)
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 SHDN = V
DD
2.4 ✻ MHz
External Clock Frequency 0.024 2.0 ✻✻MHz
Data Transfer Only 0 2.0 ✻✻MHz
DYNAMIC CHARACTERISTICS
Total Harmonic Distortion
(2)
VIN = 2.5Vp-p at 1kHz –90 ✻ dB
Signal-to-(Noise + Distortion) V
IN
= 2.5Vp-p at 1kHz 86 ✻ dB
Spurious Free Dynamic Range V
IN
= 2.5Vp-p at 1kHz 92 ✻ dB
Channel-to-Channel Isolation V
IN
= 2.5Vp-p at 10kHz 100 ✻ dB
REFERENCE INPUT
Range 0.5 +V
CC
✻✻V
Resistance DCLK Static 5 ✻ GΩ
Input Current 13 40 ✻✻ µA
f
SAMPLE
= 12.5kHz 2.5 ✻ µA
DCLK Static 0.001 3 ✻✻ µA
DIGITAL INPUT/OUTPUT
Logic Family CMOS ✻
Logic Levels
V
IH
| I
IH
| ≤ +5µA+V
CC
• 0.7 5.5 ✻✻V
V
IL
| I
IL
| ≤ +5µA –0.3 +0.8 ✻✻V
V
OH
IOH = –250µA+V
CC
• 0.8 ✻ V
V
OL
IOL = 250µA 0.4 ✻ V
Data Format Straight Binary ✻
POWER SUPPLY REQUIREMENTS
+V
CC
Specified Performance 2.7 3.6 ✻✻V
Quiescent Current 1.2 1.85 ✻✻ mA
f
SAMPLE
= 100kHz 220 ✻ µA
Power-Down Mode
(3)
, CS = +V
CC
3 ✻ µA
Power Dissipation 3.2 5 ✻ mW
TEMPERATURE RANGE
Specified Performance –40 +85 ✻✻°C
®
4
ADS8344
PIN CONFIGURATION
Top View
PIN DESCRIPTIONS
PIN NAME DESCRIPTION
1 CH0 Analog Input Channel 0.
2 CH1 Analog Input Channel 1.
3 CH2 Analog Input Channel 2.
4 CH3 Analog Input Channel 3.
5 CH4 Analog Input Channel 4.
6 CH5 Analog Input Channel 5.
7 CH6 Analog Input Channel 6.
8 CH7 Analog Input Channel 7.
9 COM
Ground reference for analog inputs. Sets zero code
voltage in single ended mode. Connect this pin to ground
or ground reference point.
10 SHDN Shutdown. When LOW, the device enters a very low
power shutdown mode.
11 V
REF
Voltage Reference Input. See Specification Table for
ranges.
12 +V
CC
Power Supply, 2.7V to 5V.
13 GND Ground
14 GND Ground
15 D
OUT
Serial Data Output. Data is shifted on the falling edge of
D
CLK
. This output is high impedance when
CS is high.
16 BUSY Busy Output. Busy goes low when the DIN control bits
are being read and also when the device is converting.
The Output is high impedance when CS is High.
17 D
IN
Serial Data Input. If CS is LOW, data is latched on rising
edge of D
CLK
.
18 CS Chip Select Input. Active LOW. Data will not be clocked
into D
IN
unless CS is low. When CS is high D
OUT
is high
impedance.
19 CLK External Clock Input. The clock speed determines the
conversion rate by the equation f
CLK
= 24 • f
SAMPLE
.
20 +V
CC
Power Supply
MINIMUM
RELATIVE MAXIMUM SPECIFICATION PACKAGE
ACCURACY GAIN ERROR TEMPERATURE DRAWING ORDERING TRANSPORT
PRODUCT (LSB) (%) RANGE PACKAGE NUMBER NUMBER
(1)
MEDIA
ADS8344E 8 ±0.05 –40°C to +85°C QSOP-20 349 ADS8344E Rails
" " " " " " ADS8344E/2K5 Tape and Reel
ADS8344N " " " SSOP-20 334 ADS8344N Rails
" " " " " " ADS8344N/1K Tape and Reel
ADS8344EB 6 ±0.024 –40°C to +85°C QSOP-20 349 ADS8344EB Rails
" " " " " " ADS8344EB/2K5 Tape and Reel
ADS8344NB " " " SSOP-20 334 ADS8344NB Rails
" " " " " " ADS8344NB/1K Tape and Reel
NOTES: (1) 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 “ADS8344E/2K5” will get a single 2500-piece Tape and Reel.
PACKAGE/ORDERING INFORMATION
ABSOLUTE MAXIMUM RATINGS
(1)
+V
CC
to GND ........................................................................ –0.3V to +6V
Analog Inputs to GND ............................................ –0.3V to +V
CC
+ 0.3V
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.
ELECTROSTATIC
DISCHARGE SENSITIVITY
This integrated circuit can be damaged by ESD. Burr-Brown
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.
1
2
3
4
5
6
7
8
9
10
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7
COM
SHDN
+V
CC
D
CLK
CS
D
IN
BUSY
D
OUT
GND
GND
+V
CC
V
REF
20
19
18
17
16
15
14
13
12
11
ADS8344
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