ADS8343
A DS
83 4
3
SBAS183C – JANUARY 2001 – REVISED APRIL 2003
16-Bit, 4-Channel Serial Output Sampling
ANALOG-TO-DIGITAL CONVERTER
FEATURES
q
BIPOLAR INPUT RANGE
q
PIN-FOR-PIN COMPATIBLE WITH THE
ADS7841 AND ADS8341
q
SINGLE SUPPLY: 2.7V to 5V
q
4-CHANNEL SINGLE-ENDED OR
2-CHANNEL DIFFERENTIAL INPUT
q
UP TO 100kHz CONVERSION RATE
q
86dB SINAD
q
SERIAL INTERFACE
q
SSOP-16 PACKAGE
DESCRIPTION
The ADS8343 is a 4-channel, 16-bit sampling Analog-to-
Digital (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
REF
) can be
varied between 500mV and V
CC
/2, providing a corresponding
input voltage range of
±V
REF
. The device includes a shut-
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 log-
gers, 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 en-
sured over the –40°C to +85°C temperature range.
APPLICATIONS
q
q
q
q
q
DATA ACQUISITION
TEST AND MEASUREMENT
INDUSTRIAL PROCESS CONTROL
PERSONAL DIGITAL ASSISTANTS
BATTERY-POWERED SYSTEMS
SAR
DCLK
CS
CH0
CH1
CH2
CH3
COM
V
REF
Four
Channel
Multiplexer
CDAC
Comparator
Serial
Interface
and
Control
SHDN
DIN
DOUT
BUSY
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.
Copyright © 2001-2003, Texas Instruments Incorporated
www.ti.com
PACKAGE/ORDERING INFORMATION
MAXIMUM
INTEGRAL
LINEARITY
ERROR (LSB)
8
NO
MISSING
CODES
ERROR (LSB)
14
SPECIFIED
TEMPERATURE
RANGE
–40°C to +85°C
PRODUCT
ADS8343E
PACKAGE-LEAD
SSOP-16
PACKAGE
DESIGNATOR
(1)
DBQ
ORDERING
NUMBER
ADS8343E
ADS8343E/2K5
ADS8343EB
ADS8343EB/2K5
TRANSPORT
MEDIA, QUANTITY
Rails, 100
Tape and Reel, 2500
Rails, 100
Tape and Reel, 2500
"
ADS8343EB
"
6
"
15
"
SSOP-16
"
DBQ
"
–40°C to +85°C
"
"
"
"
"
"
NOTE: (1) For the most current specifications and package information, refer to our web site at www.ti.com.
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.
PIN CONFIGURATIONS
Top View
SSOP
+V
CC
CH0
CH1
1
2
3
4
5
6
7
8
ADS8343
16
15
14
13
12
11
10
9
DCLK
CS
DIN
BUSY
DOUT
GND
GND
+V
CC
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 degrada-
tion 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.
CH2
CH3
COM
SHDN
V
REF
PIN DESCRIPTIONS
PIN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
NAME
+V
CC
CH0
CH1
CH2
CH3
COM
SHDN
V
REF
+V
CC
GND
GND
DOUT
BUSY
DIN
CS
DCLK
DESCRIPTION
Power Supply, 2.7V to 5V
Analog Input Channel 0
Analog Input Channel 1
Analog Input Channel 2
Analog Input Channel 3
Common reference for analog inputs. This pin is typically connected to V
REF
.
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
Ground
Ground
Serial Data Output. Data is shifted on the falling edge of DCLK. This output is high impedance when CS is HIGH.
Busy Output. This output is high impedance when CS is HIGH.
Serial Data Input. If CS is LOW, data is latched on rising edge of DCLK.
Chip Select Input. Controls conversion timing and enables the serial input/output register.
External Clock Input. This clock runs the SAR conversion process and synchronizes serial data I/O. Maximum input clock frequency
equals 2.4MHz to achieve 100kHz sampling rate.
2
ADS8343
www.ti.com
SBAS183C
ELECTRICAL CHARACTERISTICS: +5V
At T
A
= –40°C to +85°C, +V
CC
= +5V, V
REF
= +2.5V, f
SAMPLE
= 100kHz, and f
CLK
= 24 • f
SAMPLE
= 2.4MHz, unless otherwise noted.
ADS8343E
PARAMETER
RESOLUTION
ANALOG INPUT
Full-Scale Input Span
Absolute Input Range
Capacitance
Leakage Current
SYSTEM PERFORMANCE
No Missing Codes
Integral Linearity Error
Bipolar Error
Bipolar Error Match
Gain Error
Gain Error Match
Noise
Power-Supply Rejection
SAMPLING DYNAMICS
Conversion Time
Acquisition Time
Throughput Rate
Multiplexer Settling Time
Aperture Delay
Aperture Jitter
Internal Clock Frequency
External Clock Frequency
DYNAMIC CHARACTERISTICS
Total Harmonic Distortion
(2)
Signal-to-(Noise + Distortion)
Spurious-Free Dynamic Range
Channel-to-Channel Isolation
REFERENCE INPUT
Range
Resistance
Input Current
14
±8
±2
8.0
±0.05
4.0
Positive Input-Negative Input
Positive Input
Negative Input
–V
REF
–0.2
–0.2
25
±1
15
±6
±1
✻
±0.024
✻
CONDITIONS
MIN
TYP
MAX
16
+V
REF
+V
CC
+ 0.2
+V
CC
+ 0.2
✻
✻
✻
✻
✻
MIN
ADS8343EB
TYP
MAX
✻
✻
✻
✻
UNITS
Bits
V
V
V
pF
µA
Bits
LSB
mV
LSB
(1)
%
LSB
µVrms
LSB
(1)
Clk Cycles
Clk Cycles
kHz
ns
ns
ps
MHz
MHz
MHz
dB
dB
dB
dB
✻
✻
✻
✻
✻
✻
5.5
+0.8
✻
✻
✻
✻
✻
✻
✻
✻
✻
3
10
+85
✻
✻
✻
✻
✻
✻
V
V
V
V
✻
✻
V
GΩ
µA
µA
µA
2.3
1.0
20
3
✻
✻
✻
✻
+4.75V < V
CC
< 5.25V
16
4.5
100
500
30
100
2.4
0.024
0
–95
86
97
100
0.5
DCLK Static
f
SAMPLE
= 12.5kHz
DCLK Static
5
40
2.5
0.001
CMOS
| I
IH
|
≤
+5µA
| I
IL
|
≤
+5µA
I
OH
= –250µA
I
OL
= 250µA
3.0
–0.3
3.5
+V
CC
/2
100
3
✻
2.4
2.4
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
SHDN = V
DD
Data Transfer Only
V
IN
V
IN
V
IN
V
IN
=
=
=
=
5Vp-p
5Vp-p
5Vp-p
5Vp-p
at
at
at
at
10kHz
10kHz
10kHz
50kHz
✻
✻
DIGITAL INPUT/OUTPUT
Logic Family
Logic Levels
V
IH
V
IL
V
OH
V
OL
Data Format
POWER-SUPPLY REQUIREMENTS
+V
CC
Quiescent Current
0.4
Binary Two’s Complement
4.75
1.5
150
7.5
–40
5.25
2.0
Specified Performance
f
SAMPLE
= 10kHz
Power-Down Mode
(3, 4)
, CS = +V
CC
Power Dissipation
TEMPERATURE RANGE
Specified Performance
✻
Same specifications as ADS8343E.
V
mA
µA
µA
mW
°C
NOTES: (1) LSB means Least Significant Bit. With V
REF
equal to +2.5V, one LSB is 76µV. (2) First nine harmonics of the test frequency. (3) Auto power-down mode
(PD1 = PD0 = 0) active or SHDN = GND. (4) Power-down after conversion mode with external clock gated ‘HIGH’.
ADS8343
SBAS183C
www.ti.com
3
ELECTRICAL CHARACTERISTICS: +2.7V
At T
A
= –40°C to +85°C, +V
CC
= +2.7V, V
REF
= +1.25V, f
SAMPLE
= 100kHz, and f
CLK
= 24 • f
SAMPLE
= 2.4MHz, unless otherwise noted.
ADS8343E
PARAMETER
RESOLUTION
ANALOG INPUT
Full-Scale Input Span
Absolute Input Range
Capacitance
Leakage Current
SYSTEM PERFORMANCE
No Missing Codes
Integral Linearity Error
Bipolar Error
Bipolar Error Match
Gain Error
Gain Error Match
Noise
Power-Supply Rejection
SAMPLING DYNAMICS
Conversion Time
Acquisition Time
Throughput Rate
Multiplexer Settling Time
Aperture Delay
Aperture Jitter
Internal Clock Frequency
External Clock Frequency
14
±12
±1
4.0
±0.05
4.0
Positive Input-Negative Input
Positive Input
Negative Input
–V
REF
–0.2
–0.2
25
±1
15
±8
±0.5
✻
±0.0024
✻
CONDITIONS
MIN
TYP
MAX
16
+V
REF
+V
CC
+ 0.2
+V
CC
+ 0.2
✻
✻
✻
✻
✻
MIN
ADS8343EB
TYP
MAX
✻
✻
✻
✻
UNITS
BITS
V
V
V
pF
µA
Bits
LSB
mV
LSB
% of FSR
LSB
µVrms
LSB
(1)
Clk Cycles
Clk Cycles
kHz
ns
ns
ps
MHz
MHz
MHz
MHz
1.2
1.0
20
3
✻
✻
✻
✻
+2.7 < V
CC
< +3.3V
16
4.5
100
500
30
100
2.4
0.024
0.024
0
2.4
2.0
2.4
✻
✻
✻
✻
✻
✻
✻
+V
CC
/2
5
13
2.5
0.001
CMOS
| I
IH
|
≤
+5µA
| I
IL
|
≤
+5µA
I
OH
= –250µA
I
OL
= 250µA
+V
CC
• 0.7
–0.3
+V
CC
• 0.8
5.5
+0.8
✻
✻
✻
40
3
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
✻
SHDN = V
DD
When Used with Internal Clock
Data Transfer Only
✻
✻
✻
DYNAMIC CHARACTERISTICS
Total Harmonic Distortion
(2)
Signal-to-(Noise + Distortion)
Spurious-Free Dynamic Range
Channel-to-Channel Isolation
REFERENCE INPUT
Range
Resistance
Input Current
V
IN
= 2.5Vp-p at 1kHz
V
IN
= 2.5Vp-p at 1kHz
V
IN
= 2.5Vp-p at 1kHz
V
IN
= 2.5Vp-p at 10kHz
0.5
DCLK Static
f
SAMPLE
= 12.5kHz
DCLK Static
DIGITAL INPUT/OUTPUT
Logic Family
Logic Levels
V
IH
V
IL
V
OH
V
OL
Data Format
POWER-SUPPLY REQUIREMENTS
+V
CC
Quiescent Current
–94
81
98
100
dB
dB
dB
dB
✻
✻
✻
V
GΩ
µA
µA
µA
✻
✻
✻
✻
0.4
Binary Two’s Complement
2.7
1.2
105
3.2
–40
3.6
1.85
3
5
+85
✻
✻
✻
V
V
V
V
Specified Performance
f
SAMPLE
= 10kHz
Power-Down Mode
(3, 4)
, CS = +V
CC
✻
✻
✻
✻
✻
Power Dissipation
TEMPERATURE RANGE
Specified Performance
✻
Same specifications as ADS8343E.
V
mA
µA
µA
mW
°C
NOTES: (1) LSB means Least Significant Bit. With V
REF
equal to +1.25V, one LSB is 38µV. (2) First nine harmonics of the test frequency. (3) Auto power-down mode
(PD1 = PD0 = 0) active or SHDN = GND. (4) Power-down after conversion mode with external clock gated ‘HIGH’.
4
ADS8343
www.ti.com
SBAS183C
TYPICAL CHARACTERISTICS: +5V
At T
A
= +25°C, +V
CC
= +5V, V
REF
= +2.5V, f
SAMPLE
= 100kHz, and f
CLK
= 24 • f
SAMPLE
= 2.4MHz, unless otherwise noted.
FREQUENCY SPECTRUM
(4096 Point FFT; f
IN
= 1.001kHz, –0.2dB)
0
–20
–40
0
–20
–40
FREQUENCY SPECTRUM
(4096 Point FFT; f
IN
= 9.985kHz, –0.2dB)
Amplitude (dB)
–60
–80
–100
–120
–140
0
10
20
30
40
50
Frequency (kHz)
Amplitude (dB)
–60
–80
–100
–120
–140
0
10
20
30
40
50
Frequency (kHz)
SIGNAL-TO-NOISE RATIO AND
SIGNAL-TO-(NOISE + DISTORTION)
vs INPUT FREQUENCY
100
110
SPURIOUS-FREE DYNAMIC RANGE AND
TOTAL HARMONIC DISTORTION
vs INPUT FREQUENCY
–110
SFDR
SNR and SINAD (dB)
90
SNR
100
–100
SFDR (dB)
80
SINAD
70
80
THD
(1)
–80
70
NOTE: (1) First nine harmonics of the input frequency.
1
10
Frequency (kHz)
–70
60
1
10
Frequency (kHz)
100
60
–60
100
EFFECTIVE NUMBER OF BITS
vs INPUT FREQUENCY
15.0
14.5
Effective Number of Bits
Delta from 25°C (dB)
14.0
13.5
13.0
12.5
12.0
11.5
11.0
1
10
Frequency (kHz)
100
CHANGE IN SIGNAL-TO-(NOISE + DISTORTION)
vs TEMPERATURE
0.1
f
IN
= 4.956kHz, –0.2dB
0
–0.1
–0.2
–0.3
–50
–25
0
25
Temperature (°C)
50
75
100
ADS8343
SBAS183C
www.ti.com
5
THD (dB)
90
–90
