ADS8509
www.ti.com
SLAS324C – OCTOBER 2004 – REVISED APRIL 2010
16-BIT 250-KSPS SERIAL CMOS SAMPLING ANALOG-TO-DIGITAL CONVERTER
Check for Samples:
ADS8509
1
FEATURES
250-kHz Sampling Rate
4-V, 5-V, 10-V, ±3.33-V, ±5-V, and ±10-V Input
Ranges
±2 LSB Max INL
±1 LSB Max DNL, 16-Bit No Missing Codes
SPI Compatible Serial Output with Daisy-Chain
(TAG) Feature
Single 5-V Supply
Pin-Compatible with ADS7809 (Low Speed)
and 12-Bit ADS8508/7808
Uses Internal or External Reference
70-mW Typ Power Dissipation at 250 KSPS
20-Pin SO and 28-Pin SSOP Packages
Simple DSP Interface
DESCRIPTION
The ADS8509 is a complete 16-bit sampling
analog-to-digital (A/D) converter using state-of-the-art
CMOS structures. It contains a complete 16-bit,
capacitor-based, successive approximation register
(SAR) A/D converter with sample-and-hold,
reference, clock, and a serial data interface. Data can
be output using the internal clock or can be
synchronized to an external data clock. The ADS8509
also provides an output synchronization pulse for
ease of use with standard DSP processors.
The ADS8509 is specified at a 250-kHz sampling rate
over the full temperature range. Precision resistors
provide various input ranges including ±10 V and 0 V
to 5 V, while the innovative design allows operation
from a single +5-V supply with power dissipation
under 100 mW.
The ADS8509 is available in 20-pin SO and 28-pin
SSOP packages, both fully specified for operation
over the industrial -40°C to 85°C temperature range.
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APPLICATIONS
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Industrial Process Control
Data Acquisition Systems
Digital Signal Processing
Medical Equipment
Instrumentation
Successive Approximation Register
Clock
EXT/INT
9.8 kΩ
R1
IN
4.9 kΩ
R2
IN
2.5 kΩ
R3
IN
CAP
Buffer
4 kΩ
REF
10 kΩ
CDAC
BUSY
Serial
Data
Out
&
Control
DATACLK
DATA
R/C
SB/BTC
CS
PWRD
Comparator
Internal
+2.5 V Ref
1
2
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.
Copyright © 2004–2010, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
ADS8509
SLAS324C – OCTOBER 2004 – REVISED APRIL 2010
www.ti.com
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.
PACKAGE/ORDERING INFORMATION
(1)
PRODUCT
MINIMUM
RELATIVE
ACCURACY
(LSB)
NO
MISSING
CODE
MINIMUM
SINAD
(dB)
SPECIFICATION
TEMPERATURE
RANGE
PACKAGE
LEAD
PACKAGE
DESIGNATOR
ORDERING
NUMBER
ADS8509IBDW
ADS8509IBDWR
ADS8509IBDB
ADS8509IBDBR
ADS8509IDW
ADS8509IDWR
ADS8509IDB
ADS8509IDBR
TRANSPORT
MEDIA, QTY
Tube, 25
Tape and Reel, 2000
Tube, 50
Tape and Reel, 2000
Tube, 25
Tape and Reel, 2000
Tube, 50
Tape and Reel, 2000
SO-20
ADS8509IB
±2
16
85
–40°C to 85°C
SSOP-28
DW
DB
SO-20
ADS8509I
±3
15
83
–40°C to 85°C
SSOP-28
DW
DB
(1)
For the most current package and ordering information, see the Package Option Addendum at the end of this document, or visit the
device product folder on
www.ti.com.
ABSOLUTE MAXIMUM RATINGS
over operating free-air temperature range (unless otherwise noted)
(1)
UNIT
R1
IN
R2
IN
Analog inputs
R3
IN
REF
CAP
DGND, AGND2
Ground voltage differences
V
ANA
V
DIG
to V
ANA
V
DIG
Digital inputs
Maximum junction temperature
Storage temperature range
Internal power dissipation
Lead temperature (soldering, 1.6 mm from case 10 seconds)
(1)
All voltage values are with respect to network ground terminal.
±25 V
±25 V
±25 V
+V
ANA
+ 0.3 V to AGND2 – 0.3 V
Indefinite short to AGND2, momentary short to V
ANA
±0.3 V
6V
0.3 V
6V
–0.3 V to +V
DIG
+ 0.3 V
165°C
–65°C to 150°C
700 mW
260°C
2
Product Folder Link(s):
ADS8509
Copyright © 2004–2010, Texas Instruments Incorporated
ADS8509
www.ti.com
SLAS324C – OCTOBER 2004 – REVISED APRIL 2010
ELECTRICAL CHARACTERISTICS
At T
A
= –40°C to 85°C, f
s
= 250 kHz, V
DIG
= V
ANA
= 5 V, using internal reference and 0.1%, 0.25-W fixed resistors (see
Figure 29
and
Figure 30)
(unless otherwise specified)
PARAMETER
Resolution
ANALOG INPUT
Voltage range
(1)
Impedance
(1)
Capacitance
THROUGHPUT SPEED
Conversion cycle
Throughput rate
DC ACCURACY
INL
DNL
Integral linearity error
Differential linearity error
No missing codes
Transition noise
Full-scale
error
(4) (5)
(3)
TEST CONDITIONS
ADS8509I
MIN
TYP
MAX
16
MIN
ADS8509IB
TYP
MAX
16
UNIT
Bits
50
50
pF
Acquire and convert
250
4
250
4
ms
kHz
LSB
(2)
LSB
Bits
–3
–2
15
1
Int. ref. with 0.1% external fixed
resistors
Int. ref.
Ext. ref. with 0.1% external
fixed resistors
Ext. ref.
–10
±0.4
–5
–3
±2
1-mF Capacitor to CAP
–8
1
–0.5
–0.5
±2
–0.5
–0.5
±7
3
2
–2
–1
16
1
2
1
LSB
0.5
0.5
%FSR
ppm/°C
0.5
0.5
%FSR
ppm/°C
5
mV
ppm/°C
5
3
mV
ppm/°C
ms
8
±10-V Range
All other ranges
0.5
0.5
–0.5
–0.5
±7
Full-scale error drift
Full-scale
error
(4) (5)
±10-V Range
All other ranges
(4)
0.5
0.5
–0.5
–0.5
±2
Full-scale error drift
Bipolar zero error
10
–5
±0.4
Bipolar zero error drift
Unipolar zero
error
(4)
10-V Range
4-V and 5-V
Range
5
3
–5
–3
±2
1
Unipolar zero error drift
Recovery to rated accuracy after
power down
Power supply sensitivity
(V
DIG
= V
ANA
= V
D
)
AC ACCURACY
SFDR
THD
SINAD
Spurious-free dynamic range
Total harmonic distortion
Signal-to-(noise+distortion)
Signal-to-noise ratio
Full-power bandwidth
SAMPLING DYNAMICS
Aperture delay
Transient response
Overvoltage recovery
(8)
(7)
+4.75 V < V
D
< +5.25 V
8
–8
LSB
f
I
= 20 kHz
f
I
= 20 kHz
f
I
= 20 kHz
–60-dB Input
f
I
= 20 kHz
90
99
–98
–90
95
99
–98
–93
dB
(6)
dB
dB
dB
dB
kHz
83
88
30
85
88
32
SNR
83
88
500
86
88
500
5
FS Step
150
2
5
2
150
ns
ms
ns
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
±10 V, 0 V to 5 V, etc. (see
Table 2).
For normal operation, the analog input should not exceed configured range ±20%.
LSB means least significant bit. For the ±10-V input range, one LSB is 305
mV.
Typical rms noise at worst case transitions and temperatures.
As measured with fixed resistors shown in
Figure 29
and
Figure 30.
Adjustable to zero with external potentiometer. Factory calibrated
with 0.1%, 0.25-W resistors.
For bipolar input ranges, full-scale error is the worst case of –full-scale or +full-scale uncalibrated deviation from ideal first and last code
transitions, divided by the transition voltage (not divided by the full-scale range) and includes the effect of offset error. For unipolar input
ranges, full-scale error is the deviation of the last code transition divided by the transition voltage. It also includes the effect of offset
error.
All specifications in dB are referred to a full-scale ±10-V input.
Full-power bandwidth is defined as the full-scale input frequency at which signal-to-(noise + distortion) degrades to 60 dB.
Recovers to specified performance after 2 x FS input overvoltage.
3
Product Folder Link(s):
ADS8509
Copyright © 2004–2010, Texas Instruments Incorporated
ADS8509
SLAS324C – OCTOBER 2004 – REVISED APRIL 2010
www.ti.com
ELECTRICAL CHARACTERISTICS (continued)
At T
A
= –40°C to 85°C, f
s
= 250 kHz, V
DIG
= V
ANA
= 5 V, using internal reference and 0.1%, 0.25-W fixed resistors (see
Figure 29
and
Figure 30)
(unless otherwise specified)
PARAMETER
REFERENCE
Internal reference voltage
Internal reference source current
(must use external buffer)
Internal reference drift
External reference voltage range
for specified linearity
External reference current drain
DIGITAL INPUTS
Logic levels
V
IL
V
IH
I
IL
I
IH
Low-level input voltage
High-level input voltage
Low-level input current
High-level input current
V
IL
= 0 V
V
IH
= 5 V
–0.3
2.0
0.8
V
DIG
+0.3 V
±10
±10
–0.3
2.0
0.8
V
DIG
+0.3 V
±10
±10
V
V
mA
mA
Ext. 2.5-V ref.
2.3
No load
2.48
2.5
1
8
2.5
2.7
100
2.3
2.52
2.48
2.5
1
8
2.5
2.7
100
2.52
V
mA
ppm/°C
V
mA
TEST CONDITIONS
ADS8509I
MIN
TYP
MAX
MIN
ADS8509IB
TYP
MAX
UNIT
DIGITAL OUTPUTS
Data format (serial 16-bits)
Data coding (binary 2's
complement or straight binary)
Pipeline delay (conversion results
only available after completed
conversion)
Data clock (selectable for internal
or external data clock)
Internal clock (output only when
transmitting data)
External clock (can run
continually but not recommended
for optimum performance)
V
OL
V
OH
Low-level output voltage
High-level output voltage
Leakage current
Output capacitance
POWER SUPPLIES
V
DIG
V
ANA
I
DIG
I
ANA
Digital input voltage
Analog input voltage
Digital input current
Analog input current
Must be
≤
V
ANA
4.75
4.75
5
5
4
10
5.25
5.25
4.75
4.75
5
5
4
10
5.25
5.25
V
V
mA
mA
EXT/INT Low
EXT/INT High
0.1
9
26
0.1
9
26
MHz
I
SINK
= 1.6 mA
I
SOURCE
= 500
mA
Hi-Z State,
V
OUT
= 0 V to V
DIG
Hi-Z State
4
±5
15
0.4
4
±5
15
0.4
V
V
mA
pF
MHz
POWER DISSIPATION
PWRD Low
PWRD High
TEMPERATURE RANGE
Specified performance
Derated performance
(9)
Storage
THERMAL RESISTANCE (q
JA
)
SSOP
SO
62
46
62
46
°C/W
°C/W
–40
–55
–65
85
125
150
–40
–55
–65
85
125
150
°C
°C
°C
f
S
= 250 kHz
70
50
100
70
50
100
mW
mW
(9)
The internal reference may not be started correctly beyond the industrial temperature range (–40°C to 85°C), therefore use of an
external reference is recommended.
4
Product Folder Link(s):
ADS8509
Copyright © 2004–2010, Texas Instruments Incorporated
ADS8509
www.ti.com
SLAS324C – OCTOBER 2004 – REVISED APRIL 2010
PIN CONFIGURATIONS
DW PACKAGE
SO-20
(TOP VIEW)
R1
IN
AGND1
R2
IN
R3
IN
CAP
REF
AGND2
SB/BTC
EXT/INT
DGND
V
DIG
V
ANA
PWRD
BUSY
CS
R/C
TAG
DATA
DATACLK
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11 SYNC
DB PACKAGE
SSOP-28
(TOP VIEW)
V
DIG
V
ANA
PWRD
BUSY
CS
NC
NC
R/C
NC
R1
IN
AGND1
R2
IN
R3
IN
NC
CAP
REF
NC
AGND2
NC
NC
SB/BTC
EXT/INT
DGND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19 TAG
18
17
16
15
NC
DATA
DATACLK
SYNC
Copyright © 2004–2010, Texas Instruments Incorporated
5
Product Folder Link(s):
ADS8509
Sensor
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