DATASHEET
ISL26712, ISL26710, ISL26708
12-Bit, 10-Bit and 8-Bit, 1MSPS SAR ADCs
The ISL26712, ISL26710, ISL26708 are 12-bit, 10-bit and 8-bit,
1MSPS sampling SAR-type ADCs featuring excellent linearity
over supply and temperature variations. The robust,
fully-differential input offers high impedance to minimize errors
due to leakage currents, and the specified measurement
accuracy is maintained with input signals up to the supply rails.
The reference accepts inputs from 0.1V to 2.2V for 3V
operation and 0.1V to 3.5V for 5V operation, providing design
flexibility in a wide variety of applications. The
ISL26712/10/08 also features up to 8kV Human Body Model
ESD survivability.
The serial digital interface is SPI compatible and is easily
interfaced to popular FPGAs and microcontrollers. Power
dissipation is 8.5mW at a sampling rate of 1MSPS, and just
5µW between conversions utilizing Auto Power-Down mode
(with a 5V supply), making the ISL26712/10/08 excellent
solutions for remote industrial sensors and battery-powered
instruments.
The ISL26712/10/08 are available in an 8 Ld TDFN or an SOT-
23 package, and are specified for operation over the Industrial
temperature range (–40°C to +85°C).
FN7999
Rev 3.00
September 5, 2012
Features
• Differential Input
• Simple SPI-compatible Serial Digital Interface
• Guaranteed No Missing Codes
• 1MHz Sampling Rate
• 3V or 5V Operation
• Low Operating Current
- 1.25mA at 1MSPS with 3V Supplies
- 1.70mA at 1MSPS with 5V Supplies
• Power-down Current between Conversions: 1µA
• Excellent Differential Non-Linearity
• Low THD: -83dB (typ)
• Pb-Free (RoHS Compliant)
• Available in TDFN Package (3x3mm)
• Available in SOT-23 Package
Applications
• Remote Data Acquisition
• Battery Operated Systems
• Industrial Process Control
• Energy Measurement
• Data Acquisition Systems
• Pressure Sensors
• Flow Controllers
1.0
0.8
VREF
DAC
VDD
0.6
0.4
DNL (LSB)
0.2
0.0
-0.2
-0.4
AIN+
AIN–
DAC
SAR
LOGIC
SERIAL
INTERFACE
SCLK
SDATA
CS
VREF
-0.6
GND
-0.8
-1.0
0
1024
2048
CODE
3072
4096
FIGURE 1. BLOCK DIAGRAM
FIGURE 2. ISL26712 DIFFERENTIAL LINEARITY ERROR vs CODE
FN7999 Rev 3.00
September 5, 2012
Page 1 of 21
ISL26712, ISL26710, ISL26708
Typical Connection Diagram
VREF
+
0.1µF
+
10µF
+3V/5V
SUPPLY
VREF
VDD
REF
P-P
AIN+
SCLK
REF
P-P
AIN–
SDATA
µP/µC
GND
CS
SERIAL INTERFACE
Pin Configurations
ISL26712/10/08
(8 LD TDFN)
TOP VIEW
VREF
1
8
7
6
5
V
DD
SCLK
SDATA
CS
Pin Description
ISL26712/10/08
PIN
NAME
VDD
SCLK
PIN
NUMBER
(TDFN)
8
7
PIN
NUMBER
(SOT-23)
1
2
DESCRIPTION
Supply voltage, +2.7V to 5.25V.
Serial clock input. Controls digital
I/O timing and clocks the
conversion.
Digital conversion output.
Chip select input. Generally controls
the start of a conversion though not
always the sampling signal.
Ground
Negative analog input.
Positive analog input.
Reference voltage.
AIN+ 2
AIN- 3
GND
4
SDATA
6
5
3
4
ISL26712/10/08
(8 LD SOT-23)
TOP VIEW
V
DD
SCLK
SDATA
CS
1
2
3
4
8
7
6
5
VREF
AIN+
AIN-
GND
CS
GND
AIN–
AIN+
VREF
4
3
2
1
5
6
7
8
Pin-Compatible Family
PART NUMBER
ISL26712
ISL26710
ISL26708
RESOLUTION
(Bits)
12
10
8
FN7999 Rev 3.00
September 5, 2012
Page 2 of 21
ISL26712, ISL26710, ISL26708
Ordering Information
PART NUMBER
(Note 4)
ISL26712IRTZ (Note 3)
ISL26712IRTZ-T (Notes 1, 3)
ISL26712IRTZ-T7A (Notes 1, 3)
ISL26710IRTZ (Note 3)
ISL26710IRTZ-T (Notes 1, 3)
ISL26710IRTZ-T7A (Notes 1, 3)
ISL26708IRTZ (Note 3)
ISL26708IRTZ-T (Notes 1, 3)
ISL26712IHZ-T (Notes 1, 2)
ISL26712IHZ-T7A (Notes 1, 2)
ISL26710IHZ-T (Notes 1, 2)
ISL26710IHZ-T7A (Notes 1, 2)
ISL26708IHZ-T (Notes 1, 2)
ISL26708IHZ-T7A (Notes 1, 2)
NOTES:
1. Please refer to
TB347
for details on reel specifications.
2. These Intersil Pb-free plastic packaged products employ special Pb-free material sets; molding compounds/die attach materials and NiPdAu plate -
e4 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are MSL
classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.
3. These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100% matte
tin plate plus anneal (e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations). Intersil Pb-
free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.
4. For Moisture Sensitivity Level (MSL), please see device information page fo
ISL26712, ISL26710, ISL26708.
For more information on MSL please see
techbrief
TB363.
5. The part marking is located on the bottom of the part.
PART
MARKING
6712
6712
6712
6710
6710
6710
6708
6708
6712 (Note 5)
6712 (Note 5)
6710 (Note 5)
6710 (Note 5)
6708 (Note 5)
6708 (Note 5)
VDD RANGE
(V)
2.7 to 5.25
2.7 to 5.25
2.7 to 5.25
2.7 to 5.25
2.7 to 5.25
2.7 to 5.25
2.7 to 5.25
2.7 to 5.25
2.7 to 5.25
2.7 to 5.25
2.7 to 5.25
2.7 to 5.25
2.7 to 5.25
2.7 to 5.25
TEMP RANGE
(°C)
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
PACKAGE
(Pb-free)
8 Ld TDFN
8 Ld TDFN
8 Ld TDFN
8 Ld TDFN
8 Ld TDFN
8 Ld TDFN
8 Ld TDFN
8 Ld TDFN
8 Ld SOT-23
8 Ld SOT-23
8 Ld SOT-23
8 Ld SOT-23
8 Ld SOT-23
8 Ld SOT-23
PKG.
DWG. #
L8.3x3I
L8.3x3I
L8.3x3I
L8.3x3I
L8.3x3I
L8.3x3I
L8.3x3I
L8.3x3I
P8.064
P8.064
P8.064
P8.064
P8.064
P8.064
FN7999 Rev 3.00
September 5, 2012
Page 3 of 21
ISL26712, ISL26710, ISL26708
Table of Contents
Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Thermal Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Timing Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Typical Performance Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
ADC Transfer Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Analog Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltage Reference Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Converter Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Short Cycling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power-on Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ACQUISITION TIME . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power vs Throughput Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Serial Digital Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Signal-to-(Noise + Distortion) Ratio (SINAD). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Total Harmonic Distortion. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Peak Harmonic or Spurious Noise (SFDR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Intermodulation Distortion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Aperture Delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Aperture Jitter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Full Power Bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Common-Mode Rejection Ratio (CMRR). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Integral Nonlinearity (INL). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Differential Nonlinearity (DNL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Zero-Code Error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Positive Gain Error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Negative Gain Error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Track and Hold Acquisition Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Supply Rejection Ratio (PSRR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
13
13
14
15
17
17
17
17
17
17
17
17
17
18
18
18
18
18
18
18
18
18
18
18
18
Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Application Hints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Grounding and Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Revision History. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Products . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Small Outline Transistor Plastic Packages (SOT23-8) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
P8.064 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Package Outline Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
L8.3x3I . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
FN7999 Rev 3.00
September 5, 2012
Page 4 of 21
ISL26712, ISL26710, ISL26708
Absolute Maximum Ratings
Any Pin to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +6.0V
Analog Input to GND. . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to V
DD
+ 0.3V
Digital I/O to GND. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to V
DD
+ 0.3V
Digital Input Voltage to GND . . . . . . . . . . . . . . . . . . . . . . -0.3V to V
DD
+ 0.3V
Maximum Current In to Any Pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10mA
ESD Rating
Human Body Model (Tested per JESD22-A114F) . . . . . . . . . . . . . . . . 8kV
Machine Model (Tested per JESD22-A115B) . . . . . . . . . . . . . . . . . 400V
Charged Device Model (Tested per JESD22-C101E)
TDFN Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.0kV
SOT-23 Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.5kV
Latch Up (Tested per JESD78C; Class 2, Level A) . . . . . . . . . . . . . . . 100mA
Thermal Information
Thermal Resistance (Typical)
JA
(°C/W)
JC
(°C/W)
8 Ld TDFN Package (Notes 6, 8) . . . . . . . . .
41
6
8 Ld SOT-23 Package (Notes 7, 9). . . . . . . .
135
99
Operating Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40°C to +85°C
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C
Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+150°C
Pb-Free Reflow Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see link below
http://www.intersil.com/pbfree/Pb-FreeReflow.asp
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product
reliability and result in failures not covered by warranty.
NOTES:
6.
JA
is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. See Tech
Brief
TB379.
7.
JA
is measured with the component mounted on a high effective thermal conductivity test board in free air. See Tech Brief
TB379
for details.
8. For
JC
, the “case temp” location is the center of the exposed metal pad on the package underside.
9. For
JC
, the “case temp” location is taken at the package top center.
V
DD
= +3.0V to +3.6V, F
SCLK
= 18MHz, F
S
= 1MSPS, V
REF
= 2.0V; V
DD
= +4.75V to +5.25V, F
SCLK
= 18MHz,
F
S
= 1MSPS, V
REF
= 2.5V; V
CM
= V
REF
, unless otherwise noted. Typical values are at T
A
= +25°C. Boldface limits apply over the operating temperature
range, -40°C to +85°C.
ISL26712
SYMBOL
PARAMETER
TEST CONDITIONS
MIN
(Note 10)
TYP
MAX
MIN
(Note 10) (Note 10)
ISL26710
TYP
MAX
MIN
(Note 10) (Note 10)
ISL26708
TYP
MAX
(Note 10) UNITS
Electrical Specifications
DYNAMIC PERFORMANCE
SINAD Signal-to (Noise +
Distortion) Ratio
F
IN
= 100kHz
V
DD
= +4.75V to +5.25V
F
IN
= 100kHz
V
DD
= +3.0V to +3.6V
THD
Total Harmonic
Distortion
F
IN
= 100kHz
V
DD
= +4.75V to +5.25V
F
IN
= 100kHz
V
DD
= +3.0V to +3.6V
SFDR Spurious Free Dynamic F
IN
= 100kHz
V
DD
= +4.75V to +5.25V
Range
F
IN
= 100kHz
V
DD
= +3.0V to +3.6V
IMD
tpd
tpd
Intermodulation
Distortion
Aperture Delay
Aperture Jitter
@ –3dB
2nd and 3rd order,
F
IN
= 90kHz, 110kHz
70.0
68.5
71.4
70.5
-84
-84
-87
-85
-89
1
15
15
-76
-74
-76
-74
61.0
60.7
61.6
61.5
-82
-82
-82
-82
-83
1
15
15
-74
-72
-76
-74
49.0
49.0
49.8
49.8
-75
-73
-68
-68
-81
1
15
15
-60
-60
-60
-60
dB
dB
dB
dB
dB
dB
dB
ns
ps
MHz
3dB
Full Power Bandwidth
DC ACCURACY
N
INL
DNL
Resolution
Integral Nonlinearity
Differential Nonlinearity Guaranteed no missing
codes
Zero Volt Differential Input
12
-1
-0.95
-6
±0.4
±0.3
±0.2
1
0.95
6
10
-0.5
-0.5
-2.5
±0.1
±0.1
±0.2
0.5
0.5
2.5
8
-0.2
-0.2
-1.25
±0.03
±0.03
±0.03
0.2
0.2
1.25
Bits
LSB
LSB
LSB
OFFSET Zero-Code Error
FN7999 Rev 3.00
September 5, 2012
Page 5 of 21
