DATASHEET
ISL26320, ISL26321, ISL26322, ISL26323, ISL26324, ISL26325, ISL26329
12-Bit, 250kSPS Low-Power ADCs with Single-Ended and Differential Inputs and Multiple Input
Channels
The ISL26320, ISL26321, ISL26322, ISL26323, ISL26324,
ISL26325 and ISL26329 family of sampling SAR-type ADCs
feature excellent linearity over supply and temperature
variations, and offer versions with 1-, 2-, 4- and 8-channel
single-ended inputs, and 1-, 2- and 4-channel differential
inputs. A proprietary input multiplexer and combination buffer
amplifier reduces the input drive requirements, resulting in
lower cost and reduced board space. Specified measurement
accuracy is maintained with input signals up to V
DD
.
Members of the The ISL26320, ISL26321, ISL26322,
ISL26323, ISL26324, ISL26325 and ISL26329 family of
Low-Power ADCs offer pinout intercompatibility, differing only
in the analog inputs, to support quick replication of proven
layouts across multiple design platforms.
The serial digital interface is SPI compatible and is easily
interfaced to popular FPGAs and microcontrollers. Power
consumption is limited to 15mW at a sampling rate of
250kSPS, and an operating current of just 8µA typical
between conversions, when configured for Auto Power-down
mode.
The ISL26320, ISL26321, ISL26322, ISL26323, ISL26324,
ISL26325 and ISL26329 feature up to 5kV Human Body
Model ESD survivability and are available in the popular SOIC
and TSSOP packages. Performance is specified for operation
over the full industrial temperature range (-40°C to +125°C).
FN8273
Rev 1.00
September 5, 2013
Features
• Pin-compatible family allows easy design upgrades
• Excellent differential non-linearity (0.7LSB max)
• Low THD: -86dB (typ)
• Simple SPI-compatible serial digital interface
• Low 3mA operating current
• Power-down current between conversions 8µA (typ)
• +5.25V to +2.7V supply
• Excellent ESD survivability: 5kV HBM, 350V MM, 2kV CDM
Applications
• Industrial process control
• Energy measurement
• Multichannel data acquisition systems
• Pressure sensors
• Flow controllers
VDD
VREF
BUFFER
ANALOG INPUTS
DIFFERENTIAL/
SINGLE-ENDED
MUX
ADC
SPI
CNV
SCLK
SDO
SDI
OSC
POR
GND
FIGURE 1. FUNCTIONAL BLOCK DIAGRAM
FN8273 Rev 1.00
September 5, 2013
Page 1 of 23
ISL26320, ISL26321, ISL26322, ISL26323, ISL26324, ISL26325, ISL26329
Application Block Diagram
I
2
C Bus
ANALOG SIGNAL INPUT MODULEs
Pressure/Strain Gage Sensor
VREF
Precision
Amps
Gain
Amplifiers
Active
Filters
RTC
RS-232
MUX and ADC
RS-485
RS-485
DCP
+V
Precision
Amps
+V
Precision
Amps
M
U
X
ADC
VREF
μC
RTC
Master
μC
-V
-V
POWER
Temperature Sensor
VREF
DCP
V
LDO’s
Voltage
Supervisor &
Sequencers
Thermistor
System
Power
+V
Precision
Amps
+V
Precision
Amps
Active
Filters
Switching
Regulator
Core &
I/O Power
V
Buffer, Filters,
Span Drivers
-V
Thermocouple
Switching
Controller
LDO
Switching
Regulators
-V
+V
Precision
Amps
+V
Active
Precision
Amps
Filters
Actuators
+V
Motors
Control loops
Precision
Amps
+V
Precision
Amps
-V
ISO-Thermal
Block
-V
M
U
X
+V
DAC
High Voltage Input Rail ~24V
-V
-V
VREF
Flow Sensor
Loop Supply
Gain
Amplifiers
Differential
Pressure
Transducer
w/
Extractor
Active
Filters
ANALOG SIGNAL OUTPUT MODULE
-V
Single Ended
Controller
+V
Iout
4 -20mA
Vin
+V
Precision
Amps
Isolator
Isolated Power
Precision
Amps
-V
-V
Pin-Compatible Family
MODEL
ISL26310
ISL26311
ISL26312
ISL26313
ISL26314
ISL26315
ISL26319
ISL26320
ISL26321
ISL26322
ISL26323
ISL26324
ISL26325
ISL26329
RESOLUTION
(Bits)
12
12
12
12
12
12
12
12
12
12
12
12
12
12
SPEED
(kHz)
125
125
125
125
125
125
125
250
250
250
250
250
250
250
ANALOG
INPUT
Differential
Single-Ended
Differential
Single-Ended
Differential
Single-Ended
Single-Ended
Differential
Single-Ended
Differential
Single-Ended
Differential
Single-Ended
Single-Ended
INPUT
CHANNELS
1
1
2
2
4
4
8
1
1
2
2
4
4
8
FN8273 Rev 1.00
September 5, 2013
Page 2 of 23
ISL26320, ISL26321, ISL26322, ISL26323, ISL26324, ISL26325, ISL26329
Ordering Information
DESCRIPTION
PART NUMBER
(Notes 1, 2, 3)
ISL26320FBZ
ISL26321FBZ
ISL26322FVZ
ISL26323FBZ
ISL26324FVZ
ISL26325FVZ
ISL26329FVZ
NOTES:
1. Add “-T*” suffix for tape and reel. 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 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.
3. For Moisture Sensitivity Level (MSL), please see device information page for
ISL26320, ISL26321, ISL26322, ISL26323, ISL26324, ISL26325,
ISL26329.
For more information on MSL please see techbrief
TB363.
PART
MARKING
26320 FBZ
26321 FBZ
26322 FVZ
26323 FBZ
26324 FVZ
26325 FVZ
26329 FVZ
RESOLUTION
(Bits)
12
12
12
12
12
12
12
SPEED
(kHz)
250
250
250
250
250
250
250
INPUT
(SE/DIFF)
Diff
SE
Diff
SE
Diff
SE
SE
INPUT
CHANNELS
1
1
2
2
4
4
8
TEMP. RANGE
(°C)
-40 to +125
-40 to +125
-40 to +125
-40 to +125
-40 to +125
-40 to +125
-40 to +125
PACKAGE
(Pb-Free)
8 Ld SOIC
8 Ld SOIC
16 Ld TSSOP
8 Ld SOIC
16 Ld TSSOP
16 Ld TSSOP
16 Ld TSSOP
PKG
DWG #
M8.15
M8.15
M16.173
M8.15
M16.173
M16.173
M16.173
FN8273 Rev 1.00
September 5, 2013
Page 3 of 23
ISL26320, ISL26321, ISL26322, ISL26323, ISL26324, ISL26325, ISL26329
Pin Configurations
ISL26320
(8 LD SOIC)
TOP VIEW
VDD
GND
AIN+
AIN-
1
2
3
4
8
7
6
5
CNV
SCLK
SDO
SDI
ISL26321
(8 LD SOIC)
TOP VIEW
VDD
GND
VREF
AIN0
1
2
3
4
8
7
6
5
CNV
SCLK
SDO
SDI
ISL26323
(8 LD SOIC)
TOP VIEW
VDD
GND
AIN0
AIN1
1
2
3
4
8
7
6
5
CNV
SCLK
SDO
SDI
ISL26322
(16 LD TSSOP)
TOP VIEW
VDD
GND
V R EF
GND
A IN0+
A IN 0-
A IN 1+
A IN 1-
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
CNV
S C LK
SDO
SDI
NC
NC
NC
NC
VDD
GND
VREF
GND
AIN0+
AIN0-
AIN1+
AIN1-
1
2
3
4
5
6
7
8
ISL26324
(16 LD TSSOP)
TOP VIEW
16
15
14
13
12
11
10
9
CNV
SCLK
SDO
SDI
AIN3+
AIN3-
AIN2+
AIN2-
ISL26325
(16 LD TSSOP)
TOP VIEW
VDD
G ND
VREF
G ND
AIN0
NC
AIN1
NC
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
CNV
SCLK
SDO
SDI
AIN3
NC
AIN2
NC
VDD
GND
VREF
GND
AIN0
AIN1
AIN2
AIN3
1
2
3
4
5
6
7
8
ISL26329
(16 LD TSSOP)
TOP VIEW
16
15
14
13
12
11
10
9
CNV
SCLK
SDO
SDI
AIN7
AIN6
AIN5
AIN4
FN8273 Rev 1.00
September 5, 2013
Page 4 of 23
ISL26320, ISL26321, ISL26322, ISL26323, ISL26324, ISL26325, ISL26329
Pin Descriptions
PIN NUMBER
PIN NAME ISL26320 ISL26321
VDD
GND
VREF
AIN0+
AIN0-
AIN1+
AIN1-
AIN2+
AIN2-
AIN3+
AIN3-
AIN0
AIN1
AIN2
AIN3
AIN4
AIN5
AIN6
AIN7
SDI
SDO
SCLK
CNV
NC
AIN+
AIN-
1
2
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
5
6
7
8
-
3
4
1
2
3
-
-
-
-
-
-
-
-
4
-
-
-
-
-
-
-
5
6
7
8
-
-
-
ISL26322
1
2, 4
3
5
6
7
8
-
-
-
-
-
-
-
-
-
-
-
-
13
14
15
16
9, 10, 11, 12
-
-
ISL26323 ISL26324 ISL26325 ISL26329
1
2
-
-
-
-
-
-
-
-
-
3
4
-
-
-
-
-
-
5
6
7
8
-
-
-
1
2, 4
3
5
6
7
8
10
9
12
11
-
-
-
-
-
-
-
-
13
14
15
16
-
-
-
1
2, 4
3
-
-
-
-
-
-
-
-
5
7
10
12
-
-
-
-
13
14
15
16
6, 8, 9, 11
-
-
1
2, 4
3
-
-
-
-
-
-
-
-
5
6
7
8
9
10
11
12
13
14
15
16
-
-
-
DESCRIPTION
Positive Supply Voltage
Ground
Reference Voltage Input
Differential Analog Input, Positive
Differential Analog Input, Negative
Differential Analog Input, Positive
Differential Analog Input, Negative
Differential Analog Input, Positive
Differential Analog Input, Negative
Differential Analog Input, Positive
Differential Analog Input, Negative
Single-Ended Analog Input
Single-Ended Analog Input
Single-Ended Analog Input
Single-Ended Analog Input
Single-Ended Analog Input
Single-Ended Analog Input
Single-Ended Analog Input
Single-Ended Analog Input
Serial Interface Data Input
Serial Interface Data Output
Serial Interface Clock Input
Conversion Control Input
No Connect
Differential Analog Input, Positive
Differential Analog Input, Negative
FN8273 Rev 1.00
September 5, 2013
Page 5 of 23
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