USB-1608FS Series
USB-1608FS Series
16-Bit, Simultaneous Sampling, Multifunction DAQ
Features
• Eight 16-bit single-ended analog
inputs
• Simultaneous sampling
(1 A/D converter per input)
• Up to 400 kS/s overall
throughput (100 kS/s max for
any channel)
• Eight digital I/O
• Event counter
• External clock I/O
• External digital trigger input
• Available with enclosure and
screw terminals, or as a boardonly OEM version with header
connectors (no case, CD, or USB
cable included)
Supported Operating Systems
The USB‑1608FS-Plus offers 8 simultaneous analog inputs at up to 100 kS/s per channel
(400 kS/s overall), 8 digital I/O, and one event counter input.
• Windows 10/8/7/Vista® 32/64-bit
• Android™
• Linux®
Overview
USB-1608FS Series devices are low-cost, analog input and digital I/O USB devices.
All devices in this series can acquire data from up to eight 16-bit single-ended (SE)
analog inputs simultaneously. These devices also offer eight digital I/O channels,
an external digital trigger input, an event counter, a bidirectional external clock,
and a channel-gain queue feature for configuring a list of channels and gains for
each scan.
USB-1608FS Series Selection Chart
Specification
USB-1608FS
Analog Inputs
USB-1608FS-Plus and USB-1608FS-Plus-OEM†
8 Single-Ended
8 Single-Ended
Sample Rate
(100 kS/s)/(# of channels)
50 kS/s max for any channel
(400 kS/s)/(# of channels)
100 kS/s max for any channel
Channel-Gain Queue
Up to 8 unique, consecutive elements
Up to 8 unique, ordered elements; consecutive not
required
Digital Output Current
±2.5 mA per pin
±24 mA per pin
Calibration
Factory and user calibration
Factory calibration only
External Clock Input
50 kHz max
100 kHz max
Trigger Sensitivity
Edge sensitive
Edge or level sensitive
Event Counter
One 32-bit; 1 MHz input frequency max
DAQami Support
✔
✔
UL for Android Support
–
✔
† The USB-1608FS-Plus-OEM provides header connectors instead of screw terminals for signal I/O.
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USB-1608FS Series
General Information
USB-1608FS Series Block Diagram
PC +5V
PGA = 1, 2, 5, 10
A/D 0
Full-speed
USB 2.0
Compliant
Interface
A/D 1
A/D 2
DIO
(High Drive on
USB-1608FS-Plus/
USB-1608FS-Plus-OEM)
USB
Microcontroller
SPI
A/D 3
A/D 4
8
Signal I/O Connectors
Signal I/O Connectors
32-bit Event Counter
TRIG_IN
SYNC
A/D 5
32k x 16
SRAM
A/D 6
A/D 7
Channel-Gain Queue
Analog Input
All USB-1608FS Series devices have a dedicated A/D converter
per analog channel for simultaneous sampling. The devices
offer software-selectable analog input ranges for ±10 V, ±5 V,
±2 V, and ±1 V.
The channel-gain queue lets you configure a list of channels
and gains for each scan. Each channel can have a different gain
setting. The gain settings are stored in a channel-gain queue list
that is written to local memory on the device.
Sample Rate
The channel-gain queue list for both devices can contain up to
eight unique channels.
USB-1608FS Series devices offer the following sample rates when
scanning continuously to computer memory (hardware-paced
mode):
On the USB-1608FS, the channels must be consecutive and listed
in increasing order.
On the USB-1608FS-Plus/USB-1608FS-Plus-OEM, the channels can
be non-consecutive, but still must be listed in increasing order.
• USB-1608FS-Plus/USB-1608FS-Plus-OEM - Total rate of
400 kS/s divided by the number of channels sampled;
maximum rate of 100 kS/s per channel.
Digital I/O
• USB-1608FS - Total rate of 100 kS/s divided by the number
of channels sampled; maximum rate of 50 kS/s per
channel.
Both devices provide eight digital I/O connections. Each digital
channel is individually-configurable for input or output. When
configured for input, you can use the digital I/O terminals to
detect the state of any TTL‑level input.
Simultaneous Sampling
On the USB-1608FS-Plus, the digital I/O channels are high-drive
(24 mA) connections.
In hardware paced mode, all devices can acquire data from up to
eight channels simultaneously. The analog data is continuously
acquired, converted to digital values, temporarily stored in the
onboard FIFO buffer, and periodically uploaded to the computer.
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Pull-Up/Pull-Down Configuration
USB-1608FS Series devices have a user-configurable internal jumper to configure the digital bits for pull-up (default) or pull-down.
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USB-1608FS Series
General Information
Counter Input
USB-1608FS-Plus-OEM Version
USB-1608FS Series devices have a 32-bit event counter that can
accept a signal up to 1 MHz. The internal counter increments
when the TTL levels transition from low to high.
The USB-1608FS-Plus-OEM has a board-only form factor with
header connectors for OEM and embedded applications (no case,
CD, or USB cable included). All devices can be further customized
to meet customer needs.
External Clock I/O
Each USB-1608FS Series device has a bidirectional external clock
terminal. When configured for input, A/D conversions can be
paced by an external source.
The USB-1608FS supports TTL-level input signals up to 50 kHz.
The USB-1608FS-Plus/USB-1608FS-Plus-OEM supports TTL-level
input signals up to 100 kHz.
When configured for output, both devices can pace A/D conversions on a second device and acquire data from all input channels
simultaneously.
The USB-1608FS-Plus-OEM has the same specifications as the
USB-1608FS-Plus, but comes in a board-only form factor with header
connectors instead of screw terminals.
Trigger Input
USB-1608FS Series devices provide an external digital trigger input.
The USB-1608FS trigger mode is edge sensitive and softwareselectable for rising or falling edge
The USB-1608FS-Plus/USB-1608FS-Plus-OEM trigger mode is
edge or level sensitive. Edge sensitive is software-selectable for
rising or falling edge. Level sensitive is software-selectable for
high or low level.
Calibration
The USB-1608FS supports field calibration with InstaCal.
Perform calibration whenever the ambient temperature
changes by more than ±10 °C from the last calibration. The
USB-1608FS-Plus/USB-1608FS-Plus-OEM do not support field
calibration.
All USB-1608FS Series devices are factory-calibrated. Specifications
are guaranteed for one year. For calibration beyond one year,
return the device to the factory for recalibration.
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USB-1608FS Series
Software Information
Software Support
USB-1608FS Series devices are supported by the software in the table below.
Ready-to-Run Applications
DAQami
Advanced data logging application with drag-and-drop software interface that is used to acquire,
view, and log data. DAQami can be configured to log analog, digital, and counter channels, and to
view that data in real-time or post-acquisition on user-configurable displays. Windows OS
DAQami is available as a purchased software download.
InstaCal
TracerDAQ  and
TracerDAQ Pro
An interactive installation, configuration, and test utility for MCC hardware. Windows OS
InstaCal is included with the free MCC DAQ Software bundle (CD/download).
Virtual strip chart, oscilloscope, function generator, and rate generator applications used to generate, acquire, analyze, display, and export data. Supported features may vary by hardware. The Pro
version provides enhanced features. Windows OS
TracerDAQ is included with the free MCC DAQ Software bundle (CD/download).
TracerDAQ Pro is available as a purchased software download.
General-Purpose Programming Support
Universal Library (UL)
Programming library of function calls for C, C++, VB, C# .Net, and VB .Net using Visual Studio
and other IDEs. Windows OS
The UL is included with the free MCC DAQ Software bundle (CD/download).
UL for Android
Programming library of function calls for Java programmers who develop apps for Android-based
tablets and phones. UL for Android communicates with select MCC DAQ devices. Supports Android
project development on Windows, Linux, Mac OS X
UL for Android is included with the free MCC DAQ Software bundle (CD/download).
Linux Driver
Open-source Linux drivers are available for most MCC devices. Example programs are also provided.
Application-Specific Programming Support
ULx for NI LabVIEW
A comprehensive library of VIs and example programs for NI LabVIEW that is used to develop
custom applications that interact with most MCC devices. Windows OS
ULx for NI LabVIEW is included with the free MCC DAQ Software bundle (CD/download).
DASYLab
Icon-based data acquisition, graphics, control, and analysis software that allows users to create
complex applications in minimal time without text-based programming.
DASYLab is available as a purchased software download. Windows OS
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USB-1608FS Series
Specifications
Specifications
Accuracy
Specifications apply to all USB-1608FS Series devices
unless noted otherwise
Analog Input DC Voltage Measurement Accuracy
Calibrated Absolute Accuracy
USB-1608FS-Plus specifications also apply to the
USB-1608FS-Plus-OEM unless noted otherwise.
Analog Input
A/D converter Type: 16-bit successive approximation type
Channels: 8 single-ended
Input configuration: Individual A/D per channel
Sampling method: Simultaneous
Absolute maximum input voltage
CHx IN relative to GND: ±15 V max
Input impedance: 100 MΩ min
Input ranges: ±10 V, ±5 V, ±2 V, ±1 V; software-selectable
per channel
Sample rate (Hardware Paced)
USB-1608FS: 0.6 S/s to 50 kS/s, software-selectable
USB-1608FS-Plus: 0.01 S/s to 100 kS/s, softwareselectable
Throughput
Software paced: 500 S/s all channels
Hardware paced (system-dependent)
USB-1608FS: (100 kS/s)/(# of channels) max, 50 kS/s max for any channel
USB-1608FS-Plus: (400 kS/s)/(# of channels) max, 100 kS/s max for any channel
Burst scan ≤ 32,768 total samples (uses onboard
FIFO)
USB-1608FS: (200 kS/s)/(# of channels) max, 50 kS/s max for any channel
USB-1608FS-Plus: (800 kS/s)/(# of channels) max, 100 kS/s max for any channel
Gain queue
USB-1608FS: Up to eight elements; one gain element
per unique, consecutive channel; software-selectable
USB-1608FS-Plus: Up to eight elements; one gain
element per unique, ordered channel; softwareselectable
Resolution: 16 bits
No missing codes
USB-1608FS: 15 bits
USB-1608FS-Plus: 16 bits
Crosstalk
Signal DC to 25 kHz: –80 dB
CAL output (USB-1608FS only): 0.625 V, 1.25 V,
2.5 V, 5 V
CAL output accuracy (USB-1608FS only): 0.5% typ,
1.0% max (actual values used for calibration are
measured and stored in EEPROM)
CAL current (USB-1608FS Only): ±5 mA max
Trigger source (software-selectable)
External digital: TRIG_IN
Range
Accuracy
±10 V
±5 V
±2 V
±1 V
5.66 mV
2.98 mV
1.31 mV
0.68 mV
Accuracy Components
All values are (±)
Range
Gain Error
(% of Reading)
Gain Error at Full
Scale
Offset
±10 V
±5 V
±2 V
±1 V
0.04
0.04
0.04
0.04
4.00 mV
2.00 mV
0.80 mV
0.40 mV
1.66 mV
0.98 mV
0.51 mV
0.28 mV
Noise Performance*
Range
Typical Counts
Least Significant Bit Root Mean Square
(LSBRMS)
±10 V
±5 V
±2 V
±1 V
10
10
11
14
1.52
1.52
1.67
2.12
* Summarizes the noise performance for USB-1608FS Series devices. Noise distribution is determined by gathering 50 kS with inputs tied to ground at the user connector. Samples are gathered at the maximum specified
sample rates of 50 kS/s (USB-1608FS) and 100 kS/s (USB-1608FS-Plus).
External Trigger
Digital Input/Output
Digital type
USB-1608FS: CMOS
USB-1608FS-Plus: 5 V TTL
Number of I/O: 8 (DIO0 through DIO7)
Configuration: Independently configured for input
or output
Pull-Up/pull-down configuration: All pins pulled up
to 5 V via 47 kΩ resistors (default). May be changed
to pull-down using an internal jumper.1
Input high voltage threshold: 2.0 V min
Input high voltage limit: 5.5 V absolute max
Input low Voltage threshold: 0.8 V max
Input low Voltage limit: –0.5 V absolute min; 0 V
recommended min
Output high Voltage
USB-1608FS (IOH = –2.5 mA): 3.8 V min
USB-1608FS-Plus: 4.4 V min (IOH = –50 µA); 3.76 V
min (IOH = –24 mA)
Output low voltage
USB-1608FS (IOL = 2.5 mA): 0.44 V max
USB-1608FS-Plus: 0.1 V max (IOL = 50 µA); 0.44 V
max (IOL = 24 mA)
Power on and reset state: Input
1 USB‑1608FS hardware revisions E and later may
be changed to pull-down using an internal userconfigurable jumper. Previous revisions can be
configured for pull-down at the factory.
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Trigger source
External digital: TRIG_IN
Trigger mode (software-selectable)
USB-1608FS: Edge sensitive: user configurable for
CMOS compatible rising or falling edge
USB-1608FS-Plus: Edge sensitive or level sensitive:
user configurable for CMOS compatible rising or
falling edge, high or low level.
Trigger Latency
USB-1608FS: 10 µs max
USB-1608FS-Plus: 2 µs + 1 pacer clock cycle max
Trigger Pulse Width: 1 µs min
Input Type: Schmitt trigger, 47 kΩ pull-down to ground
Schmitt Trigger Hysteresis: 1.01 V typ, 0.6 V min,
1.5 V max
Input High Voltage Threshold: 2.43 V typ, 1.9 V min,
3.1 V max
Input High Voltage Limit: 5.5 V absolute max
Input Low Voltage Threshold: 1.42 V typ, 1.0 V min,
2.0 V max
Input Low Voltage Limit: –0.5 V absolute min, 0 V
recommended min
External Clock I/O
Pin Name: SYNC
Pin Type: Bidirectional
Direction (Software-Selectable)
Input: Receives A/D pacer clock from external source;
Output: Outputs internal A/D pacer clock
Input Clock Rate
USB-1608FS: 50 kHz max
USB-1608FS-Plus: 100 kHz max
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USB-1608FS Series
Specifications & Ordering
Ordering Information
Clock Pulse Width
Input: 1 µs min
Output
USB-1608FS: 5 µs min
USB-1608FS-Plus: 4 µs min
Input Clock Mode: Edge sensitive, rising edge
Input Type: Schmitt trigger, 47 kΩ pull-down to ground
Schmitt Trigger Hysteresis: 1.01 V typ, 0.6 V min, 1.5 V max
Input High Voltage Threshold: 2.43 V typ, 1.9 V min, 3.1 V max
Input High Voltage Limit: 5.5 V absolute max
Input Low Voltage Threshold: 1.42 V typ, 1.0 V min, 2.0 V max
Input Low Voltage Limit: –0.5 V absolute min, 0 V recommended min
Output High Voltage: 4.4 V min (IOH = –50 µA), 3.80 V min (IOH = –8 mA)
Output Low Voltage: 0.1 V max (IOL = 50 µA), 0.44 V max (IOL = 8 mA)
Part No.
Description
USB-1608FS
USB-based DAQ device with 8 simultaneous 16-bit
100 kS/s analog inputs and 8 digital I/O (includes
USB cable and MCC DAQ software CD)
USB-1608FS-Plus
USB-based DAQ device with 8 simultaneous 16-bit
100 kS/s analog inputs, and 8 high-current digital
I/O (includes USB cable and MCC DAQ software
CD)
USB-1608FS-Plus-OEM
Board-only DAQ device with 8 simultaneous 16-bit
100 kS/s analog inputs and 8 high-current digital
I/O
Counter
Pin Name: CTR
Counter Type: Event counter
Number Of Channels: 1
Input Type: Schmitt trigger, 47 kΩ pull-down to ground
Input Source: CTR screw terminal
Resolution: 32 bits
Schmitt Trigger Hysteresis: 1.01 V typ, 0.6 V min, 1.5 V max
Input High Voltage Threshold: 2.43 V typ, 1.9 V min, 3.1 V max
Input High Voltage Limit: 5.5 V absolute max
Input Low Voltage Threshold: 1.42 V typ, 1.0 V min, 2.0 V max
Input Low Voltage Limit: –0.5 V absolute min, 0 V recommended min
Input Frequency: 1 MHz max
High Pulse Width: 500 ns min
Low Pulse Width: 500 ns min
Software also Available from MCC
DAQami
Easy-to-use advanced data logging software to
acquire, view, and log data
TracerDAQ Pro
Out-of-the-box virtual instrument suite with strip
chart, oscilloscope, function generator, and rate
generator – professional version
DASYLab
Icon-based data acquisition, graphics, control, and
analysis software
Power
Supply Current
USB Enumeration: < 100 mA
Including DIO and SYNC Output Loading: < 500 mA
+5 V USB Power Available (Connected to Externally-Powered Root Port Hub or a
Self-Powered Hub): 4.5 V min, 5.25 V max
Output Current (Total Amount of Current that can be Sourced from the
USB +5 V and Digital Outputs): 300 mA max
Memory
Data FIFO: 32,768 samples, 65,536 bytes
USB-1608FS
EEPROM: 1,024 bytes
EEPROM Configuration
Address 0x000 to 0x07F: Reserved access,128 bytes system data
Address 0x080 to 0x1FF: Read/write access, 84 bytes cal data
Address 0x200 to 0x3FF: Read/write access, 512 bytes user area
USB-1608FS-Plus:
EEPROM: 2,048 bytes (768 bytes calibration, 256 bytes user,1,024 bytes
reserved)
General
Device Type: USB 2.0 (full-speed)
Device Compatibility: USB 1.1, USB 2.0
Environmental
Operating Temperature Range: 0 °C to 70 °C
Storage Temperature Range: –40 °C to 70 °C
Humidity: 0% to 90% non-condensing
Mechanical
Dimensions (L × W × H)
USB-1608FS, USB-1608FS-Plus: 79 × 82 × 27 mm (3.10 × 3.20 × 1.05 in.)
USB-1608FS-Plus-OEM: 73.66 × 81.28 × 13.72 mm (2.90 × 3.20 × 0.54 in.)
USB Cable Length: 3 m (9.84 ft) max
User Connection Length: 3 m (9.84 ft) max
Microcontroller
Type: High performance 32-bit RISC
Signal I/O Connector Type
USB-1608FS, USB-1608FS-Plus: Screw terminal
USB-1608FS-Plus-OEM: Two 20-pin, 0.1 in. pitch headers
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Document Revision 4, February, 2016
© Copyright 2016, Measurement Computing Corporation
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