SNAP Analog Input Modules
Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • www.opto22.com
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SNAP Analog Input Modules
DATA SHEET
Form 1065-140815
PAGE
11
0 to 25,000 Hz Analog Rate Input Module
Specifications
Description
The SNAP-AIRATE module provides two channels of
frequency-to-digital conversion. The nominal input range is 0
to 25,000 Hz with an over-range capability to 27,500 Hz. Nine
volts through a 4.7 K ohm pull-up resistor are provided
internally for use with devices that have open collector
outputs. This feature eliminates the need for the user to
provide the pull-up voltage supply and associated wiring,
barrier strips, etc.
The module works with TTL, CMOS, and open collector
outputs. Truly a two-wire hookup, the SNAP-AIRATE module is
ideally suited for use with a tachometer.
Please note that this module does not provide channel-to-
channel isolation. If you need isolated channels, see the SNAP
Isolated Analog Input Modules Data Sheet, form 1182.
Nominal Input Range 0 to 25,000 Hz
Input Over-Range To 27,500 Hz
Resolution 1 Hz
Input Response Time(% of
span / delta Hz / delta time)
10.0% / 2,500 Hz / 0.1 sec
63.2% / 15.8 K Hz / 0.9 sec
99.0% / 24.75 K Hz / 4.2 sec
Data Freshness (Max) 126 ms
DC Common Mode Rejection > -120 dB
AC Common Mode Rejection > -120 dB at 60 Hz
Maximum Operating Common
Mode Voltage
250 V
Accuracy (% full scale)
±4 Hz or ±0.5% of the input fre-
quency (whichever is greater)
Drift: Gain Temperature Coeffi-
cient
200 ppm / °C
Drift: Offset Temperature Coef-
ficient
50 ppm / °C
Input Coupling
Single-ended AC (capacitor
coupled)
Input Amplitude
Sine wave
Square wave
2.5 V to 24 V p-p
0.5 V to 24 V p-p
Minimum Pulse Width 18 microseconds
Input Impedance (Inputs share
the same reference point.)
Pull-up Voltage
Pull-up Resistor
50 K ohms AC coupled
(-input to +input)
6 to 9 V
4.7 K ohms
Isolation 1500 V
Power Requirements 5 VDC (±0.15 V) at 190 mA
Operating Temperature 0 °C to 70 °C
Storage Temperature -40 °C to 85 °C
Wire size 22 to 14 AWG
Torque, hold-down screws 4 in-lb (0.45 N-m)
Torque, connector screws 5.26 in-lb (0.6 N-m)
Agency Approvals UL, FM, CE, RoHS, DFARS
Warranty Lifetime
Part Number Description
SNAP-AIRATE 0–25,000 Hz analog rate input
