Datasheet

Measurement Computing [phone]
4
[e-mail] mccdaq.com
MCC 118
May 2020. Rev 6
DS-MCC-118 © Measurement Computing Corporation
Specifications
All specifications are subject to change without notice.
Typical for 25 ˚C unless otherwise specified.
Analog Input
A/D converter type: Successive approximation
ADC resolution: 12 bits
Number of channels: 8 single-ended
Input voltage range: ±10 V
Absolute maximum input voltage
CHx relative to GND: ±25 V max (power on or power off)
Input impedance: 1 MΩ (power on or power off)
Input bias current
10 V input: –12 µA
0 V input: 2 µA
–10 V input: 12 µA
Monotonicity: Guaranteed
Input bandwidth, small signal (–3 dB): 150 kHz
Maximum working voltage
Input range relative to AGND: ±10.1 V max
Crosstalk (adjacent channels, DC to 10 kHz): –75 dB
Input coupling: DC
Recommended warm-up time: 1 minute min
Sample rate, hardware paced
Internal scan clock: 0.004 S/s to 100 kS/s, software-selectable
External scan clock: 100 kS/s max
Sampling mode: 1 A/D conversion for each configured channel per clock
Conversion time, per channel: 8 µs
Scan clock source
Internal scan clock
External scan clock input on terminal CLK
Channel queue: Up to eight unique, ascending channels
Throughput, Raspberry Pi
®
2 / 3 / 4
Single board: 100 kS/s max
Multiple boards: Up to 320 kS/s aggregate*
Throughput, Raspberry Pi A+ / B+
Single board: Up to 100 kS/s*
Multiple boards: Up to 100 kS/s aggregate*
* When using multiple boards, throughput depends on the load on the Raspberry Pi
processor. The highest throughput may be achieved by using a Raspberry Pi 3 B+.
Accuracy
Analog Input DC Voltage Measurement Accuracy
Range: ±10 V
Gain error (% of reading): 0.098 max
Offset error: 11 mV max
Absolute accuracy at full scale: 20.8 mV
Gain temperature coefficient (% reading/°C): 0.016
Offset temperature coefficient (mV/°C): 0.87
Noise Performance
For peak to peak noise distribution, the input channel is connected to AGND at the
input terminal block, and 12,000 samples are acquired at the maximum throughput.
Range: ±10 V
Counts: 5
LSBrms: 0.76
External Digital Trigger
Trigger source: TRIG input
Trigger mode: Software-selectable for rising or falling edge, or high or low level
Trigger latency:
Internal scan clock: 1 µs max
External scan clock: 1 µs + 1 scan clock cycle max
Trigger pulse width: 125 ns min
Input type: Schmitt trigger, weak pull-down to ground (approximately 10 K)
Input high voltage threshold: 2.64 V min
Input low voltage threshold: 0.66 V max
Input voltage limits: 5.5 V absolute max, –0.5 V absolute min,
0 V recommended min
External Scan Clock Input/Output
Terminal name: CLK
Terminal types: Bidirectional, defaults to input when not sampling analog channels
Direction (software-selectable):
Output: Outputs internal scan clock, active on rising edge
Input: Receives scan clock from external source, active on rising edge
Input clock rate: 100 kHz max
Clock pulse width: 400 ns min
Input type: Schmitt trigger, weak pull-down to ground (approximately 10 K),
protected with a 150 Ω series resistor
Input high voltage threshold: 2.64 V min
Input low voltage threshold: 0.66 V max
Input voltage limits: 5.5 V absolute max, –0.5 V absolute min, 0 V recom-
mended min
Output high voltage: 3.0 V min (IOH = –50 µA), 2.65 V min (IOH = –3 mA)
Output low voltage: 0.1 V max (IOL = 50 µA), 0.8 V max (IOL = 3 mA)
Output current: ±3 mA max
Memory
Data FIFO: 7 K (7,168) analog input samples
Non-volatile memory: 4 KB (ID and calibration storage, no user-modifiable
memory)
Power
Supply current, 3.3 V supply:
Typical: 35 mA
Maximum: 55 mA
Interface
Raspberry Pi GPIO pins used:
GPIO 8, GPIO 9, GPIO 10, GPIO 11 (SPI interface)
ID_SD, ID_SC (ID EEPROM)
GPIO 12, GPIO 13, GPIO 26 (Board address)
Data interface type: SPI slave device, CE0 chip select
SPI mode: 1
SPI clock rate: 10 MHz, max
Environment
Operating temperature: 0 °C to 55 °C
Storage temperature: –40 ˚C to 85 °C max
Relative humidity: 0% to 90% non-condensing
Mechanical
Dimensions (L × W × H): 65 × 56.5 × 12 mm (2.56 × 2.22 × 0.47 in.) max
Order Information
Hardware
Part No. Description
MCC 118 12-bit, 8-channel voltage measurement DAQ HAT.
Raspberry Pi model with the 40-pin GPIO connector
required.
MCC 118-OEM 12-bit, 8-channel voltage measurement DAQ HAT with
(unpopulated) header connectors instead of screw
terminals. Raspberry Pi model with the 40-pin GPIO
connector required.
Software
Part No. Description
MCC DAQ
HAT Library
Open-source library for developing applications in C, C++,
and Python on Linux for MCC DAQ HAT hardware.
Available for download on GitHub at https://github.com/
mccdaq/daqhats.
Specifications and Ordering