Overview

The Pi-Plates ADCplate is the most precise analog to digital converter available for the Raspberry Pi Single Board Computer. With eight single-ended / four differential voltage inputs, four 4-20mA current inputs, and five 30V tolerant digital inputs, the ADCplate is a perfect data acquisition system for a laboratory bench or a factory floor. And, like all Pi-Plates, the ADCplate can be stacked to increase the analog input count to 64 by using eight plates. This plate is compatible with all of our other products allowing you to create the perfect customized stack of Pi-Plates to collect data from your process.

Features

Eight, single ended or four differential voltage inputs with 24bit precision
Voltage input range of +/-20V with accuracy guaranteed over +/-10V
Four, 0-20mA current inputs with 24bit precision
Five 30V tolerant digital inputs.
All inputs include transient, overvoltage and overcurrent protection.
Single channel sample rates as high as 31.25Khz
50Hz / 60Hz rejection as high as 125 / 130dB
Onboard 32-bit ARM processor offloads all timing and data buffering from Raspberry Pi
High performance features include Block Mode (8192 readings per block) and Streaming Mode
Pluggable terminal blocks for simplified setup and quick changes
Up to eight ADCplates can be stacked together
Onboard programmable LED
Bidirectional trigger allows for synchronized clocking of multiple ADCplates

General

100% Tested and Calibrated
Dedicated onboard processor
Pluggable 3.5mm screw terminal connections
Minimum RPi pins required: 15, 16, 22, and 26 while sharing pins 19, 21, and 23.
Each ADCplate also has the option of using one of pins 29, 31,33,35,37,36,38,and 40. See Specifications for more details.
All features accessible via Python command set
Supported by Node-RED
Compatible with all 40 pin versions of the Raspberry Pi
Can be used in combination with all members of the Pi-Plates family
Onboard bootloader for firmware updates.
Detailed Online Users Guide with Examples
Dimensions (with all terminal block plugs attached): 120mm long x 85mm wide x 25mm high

ADCplate

A precision 24bit analog to digital converter with 8SE/4DE voltage inputs, four 4-20mA inputs, and four 30V tolerant Digital Inputs.

$99.99Add to cart

Add a DINplate

Our low cost scalable enclosure to mount your Pi-Plate stack to a DIN rail.

$29.99Add to cart

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CASEplate

ADCplate Specifications

General

A/D Converter Type: Sigma Delta
ADC Resolution: 24 bits
Max Operating Temperature: 60C
No Missing Codes: 24bits
Maximum Sample Rate: 31.25Khz w/ one channel enabled

Voltage Inputs

Eight Single Ended (Sx - GND)
Four Differential (Dx-Dx+1)
Impedance: 1MΩ
Differential input range: +/-10V
Absolute maximum input voltage: +/-20V
DC Common Mode Rejection: 85dB
50 and 60Hz Common Mode Rejection: see ADC Performance Table below
Noise: see ADC Performance Table below
Calibrated Accuracy: +/-100μV
Resolution: see ADC Performance Table below
Conversion Time: see ADC Performance Table below
Anti Alias Filter: 188Khz
3dB Cut Off Frequency: see ADC Performance Table below
Transient Protection Threshold: +/-33V

Current Inputs

Input Count: 4
Input Range: 0 to 24mA
Impedance: 260Ω
Resolution: see ADC Performance Table below
Conversion Time: see ADC Performance Table below
Offset Error +/- 2μA
Gain Error: +/- 0.02%
3dB Cut Off Frequency: see ADC Performance Table below
Transient Protection Threshold: +/-10V

Digital Inputs

Input High Voltage: > 2.4V
Input Low Voltage: <1.0V
Maximum Input Voltage: 30V
Input Impedance (DIN0-DIN3): 10KΩ to ground
Input Impedance (DIN4): 100KΩ to ground
Transient Protection Threshold: +/-33V

ARM Processor

RAM: 32Kbytes (8,192 ADC readings)
Raspberry Pi SPI data rate: 4Mbps
CPU clock: 64Mhz

Raspberry Pi Interface Signals

SPI signals
- CE1: pin 26 / GPIO07
- CLK: pin 23 / GPIO11
- MOSI: pin 19 / GPIO10
- MISO: pin 21 / GPIO09
Pi-Plate Handshake Signals
- FRAME: pin 22 / GPIO25
- ACK: pin 16 / GPIO23
Event Signals (Optional)
- SRQ: pin 15 / GPIO22 - can be shared with other Pi-Plates
- DR0: pin 29 / GPIO05- can be used by ADCplate at address 0
- DR1: pin 31 / GPIO06- can be used by ADCplate at address 1
- DR2: pin 33 / GPIO13- can be used by ADCplate at address 2
- DR3: pin 35 / GPIO19- can be used by ADCplate at address 3
- DR4: pin 37 / GPIO26- can be used by ADCplate at address 4
- DR5: pin 40 / GPIO21- can be used by ADCplate at address 5
- DR6: pin 38 / GPIO20- can be used by ADCplate at address 6
- DR7: pin 36 / GPIO16- can be used by ADCplate at address 7

ADCplate Performance versus Sample Rate

Sample Rate Value	Single Channel Sample Rate (SPS)	Settling Time (msec)	Multi Channel Sample Rate (SPS)	Cutoff Frequency (Hz)	50Hz Rejection (dB)	60Hz Rejection (dB)	Equivalent Number of Bits Voltage	Equivalent Number of Bits Current	rms Noise (uV / nA)
0	1.25	2400	1.25	0.3	-125.63	-130.43	22.7	24	2.9 / 2.4
1	2.5	1200	2.5	0.6	-108.66	-113.49	22.7	24	3.0 / 2.6
2	5	600	5	1.3	-103.09	-107.92	22.4	24	3.5 / 3.1
3	10	300	10	2.6	-101.71	-106.52	22.4	24	3.7 / 3.8
4	16.67	60	16.67	10	-90	-90	21.9	24	5.38 / 7.25
5	20	50	20	10	-85	-85	21.8	24	5.54 / 7.26
6	25	40	25	10	-62	-62	21.6	23.6	6.09 / 7.68
7	50	60	49.68	12.8	-100.76	-46.95	21.8	23.7	5.3 / 7.2
8	59.98	50.02	59.52	15.4	-40.34	-105.8	21.6	23.6	6.2 / 7.6
9	100.2	10	100.2	44	NA	NA	21.3	20.6	8.0 / 13
10	200.3	5	200.3	89.4	NA	NA	20.6	20.1	13 / 18
11	381	2.63	380.95	174.2	NA	NA	20.2	19.9	17 / 21
12	504	1.99	503.8	234	NA	NA	19.9	19.4	21 / 29
13	1007	0.993	1007	502	NA	NA	19.5	18.8	27 / 43
14	2597	0.385	2597	1664	NA	NA	19.7	18	47 / 75
15	5208	0.321	3115	2182	NA	NA	18.3	17.9	62 / 84
16	10415	0.225	4444	3944	NA	NA	17.9	17.4	82 / 113
17	15625	0.193	5181	5164	NA	NA	17.7	17.2	94 / 136
18	31250	0.161	6211	6776	NA	NA	17.5	17	106 / 155