OPT ADC 10k 32b 1cha (HPM7177)
Project description
The OPT ADC 10k 32b 1cha is a single channel 10kSPS 32 bit ADC card
in the format defined by the CERN TE-EPC group for use with the Function
Generator Controller (FGC 3.2) . It is also known under the name HPM7177.
The device is a metrology-grade ADC for the highest accuracy class
in the HL-LHC accelerator. CERN will need over a hundred.
The design is based on a commercial ADC, the Analog Device AD7177-2. It is a standalone unit that interfaces through an optical fibre for the read-out and synchronization. The target analog signal bandwidth is 2000 Hz, and the main design objectives are very low 1/f noise and excellent short-term stability and accuracy with an effective resolution over 23 bits for a bandwidth below 10 Hz.
In the second half of 2019 several prototypes have been produced and tested. Based on this feedback, a revised version (V2) was prepared in 2020 and will be tested by the end of the year. In 2021 a full metrological characterization of the device will be carried out and presented.
A block diagram of the device is available here
Left: Fully assembled device Right: Open unit with ADC mezzanine removed
Other images: Bottom side of the ADC mezzanine board -
Test setup with 4 units in a climatic chamber
Specifications
Parameter | Value |
---|---|
ADC device | Analog Devices AD7177-2 |
ADC type | 32-Bit, 10 kSPS, Sigma-Delta ADC with 100 µs Settling and True Rail-to-Rail Buffers |
bits/sample | 32 bit |
effective resolution | >23 bits for BW < 10 Hz |
short-term stability | >25 bits (<20 parts-per-billion) |
temperature drift (offset and gain) | <0.1 ppm/°C from 20°C to 40°C |
INL | <0.6 ppm (0 to +10 V) |
SNR | >120 dB at 500 Hz bandwidth |
max. sample rate | 10 kSPS |
analog bandwidth | 5 kHz, DC-coupled |
channels | 1 |
connectors | 1 x LEMO 0B.302 for input signal |
input impedance | 10 MOhm (differential), 5 MOhm (common-mode) |
DC CMRR | >120 dB |
input range | +/-10 V nominal with 30% over-range |
backplane interface | only for power, ID and production test |
Read-out interface | plastic optical fibre, bi-directional USB (optional) |
Clock source | External: synchronization pulses over optical fibre / Internal |
Project Information
- Official production documentation:
- EDA-04060-V2 - Main module
- EDA-04061-V2 - ADC mezzanine board
- EDA-04062-V1.1 - Input connector grounding board
- EDA-04259-V1-0 - Power supply module
- EDA-04258-V1-0 - 19" chassis for two HPM7177 units
- EDA-04088-V1-0 - Mechanical part used for mounting the resistor arrays and LTZ1000 on the mezzanine board
- The documentation for the older V1 is available here:
- Preliminary characterization report (Dec.2019)
- Presentation at High Luminosity LHC Project Technical Coordination Committee at 13.02.2020
- Protocol on the optical fibre
- Accelerating News article on HPM7177
- Background information
- Discourse forum
- Users
- Frequently Asked Questions
Contacts
Commercial producers
- Not yet commercially available.
General question about project
- Nikolai Beev - CERN
Status
Date | Event |
---|---|
04-05-2018 | Start working on project. First prototype design expected in second half 2019. |
20-12-2019 | First prototype series evaluated. |
27-01-2020 | POSTPONED DUE TO COVID-19. Characterization tests will be done in PTB, the National Metrology Institute of Germany. |
19-02-2020 | Added link to 13.02.2020 Hi Lumi TCC talk |
03-03-2020 | Added datasheets of Vishay resistor arrays |
11-03-2020 | Block diagram added. |
30-03-2020 | Added link to Accelerating News article on HPM7177 (local file copy is here) |
17-08-2020 | Added links to V2 documentation (HPM7177) and the power supply (V1) and 19" chassis (V1). |
18-08-2020 | Block diagram updated to V2 |
10-12-2020 | Added link to EPC group talk on HPM7177 |
07-01-2021 | Added link to EDA for the mechanical part used for special component mounting EDA-04088-V1 |
03 February 2020