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 | Kit Overview
High-side current monitors are likely to encounter overvoltage conditions from transients or when the monitoring circuits are connected, disconnected, or powered down. The circuit, uses the overvoltage protected ADA4096-2ADA4096-2 op-amp connected as a difference amplifier to monitor the high-side current. The ADA4096-2 has input overvoltage protection, without phase reversal or latch-up, for voltages of 32 V higher than and lower than the supply rails.
The circuit is powered by the ADP3336ADP3336 adjustable low dropout 500 mA linear regulator, which can also be used to supply power to other parts of the system, if desired. Its input voltage can range from 5.2 V to 12 V when set for a 5 V output. To save power, the current sensing circuit can be powered down by removing power to the ADP3336; however, the power source, such as a solar panel, can still operate.
This applies voltage to the inputs of the unpowered ADA4096-2ADA4096-2; however, no latch-up or damage occurs for input voltages up to 32 V. If slower throughput rates are required, the AD7920 can also be powered down between samples. The AD7920AD7920 draws a maximum of 5 μW when powered down and 15 mW when powered up. The ADA4096-2 requires only 120 μA under operational conditions. When operating at 5 V, this is only 0.6 mW. The ADP3336 draws only 1 μA in the shutdown mode.
This circuit uses the EVAL-CN0241-SDPZEVAL-CN0241-SDPZ circuit board and the EVAL-SDP-CB1ZEVAL-SDP-CB1Z System Demonstration Platform SDP-B Controller Board. The two boards have 120-pin mating connectors, allowing for the quick setup and evaluation of the circuit’s performance. The EVAL-CN0241-SDPZ board contains the circuit to be evaluated and the SDP-B controller board is used with the CN0241 evaluation software to capture the data from the EVAL-CN0241-SDPZ circuit board.
Ordering Information:
Key Applications: Electronic Test & Measurement, Metering & Energy Monitoring, Power Supplies | |||||||||||
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Development Tools
- PC with a USB port and Windows
XP or Windows Vista (32-bit), or Windows 7 (32-bit) - EVAL-CN0241-SDPZEVAL-CN0241-SDPZ circuit evaluation board
- EVAL-SDP-CB1ZEVAL-SDP-CB1Z controller board
- CN0241 SDP evaluation software
- DC power supply capable of driving 6 V/1 A (EVAL-CFTL-6V-PWRZEVAL-CFTL-6V-PWRZ)
- DC power supply capable of driving 5 V/2.5 A
- 2Ω/12 W load resistor
Technical Documents
Learning Center
Design Elements
Video
Kit Features
Key Features for AD7920AD7920 are as below:
- Throughput Rate: 250 kSPS
- Specified for VDD of 2.35 V to 5.25 V
- Low Power:
- 3.6 mW typ at 250 KSPS with 3 V Supplies
- 12.5 mW typ at 250 KSPS with 5 V Supplies
- Wide Input Bandwidth:
- 70 dB SNR at 100 kHz Input Frequency
- No Pipeline Delays
- Flexible Power/Serial Clock Speed Management
- High Speed Serial Interface SPI/QSPI
/MICROWIRE/DSP Compatible
Key Features for ADP3336ADP3336 are as below:
- High Accuracy Over Line and Load: ±0.9% @ 25°C, ±1.8% Over Temperature
- Ultralow Dropout Voltage: 200 mV (Typ) @ 500 mA
- Requires Only CO = 1.0 µF for Stability
- anyCAP = Stable with Any Type of Capacitor (Including MLCC)
- Current and Thermal Limiting
- Low Noise
- Low Shutdown Current: < 1.0 µA
- 2.6 V to 12 V Supply Range
- 1.5 V to 10 V Output Range
Kit Contents
The Analog Devices EVAL-CN0241-SDPZEVAL-CN0241-SDPZ kit is supplied with below contents:
- Evaluation Board