| Device type | Current sensing |
| Input range (Vp-p) | 250mV |
| Interface type | Serial |
| Sample rate (Max) (MSPS) | 0.04 |
| Rating | Catalog |
| Isolation (kV peak) | 4 |
| CMTI (Min) (kV/μs) | 15 |
| Number of input channels | 1 |
| Architecture | Delta-Sigma |
| SNR (dB) | 85 |
| Operating temperature range (C) | -40 to 105 |
| INL (Max) (+/-LSB) | 6 |
| Power consumption (Typ) (mW) | 80 |
- 16-Bit Resolution
- SNR: 80.5dB min
- THD: –88dB max (AMC1203B)
- ±280mV Input Range with +5V Supply
- Internal 2.5V Reference Voltage: 1% Accuracy
- Gain Error: ±1% (AMC1203B)
- UL1577, IEC60747-5-2 (VDE0884, Rev. 2), and IEC61010-1 Approved
- Isolation: 4000VPEAK,
Working Voltage: 560V - Transient Immunity: 15kV/μs
- Isolation: 4000VPEAK,
- Typical 25-Year Life at Rated Working Voltage
(see Application Report SLLA197) - Specified Temperature Range:
–40°C to +105°C - APPLICATIONS
- Shunt Based Current Sensing in:
- Motor Control
- Uninterruptible Power Supplies
- Power Inverters
- Industrial Process Control
- Shunt Based Current Sensing in:
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The AMC1203 is a 1-bit, 10MHz, isolated delta-sigma (ΔΣ) modulator with an output buffer separated from the input interface circuitry by a silicon dioxide (SiO2) isolation barrier. This barrier provides galvanic isolation of up to 4000VPEAK. Used in conjunction with isolated power supplies, these devices prevent noise currents on a data bus or other circuits from entering the local ground and interfering with or damaging sensitive circuitry.
The AMC1203 modulator operates from a +5V supply with a dynamic range of 95dB. The differential inputs are ideal for direct connection to shunt resistors or other low-level signal sources. With the appropriate digital filter and modulator rate, the device can be used to achieve 16-bit analog-to-digital (A/D) conversion with no missing codes. An effective resolution of 14 bits and an SNR of 85dB (typical) can be maintained with a sinc3 filter with a decimation ratio of 256.
The modulator output is translated to a balanced signal and then transferred by the capacitive isolation barrier. Across the isolation barrier, a differential comparator receives the logic transition information, and then sets or resets a flip-flop and the output circuit accordingly.
The AMC1203 is available in SOP-8 gull-wing, SOP-8, and SOIC-16 packages. The AMC1203 is characterized for operation over the ambient temperature range of –40°C to +105°C.
