The AMC3306M25 is a precision, isolated delta-sigma (ΔΣ) modulator, optimized for shunt-based current measurements. The fully integrated, isolated DC/DC converter allows single-supply operation from the low-side of the device, which makes the device a unique solution for space-constrained applications. The reinforced capacitive isolation barrier is certified according to VDE V 0884-11 and UL1577 and supports a working voltage of up to 1.2 kVRMS.
The isolation barrier separates parts of the system that operate on different common-mode voltage levels and protects the low-voltage side from hazardous voltages and damage.
The input of the AMC3306M25 is optimized for direct connection to a low-impedance shunt resistor or other, low-impedance voltage sources with low signal levels. The excellent DC accuracy and low temperature drift support accurate current measurements over the extended industrial temperature range from –40°C to +125°C.
By using a digital filter (such as a sinc3 filter) to decimate the bitstream, the device can achieve 16 bits of resolution with a dynamic range of 85 dB at a data rate of 78 kSPS.
PART NUMBER | PACKAGE | BODY SIZE (NOM) |
---|---|---|
AMC3306M25 | SOIC (16) | 10.30 mm × 7.50 mm |
Changes from Revision A (September 2020) to Revision B (April 2021)
Changes from Revision Original (May 2020) to Revision A (September 2020)
PIN | TYPE | DESCRIPTION | |
---|---|---|---|
NO. | NAME | ||
1 | DCDC_OUT | Power | High-side output of the DC/DC converter; connect this pin to the HLDO_IN pin.(1) |
2 | DCDC_HGND | High-side Power Ground | High-side ground reference for the DC/DC converter; connect this pin to the HGND pin. |
3 | HLDO_IN | Power | Input of the high-side LDO; connect this pin to the DCDC_OUT pin.(1) |
4 | NC | — | No internal connection. Connect this pin to the high-side ground or leave unconnected (floating). |
5 | HLDO_OUT | Power | Output of the high-side LDO.(1) |
6 | INP | Analog Input | Noninverting analog input. Either INP or INN must have a DC current path to HGND to define the common-mode input voltage.(2) |
7 | INN | Analog Input | Inverting analog input. Either INP or INN must have a DC current path to HGND to define the common-mode input voltage.(2) |
8 | HGND | High-side Signal Ground | High-side analog signal ground; connect this pin to the DCDC_HGND pin. |
9 | GND | Low-side Signal Ground | Low-side analog signal ground; connect this pin to the DCDC_GND pin. |
10 | DOUT | Digital Output | Modulator data output. |
11 | CLKIN | Digital Input | Modulator clock input with internal pulldown resistor (typical value: 1.5 MΩ). |
12 | VDD | Low-side Power | Low-side power supply.(1) |
13 | LDO_OUT | Power | Output of the low-side LDO; connect this pin to the DCDC_IN pin. The output of the LDO must not be loaded by external circuitry.(1) |
14 | DIAG | Digital Output | Active-low, open-drain status indicator output; connect this pin to the pullup supply (for example, VDD) using a resistor or leave this pin floating if not used. |
15 | DCDC_GND | Low-side Power Ground | Low-side ground reference for the DC/DC converter; connect this pin to the GND pin. |
16 | DCDC_IN | Power | Low-side input of the DC/DC converter; connect this pin to the LDO_OUT pin.(1) |