Reinforced Isolated Modulator With LDO Regulator, ±250mV Input, and CMOS Interface - AMC1304M25

AMC1304M25 (ACTIVE)

Reinforced Isolated Modulator With LDO Regulator, ±250mV Input, and CMOS Interface

 

Description

The AMC1304 is a precision, delta-sigma (ΔΣ) modulator with the output separated from the input circuitry by a capacitive double isolation barrier that is highly resistant to magnetic interference. This barrier is certified to provide reinforced isolation of up to 7000 VPEAK according to the DIN V VDE V 0884-10, UL1577 and CSA standards. Used in conjunction with isolated power supplies, the device prevents noise currents on a high common-mode voltage line from entering the local system ground and interfering with or damaging low voltage circuitry.

The input of the AMC1304 is optimized for direct connection to shunt resistors or other low voltage-level signal sources. The unique low input voltage range of the ±50-mV device allows significant reduction of the power dissipation through the shunt while supporting excellent ac and dc performance. By using an appropriate digital filter (that is, as integrated on the TMS320F2807x or TMS320F2837x families) to decimate the bit stream, the device can achieve 16 bits of resolution with a dynamic range of 81 dB (13.2 ENOB) at a data rate of 78 kSPS.

On the high-side, the modulator is supplied by an integrated low-dropout (LDO) regulator that allows an unregulated input voltage between 4 V and 18 V (LDOIN). The isolated digital interface operates from a 3.3-V or 5-V power supply (DVDD).

The AMC1304 is available in a wide-body SOIC-16 (DW) package and is specified from –40°C to 125°C.

Features

  • Pin-Compatible Family Optimized for Shunt-Resistor-Based Current Measurements:
    • ±50-mV or ±250-mV Input Voltage Ranges
    • CMOS or LVDS Digital Interface Options
  • Excellent DC Performance Supporting High-Precision Sensing on System Level:
    • Offset Error: ±50 µV or ±100 µV (max)
    • Offset Drift: 1.3 µV/°C (max)
    • Gain Error: ±0.2% or ±0.3% (max)
    • Gain Drift: ±40 ppm/°C (max)
  • Safety-Related Certifications:
    • 7000-VPK Reinforced Isolation per DIN V VDE V 0884-10 (VDE V 0884-10): 2006-12
    • 5000-VRMS Isolation for 1 Miinute per UL1577
    • CAN/CSA No. 5A-Component Acceptance Service Notice, IEC 60950-1: 2005, and IEC60065: 2014 End Equipment Standards
  • Transient Immunity: 15 kV/µs (min)
  • High Electromagnetic Field Immunity
    (see Application Note SLLA181A)
  • External 5-MHz to 20-MHz Clock Input for
    Easier System-Level Synchronization
  • On-Chip 18-V LDO Regulator
  • Fully Specified Over the Extended Industrial Temperature Range

View more

Parametrics Compare all products in Isolated ADCs

 
Resolution (Bits)
Sample Rate (max) (SPS)
# Input Channels
Input Range (Vp-p)
Interface
Isolation (kV peak)
CMTI (Min) (kV/µs)
INL (Max) (+/-LSB)
SNR (dB)
THD (Max) (dB)
Power Consumption (Typ) (mW)
Architecture
Analog Voltage AVDD (Min) (V)
Analog Voltage AVDD (Max) (V)
Digital Supply (Min) (V)
Digital Supply (Max) (V)
Rating
Operating Temperature Range (C)
Pin/Package
AMC1304M25
16   
20MSPS   
1   
250mV   
Serial
CMOS   
7   
15   
4   
85   
-80   
58.9   
Delta-Sigma   
4   
18   
3   
5.5   
Catalog   
-40 to 125   
16SOIC   

Other qualified versions of AMC1304M25

Version Part Number Definition
Automotive AMC1304M25-Q1 Q100 devices qualified for high-reliability automotive applications targeting zero defects