1-Bit, 20MHz, Second-Order, Isolated Delta-Sigma Modulator - AMC1204

AMC1204 (ACTIVE)

1-Bit, 20MHz, Second-Order, Isolated Delta-Sigma Modulator

Recommended alternative parts

  • ADS1204  - The device has SIMILAR FUNCTIONALITY but is not functionally equivalent to the compared device.   Similar device without integrated galvanic isolation
  • AMC1203  - The device has SIMILAR FUNCTIONALITY but is not functionally equivalent to the compared device.   Simiar device with lower sampling rate
  • ADS1203  - The device has SIMILAR FUNCTIONALITY but is not functionally equivalent to the compared device.   Similar device without integrated galvanic isolation and lower sampling rate

Description

The AMC1204 and AMC1204B are 1-bit digital output, isolated delta-sigma (ΔΣ) modulators that can be clocked at up to 20MHz. The digital isolation of the modulator output is provided by a silicon dioxide (SiO2) barrier that is highly resistant to magnetic interference. This barrier has been certified to provide basic galvanic isolation of up to 4000VPEAK (AMC1204) and 4250VPEAK (AMC1204B) according to UL1577, IEC60747-5-5, and CSA standards or specifications.

The AMC1204 and AMC1204B provide a single-chip solution for measuring the small signal of a shunt resistor across an isolated barrier. These types of resistors are typically used to sense currents in motor control inverters, green energy generation systems, and other industrial applications. The AMC1204 and AMC1204B differential inputs easily connect to the shunt resistor or other low-level signal sources. An internal reference eliminates the need for external components. When used with an appropriate external digital filter, an effective number of bits (ENOB) of 14 is achieved at a data rate of 78kSPS.

A 5V analog supply (AVDD) is used by the modulator while the isolated digital interface operates from a 3V, 3.3V, or 5V supply (DVDD). The AMC1204 and AMC1204B are available in SO-16 (DW) and SSO-8 (DWV) packages and are specified from –40°C to +105°C.

Features

  • ±250mV Input Voltage Range Optimized for Shunt Resistors
  • Certified Digital Isolation:
    • CSA, IEC60747-5-5, and UL1577 Approved
    • Isolation Voltage: 4250VPEAK (AMC1204B)
    • Working Voltage: 1200VPEAK
    • Transient Immunity: 15kV/µs
  • Long Isolation Barrier Lifetime
    (see Application Report SLLA197)
  • High Electromagnetic Field Immunity
    (see Application Note SLLA181A)
  • Outstanding AC Performance:
    • SNR: 84dB (min)
    • THD: –80dB (max)
  • Excellent DC Precision:
    • INL: ±8LSB (max)
    • Gain Error: ±2% (max)
  • External Clock Input for Easier Synchronization
  • Fully Specified Over the Extended Industrial Temperature Range

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Parametrics Compare all products in Isolated ADC

 
Resolution (Bits)
Sample Rate (max) (SPS)
# Input Channels
Input Range
Interface
Isolation (kV peak)
CMTI (Min) (kV/µs)
INL (Max) (+/-LSB)
SNR (dB)
THD (Max) (dB)
Power Consumption (Typ) (mW)
Architecture
Analog Voltage AV/DD (Min) (V)
Analog Voltage AV/DD (Max) (V)
Digital Supply (Min) (V)
Digital Supply (Max) (V)
Rating
Operating Temperature Range (C)
Pin/Package
Approx. Price (US$)
AMC1204 AMC1203
16     16    
78kSPS     40kSPS    
1     1    
±250mV     ±250mV    
Serial     Serial    
4.25     4    
15     15    
9     6    
84     85    
-80     -88    
88     80    
Delta-Sigma
Modulator    
Delta-Sigma
Modulator    
4.5     4.5    
5.5     5.5    
3     4.5    
5.5     5.5    
Catalog     Catalog    
-40 to 125     -40 to 105    
16SOIC
8SOIC    
16SOIC
8SOP    
3.45 | 1ku     3.35 | 1ku    

Other qualified versions of AMC1204

Version Part Number Definition
Automotive AMC1204-Q1 Q100 devices qualified for high-reliability automotive applications targeting zero defects

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Companion parts

Part # Name Product Family Comments
AMC1210   4 Channel Digital Filter for ADS120X family of modulators   ANALOG TO DIGITAL CONVERTER - ISOLATED ADC    Quad digital filter device for delta-sigma modulators.
See Literature sbaa144  Application note describing usage of AMC1210 with delta-sigma modulators in resolver based motor control applications.  
TPS7A3001   Vin -3V to -36V, -200mA, Ultra-Low Noise, High PSRR, Low-Dropout Linear Regulator   LINEAR REGULATOR (LDO) - SINGLE CHANNEL LDO    The negative-voltage TPS7A3001 LDO, when paired with the positive voltage TPS7A4901 LDO, provides designers with a total solution for powering precision analog applications. These LDOs feature ultra-high PSRR performance with output noise as low as 16 �Vrms and are designed to power noise-sensitive applications. Please look at ti.com/pmp5863.
See Literature slvt170  See Literature SLVT170, Power management for Precision Analog  
ADS1204   Four Delta-Sigma Modulators, 10MHz CLK, 0-5V Input, 16-Bit Resolution   ANALOG TO DIGITAL CONVERTER - PRECISION ADC (<=10MSPS)    The device has SIMILAR FUNCTIONALITY but is not functionally equivalent to the compared device. Similar device without integrated galvanic isolation  
TPS7A4901   Vin 3V to 36V, 150mA, Ultra-Low Noise, High PSRR, Low-Dropout Linear Regulator   LINEAR REGULATOR (LDO) - SINGLE CHANNEL LDO    The negative-voltage TPS7A3001 LDO, when paired with the positive voltage TPS7A4901 LDO, provides designers with a total solution for powering precision analog applications. These LDOs feature ultra-high PSRR performance with output noise as low as 16 �Vrms and are designed to power noise-sensitive applications. Please look at ti.com/pmp5863.
See Literature slvt170  See Literature SLVT170, Power management for Precision Analog  
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