1 Features

1• Delta-sigma modulator optimized for voltage and

temperature sensing:

– ±1-V input voltage range

– High differential input resistance: 1.6 GΩ (typ)

– Integrated 2.5-V, ±5-mA reference for

ratiometric measurement

• Excellent DC performance:

– Offset error: ±0.5 mV (max)

– Offset drift: ±6 μV/°C (max)

– Gain error: ±0.25% (max)

– Gain drift: ±45 ppm/°C (max)

– Ratiometric gain drift: ±15 ppm/°C (max)

• Selectable manchester encoded or uncoded

bitstream output

• Fully specified over the extended industrial

temperature range: –40°C to +125°C

2 Applications

• AC voltage and temperature sensing in industrial

applications:

– Motor drives

– Photovoltaic inverters

– Uninterruptible power supplies

– Industrial transport systems

3 Description

The AMC1035 is a precision delta-sigma (ΔΣ)

modulator that operates from a single 3.0-V to 5.5-V

supply and with an externally supplied clock signal in

the range of 9 MHz to 21 MHz. In Manchester mode,

the specified clock range is 9 MHz to 11 MHz. The

differential ±1-V input structure of the device is

optimized for high noise environments typical for

industrial applications.

Select the output bitstream of the AMC1035 to be

Manchester coded to prevent setup and hold time

requirement considerations of the receiving device

and reduce overall circuit layout efforts. When used

with a digital filter (such as integrated in the

TMS320F28004x, TMS320F2807x or TMS320F2837x

microcontroller families) to decimate the output

bitstream, the device can achieve 16 bits of resolution

with a dynamic range of 87 dB at a data rate of 82

kSPS.

The internal reference source of the AMC1035

supports ratiometric circuit architecture to minimize

the negative impact of the supply voltage variation

and temperature drift on the accuracy of the

measurement.

The AMC1035 can also be used for AC power line

voltage sensing with a digital isolator and isolated

power supply.