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.