Application Information

The TPMC851 combines 32 single ended / 16 differential

channels of 16 bit multiplexed analog input, 8 channels of

16 bit analog output, 16 digital I/O lines and two 32 bit multipurpose

counters on a standard single-width PMC module.

A 16 bit ADC converts 32 single-ended or 16 differential

multiplexed ADC input channels. The conversion time is up

to 1.25μs without channel/gain change and up to 17.25 μs

with channel/gain change (ADC throughput rate up to

250ksps). The input multiplexer of the A/D circuit offers

analog overvoltage protection of up to 70Vpp. A

programmable gain amplifier allows gains of 1, 2, 4 or 8

resulting in input voltage ranges of ±10V, ±5V, ±2.5V or

±1.25V.

The ADC part of the TPMC851 can operate in Manual Mode

or Sequencer Mode:

 Manual Mode

In Manual Mode the multiplexer, programmable gain

amplifier and the converter are fully controlled by the

user. A conversion for a selected channel / gain can be

started automatically after the settling time has

elapsed, or manually by the user.

 Sequencer Mode

In Sequencer Mode each of the A/D channels can be

independently enabled and configured for the

sequencer. The sequencer can run continuously, at

specific time intervals, or it may be triggered by an

external event. Conversion data is buffered in a data

RAM.

The 8 analog output channels are provided by eight 16 bit

digital to analog converters (DACs). The conversion time is

10 μs. An operational amplifier drives the full-scale range of

±10V and is capable to drive high capacitive loads. Similar

to the analog inputs a sequencer can control the analog

outputs.

Following operation modes are available:

 Immediate Update: Updates the DAC output

immediately when new data is written to the DAC

channel.

 Simultaneous Update: DAC data is buffered and all

DAC outputs are updated simultaneously on a trigger

event:

 Manual Update: Updates all DAC outputs on a

manual event (register write)

 Trigger Update: Updates all DAC outputs on a

external event

 Sequencer Update: Updates all DAC outputs after

the sequencer timer has elapsed