HCPL 7850 PDF

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Notes: 1. This test mode is not intended for customer use. Exact offset value is dependent on layout of external bypass capacitors. Nonlinearity is defined as half of the peak-to-peak output deviation from the best-fit gain line, expressed as a percentage of the full-scale differential output voltage. CMRRIN is defined as the ratio of the gain for differential inputs applied between pins 2 and 3 to the gain for both common mode inputs applied to both pins 2 and 3 with respect to pin 4.

When the differential input signal exceeds approximately mV, the outputs will limit at the typical values shown.

Short-circuit current is the amount of output current generated when either output is shorted to VDD2 or ground. Agilent does not recommend operations under these conditions. CMR also known as IMR or Isolation Mode Rejection specifies the minimum rate of rise of a common mode signal applied across the isolation boundary at which small output perturbations begin to occur.

These output perturbations can occur with both the rising and falling edges of the common mode waveform and may be of either polarity. A CMR failure is defined as a perturbation exceeding mV at the output of the recommended application circuit Figure See Applications section for more information on CMR.

Output noise comes from two primary sources: chopper noise and sigma-delta quantization noise. Chopper noise results from chopper stabilization of the output op-amps.

It occurs at a specific frequency typically kHz and is not attenuated by the on-chip output filter. The on-chip filter does eliminate most, but not all, of the sigma-delta quantization noise. An external filter circuit may be easily added to the external post-amplifier to reduce the total RMS output noise.

See Applications section for more information. Device considered a two-terminal device: Pins 1, 2, 3, and 4 are shorted together and pins 5, 6, 7, and 8 are shorted together. Parameters are tested as part of device initial characterization and after design and process changes only. Parameters are guaranteed to limits specified for all lots not specifically tested.

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