Datasheet HCPL-7800A, HCPL-7800 (Broadcom) - 8

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HCPL-7800A/HCPL-7800
Data Sheet Isolation Amplifer g. The maximum specified output supply current occurs when the differential input voltage (VIN+ – VIN–) = –200 mV, the maximum recommended operating input voltage. However, the output supply current will continue to rise for differential input voltages up to approximately –300 mV, beyond which the output supply current remains constant. h. Because of the switched-capacitor nature of the input sigma-delta converter, time-averaged values are shown. i. When the differential input signal exceeds approximately 308 mV, the outputs will limit at the typical values shown. j. Short circuit current is the amount of output current generated when either output is shorted to VDD2 or ground. k. CMRR is defined as the ratio of the differential signal gain (signal applied differentially between pins 2 and 3) to the common-mode gain (input pins tied together and the signal applied to both inputs at the same time), expressed in dB.
AC Electrical Specifications
Unless otherwise noted, all typicals and figures are at the nominal operating conditions of VIN+ = 0V, VIN– = 0V, VDD1 = VDD2 = 5V and TA = 25°C; all Min./Max. specifications are within the recommended operating conditions.
Parameter Symbol Min. Typ. Max. Units Test Conditions Figure Note
VOUT Bandwidth (–3 dB) BW 50 100 — kHz VIN+ = 200 mVpk-pk 13, 14 Sine Wave VOUT Noise NOUT — 31.5 — mVrms VIN+ = 0.0V a VIN to VOUT Signal Delay tPD10 — 2.03 3.3 µs VIN+ = 0 mV to 150-mV step. 15, 16 (50% to 10%) Measured at the output of MC34081 on Figure 16. VIN to VOUT Signal Delay tPD50 — 3.47 5.6 (50% to 50%) VIN to VOUT Signal Delay tPD90 — 4.99 9.9 (50% to 90%) VOUT Rise/ Fall Time tR/F — 2.96 6.6 (10% to 90%) Common-Mode Transient CMTI 10.0 15.0 — kV/µs VCM = 1 kV, TA = 25°C 17 b Immunity Power Supply Rejection PSR — 170 — mVrms With recommended c application circuit. a. 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 400 kHz at room temperature), and is not attenuated by the internal output filter. A filter circuit can be easily added to the external post-amplifier to reduce the total rms output noise. The internal output filter does eliminate most, but not all, of the sigma-delta quantization noise. The magnitude of the output quantization noise is very small at lower frequencies (below 10 kHz) and increases with increasing frequency. b. CMTI (Common-Mode Transient Immunity or CMR, Common-Mode Rejection) is tested by applying an exponentially rising/falling voltage step on pin 4 (GND1) with respect to pin 5 (GND2). The rise time of the test waveform is set to approximately 50 ns. The amplitude of the step is adjusted until the differential output (VOUT+ – VOUT-) exhibits more than a 200-mV deviation from the average output voltage for more than 1 µs. The HCPL-7800(A) will continue to function if more than 10 kV/µs common-mode slopes are applied, as long as the breakdown voltage limitations are observed. c. The data sheet value is the differential amplitude of the transient at the output of the HCPL-7800(A) when a 1 Vpk-pk, 1-MHz square wave with 40-ns rise and fall times is applied to both VDD1 and VDD2. Broadcom AV02-0410EN 8 Document Outline Description Features Applications Functional Diagram Ordering Information Package Outline Drawings Standard DIP Package Gull Wing Surface Mount Option 300 Solder Reflow Profile Regulatory Information IEC/EN/DIN EN 60747-5-5 Insulation Characteristics Insulation and Safety-Related Specifications Absolute Maximum Ratings Recommended Operating Conditions DC Electrical Specifications AC Electrical Specifications Package Characteristics Application Information Power Supplies and Bypassing PC Board Layout Current Sensing Resistors Sense Resistor Connections Output Side Frequently Asked Questions about the HCPL-7800(A) Basics Sense Resistor and Input Filter Isolation and Insulation Accuracy Power Supplies and Start-Up Miscellaneous