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VP101-3BADP Datasheet(PDF) 7 Page - Zarlink Semiconductor Inc |
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VP101-3BADP Datasheet(HTML) 7 Page - Zarlink Semiconductor Inc |
7 / 10 page VP101 6 APPLICATION NOTES RS-343A and RS-170 Video Generation For generation of RS-343A compatible video levels it is recommended that a doubly terminated 75 Ω load be used with an RSET resistor value of approximately 542Ω Similarly for generation of RS-170-compatible video, it is recommended that a singly terminated 75 Ω load be used with an RSET value of about 774Ω. If the VP101 is not driving a large capacitive load, there will be negligible difference in video quality between doubly terminated 75 Ω and singly terminated 75 Ω loads.t If driving a large capacitive load (load RC >1/20IIfc) it is recommended that an output buffer with unloaded gain >2 be used to drive a doubly terminated 75 Ω load. COMP Resistor To optimise the settling time of the VP101, a resistor may be added in series between the COMP capacitor and COMP pin. The series resistor damps inductive ringing on COMP, thus improving settling time. Non-Video Applications The VP101 may be used in non-video applications by disabling the video specific control inputs. REF WHITE should be a logic ‘0’ while BLANC and SYNC should be a logic ‘1’. ISYNC should be connected to VAA or AGND. All three outputs will have the same full scale output current. The relationship between RSET and full scale output current (IOUT) in this configuration is as follows: Iout (mA) = 7968 X −−−−−−− ≡ 255 LSBs Note that 1 LSB ≡ With the data inputs at $00, there is a DC offset current (Imin) defined as follows: Imin (mA) = 656 X −−−−−−− ≡ 21 LSBs Therefore the total full scale output current will be IOUT + Imin. The REF WHITE input may optionally be used as a ‘force to full scale’ control. Fig.4 Input/output timing VREF (V) RSET (Ω) VREF (V) RSET (Ω) VREF (V) 32 X RSET (Ω) TIMING WAVEFORMS NOTES 1. Output delay, tDLY, measured from the 50% point of the rising edge of CLOCK to the 50% point of full scale transition. 2. Settling time, ts, measured from the 50% point of full scale transition to the output remaining within ± 1 LSB. 3. Output rise/fall time, tVRF, measured between the 10% and 90% points of full scale transition. |
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