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GC5016-PBZ Datasheet(PDF) 5 Page - Texas Instruments |
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GC5016-PBZ Datasheet(HTML) 5 Page - Texas Instruments |
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5 / 88 page  GC5016 SLWS142G − JANUARY 2003 − REVISED NOVEMBER 2005 www.ti.com 5 9 POWER CONSUMPTION The maximum power consumption depends on the operating mode of the chip. The following equation estimates the typical power supply current for the chip. Chip-to-chip variation is typically ±5%. The AC Characteristics provides the production test limit for current in a maximum configuration. It is 10% over the typical value. Icore = (fCK/100 MHz) (Vcore/1.8 V) (Number_of_Active_Channels/4) (0.75 + FIRDutyCycle) 220 mA The FIRDutyCycle is calculated in the cmd5016 programming software. The ’.ANL’ extension of the user programming file contains the power analysis value.. It can be estimated by: Down Converter Mode: FIRDutyCycle = 1 for fCK/Fout ≤ 16 16 x Fout/fCK otherwise Up Converter Mode: FIRDutyCycle = 1 for fCK/Fin ≤ 32 32 x Fin/fCK otherwise Current consumption on the pad supply is primarily due to the external loads and follows C x V x F. Internal loads are estimated at 2 pF per pin. Data outputs transition from a zero to a one once per four clocks, while clock outputs transition every cycle. The frame strobes consume negligible power due to the low transition frequency. In general: Ipad = Σ DataPad/4 x C x F x V + Σ ClockPad x C x F x V Typically loads are 20 pF per pin. A worst case current would be all four output ports operating at 125 MHz and the four output clocks with [A−D]CK active at 125 MHz. Ipad = (64/4 + 4) x (C+2pF) x Fout x Vpad = 20 x 22 pF x 125 MHz x 3.3 V = 180 mA |
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