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TLV1562 Datasheet(PDF) 9 Page - Texas Instruments |
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TLV1562 Datasheet(HTML) 9 Page - Texas Instruments |
9 / 40 page TLV1562 2.7 V TO 5.5 V, HIGH-SPEED LOW-POWER RECONFIGURABLE ANALOG-TO-DIGITAL CONVERTER WITH 4-INPUT, DUAL S/H, PARALLEL INTERFACE, AND POWER DOWN SLAS162 – SEPTEMBER 1998 9 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 detailed description (continued) equivalent input impedance VCC (V) Ron( Ω) 1 k 0.5 k 2.7 5.5 Vin Cpad = 10 pF 0 V Csample = 0.5 pF FB Rs Ron Ron Buffer Figure 4. Equivalent Input Circuit Figure 5. Input Mux On Resistance vs Analog Supply Voltage Req = Vin/Ieq = (Q/Cin)/(Q/T) = T/Cin = 1/(fs × Csample) = 1/(2 MHz × 0.5 pF) = 1 MΩ Where fs is the sampling frequency, and fc is the conversion frequency fs = fc/5 when the device is in one channel/continuous conversion mode, fs = fc/10 when the device is in one channel/continuous conversion mode, fs = Conversion trigger strobe frequency when the device is in interrupt mode (RD or CSTART) Csample = Input capacitance = 0.5 pF Cparasitic = Parasitic capacitance = 0.5 pF Cpad = Input PAD capacitance = 10 pF Ron = Mux switch on series resistance = 1 k Ω at 2.7 V Rs = Source output resistance = 1 k Ω input bandwidth (full power 0 dB input, BW at –1 dB) BW = 1/[2 × π × (Rtotal y Cac)] = 1/[2 × π × ((Ron + Rs) × (Csample + Cparasitic))] = 1/[2 × π × (2K × 1 pF)] = 79.6 MHz (Theoretical Max) –3 –4 –5 10 20 40 50 70 90 100 –2 –1 Analog Input Frequency – MHz 0 120 130 150 30 60 80 110 140 Figure 6. Typical Analog Input Frequency Input Bandwidth |
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