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ALD4211DC Datasheet(PDF) 4 Page - Advanced Linear Devices |
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ALD4211DC Datasheet(HTML) 4 Page - Advanced Linear Devices |
4 / 8 page ALD4211/ALD4212 Advanced Linear Devices 4 ALD4213 AC ELECTRICAL CHARACTERISTICS TA = 25°C V+ = +5.0V, V- = GND = 0.0V unless otherwise specified 4211/4212/4213 (PC) 4211/4212/4213 (DC) 4211/4212/4213 (SC) The ALD4211/ALD4212/ALD4213 feature very high precision due to these factors: 1. The analog switch has ultra low capacitive charge coupling so that the charge stored on a 200pF sampling capacitor is minimally affected. 2. With special charge balancing and charge cancellation circuitry designed on chip, the ALD4211/ALD4212/ ALD4213 achieves ultra low charge injection of typically only 0.2pC resulting in extremely low signal distortion to the external circuit. 3. The analog switch switching transistors have pA leakage currents minimizing the droop rate of the sampling circuit. 4. The internal switch timing allows for the analog switch to turn off internally without producing any residual transistor channel charge injection, which may affect external circuits. With a low loss polystyrene or polypropylene sampling capacitor, long data retention times are possible without significant signal loss. The ALD4211/ALD4212/ALD4213 CMOS analog switches, when used with industry standard pinout connection, have the input and output pins reversed with the signal source input connected to OUT pins and COM pins used as output pins. In this connection and when used with 1,000pF or greater value capacitors, or when connected to a DC current or resistive load, the switch would not be operating in an ultra low charge injection mode. Typical charge injection, in this case, would be 5pC as the pin to pin capacitive coupling effect would dominate. In this connection, all the other characteristics of the ALD4211/ALD4212/ALD4213 CMOS analog switches remain the same. Parameter Symbol Min Typ Max Min Typ Max Min Typ Max Unit Test Conditions Turn On Delay time tON 85 170 85 170 85 170 ns (Note 7) Turn Off Delay time tOFF 46 90 46 90 46 90 ns (Note 7) Break-Before-Make Delay Time tBD 15 40 15 40 15 40 ns Charge Injection QINJ 0.2 1.0 0.2 1.0 0.2 1.0 pC (Note 3) (Note 4) Off Isolation 75 75 75 dB At f = 100KHz, (Note 5) Crosstalk 90 90 90 dB At f = 100KHz, (Note 6) Total Harmonic THD 0.05 0.05 0.05 % RL = 10K Distortion 0.01 0.01 0.01 RL = 100K Com/Out COM(OFF) Off Capacitance OUT(OFF) 3.0 3.0 3.0 pF Channel On CDS (ON) 5.7 5.7 5.7 pF Capacitance Pin to Pin CPP 0.5 0.6 0.25 pF Capacitance |
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