ALD4212 Просмотр технического описания (PDF) - Advanced Linear Devices
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ALD4212 Datasheet PDF : 8 Pages
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AC ELECTRICAL CHARACTERISTICS
TA = 25°C V+ = +5.0V, V- = GND = 0.0V unless otherwise specified
Parameter
Turn On
Delay time
4211/4212/4213 (PC) 4211/4212/4213 (DC) 4211/4212/4213 (SC)
Symbol Min Typ Max Min Typ Max Min Typ Max Unit
tON
85 170
85 170
85 170 ns
Turn Off
Delay time
tOFF
46 90
46 90
46 90 ns
Break-Before-Make
Delay Time
Charge Injection
Off Isolation
Crosstalk
tBD
QINJ
15 40
15 40
15 40
ns
0.2 1.0
0.2 1.0
0.2 1.0 pC
75
75
75
dB
90
90
90
dB
Total Harmonic
THD
Distortion
0.05
0.01
0.05
0.05
%
0.01
0.01
Com/Out
COM(OFF)
Off Capacitance
OUT(OFF)
3.0
Channel On
Capacitance
CDS (ON)
5.7
3.0
3.0
pF
5.7
5.7
pF
Pin to Pin
CPP
0.5
Capacitance
0.6
0.25
pF
Test Conditions
(Note 7)
(Note 7)
(Note 3) (Note 4)
At f = 100KHz, (Note 5)
At f = 100KHz, (Note 6)
RL = 10K
RL = 100K
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.
ALD4211/ALD4212
Advanced Linear Devices
4
ALD4213
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