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TS12A4514P bảng dữ liệu(PDF) 7 Page - Texas Instruments

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Giải thích chi tiết về linh kiện  LOW-VOLTAGE, LOW ON-STATE RESISTANCE SPST CMOS ANALOG SWITCHES
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APPLICATION INFORMATION
Power-Supply Considerations
Logic-Level Thresholds
High-Frequency Performance
Test Circuits/Timing Diagrams
TS12A4515
TS12A4514
GND
IN
NO
COM
50
TS12A4514
∆VOUT is the measured voltage due to charge
transfer error Q when the channel turns off.
Q = DVOUT x CL
TS12A4515
VIN
VOUT
VNO or VNC = 0 V
CL
1000 pF
VIN
VOUT
∆VOUT
V+
V+
V+
0 V
TS12A4514
,, TS12A4515
LOW-VOLTAGE, LOW ON-STATE RESISTANCE
SPST CMOS ANALOG SWITCHES
SCDS193B – AUGUST 2006 – REVISED MARCH 2007
The TS12A4514/TS12A4515 construction is typical of most CMOS analog switches, except that they have only
two supply pins: V+ and GND. V+ and GND drive the internal CMOS switches and set their analog voltage limits.
Reverse ESD-protection diodes are internally connected between each analog-signal pin and both V+ and GND.
One of these diodes conducts if any analog signal exceeds V+ or GND.
Virtually all the analog leakage current comes from the ESD diodes to V+ or GND. Although the ESD diodes on
a given signal pin are identical and, therefore, fairly well balanced, they are reverse biased differently. Each is
biased by either V+ or GND and the analog signal. This means their leakages will vary as the signal varies. The
difference in the two diode leakages to the V+ and GND pins constitutes the analog-signal-path leakage current.
All analog leakage current flows between each pin and one of the supply terminals, not to the other switch
terminal. This is why both sides of a given switch can show leakage currents of the same or opposite polarity.
There is no connection between the analog-signal paths and V+ or GND.
V+ and GND also power the internal logic and logic-level translators. The logic-level translators convert the logic
levels to switched V+ and GND signals to drive the analog signal gates.
The logic-level thresholds are CMOS/TTL compatible when V+ is 5 V. As V+ is raised, the level threshold
increases slightly. When V+ reaches 12 V, the level threshold is about 3 V – above the TTL-specified high-level
minimum of 2.8 V, but still compatible with CMOS outputs.
CAUTION:
Do not connect the TS12A4514/MAS4515 V+ to 3 V and then connect the
logic-level pins to logic-level signals that operate from 5-V supply. Output
levels can exceed 3 V and violate the absolute maximum ratings, damaging the
part and/or external circuits.
In 50-
Ω systems, signal response is reasonably flat up to 250 MHz (see Typical Operating Characteristics).
Above 20 MHz, the on response has several minor peaks that are highly layout dependent. The problem is not
in turning the switch on; it is turning it off. The OFF-state switch acts like a capacitor and passes higher
frequencies with less attenuation. At 10 MHz, OFF isolation is about –45 dB in 50-
Ω systems, decreasing
(approximately 20 dB per decade) as frequency increases. Higher circuit impedances also make OFF isolation
decrease. OFF isolation is about 3 dB above that of a bare IC socket, and is due entirely to capacitive coupling.
Figure 1. Charge Injection
7
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