ꢀ ꢁ ꢂꢃ ꢄ ꢅ ꢂ ꢆ
ꢇW ꢁꢈ ꢉꢀ ꢃ ꢊꢃ ꢋ ꢌ ꢍ ꢁ ꢎꢏ ꢀ ꢐꢑ
ꢅ
www.ti.com
SCDS174B − AUGUST 2004 – REVISED MAY 2005
V
IH
V
+
Logic
Input
OFF
ON
OFF
V
(V
I)
IL
R
GEN
NC or NO
NC or NO
COM
V
COM
+
V
COM
∆V
COM
V
GEN
(2)
C
L
V
= 0 to V
= 0
= 0.1 nF
GEN
+
V
I
IN
R
C
GEN
L
Logic
(1)
GND
Q = C ×∆V
V = V or V
I IH IL
C L COM
Input
(1)
(2)
All input pulses are supplied by generators having the following characteristics: PRR ≤ 10 MHz, Z = 50 Ω, t < 5 ns, t < 5 ns.
O
r
f
C
L
includes probe and jig capacitance.
Figure 20. Charge Injection (Q )
C
Channel ON: COM to NC
= V P-P
V
V /2
+
SOURCE
V = V or V
+
V
+
I
IH
IL
f
= 600 Hz to 20 kHz
SOURCE
R
L
10 mF
R
C
= 600 Ω
L
L
NC
= 50 pF
10 mF
Analyzer
V
O
COM
IN
(1)
C
L
NO
V
R
L
V
I
SOURCE
+
GND
(1)
C
L
includes probe and jig capacitance.
Figure 21. Total Harmonic Distortion (THD)
18
TI [ TEXAS INSTRUMENTS ]
