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TS616 数据表(PDF) 23 Page - STMicroelectronics

部件名 TS616
功能描述  DUAL WIDE BAND OPERATIONAL AMPLIFIER WITH HIGH OUTPUT CURRENT
PDF  27 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

TS616 数据表(HTML) 23 Page - STMicroelectronics

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this bias current (30
µA max.) as the 1% of the cur-
rent through the resistance divider to keep a sta-
ble mid-supply, two resistances of 2.2k
Ω can be
used in the case of a 12V power supply and two
resistances of 820
Ω can be used in the case of a
5V power supply.
The input provides a high pass filter with a break
frequency below 10Hz which is necessary to re-
move the original 0 volt DC component of the input
signal, and to fix it at +VCC/2.
CHANNEL SEPARATION - CROSSTALK
The following figure shows the crosstalk from an
amplifier to a second amplifier. This phenomenon,
accentuated at high frequencies, is unavoidable
and intrinsic to the circuit.
Nevertheless, the PCB layout also has an effect
on the crosstalk level. Capacitive coupling be-
tween signal wires, distance between critical sig-
nal nodes and power supply bypassing are the
most significant factors.
Figure 65: Crosstalk vs. Frequency
AV=+4, Rfb=620Ω, VCC=±6V, Vout=2Vp
CHOICE OF THE FEEDBACK CIRCUIT
Table 1: Closed-Loop Gain - Feedback Compo-
nents
INVERTING AMPLIFIER BIASING
In this case a resistance R is necessary to achieve
good input biasing, see Figure 66.
This resistance is calculated by assuming the neg-
ative and positive input bias current. The aim is to
compensate for the offset bias current which could
affect the input offset voltage and the output DC
component. Assuming Ib-, Ib+, Rin, Rfb and a zero
volt output, the resistance R comes: R = Rin // Rfb .
Figure 66: Compensation of the Input Bias
Current
10k
100k
1M
10M
-130
-120
-110
-100
-90
-80
-70
-60
-50
Frequency (Hz)
V
CC (V)
Gain
R
fb (Ω)
±6
+1
750
+2
680
+4
620
+8
510
-1
680
-2
680
-4
620
-8
510
±2.5
+1
1.1k
+2
1k
+4
910
+8
680
-1
1k
-2
1k
-4
910
-8
680
R
Load
Output
Rfb
Rin
Ib-
Ib+
Vcc+
Vcc-
TS616
+
_
R
Load
Output
Rfb
Rin
Ib-
Ib+
Vcc+
Vcc-
TS616
+
_



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