Datasheet

TL05x, TL05xA
ENHANCED-JFET LOW-OFFSET
OPERATIONAL AMPLIFIERS
SLOS178A – FEBRUARY 1997 - REVISED FEBRUARY 2003
47
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
APPLICATION INFORMATION
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U1A
U3A
U3B
U3C
U3D
U1B
U1C
U1D
U2A
U2B
U2C
U2D
V
A
V
B
V
O
R1
20 kΩ
R8
20 kΩ
R2
10 kΩ
R9
10 kΩ
D1
D2
R3
30 kΩ
R10
30 kΩ
R4
10 kΩ
R5
10 kΩ
R6
10 kΩ
R7
10 kΩ
2N2484
Q1
Q2
R16
16.3 kΩ
R18
10 kΩ
R20
10 kΩ
R11
10 kΩ
R12
10 kΩ
R13
10 kΩ
2N2484
R14
10 kΩ
R76
16.3 kΩ
R19
10 kΩ
R21
10 kΩ
C1
15 V
–15 V
82 kΩ
1 kΩ
82 kΩ
NOTE A: U1A through U3D = TL05xA, V
CC±
= ±15 V. D1 and D2 = 1N914.
Figure 90. Voltage Ratio-to-dB Converter
0123456
– Output Voltage – V
78910
–2
–1
0
1
2
Ratio – V
A
/V
B
V
O
Figure 91. Output Voltage vs the Ratio of the Input Voltages for Voltage-to-dB Converter