Datasheet

+
-
R
1
510:
R
G
160:
LMH6503
V
OUT
C
OUT
0.1µF
R
OUT
50:
R
F
1k:
3
2
7
6
1
12
14
11
9
8
10
13
C
1
0.1µF
R
2
510:
V
S
V
S
/2
V
G
+
-
+V
IN
-V
IN
R
1
510:
R
G
180:
R
3
2k:
LMH6503
R
4
2k:
V
OUT
C
OUT
0.1µF
R
OUT
50:
R
F
1k:
3
2
7
6
1
12
14
11
9
8
10
13
RANGE: ±1V FROM PIN 11
VOLTAGE (FOR V
S
= 10V)
V
G
C
1
0.1µF
R
2
510:
V
S
V
S
/2
LMH6503
SNOSA78E –OCTOBER 2003–REVISED APRIL 2013 www.ti.com
Figure 65. AC Coupled Single Supply VGA
Figure 66. Transformer Coupled Single Supply VGA
OPERATING AT LOWER SUPPLY VOLTAGES
The LMH6503 is rated for operation down to 5V supplies (V
+
- V
−
). There are some specifications shown for
operation at ±2.5V within the data sheet (i.e. Frequency Response, CMRR, PSRR, Gain vs. V
G
, etc.). Compared
to ±5V operation, at lower supplies:
a) V
G
range constricts. Referring to Figure 67, note that V
G_MAX
(V
G
voltage required to get maximum gain) is
0.5V (V
S
= ±2.5V) compared to 1.0V for V
S
= ±5V. At the same time, gain cut-off (V
G_MIN
) would shift to
−0.5V from - 1V with V
S
= ±5V.
Table 1 shows the approximate expressions for various V
G
voltages as a function of V
-
:
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