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| LMH6503MAX Datasheet, PDF (22/33 Pages) Texas Instruments – LMH6503 Wideband, Low Power, Linear Variable Gain Amplifier | |||
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LMH6503
SNOSA78E â OCTOBER 2003 â REVISED APRIL 2013
www.ti.com
+VIN
-VIN
R2
510:
C1
0.1µF
VS
R1
510:
VS/2
RF
14
3
13
1
+
1k:
12
COUT
0.1µF
RG
180:
6
LMH6503
-
9
8 11
2
10
ROUT
50:
VOUT
R3
R4 7
2k:
2k:
VG
RANGE: ±1V FROM PIN 11
VOLTAGE (FOR VS = 10V)
Figure 65. AC Coupled Single Supply VGA
RG
160:
R2
510:
C1
0.1µF
VS
R1
510:
VS/2
14
3
13
+1
RF
1k:
12
LMH6503
6 - 8 11 9
7
10
2
COUT
0.1µF
ROUT VOUT
50:
VG
Figure 66. Transformer Coupled Single Supply VGA
OPERATING AT LOWER SUPPLY VOLTAGES
The LMH6503 is rated for operation down to 5V supplies (V+ - Vâ). There are some specifications shown for
operation at ±2.5V within the data sheet (i.e. Frequency Response, CMRR, PSRR, Gain vs. VG, etc.). Compared
to ±5V operation, at lower supplies:
a) VG range constricts. Referring to Figure 67, note that VG_MAX (VG voltage required to get maximum gain) is
0.5V (VS = ±2.5V) compared to 1.0V for VS = ±5V. At the same time, gain cut-off (VG_MIN) would shift to
â0.5V from - 1V with VS = ±5V.
Table 1 shows the approximate expressions for various VG voltages as a function of V-:
22
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