Datasheet

50W
+5V
50W
523W
OPA695
-5V
+5V
50W
511W
511W
OPA695
-5V
+5V
50W
453W
149W
OPA695
-5V
+5V
-5V
+5V
50W
402W
57.6W
OPA4872
OPA695
-5V
50W
To50 LoadW
Logic
IN0
IN1
IN2
IN3
A0 A1
523W
523W
SD
EN
G=1V/V
G=2V/V
G=4V/V
G=8V/V
OPA4872
www.ti.com SBOS346C –JUNE 2007–REVISED MARCH 2011
2-BIT HIGH-SPEED PGA When channel 0 is selected, the overall gain to the
matched load of the OPA4872 is 0dB. When channel
The OPA4872 can be used as a 2-bit, high-speed
1 is selected, this circuit delivers 6dB of gain to the
programmable gain amplifier (PGA) when used in
matched load. When channel 2 is selected, this circuit
conjunction with another amplifier. Figure 28 shows
delivers 12dB of gain to the matched load. When
one OPA695 used in series with each OPA4876 input
channel 3 is selected, this circuit delivers 18dB of
and configured with gains of +1V/V, +2V/V, +4V/V,
gain to the matched load.
and +8V/V, respectively.
Figure 28. 2-Bit, High-Speed PGA, Greater Than 300MHz Channel Bandwidth
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Product Folder Link(s): OPA4872