THS3215 Datasheet, PDF (50/71 Pages) Texas Instruments – THS3215 650-MHz, Differential to Single-Ended DAC Output Amplifier

THS3215
SBOS780A – MARCH 2016 – REVISED APRIL 2016
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Device Functional Modes (continued)
9.4.2 Dual-Output Mode
The D2S is also used to directly drive a doubly-terminated line, as shown in Figure 93. In addition, the OPS
amplifies the internal D2S output by 5 V/V. The internal path to the OPS is selected with PATHSEL (pin 4) at
ground, and the OPS gain is increased to 5 V/V. A 2-V_PP output at VO1 produces a 10-V_PP output at VOUT (pin
11). This 10-V_PP swing requires higher supply operation to provide sufficient headroom in the OPS output stage
in order to preserve signal integrity. A power supply of ±7.5 V provides adequate headroom.
49.9
Differential
V_IN
49.9
16
15
1
50 k
2 x1
50 k
x1
50
+
250
500
3 x1
14
100
4
13
18.5 k
39.2
12
158
49.9
11
AV = 10 V/V
To
50-Ÿ /RDG
10
18.5 k
9
5
6
7
8
AV = 2 V/V
To
50-Ÿ /RDG
49.9
Figure 93. Dual-Output Mode
A simple modification to the circuit in Figure 93 is to disable the OPS. The D2S output at VO1 can then be used
either directly or through a filter to an even higher power driver, such as the ±15-V THS3091.
50
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