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DAC2900-EVM 数据表(PDF) 11 Page - Burr-Brown (TI)

[Old version datasheet] Texas Instruments acquired Burr-Brown Corporation.
部件名 DAC2900-EVM
功能描述  Dual, 10-Bit, 125MSPS DIGITAL-TO-ANALOG CONVERTER
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制造商  BURR-BROWN [Burr-Brown (TI)]
网页  http://www.burr-brown.com
标志 BURR-BROWN - Burr-Brown (TI)

DAC2900-EVM 数据表(HTML) 11 Page - Burr-Brown (TI)

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DAC2900
11
SBAS166B
As shown in Figure 3, the transformer’s center tap is con-
nected to ground. This forces the voltage swing on IOUT and
IOUT to be centered at 0V. In this case the two resistors, RL,
may be replaced with one, RDIFF, or omitted altogether. This
approach should only be used if all components are close to
each other, and if the VSWR is not important. A complete
power transfer from the DAC output to the load can be
realized, but the output compliance range should be ob-
served. Alternatively, if the center tap is not connected, the
signal swing will be centered at RL • IOUTFS/2. However, in
this case, the two resistors, RL, must be used to enable the
necessary DC-current flow for both outputs.
The OPA680 is configured for a gain of two. Therefore,
operating the DAC2900 with a 20mA full-scale output will
produce a voltage output of ±1V. This requires the amplifier
to operate off of a dual power supply (±5V). The tolerance
of the resistors typically sets the limit for the achievable
common-mode rejection. An improvement can be obtained
by fine tuning resistor R4.
This configuration typically delivers a lower level of AC
performance than the previously discussed transformer solu-
tion because the amplifier introduces another source of
distortion. Suitable amplifiers should be selected based on
their slew-rate, harmonic distortion, and output swing capa-
bilities. High-speed amplifiers like the OPA680 or OPA687
may be considered. The AC performance of this circuit may
be improved by adding a small capacitor, CDIFF, between the
outputs IOUT and IOUT (as shown in Figure 4). This will
introduce a real pole to create a low-pass filter in order to
slew-limit the DAC’s fast output signal steps, which other-
wise could drive the amplifier into slew-limitations or into
an overload condition; both would cause excessive distor-
tion. The difference amplifier can easily be modified to add
a level shift for applications requiring the single-ended
output voltage to be unipolar, i.e., swing between 0V and
+2V.
DUAL TRANSIMPEDANCE OUTPUT CONFIGURATION
The circuit example of Figure 5 shows the signal output
currents connected into the summing junctions of the dual
voltage-feedback op amp OPA2680 that is set up as a
transimpedance stage, or ‘I-to-V converter’. With this cir-
cuit, the DAC’s output will be kept at a virtual ground,
minimizing the effects of output impedance variations, which
results in the best DC linearity (INL). As mentioned previ-
ously, care should be taken not to drive the amplifier into
slew-rate limitations, and produce unwanted distortion.
DIFFERENTIAL CONFIGURATION USING AN OP AMP
If the application requires a DC-coupled output, a difference
amplifier may be considered, as shown in Figure 4. Four
external resistors are needed to configure the voltage-feed-
back op amp OPA680 as a difference amplifier performing
the differential to single-ended conversion. Under the shown
configuration, the DAC2900 generates a differential output
signal of 0.5Vp-p at the load resistors, RL. The resistor
values shown were selected to result in a symmetric 25
loading for each of the current outputs since the input
impedance of the difference amplifier is in parallel to resis-
tors RL, and should be considered.
FIGURE 3. Differential Output Configuration Using an RF
Transformer.
FIGURE 5. Dual, Voltage-Feedback Amplifier OPA2680
Forms Differential Transimpedance Amplifier.
FIGURE 4. Difference Amplifier Provides Differential to
Single-Ended Conversion and DC-Coupling.
DAC2900
I
OUT
I
OUT
1:1
ADTT1-1
(Mini-Circuits)
R
L
50
R
L
50
R
S
Optional
R
DIFF
I
OUT
I
OUT
DAC2900
R
L
26.1
R
L
28.7
R
4
402
R
3
200
R
2
402
R
1
200
OPA680
C
OPT
+5V
V
OUT
–5V
1/2
OPA2680
1/2
OPA2680
DAC2900
–V
OUT = IOUT • RF1
–V
OUT = IOUT • RF2
R
F1
R
F2
C
F1
C
F2
C
D1
C
D2
I
OUT
I
OUT
50
50
–5V
+5V


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