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參數(shù)資料
| 型號(hào)： | DAC250Y |
| 英文描述： | Dual, 12-Bit, 125MSPS DIGITAL-TO-ANALOG CONVERTER |
| 中文描述： | 雙通道，12位，125Msps數(shù)字模擬轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 14/17頁(yè) |
| 文件大小： | 389K |
| 代理商： | DAC250Y |
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DAC2902
SBAS167A
14
Using the internal reference, a 2k
resistor value results in
a full-scale output of approximately 20mA. Resistors with a
tolerance of 1% or better should be considered. Selecting
higher values, the output current can be adjusted from 20mA
down to 2mA. Operating the DAC2902 at lower than 20mA
output currents may be desirable for reasons of reducing the
total power consumption, optimizing the distortion perfor-
mance, or observing the output compliance voltage limita-
tions for a given load condition.
It is recommended to bypass the REF
IN
pin with a ceramic
chip capacitor of 0.1μF or more. The control amplifier is
internally compensated, and its small signal bandwidth is
approximately 0.3MHz.
GAIN SETTING OPTIONS
The full-scale output current on the DAC2902 can be set two
ways: either for each of the two DAC channels independently
or for both channels simultaneously. For the independent gain
set mode, the GSET pin (pin 42) must be LOW (i.e. connected
to AGND). In this mode, two external resistors are required
—
one R
SET
connected to the FSA1 pin (pin 44) and the other to
the FSA2 pin (pin 41). In this configuration, the user has the
flexibility to set and adjust the full-scale output current for each
DAC independently, allowing for the compensation of possible
gain mismatches elsewhere within the transmit signal path.
Alternatively, bringing the GSET pin HIGH (i.e. connected to
+V
A
), the DAC2902 will switch into the simultaneous gain set
mode. Now the full-scale output current of both DAC chan-
nels is determined by only one external R
SET
resistor con-
nected to the FSA1 pin. The resistor at the FSA2 pin may be
removed, however this is not required since this pin is not
functional in this mode and the resistor has no effect to the
gain equation. The formula for deriving the correct R
SET
remains unchanged, e.g. R
SET
= 2k
y
will result in a 20mA
output for both DACs.
EXTERNAL REFERENCE OPERATION
The internal reference can be disabled by simply applying an
external reference voltage into the REF
IN
pin, which in this
case functions as an input, as shown in Figure 11. The use
of an external reference may be considered for applications
that require higher accuracy and drift performance, or to add
the ability of dynamic gain control.
While a 0.1μF capacitor is recommended to be used with the
internal reference, it is optional for the external reference
operation. The reference input, REF
IN
, has a high input
impedance (1M
) and can easily be driven by various
sources. Note that the voltage range of the external reference
should stay within the compliance range of the reference
input (0.5V to 1.25V).
POWER-DOWN MODE
The DAC2902 features a power-down function that can be
used to reduce the total supply current to less than 6mA.
Applying a logic HIGH to the PD pin will initiate the power-
down mode, while a logic LOW enables normal operation.
When left unconnected, an internal active pull-down circuit
will enable the normal operation of the converter.
FIGURE 10. Internal Reference Configuration.
FIGURE 11. External Reference Configuration.
DAC2902
+1.25V Ref.
R
SET
2k
0.1
μ
F
FSA
+5V
+V
A
REF
IN
Current
Sources
I
REF
=V
REF
R
SET
Ref
Control
Amp
R
SET
External
Reference
I
REF
=V
REF
R
SET
DAC2902
+1.25V Ref.
FSA
+5V
+V
A
REF
IN
Current
Sources
Ref
Control
Amp
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| DAC2902 | Dual, 12-Bit, 125MSPS DIGITAL-TO-ANALOG CONVERTER |
| DAC2902-EVM | Dual, 12-Bit, 125MSPS DIGITAL-TO-ANALOG CONVERTER |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DAC2534-1 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC |
| DAC2534-2 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC |
| DAC259K59B WAF | 制造商:ON Semiconductor 功能描述: |
| DAC2800D | 制造商:MSK 制造商全稱:M.S. Kennedy Corporation 功能描述:6W DUAL DC - DC CONVERTERS |
| DAC2800S | 制造商:MSK 制造商全稱:M.S. Kennedy Corporation 功能描述:5.4W DC-DC CONVERTERS |
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