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參數(shù)資料
| 型號(hào)： | AD9731 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 10-Bit, 170 MSPS D/A Converter(170MSPS,10位單片D/A轉(zhuǎn)換器) |
| 中文描述： | 10位，170 MSPS的D / A轉(zhuǎn)換（170MSPS，10位單片的D / A轉(zhuǎn)換器） |
| 文件頁(yè)數(shù)： | 9/11頁(yè) |
| 文件大小： | 157K |
| 代理商： | AD9731 |
AD9731
–9–
REV. 0
T he REFERENCE IN pin can also be driven directly for wider
bandwidth multiplying operation. T he analog signal for this mode
of operation must have a signal swing in the range of –3.3 V to
–4.25 V. T his can be implemented by capacitively coupling into
REFERENCE IN a signal with a dc bias of –3.3 V (I
OUT
≈
22.5 mA) to –4.25 V (I
OUT
≈
3 mA), as shown in Figure 17, or
by dividing REFERENCE IN with a low impedance op amp
whose signal swing is limited to the stated range.
NOT E: When using an external reference, the external refer-
ence voltage must be applied prior to applying –V
S
.
REFERENCE IN
AD9731
–V
S
APPROX
–3.8V
–V
S
Figure 17. Wideband Multiplying Circuit
Analog Output
T he switch network provides complementary current outputs
I
OUT
and I
OUT B
. T he design of the AD9731 is based on statisti-
cal current source matching, which provides a 10-bit linearity
without trim. Current is steered to either I
OUT
or I
OUT B
in pro-
portion to the digital input word. T he sum of the two currents is
always equal to the full-scale output current minus 1 LSB. T he
current can be converted to a voltage by resistive loading as
shown in the block diagram. Both I
OUT
and I
OUT B
should be
equally loaded for best overall performance. T he voltage that is
developed is the product of the output current and the value of
the load resistor.
An operational amplifier can also be used to perform the I-to-V
conversion of the DAC output. Figure 18 shows an example of a
circuit that uses the AD9617, a high speed, current feedback
amplifier. T he resistor values in Figure 18 provide a 4.096 V
swing, centered at ground, at the output of the AD9617 amplifier.
AD9617
AD9731
R1
200
V
10k
V
1/2
AD708
10k
V
R2
100
V
R
FB
400
V
I
OUT
I
OUTB
CONTROL
AMP IN
REF
OUT
R
FF
25
V
R
L
25
V
1/2
AD708
±2048V
V
OUT
I
FS
I
FS
25
V
Figure 18. I-to-V Conversion Using a Current Feedback
Amplifier
E VALUAT ION BOARD
T he performance characteristics of the AD9731 make it ideally
suited for direct digital synthesis (DDS) and other waveform
synthesis applications. T he AD9731 evaluation board provides a
platform for analyzing performance under optimum layout con-
ditions. T he AD9731 also provides a reference for high speed
circuit board layout techniques.
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
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| AD9731BR | 制造商:Analog Devices 功能描述: |
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