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參數(shù)資料
| 型號： | AD9731BR |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | DAC |
| 英文描述： | 10-Bit, 170 MSPS D/A Converter |
| 中文描述： | PARALLEL, WORD INPUT LOADING, 0.0038 us SETTLING TIME, 10-BIT DAC, PDSO28 |
| 封裝： | MS-013AE, SOIC-28 |
| 文件頁數(shù)： | 9/11頁 |
| 文件大小： | 149K |
| 代理商： | AD9731BR |
AD9731
–9–
REV. A
The REFERENCE IN pin can also be driven directly for wider
bandwidth multiplying operation. The analog signal for this mode
of operation must have a signal swing in the range of –3.3 V to
–4.25 V. This 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.
NOTE: 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
The switch network provides complementary current outputs
I
OUT
and I
OUTB
. The 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
OUTB
in pro-
portion to the digital input word. The sum of the two currents is
always equal to the full-scale output current minus 1 LSB. The
current can be converted to a voltage by resistive loading as
shown in the block diagram. Both I
OUT
and I
OUTB
should be
equally loaded for best overall performance. The 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. The 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
EVALUATION BOARD
The performance characteristics of the AD9731 make it ideally
suited for direct digital synthesis (DDS) and other waveform
synthesis applications. The AD9731 evaluation board provides a
platform for analyzing performance under optimum layout con-
ditions. The AD9731 also provides a reference for high speed
circuit board layout techniques.
相關PDF資料 |
PDF描述 |
|---|---|
| AD9731BRS | 10-Bit, 170 MSPS D/A Converter |
| AD9731-PCB | 10-Bit, 170 MSPS D/A Converter |
| AD9731 | 10-Bit, 170 MSPS D/A Converter(170MSPS,10位單片D/A轉換器) |
| AD9732 | 10-Bit, 200 MSPS D/A Converter |
| AD9732BRS | 10-Bit, 200 MSPS D/A Converter |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| AD9731BR-REEL | 制造商:Analog Devices 功能描述:DAC SGL CURRENT STEERING 10-BIT 28SOIC W - Tape and Reel |
| AD9731BRS | 制造商:Analog Devices 功能描述:DAC 1-CH Current Steering 10-bit 28-Pin SSOP 制造商:Analog Devices 功能描述:DAC SGL CURRENT STEERING 10-BIT 28SSOP - Rail/Tube 制造商:Rochester Electronics LLC 功能描述:10BIT 125MHZ DAC - Bulk |
| AD9731BRS-REEL | 制造商:Analog Devices 功能描述:DAC 1-CH Current Steering 10-bit 28-Pin SSOP T/R 制造商:Analog Devices 功能描述:DAC SGL CURRENT STEERING 10-BIT 28SSOP - Tape and Reel 制造商:Rochester Electronics LLC 功能描述:10BIT 125MHZ DAC - Tape and Reel |
| AD9731-PCB | 制造商:AD 制造商全稱:Analog Devices 功能描述:10-Bit, 170 MSPS D/A Converter |
| AD9732 | 制造商:AD 制造商全稱:Analog Devices 功能描述:10-Bit, 200 MSPS D/A Converter |
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