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參數(shù)資料
| 型號： | AD9777 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 16-Bit, 160 MSPS 2X/4X/8X Interpolating Dual TxDAC+ D/A Converter |
| 中文描述： | 16位，160 MSPS的2X/4X/8X TxDAC系列插雙D / A轉(zhuǎn)換 |
| 文件頁數(shù)： | 29/48頁 |
| 文件大?。?/td> | 6021K |
| 代理商： | AD9777 |
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REV. 0
AD9777
–29–
f
OUT
(
f
DATA
)
0
1
A
–100
0
–80
–60
–40
–20
2
3
4
Figure 28a. 8
×
Interpolation, Modulation Disabled
f
OUT
(
f
DATA
)
0
1
A
–100
0
–80
–60
–40
–20
2
3
4
Figure 28b. 8
×
Interpolation, Modulation = f
DAC
/2
f
OUT
(
f
DATA
)
0
1
A
–100
0
–80
–60
–40
–20
2
3
4
5
6
7
8
Figure 28c. 8
×
Interpolation, Modulation = f
DAC
/4
f
OUT
(
f
DATA
)
0
1
A
–100
0
–80
–60
–40
–20
2
3
4
5
6
7
8
Figure 28d. 8
×
Interpolation, Modulation = f
DAC
/8
Figure 28. Effect of Digital Modulation on DAC Output Spectrum, Interpolation = 8
×
MODULATION, INTERPOLATION = 8
×
With Control Register 01h, Bits 7 and 6, set to “11,” the
interpolation rate of the AD9777 is 8
×
. Modulation is achieved
by multiplying successive samples at the interpolation filter
output by the sequence (0, 0.707, 1, 0.707, 0, –0.707, –1, 0.707).
Figures 28a–28d represent the spectral response of the AD9777
DAC output with 8
×
interpolation in the various modulation
modes to a narrow band baseband signal.
Looking at Figures 26 through 29, the user can see how higher
interpolation rates reduce the complexity of the reconstruction
filter needed at the DAC output. It also becomes apparent that
the ability to modulate by f
S
/2, f
S
/4, or f
S
/8 adds a degree of
flexibility in frequency planning.
ZERO STUFFING
(Control Register 01h, Bit 3)
As shown in Figure 29, a “0” or null in the output frequency
response of the DAC (after interpolation, modulation, and DAC
reconstruction) occurs at the final DAC sample rate (f
DAC
).
This is due to the inherent SIN(x)/x roll-off response in the digital-
to-analog conversion. In applications where the desired frequency
content is below f
DAC
/2, this may not be a problem. Note that at
f
DAC
/2 the loss due to SIN(x)/x is 4 dB. In direct RF applica-
tions, this roll-off may be problematic due to the increased
pass-band amplitude variation as well as the reduced amplitude
of the desired signal.
Consider an application where the digital data into the AD9777
represents a baseband signal around f
DAC
/4 with a pass band of
f
DAC
/10. The reconstructed signal out of the AD9777 would
experience only a 0.75 dB amplitude variation over its passband.
However, the image of the same signal occurring at 3
×
f
DAC
/4
will suffer from a pass-band flatness variation of 3.93 dB. This
image may be the desired signal in an IF application using one
of the various modulation modes in the AD9777. This roll-off
of image frequencies can be seen in Figures 25 through 28,
where the effect of the interpolation and modulation rate is
apparent as well.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD9777BSV | 制造商:Analog Devices 功能描述:DAC 2-CH R-2R 16-bit 80-Pin TQFP EP 制造商:Rochester Electronics LLC 功能描述:16BIT 160 MSPS DUAL TXDAC+ D/A CONVERTER - Bulk 制造商:Analog Devices 功能描述:Digital-Analog Converter IC Interface Ty |
| AD9777BSVRL | 制造商:Analog Devices 功能描述:DAC 2-CH R-2R 16-bit 80-Pin TQFP EP T/R |
| AD9777BSVZ | 功能描述:IC DAC 16BIT DUAL 160MSPS 80TQFP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)模轉(zhuǎn)換器 系列:TxDAC+® 標(biāo)準(zhǔn)包裝:1 系列:- 設(shè)置時間:4.5µs 位數(shù):12 數(shù)據(jù)接口:串行，SPI? 轉(zhuǎn)換器數(shù)目:1 電壓電源:單電源 功率耗散（最大）:- 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:8-SOICN 包裝:剪切帶 (CT) 輸出數(shù)目和類型:1 電壓，單極；1 電壓，雙極 采樣率（每秒）:* 其它名稱:MCP4921T-E/SNCTMCP4921T-E/SNRCTMCP4921T-E/SNRCT-ND |
| AD9777BSVZ | 制造商:Analog Devices 功能描述:IC 16-BIT DAC ((NW)) 制造商:Analog Devices 功能描述:IC, DAC, 16BIT, 400MSPS, TQFP-80 |
| AD9777BSVZ | 制造商:Analog Devices 功能描述:IC DAC 16BIT 400MSPS 80TQFP |
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