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參數(shù)資料
| 型號： | AD9786BSVZRL |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 35/56頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC DAC 16BIT INTERPOL/SP 80TQFP |
| 產(chǎn)品培訓(xùn)模塊： | Data Converter Fundamentals DAC Architectures |
| 標(biāo)準(zhǔn)包裝： | 1,000 |
| 系列： | TxDAC+® |
| 位數(shù)： | 16 |
| 數(shù)據(jù)接口： | 并聯(lián) |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 電壓電源： | 單電源 |
| 功率耗散（最大）： | 1.25W |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 80-TQFP 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 80-TQFP-EP（12x12） |
| 包裝： | 帶卷 (TR) |
| 輸出數(shù)目和類型： | 2 電流，單極 |
| 采樣率（每秒）： | 500M |
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AD9786
Rev. B | Page 40 of 56
Figure 72 shows this effect at the DAC output for a signal
mirrored asymmetrically about dc that is produced by complex
modulation without a Hilbert transform. The signal bandwidth
was narrowed to show the aliased negative frequency
interpolation images.
In contrast, Figure 73 shows the same waveform with the
Hilbert transform applied. Clearly, the aliased interpolation
images are not present.
03152-073
0.5
–0.5
–0.4
–0.3
–0.2
–0.1
0
0.1
0.2
0.3
0.4
dBFS
–150
0
–50
–100
Figure 73. Effects of Hilbert Transform
If the output of the AD9786 is used with a quadrature modulator,
negative frequency images are cancelled without the need for
a Hilbert transform.
HILBERT TRANSFORM IMPLEMENTATION
The Hilbert transform on the AD9786 is implemented as a
19-coefficient FIR. The coefficients are given in Table 36.
Table 36.
Coefficient
Integer Value
H(1)
–6
H(2)
0
H(3)
–17
H(4)
0
H(5)
–40
H(6)
0
H(7)
–91
H(8)
0
H(9)
–318
H(10)
0
H(11)
+318
H(12)
0
H(13)
+91
H(14)
0
H(15)
+40
H(16)
0
H(17)
+17
H(18)
0
H(19)
+6
The transfer function of an ideal Hilbert transform has a +90°
phase shift for negative frequencies, and a –90° phase shift for
positive frequencies. Because of the discontinuities that occur at
0 Hz and at 0.5 × the sample rate, any real implementation of
the Hilbert transform trades off bandwidth vs. ripple.
Figure 74 and Figure 75 show the gain of the Hilbert transform
vs. frequency. Gain is essentially flat, with a pass-band ripple of
0.1 dB over the frequency range of 0.07 × the sample rate to
0.43 × the sample rate.
Figure 76 shows the phase response of the Hilbert transform
implemented in the AD9786. The phase response for positive
frequencies begins at –90° at 0 Hz, followed by a linear phase
response (pure time delay) equal to nine filter taps (nine
DACCLK cycles). For negative frequencies, the phase response
at 0 Hz is +90°, followed by a linear phase delay of nine filter
taps. To compensate for the unwanted 9-cycle delay, an equal
delay of nine taps is used in the AD9786 digital signal path
opposite the Hilbert transform. This delay block is shown as Δt
in the Functional Block Diagram (Figure 1).
03152-074
1000
100
200
300
400
500
600
700
800
900
–100
10
–20
–60
0
–40
–30
–70
–80
–90
–10
–50
Figure 74. Hilbert Transform Gain
03152-075
1000
100
200
300
400
500
600
700
800
900
–1.0
1.0
0.4
–0.4
0.8
0
0.2
–0.6
–0.8
0.6
–0.2
Figure 75. Hilbert Transform Ripple
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|---|---|
| AD9786-EB | 制造商:Rochester Electronics LLC 功能描述:EVAL BOARD FOR AD9786 - Bulk |
| AD9786-EBZ | 功能描述:BOARD EVALUATION FOR AD9786 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - 數(shù)模轉(zhuǎn)換器 (DAC) 系列:TxDAC+® 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- DAC 的數(shù)量:4 位數(shù):12 采樣率（每秒）:- 數(shù)據(jù)接口:串行，SPI? 設(shè)置時間:3µs DAC 型:電流/電壓 工作溫度:-40°C ~ 85°C 已供物品:板 已用 IC / 零件:MAX5581 |
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| AD9787 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Dual 12-/14-/16-Bit 800 MSPS DAC with Low Power 32-Bit Complex NCO |
| AD9787BSVZ | 功能描述:IC DAC 14BIT 800MSPS 100TQFP 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 |
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