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参数资料
| 型号： | AD9785-DPG2-EBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 32/64页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION FOR AD9785 |
| 标准包装： | 1 |
| 系列： | TxDAC® |
| DAC 的数量： | 2 |
| 位数： | 12 |
| 采样率（每秒）： | 800M |
| 数据接口： | 串行 |
| 设置时间： | 22ms |
| DAC 型： | 电流 |
| 工作温度： | -40°C ~ 85°C |
| 已供物品： | 板，缆线，CD |
| 已用 IC / 零件： | AD9785 |
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AD9785/AD9787/AD9788
Rev. A | Page 38 of 64
DIGITAL DATAPATH
The AD9785/AD9787/AD9788 digital datapath consists of
three 2× half-band interpolation filters, a quadrature modulator,
and an inverse sinc filter. A 32-bit NCO provides the sine and
cosine carrier signals required for the quadrature modulator.
INTERPOLATION FILTERS
The AD9785/AD9787/AD9788 contain three half-band filters
that can be bypassed. This allows the device to operate with 2×,
4×, or 8× interpolation rates, or without interpolation. The
interpolation filters have a linear phase response. The coefficients
of the low-pass filters are given in Table 28, Table 29, and
Table 30. Spectral plots for the filter responses are shown in
In 2×, 4×, or 8× interpolation mode, the usable bandwidth of
the interpolation filter is 80% of the complex input data rate.
The usable bandwidth has a pass-band ripple of less than
0.0005 dB and a stop-band attenuation of greater than 85 dB.
The center frequency of the interpolation filter is set by the
NCO frequency tuning word (Register 0x0A, Bits [31:0]), so
baseband input signals are always centered in the interpolation
filter pass band.
10
–100
–4
4
fOUT (× Input Data Rate)
AT
T
E
N
U
AT
IO
N
(
d
B
)
–3
–2
–1
0123
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
07
09
8-
0
10
Figure 55. 2× Interpolation, Low-Pass Response to ±4× Input Data Rate
(Dotted Lines Indicate 1 dB Roll-Off)
10
–100
–4
4
fOUT (× Input Data Rate)
A
T
E
NUA
T
IO
N
(
d
B)
–3
–2
–1
0123
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
07
09
8-
0
1
Figure 56. 4× Interpolation, Low-Pass Response to ±4× Input Data Rate
(Dotted Lines Indicate 1 dB Roll-Off)
10
–100
–4
4
fOUT (× Input Data Rate)
A
T
E
NUA
T
IO
N
(
d
B)
–3
–2
–1
0123
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
07
09
8-
01
2
Figure 57. 8× Interpolation, Low-Pass Response to ±4× Input Data Rate
(Dotted Lines Indicate 1 dB Roll-Off)
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD9785-EBZ | 制造商:Analog Devices 功能描述:Evaluation Board For AD9785 制造商:Analog Devices 功能描述:DUAL 12B, 1GSPS D-A CONVERTER - Bulk 制造商:Analog Devices 功能描述:Digital to Analog Eval. Board |
| AD9786 | 制造商:AD 制造商全称:Analog Devices 功能描述:16-Bit, 200 MSPS/500 MSPS TxDAC+ with 2】/4】/8】 Interpolation and Signal Processing |
| AD9786BSV | 制造商:Analog Devices 功能描述:DAC 1-CH Interpolation Filter 16-bit 80-Pin TQFP EP 制造商:Analog Devices 功能描述:IC 16BIT DAC SMD 9786 TQFP80 |
| AD9786BSVRL | 制造商:Analog Devices 功能描述:DAC 1-CH Interpolation Filter 16-bit 80-Pin TQFP EP T/R |
| AD9786BSVZ | 功能描述:IC DAC 16BIT INTERPOL/SP 80TQFP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 数模转换器 系列:TxDAC+® 标准包装:1 系列:- 设置时间:4.5µs 位数:12 数据接口:串行，SPI? 转换器数目:1 电压电源:单电源 功率耗散（最大）:- 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 供应商设备封装:8-SOICN 包装:剪切带 (CT) 输出数目和类型:1 电压，单极；1 电压，双极 采样率（每秒）:* 其它名称:MCP4921T-E/SNCTMCP4921T-E/SNRCTMCP4921T-E/SNRCT-ND |
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