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| 型號： | DAC1008D750HN |
| 廠商： | NXP Semiconductors N.V. |
| 元件分類： | 外設及接口 |
| 英文描述： | Dual 10-bit DAC; up to 750 Msps; 2×, 4× or 8× interpolating |
| 封裝： | DAC1008D750HN/C1<SOT804-3|<<<1<Always Pb-free,;DAC1008D750HN/C1<SOT804-3|<<<1<Always Pb-free,; |
| 文件頁數(shù)： | 28/99頁 |
| 文件大?。?/td> | 547K |
| 代理商： | DAC1008D750HN |
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DAC1008D750
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 2 — 5 January 2011
28 of 99
NXP Semiconductors
DAC1008D750
2
×
, 4
×
or 8
×
interpolating DAC with JESD204A
10.6 Quadrature modulator and Numerically Controlled Oscillator (NCO)
The quadrature modulator allows the 10-bit I and Q data to be mixed with the carrier
signal generated by the NCO.
The frequency of the NCO is programmed over 32 bits and the sign of the sine component
can be inverted in order to operate positive or negative, lower or upper single sideband
up-conversion.
10.6.1
NCO in 32-bit
When using the NCO, the frequency can be set by the four registers FREQNCO_LSB,
FREQNCO_LISB, FREQNCO_UISB and FREQNCO_MSB over 32 bits.
The frequency for the NCO in 32-bit is calculated as follows:
(1)
where M is the decimal representation of FREQ_NCO[31:0].
The phase of the NCO can be set from 0
°
to 360
°
by both registers PHINCO_LSB and
PHINCO_MSB over 16 bits.
The default setting is f
NCO
= 96 MHz when f
s
= 640 Msps and the default phase is 0
°
.
10.6.2
Low-power NCO
When using the low-power NCO, the frequency can be set by the five MSBs of register
FREQNCO_MSB.
The frequency for the low-power NCO is calculated as follows:
(2)
where M is the decimal representation of FREQ_NCO[31:27].
The phase of the low-power NCO can be set by the five MSBs of the register
PHINCO_MSB.
10.6.3
Minus_3dB
During normal use, a full-scale pattern will also be full-scale at the output of the DAC.
Nevertheless, when the I and Q data are simultaneously close to full-scale, some clipping
can occur and the minus_3dB function can be used to reduce the gain in the modulator by
3 dB. This is to keep a full-scale range at the output of the DAC without added interferers.
10.7 x / (sin x)
The roll-off effect of the DAC causes a selectable FIR filter to be inserted to compensate
for the (sin x) / x effect. This filter introduces a DC loss of 3.4 dB. The coefficients are
represented in
Table 11
.
f
NCO
M
--------------
f
s
×
2
=
f
NCO
M
--------------
f
s
×
2
5
=
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DAC1008D750HN/C1,5 | 功能描述:數(shù)模轉(zhuǎn)換器- DAC DL 10BIT DAC 750MSPS 2X 4X OR 8X INT RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量:1 DAC 輸出端數(shù)量:1 轉(zhuǎn)換速率:2 MSPs 分辨率:16 bit 接口類型:QSPI, SPI, Serial (3-Wire, Microwire) 穩(wěn)定時間:1 us 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
| DAC1008LCN | 制造商:Texas Instruments 功能描述: |
| DAC1008LCN/A+ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:10-Bit Digital-to-Analog Converter |
| DAC100ACQ3 | 制造商:Analog Devices 功能描述: |
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