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| 型號： | DAC1405D650HW |
| 廠商： | NXP Semiconductors N.V. |
| 元件分類： | 外設(shè)及接口 |
| 英文描述： | Dual 14-bit DAC, up to 650 Msps; 2x 4x and 8x interpolating |
| 封裝： | DAC1405D650HW/C1<SOT638-1 (HTQFP100)|<<http://www.nxp.com/packages/SOT638-1.html<1<Always Pb-free,;DAC1405D650HW/C1<SOT638-1 (HTQFP100)|<<http://www.nxp.com/packages/SOT6 |
| 文件頁數(shù)： | 27/45頁 |
| 文件大?。?/td> | 1033K |
| 代理商： | DAC1405D650HW |
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DAC1405D650
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2010. All rights reserved.
Product data sheet
Rev. 3 — 10 September 2010
27 of 45
NXP Semiconductors
DAC1405D650
Dual 14-bit DAC, up to 650 Msps; 2
×
, 4
×
and 8
×
interpolating
10.7 Quadrature modulator and Numerically Controlled Oscillator (NCO)
The quadrature modulator allows the 14-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-bit and allows the sign of the sine
component to be inverted in order to operate positive or negative, lower or upper single
sideband up-conversion.
10.7.1
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
°
.
10.7.2
Low-power NCO
When using the low-power NCO, the frequency can be set by the 5 MSB 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 5 MSB of the register PHINCO_MSB.
10.7.3
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 by 3 dB in the
modulator. This is to keep a full-scale range at the output of the DAC without added
10.8 x / (sin x)
Due to the roll-off effect of the DAC, a selectable FIR filter is 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 34 “Inversion filter coefficients”
.
f
NCO
M
--------------
f
s
×
2
32
=
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 |
|---|---|
| DAC1405D650HW/C1,5 | 功能描述:數(shù)模轉(zhuǎn)換器- DAC IC DAC 14BIT 650MSPD DL 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 |
| DAC1405D650HW-C1 | 制造商:Integrated Device Technology Inc 功能描述:HTQFP100 - Bulk |
| DAC1405D650HW-C18 | 制造商:Integrated Device Technology Inc 功能描述:HTQFP100 - Tape and Reel |
| DAC1405D750 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Dual 14-bit DAC, up to 750 Msps; 4× and 8× interpolating |
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