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| 型號： | DAC1205D750HW |
| 廠商： | NXP Semiconductors N.V. |
| 元件分類： | 外設及接口 |
| 英文描述： | Dual 12-bit DAC, up to 750 Msps; 2x 4x and 8x interpolating |
| 封裝： | DAC1205D750HW/C1<SOT638-1 (HTQFP100)|<<http://www.nxp.com/packages/SOT638-1.html<1<Always Pb-free,;DAC1205D750HW/C1<SOT638-1 (HTQFP100)|<<http://www.nxp.com/packages/SOT6 |
| 文件頁數(shù)： | 27/42頁 |
| 文件大小： | 352K |
| 代理商： | DAC1205D750HW |
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DAC1205D750
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 3 — 7 June 2011
27 of 42
NXP Semiconductors
DAC1205D750
Dual 12-bit DAC, up to 750 Msps; 4x and 8x interpolating
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.
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 function
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
interferers.
10.8 x / (sin x)
Due to the roll-off effect of the DAC, a selectable FIR filter is inserted to compensate for
the x / (sin x) effect. This filter introduces a DC loss of 3.4 dB. The coefficients are
represented in
Table 37
.
Table 37.
First interpolation filter
Lower
H(1)
H(2)
H(3)
H(4)
H(5)
f
NCO
M
--------------
f
s
2
32
=
f
NCO
M
--------------
f
s
2
=
Inversion filter coefficients
Upper
H(9)
H(8)
H(7)
H(6)
-
Value
2
4
10
35
401
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相關代理商/技術參數(shù) |
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|---|---|
| DAC1205D750HW/C1,5 | 功能描述:數(shù)模轉換器- DAC DL 12BIT DAC 750MSPS RoHS:否 制造商:Texas Instruments 轉換器數(shù)量:1 DAC 輸出端數(shù)量:1 轉換速率: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 |
| DAC1208 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:12-Bit, uP Compatible, Double-Buffered D to A Converters |
| DAC1208D650 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Dual 12-bit DAC; up to 650 Msps; 2×, 4× or 8× interpolating with JESD204A interface |
| DAC1208D650HN | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Dual 12-bit DAC; up to 650 Msps; 2×, 4× or 8× interpolating with JESD204A interface |
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