參數(shù)資料
型號: DAC1208D750HN
廠商: NXP SEMICONDUCTORS
元件分類: DAC
英文描述: Dual 12-bit DAC; up to 750 Msps; 2×, 4× or 8× interpolating
中文描述: SERIAL INPUT LOADING, 0.02 us SETTLING TIME, 12-BIT DAC, PQCC64
封裝: 9 X 9 MM, 0.85 MM HEIGHT, PLASTIC, SOT804-3, VQFN-64
文件頁數(shù): 31/98頁
文件大?。?/td> 554K
代理商: DAC1208D750HN
DAC1208D750
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2010. All rights reserved.
Product data sheet
Rev. 2 — 6 December 2010
31 of 98
NXP Semiconductors
DAC1208D750
2
×
, 4
×
or 8
×
interpolating DAC with JESD204A
(register 0Ch; see
Table 30 “DAC_B_CFG_1 register (address 0Ch) bit description”
and
register 0Eh; see
Table 32 “DAC_B_CFG_3 register (address 0Eh) bit description”
) define
the range of variation of the digital offset (see
Table 15
).
Table 15.
Default settings are shown highlighted.
DAC_OFFSET[11:0]
Decimal
2048
2047
...
1
0
+1
...
2046
2047
10.11 Analog output
The DAC1208D750 has two output channels each of which produces two complementary
current outputs. These allow the even-order harmonics and noise to be reduced. The pins
are IOUTAP/IOUTAN and IOUTBP/IOUTBN respectively and need to be connected via a
load resistor R
L
to the 3.3 V analog power supply (V
DDA(3V3)
).
The equivalent analog output circuit of one DAC is shown in
Figure 18
. This circuit
consists of a parallel combination of NMOS current sources, and their associated
switches, for each segment.
The cascode source configuration increases the output impedance of the source, thus
improving the dynamic performance of the DAC by introducing less distortion.
The device can provide an output level (V
o(p-p)
) of up to 2 V, depending on the application,
the following stages and the targeted performances.
Digital offset adjustment
Offset applied
Two’s complement
1000 0000 0000
1000 0000 0001
...
1111 1111 1111
0000 0000 0000
0000 0000 0001
...
0111 1111 1110
0111 1111 1111
4096
4094
...
2
0
+2
...
+4092
+4094
Fig 18. Equivalent analog output circuit (one DAC)
001aah019
V
DDA(3V3)
AGND
IOUTAP/IOUTBP
IOUTAN/IOUTBN
RL
RL
AGND
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DAC1208D750HN Dual 12-bit DAC; up to 750 Msps; 2×, 4× or 8× interpolating
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