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| 型號： | DAC1617D1G0HN |
| 廠商： | NXP Semiconductors N.V. |
| 元件分類： | 外設及接口 |
| 英文描述： | Dual 16-bit DAC: up to 1 Gsps; x2, x4 and x8 interpolating |
| 封裝： | DAC1617D1G0HN/C1<SOT813-3 (HVQFN72)|<<http://www.nxp.com/packages/SOT813-3.html<1<Always Pb-free,;DAC1617D1G0HN/C1<SOT813-3 (HVQFN72)|<<http://www.nxp.com/packages/SOT813 |
| 文件頁數(shù)： | 29/66頁 |
| 文件大?。?/td> | 519K |
| 代理商： | DAC1617D1G0HN |
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DAC1617D1G0
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2011. All rights reserved.
Objective data sheet
Rev. 1.1 — 30 September 2011
29 of 66
NXP Semiconductors
DAC1617D1G0
Dual 16-bit DAC: up to 1 Gsps; x2, x4 and x8 interpolating
Table 18
shows the output current as a function of the input data, when
I
OA(fs)
= I
OB(fs)
= 20 mA.
Table 18.
Data
10.12 Full-scale current
10.12.1
Regulation
The DAC1617D1G0 reference circuitry integrates an internal band gap reference voltage
which delivers a 1.25 V reference on the GAPOUT pin. Decouple pin GAPOUT using a
100 nF capacitor.
The reference current is generated via an external resistor of 910
(1 %) connected to
VIRES. A control amplifier sets the appropriate full-scale current (I
OA(fs)
and I
OB(fs)
) for
both DACs (see
Figure 20
)).
Figure 20
shows the optimal configuration for temperature drift compensation because the
band gap reference voltage can be matched to the voltage across the feedback resistor.
The DAC current can also be adjusted by applying an external reference voltage to the
non-inverting input pin GAPOUT and by disabling the internal band gap reference voltage
(bit GAP_PON
of the COMMON register; see
Table 22
).
DAC transfer function
I15 to I0/Q15 to Q0
(binary coding)
I15 to I0/Q15 to Q0
(two’s complement
coding
1000 0000 0000 0000
...
0000 0000 0000 0000
...
0111 11111111 1111
IOUTAP/IOUTBP
IOUTAN/IOUTBN
0
...
32768
...
65535
0000 0000 0000 0000
...
1000 0000 0000 0000
...
1111 1111 1111 1111
0 mA
...
10 mA
...
20 mA
20 mA
....
10 mA
...
0 mA
Fig 20. Internal reference configuration
aaa-000259
910 Ω (1 %)
100 nF
DAC
CURRENT
SOURCES
ARRAY
BAND GAP
REFERENCE
GAPOUT
AGND
AGND
VIRES
DAC1617D
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