dac1628d1g25 NXP Semiconductors, dac1628d1g25 Datasheet - Page 26

• Manufacturer Part Number: dac1628d1g25
• Description: Dual 16-bit Dac Jesd204b Interface Up To 1.25 Gsps; X2, X4 And X8 Interpolating
• Manufacturer: NXP Semiconductors

NXP Semiconductors
DAC1628D1G25
Objective data sheet
10.10.1 Regulation
10.10 Full-scale current
The output current of DAC B depends on the digital input data and the gain factor defined
by bits DAC_B_DGAIN[11:0] of register DAC_B_DGAIN_LSB (see
It is possible to define if the DAC1628D1G25 operates with a binary input or a
two's complement input (bit CODING; see
Table 14
I
Table 14.
The DAC1628D1G25 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
both DACs (bits DAC_A_GAIN[9:0] (see
Figure 12
band gap reference voltage can be matched to the voltage across the feedback resistor.
I
I
Data
0
...
32768
...
65535
OA(fs)
IOUTBP
IOUTBN
Fig 12. Internal reference configuration
= I
OB(fs)
=
=
shows the output current as a function of the input data, when
I15 to I0/Q15 to Q0
(binary coding)
0000 0000 0000 0000
...
1000 0000 0000 0000
...
1111 1111 1111 1111
shows the optimal configuration for temperature drift compensation because the
DAC transfer function
I
I
OB fs
OB fs
= 20 mA.
 
 
All information provided in this document is subject to legal disclaimers.



----------------------------------------------- -


DAC_B_DGAIN
AGND
AGND
1
Rev. 1.1 — 10 October 2011
–

----------------------------------------------- -
DAC_B_DGAIN
1024
910 Ω (1 %)
100 nF
1024
I15 to I0/Q15 to Q0
(two’s complement
coding
1000 0000 0000 0000
...
0000 0000 0000 0000
...
0111 1111 1111 1111
Dual 16-bit DAC: JESD204B interface; up to 1.25 Gsps
GAPOUT


VIRES


Table
-------------------


DATA
65535
Table



-------------------

DATA
REFERENCE
65535
41).
BAND GAP
DAC1628D

18).



10 mA
20 mA


IOUTAP/IOUTBP
0 mA
...
...


DAC1628D1G25
SOURCES
CURRENT
aaa-000272
ARRAY
DAC
OA(fs)
Table
© NXP B.V. 2011. All rights reserved.
and I
IOUTAN/IOUTBN
20 mA
....
10 mA
...
0 mA
23).
OB(fs)
) for
26 of 133
(5)
(6)