dac1405d650 NXP Semiconductors, dac1405d650 Datasheet - Page 27

• Manufacturer Part Number: dac1405d650
• Description: Dual 14-bit Dac, Up To 650 Msps; 2? 4? And 8? Interpolating
• Manufacturer: NXP Semiconductors

NXP Semiconductors
DAC1405D650_1
Product data sheet
10.10.1 Regulation
10.10 Full-scale current
10.9 DAC transfer function
Table 34.
The full-scale output current for each DAC is the sum of the two complementary current
outputs:
The output current depends on the digital input data:
The setting applied to CODING (register 00h[2]; see
defines whether the DAC1405D650 operates with a binary input or a two’s complement
input.
Table 35 “DAC transfer function”
when I
Table 35.
The DAC1405D650 reference circuitry integrates an internal bandgap reference voltage
which delivers a 1.25 V reference to the GAPOUT pin. It is recommended to decouple pin
GAPOUT using a 100 nF capacitor.
I
I
I
First interpolation filter
Lower
H(1)
H(2)
H(3)
H(4)
H(5)
Data
0
...
8192
...
16383
O fs
IOUTP
IOUTN
=
O(fs)
=
=
I
I13/Q13 to I0/Q0
Binary
00 0000 0000 0000
...
10 0000 0000 0000
...
11 1111 1111 1111
IOUTP
I
I
Inversion filter coefficients
DAC transfer function
= 20 mA.
O fs
O fs
+
I
IOUTN
DATA
--------------- -
16383
16383 DATA
------------------------------------ -
16383
Rev. 01 — 4 May 2009
–
Dual 14-bit DAC, up to 650 Msps; 2 4 and 8 interpolating
Upper
H(9)
H(8)
H(7)
H(6)
-
Two’s complement
10 0000 0000 0000
...
00 0000 0000 0000
...
01 1111 1111 1111
shows the output current as a function of the input data,
Table 9 “Register allocation
DAC1405D650
Value
2
10
401
4
35
IOUTP
0 mA
...
10 mA
...
20 mA
© NXP B.V. 2009. All rights reserved.
IOUTN
20 mA
...
10 mA
...
0 mA
map”)
27 of 43
(3)
(4)
(5)