dac1205d750 NXP Semiconductors, dac1205d750 Datasheet - Page 28

• Manufacturer Part Number: dac1205d750
• Description: Dac1205d750 Dual 12-bit Dac, Up To 750 Msps; 4? And 8? Interpolating
• Manufacturer: NXP Semiconductors

NXP Semiconductors
DAC1205D750
Product data sheet
10.10.1 Regulation
10.10 Full-scale current
10.9 DAC transfer function
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 DAC1205D750 operates with a binary input or a two’s complement
input.
Table 38 “DAC transfer function”
when I
Table 38.
The DAC1205D750 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.
The reference current is generated via an external resistor of 910 Ω (1 %) connected to
pin VIRES. A control amplifier sets the appropriate full-scale output current (I
DACs (see
Data
0
...
8192
...
16383
I
I
I
IOUTP
O fs
IOUTN
( )
=
O(fs)
=
=
I
I11 to I0 and Q11 to Q0
Binary
0000 0000 0000
...
1000 0000 0000
...
1111 1111 1111
IOUTP
I
DAC transfer function
I
= 20 mA.
O fs
Figure 11 “Internal reference
O fs
( )
( )
All information provided in this document is subject to legal disclaimers.
×
+
×
⎛
⎝
I
⎛
⎝
IOUTN
DATA
--------------- -
4095 DATA
--------------------------------- -
4095
Rev. 2 — 10 September 2010
4095
–
⎞
⎠
Dual 12-bit DAC, up to 750 Msps; 4× and 8× interpolating
⎞
⎠
Two’s complement
1000 0000 0000
...
0000 0000 0000
...
0111 1111 1111
shows the output current as a function of the input data,
configuration”).
Table 9 “Register allocation
DAC1205D750
IOUTP (mA)
0
...
10
...
20
© NXP B.V. 2010. All rights reserved.
IOUTN (mA)
20
...
10
...
0
O(fs)
) for both
map”)
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(3)
(4)
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