DAC1405D750_11 PHILIPS [NXP Semiconductors], DAC1405D750_11 Datasheet - Page 32

• Manufacturer Part Number: DAC1405D750_11
• Description: Dual 14-bit DAC, up to 750 Msps; 4x and 8x interpolating
• Manufacturer: PHILIPS [NXP Semiconductors]

NXP Semiconductors
DAC1405D750
Product data sheet
10.14.1 Basic output configuration
10.13 Auxiliary DACs
10.14 Output configuration
The DAC1405D750 integrates 2 auxiliary DACs that can be used to compensate for any
offset between the DAC and the next stage in the transmission path.
Both auxiliary DACs have a resolution of 10-bit and are current sources (referenced to
ground).
The output current depends on the auxiliary DAC data:
Table 42
Table 42.
Default settings are shown highlighted.
The use of a differentially-coupled transformer output provides optimum distortion
performance (see
electrical isolation.
Data
0
...
512
...
1023
AUXP
I
AUXN
Fig 13. 1 V
O AUX


=
=
=
shows the output current as a function of the auxiliary DAC data.
I
I
Auxiliary DAC transfer function
O AUX
I
O AUX
AUXP

o(p-p)

AUX[9:0] (binary)
00 0000 0000
...
10 0000 0000
...
11 1111 1111
All information provided in this document is subject to legal disclaimers.


+
differential output with transformer


Figure
I




AUXN
AUX 9:0
------------------------ -
(1023 A
-------------------------------------------- -
1023
Rev. 4 — 7 June 2011
13). In addition, it helps to match the impedance and provides

– UX 9:0
1023
IOUTnP/IOUTnN; V
IOUTnP
IOUTnN
Dual 14-bit DAC, up to 750 Msps; 4 and 8 interpolating




0 mA to 20 mA
0 mA to 20 mA
 


o(cm)
V
V
DDA(3V3)
DDA(3V3)
= 2.8 V; V
50 Ω
50 Ω
I
0
...
1.1
...
2.2
AUXP
2:1
o(dif)(p-p)
001aaj817
(mA)
50 Ω
= 1 V
DAC1405D750
I
2.2
...
1.1
...
0
AUXN
© NXP B.V. 2011. All rights reserved.
(mA)
32 of 42
(6)
(7)
(8)