DAC1405D750_11 PHILIPS [NXP Semiconductors], DAC1405D750_11 Datasheet - Page 35

• 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
10.14.3 AC interface to an Analog Quadrature Modulator (AQM)
The constraints to adjust the interface are the output compliance range of the DAC and
the auxiliary DACs, the input common-mode level of the AQM, and the range of offset
correction.
When the AQM common-mode voltage is close to ground, the DAC1405D750 must be
AC-coupled and the auxiliary DACs are needed for offset correction.
Figure 19
common-mode input level using auxiliary DACs.
Fig 18. An example of a DC interface to a 3.3 V
Fig 19. An example of an AC interface to a 0.5 V
provides an example of a connection to an AQM with a 0.5 V
IOUTnN
IOUTnN
IOUTnP
IOUTnP
AUXnN
AUXnN
AUXnP
AUXnP
All information provided in this document is subject to legal disclaimers.
(1)
(1)
(1)
(2)
(1)
(2)
0 mA to 20 mA
1.1 mA (typ.)
IOUTnP/IOUTnN; V
BBP/BBN; V
IOUTnP/IOUTnN; V
BBP/BBN; V
V
Rev. 4 — 7 June 2011
54.9 Ω
634 Ω
442 Ω
66.5 Ω
DDA(3V3)
3.3 V
Dual 14-bit DAC, up to 750 Msps; 4 and 8 interpolating
i(cm)
i(cm)
54.9 Ω
634 Ω
442 Ω
66.5 Ω
= 3.3 V; V
= 0.5 V; V
o(cm)
o(cm)
237 Ω
237 Ω
10 nF
10 nF
= 2.75 V; V
= 2.65 V; V
i(dif)(p-p)
i(dif)(p-p)
750 Ω
2 kΩ
174 Ω
34 Ω
= 1.5 V; offset correction up to 36 mV
= 1.96 V; offset correction up to 70 mV
o(dif)(p-p)
o(dif)(p-p)
I(cm)
5 V
5 V
I(cm)
AQM using auxiliary DACs
AQM using auxiliary DACs
750 Ω
2 kΩ
= 1.96 V
174 Ω
34 Ω
= 1.96 V
DAC1405D750
BBP
BBN
BBP
BBN
AQM (V
AQM (V
(2)
(2)
i(cm)
i(cm)
001aaj589
001aaj544
= 3.3 V)
= 0.5 V)
I(cm)
© NXP B.V. 2011. All rights reserved.
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