DAC1408D650C1 NXP [NXP Semiconductors], DAC1408D650C1 Datasheet - Page 29

• Manufacturer Part Number: DAC1408D650C1
• Description: Dual 14-bit DAC up to 650 Msps 2, 4 or 8 interpolating
• Manufacturer: NXP [NXP Semiconductors]

NXP Semiconductors
DAC1408D650
Preliminary data sheet
10.9.1.1 External regulation
10.9.1 Regulation
10.9.2 Full scale current adjustment
10.9 Full scale current
The DAC1408D650 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 909 Ω (1 %) connected to
pin VIRES. A control amplifier sets the appropriate full scale current (I
(see
This configuration is optimum for temperature drift compensation because the bandgap
reference voltage can be matched to the voltage across the feedback resistor.
The DAC current can also be set by applying an external reference voltage to the
non-inverting input pin GAPOUT and disabling the internal bandgap reference voltage
with GAP_PD (register 00h[0]; see
description”).
The default full scale current (I
user to both DACs independently using the serial interface from 1.6 mA to 22 mA, ± 10 %.
The settings applied to DAC_A_GAIN_COARSE[3:0] (register 0Ah; see
“DAC_A_CFG_2 register (address 0Ah) bit description”
“DAC_A_CFG_3 register (address 0Bh) bit
(register 0Dh; see
register 0Eh; see
the coarse variation of the full scale current (see
Fig 18. Internal reference configuration
Figure
18).
DAC1408D; up to 650 Msps; 2×, 4× or 8× interpolating with JESD204A
All information provided in this document is subject to legal disclaimers.
Table 33 “DAC_B_CFG_3 register (address 0Eh) bit
Table 32 “DAC_B_CFG_2 register (address 0Dh) bit description”
Rev. 02 — 11 August 2010
AGND
AGND
O(fs)
100 nF
910 Ω
(1 %)
) is 20 mA but further adjustments can be made by the
Table 19 “COMMON register (address 00h) bit
GAPOUT
VIRES
description”) and DAC_B_GAIN COARSE[3:0]
BANDGAP
REF.
Table
14).
and register 0Bh; see
CURRENT
SOURCES
ARRAY
001aaj816
DAC
DAC1408D650
O(fs)
description”) define
© NXP B.V. 2010. All rights reserved.
Table 29
) for both DACs
Table 30
29 of 98
and