ADC1610S125 Datasheet, PDF (14/33 Pages) NXP Semiconductors – Single 16-bit ADC 125 Msps CMOS or LVDS DDR digital outputs

NXP Semiconductors
ADC1610S125
Single 16-bit ADC 125 Msps
Table 12. Reference selection
Selection
SPI bit
INTREF_EN
internal
0
internal
0
external
0
internal via SPI 1
SENSE pin VREF pin
full scale (p-p)
AGND
330 pF capacitor to
AGND
pin VREF connected to pin SENSE and
via a 330 pF capacitor to AGND
V_DDA
external voltage between
0.5 V and 1 V^[1]
pin VREF connected to pin SENSE and
via 330 pF capacitor to AGND
2V
1V
1 V to 2 V
1 V to 2 V
[1] The voltage on pin VREF is doubled internally to generate the internal reference voltage.
Figure 10 to Figure 13 illustrate how to connect the SENSE and VREF pins to select the
required reference voltage source.
VREF
330 pF
REFT
SENSE
REFB
005aaa047
Fig 10. Internal reference, 2 V (p-p) full scale
330 pF
VREF
REFT
SENSE
REFB
005aaa048
Fig 11. Internal reference, 1 V (p-p) full scale
330 pF
VREF
SENSE
SPI SETTINGS
INTREF_EN = 1, active
INTREF = XXX
REFT
REFB
VREF
V
0.1 µF
SENSE
REFT
REFB
005aaa049
Fig 12. Internal reference via SPI, 1 V to 2 V (p-p)
full scale
VDDA
005aaa050
Fig 13. External reference, 1 V to 2 V (p-p) full scale
ADC1610S125_1
Objective data sheet
Rev. 01 — 28 May 2009
© NXP B.V. 2009. All rights reserved.
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