ADC1213D080HN/C1 NXP [NXP Semiconductors], ADC1213D080HN/C1 Datasheet - Page 16

• Manufacturer Part Number: ADC1213D080HN/C1
• Description: Dual 12-bit ADC; 65 Msps, 80 Msps, 105 Msps or 125 Msps
• Manufacturer: NXP [NXP Semiconductors]

NXP Semiconductors
ADC1213D_SER_5
Preliminary data sheet
14.2.1 Internal/external reference
14.2 System reference and power management
The ADC1213D has a stable and accurate built-in internal reference voltage to adjust the
ADC full-scale. This reference voltage can be set internally via SPI or with pin VREF an
SENSE (see
and −6 dB, via SPI control bits INTREF[2:0] (when bit INTREF_EN = 1; see
The equivalent reference circuit is shown in
by providing a voltage on pin VREF as described in
Table 10
Table 10.
Figure 11
Mode
Internal
Internal
External
Internal, SPI mode
(Figure
Fig 10. Reference equivalent schematic
SENSE
VREF
14)
(Figure
(Figure
(Figure
shows how to choose between the different internal/external modes:
to
Reference modes
Figure 14
Figure
11)
12)
13)
All information provided in this document is subject to legal disclaimers.
BUFFER
SELECTION
11,
SPI bit, “Internal
reference”
0
0
0
1
LOGIC
indicate how to connect the SENSE and VREF pins.
Rev. 05 — 23 April 2010
Figure
12,
REFERENCE
Figure 13
AMP
EXT_ref
EXT_ref
SENSE pin
GND
VREF pin = SENSE pin and
330 pF capacitor to GND
V
VREF pin = SENSE pin and
330 pF capacitor to GND
DDA
Figure
and
REFERENCE
BANDGAP
Figure
10. External reference is also possible
Figure
ADC1213D series
VREF pin
330 pF capacitor
to GND
External voltage
from 0.5 V to 1 V
14), in 1 dB steps between 0 dB
13.
ADC CORE
REFT
REFB
ADC1213D series
© NXP B.V. 2010. All rights reserved.
Full Scale,
V (p-p)
2
1
1 to 2
1 to 2
Table
21).
16 of 41