ADC1210S NXP Semiconductors, ADC1210S Datasheet - Page 16

• Manufacturer Part Number: ADC1210S
• Description: Single 12-bit ADC
• Manufacturer: NXP Semiconductors

NXP Semiconductors
ADC1210S_SER_1
Preliminary data sheet
11.3.1 Internal/external references
11.3 System reference and power management
The ADC1210S 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 pins VREF and
SENSE (programmable in 1 dB steps between 0 dB and −6 dB via control bits
INTREF[2:0] when bit INTREF_EN = 1; see
Figure 15
reference is also possible by providing a voltage on pin VREF as described in
If bit INTREF_EN is set to 0, the reference voltage will be determined either internally or
externally as detailed in
Table 12.
[1]
Selection
internal
(Figure
internal
(Figure
external
(Figure
internal via SPI
(Figure
Fig 12. Reference equivalent schematic
The voltage on pin VREF is doubled internally to generate the internal reference voltage.
SENSE
VREF
13)
14)
15)
16)
and
Reference selection
Figure
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SPI bit
INTREF_EN
0
0
0
1
BUFFER
SELECTION
16. The equivalent reference circuit is shown in
LOGIC
Rev. 01 — 9 April 2010
Table
12.
ADC1210S series; CMOS or LVDS DDR digital outputs
SENSE pin
AGND
pin VREF connected to pin SENSE and via
a 330 pF capacitor to AGND
V
pin VREF connected to pin SENSE and via
330 pF capacitor to AGND
DDA
REFERENCE
AMP
EXT_ref
EXT_ref
Table
VREF pin
330 pF capacitor to AGND
external voltage between
0.5 V and 1 V
REFERENCE
BANDGAP
22). See
ADC1210S series
[1]
Figure
ADC CORE
13,
Figure
REFT
REFB
Figure
© NXP B.V. 2010. All rights reserved.
full-scale (p-p)
2 V
1 V
1 V to 2 V
1 V to 2 V
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12. External
14,
Figure
16 of 36
15.