adc1112d125 NXP Semiconductors, adc1112d125 Datasheet - Page 19

• Manufacturer Part Number: adc1112d125
• Description: Adc1112d125 Dual 11-bit Adc; Cmos Or Lvds Ddr Digital Outputs
• Manufacturer: NXP Semiconductors

NXP Semiconductors
ADC1112D125
Product data sheet
11.3.1 Internal/external references
11.3 System reference and power management
The ADC1112D125 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 = logic 1; see
The equivalent reference circuit is shown in
possible by providing a voltage on pin VREF as described in
Fig 19. Dual transformer configuration suitable for high intermediate frequency
application
Analog
input
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100 nF
100 nF
ADT1-1WT
Rev. 2 — 3 March 2011
Dual 11-bit ADC: CMOS or LVDS DDR digital outputs
100 nF
50 Ω
50 Ω
ADT1-1WT
Figure
Table
20. An external reference is also
50 Ω
50 Ω
23). See
12 Ω
12 Ω
ADC1112D125
Figure
Figure 21
23.
100 nF
8.2 pF
VCMA/VCMB
INAM/INBM
INAP/INBP
© NXP B.V. 2011. All rights reserved.
005aaa095
to
Figure
19 of 41
24.