AD9222ABCPZRL7-50 Analog Devices Inc, AD9222ABCPZRL7-50 Datasheet - Page 32

• Manufacturer Part Number: AD9222ABCPZRL7-50
• Description: Octal 12 Bit, 50 MSPS Serial LVDS ADC
• Manufacturer: Analog Devices Inc

Specifications of AD9222ABCPZRL7-50

• Number Of Bits: 12
• Sampling Rate (per Second): 50M
• Data Interface: Serial, SPI™
• Number Of Converters: 8
• Power Dissipation (max): 760mW
• Voltage Supply Source: Analog and Digital
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 64-LFCSP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

AD9222
External Reference Operation
The use of an external reference may be necessary to enhance
the gain accuracy of the ADC or improve thermal drift charac-
teristics. Figure 82 shows the typical drift characteristics of the
internal reference in 1 V mode.
When the SENSE pin is tied to AVDD, the internal reference is
disabled, allowing the use of an external reference. The external
reference is loaded with an equivalent 6 kΩ load. An internal
reference buffer generates the positive and negative full-scale
references, REFT and REFB, for the ADC core. Therefore, the
external reference must be limited to a nominal of 1.0 V.
–10
–15
–20
–25
–30
–5
5
0
0
Figure 81. V
0.5
1.0
REF
Accuracy vs. Load, AD9222-50
CURRENT LOAD (mA)
1.5
2.0
2.5
3.0
3.5
Rev. D | Page 32 of 60
–0.02
–0.04
–0.06
–0.08
–0.10
–0.12
–0.14
–0.16
–0.18
0.02
0
–40
Figure 82. Typical V
–20
0
TEMPERATURE (°C)
REF
20
Drift, AD9222-50
40
60
80