ADUC814BRU Analog Devices Inc, ADUC814BRU Datasheet - Page 15

• Manufacturer Part Number: ADUC814BRU
• Description: A/D Converter (A-D) IC
• Manufacturer: Analog Devices Inc
• Series: MicroConverter® ADuC8xxr

Specifications of ADUC814BRU

• Peak Reflow Compatible (260 C): No
• No. Of Bits: 12 Bit
• Leaded Process Compatible: No
• Mounting Type: Surface Mount
• No. Of Inputs: 6
• Features: +3V Or +5V Operation
• Package / Case: 28-TSSOP
• Rohs Status: RoHS non-compliant
• Core Processor: 8052
• Core Size: 8-Bit
• Speed: 16.78MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: POR, PSM, Temp Sensor, WDT
• Number Of I /o: 17
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 640 x 8
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 6x12b; D/A 2x12b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• For Use With: EVAL-ADUC814QSZ - KIT DEV FOR ADUC814 MICROCONVRTR
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Figure 13 and Figure 14 show typical FFT plots for the ADuC814.
These plots were generated using an external clock input via
P3.5 to achieve coherent sampling. The ADC is using its internal
reference (2.5 V) sampling a full-scale, 10 kHz sine wave test
tone input at a sampling rate of 149.79 kHz. The resultant FFTs
shown at 5 V and 3 V supplies illustrate an excellent 100 dB
noise floor, a 71 dB signal-to-noise ratio (SNR), and a THD
greater than −80 dB.
–100
–120
–140
–160
–100
–120
–140
–160
–20
–40
–60
–80
–20
–40
–60
–80
20
20
0
0
Figure 13. ADuC814 Dynamic Performance at V
Figure 14. ADuC814 Dynamic Performance at V
0
0
10
10
20
20
FREQUENCY (kHz)
FREQUENCY (kHz)
30
30
40
40
50
50
AV
f
f
SNR = 71.3dB
THD = –88.0dB
ENOB = 11.6
AV
f
f
SNR = 71.3dB
THD = –88.0dB
ENOB = 11.6
S
IN
S
IN
= 149.79kHz
= 149.79kHz
DD
= 9.910kHz
DD
= 9.910kHz
/DV
/DV
60
60
DD
DD
DD
DD
= 5 V
= 3 V
= 5V
= 3V
70
70
Rev. A | Page 15 of 72
Figure 15 and Figure 16 show typical dynamic performance
versus external reference voltages. Again excellent ac performance
can be observed in both plots with some roll-off being observed
as V
REF
80
75
70
65
60
55
50
80
75
70
65
60
55
50
falls below 1 V.
Figure 15. Typical Dynamic Performance vs. V
Figure 16. Typical Dynamic Performance vs. V
0.5
0.5
1.0
1.0
EXTERNAL REFERENCE (V)
EXTERNAL REFERENCE (V)
1.5
1.5
2.0
2.0
2.5
AV
f
2.5
S
AV
f
S
= 152kHz
DD
DD
= 152kHz
/DV
/DV
REF
REF
3.0
SNR
DD
THD
SNR
DD
5.0
, V
, V
THD
= 5V
DD
= 3V
DD
ADuC814
= 5 V
= 3 V
–70
–75
–80
–85
–90
–95
–100
–70
–80
–85
–75
–100
–90
–95