ADUC836 Analog Devices, ADUC836 Datasheet - Page 22

• Manufacturer Part Number: ADUC836
• Description: Precision Analog Microcontroller: 1MIPS 8052 MCU + 62kB Flash + Dual 16-Bit ADC + 12-Bit DAC
• Manufacturer: Analog Devices

Specifications of ADUC836

• Mcu Core: 8052
• Mcu Speed (mips): 1
• Sram (bytes): 2304Bytes
• Gpio Pins: 34
• Adc # Channels: 4
• Other: PWM

PRIMARY AND AUXILIARY ADC NOISE PERFORMANCE
Tables X, XI, and XII show the output rms noise in mV and output
peak-to-peak resolution in bits (rounded to the nearest 0.5 LSB)
for some typical output update rates on both the primary and
auxiliary ADCs. The numbers are typical and are generated at a
differential input voltage of 0 V.The output update rate is selected
SF
Word
13
69
255
SF
Word
13
69
255
SF
Word
13
69
255
*Based on a six-sigma limit, the rms resolution is 2.7 bits greater than the peak-to-peak resolution.
SF
Word
13
69
255
*ADC converting in Bipolar mode
ADuC836
Typical Output RMS Noise vs. Update Rate*
Data Update
Rate (Hz)
105.3
19.79
5.35
Data Update
Rate (Hz)
105.3
19.79
5.35
Data Update
Rate (Hz)
105.3
19.79
5.35
Output RMS Noise in V
Peak-to-Peak Resolution vs. Input Range and Update Rate; Peak-to-Peak Resolution in Bits
Data
R
105.3
19.79
5.35
Typical Output RMS Noise vs. Input Range and Update Rate; Output RMS Noise in V
ate (Hz)
Typical RMS Resolution vs. Input Range and Update Rate: RMS Resolution in Bits*
Update
20 mV
1.50
0.60
0.35
20 mV
12
13.5
14
20 mV
14.7
16
16
Table X. Primary ADC, Typical Output RMS Noise (V)
Table XI. Primary ADC, Peak-to-Peak Resolution (Bits)
40 mV
1.50
0.65
0.35
40 mV
13
14
15
40 mV
15.7
16
16
Input Range
2.5 V
10.75
2.00
1.15
Table XII. Auxiliary ADC
80 mV
1.60
0.65
0.37
80 mV
14
15
16
80 mV
16
16
16
–22–
via the Sinc Filter (SF) SFR. It is important to note that the
peak-to-peak resolution figures represent the resolution for which
there will be no code flicker within a six-sigma limit.
The QuickStart Development system PC software comes com-
plete with an ADC noise evaluation tool. This tool can be easily
used with the evaluation board to see these figures from silicon.
Input Range
160 mV
1.75
0.65
0.37
Input Range
160 mV
15
16
16
Input Range
160 mV
16
16
16
SF
Word
13
69
255
NOTES
1
2
ADC converting in Bipolar mode
In Unipolar mode, peak-to-peak resolution at 105 Hz is 15 bits.
Peak-to-Peak Resolution vs. Update Rate
Peak-to-Peak Resolution in Bits
320 mV
3.50
0.65
0.37
320 mV
15
16
16
320 mV
16
16
16
Data Update
Rate (Hz)
105.3
19.79
5.35
640 mV
4.50
0.95
0.51
640 mV
15.5
16
16
640 mV
16
16
16
1.28 V
6.70
1.40
0.82
1.28 V
16
16
16
1.28 V
16
16
16
Input Range
2.5 V
16
16
16
2
1
2.56 V
11.75
2.30
1.25
2.56 V
16
16
16
2.56 V
16
16
16
REV. A