Datasheet

REV. B
–3–
ADuC824
SPECIFICATIONS
1
Parameter ADuC824BS Test Conditions/Comments Unit
ADC SPECIFICATIONS
Conversion Rate 5.4 On Both Channels Hz min
105 Programmable in 0.732 ms Increments Hz max
Primary ADC
No Missing Codes
2
24 20 Hz Update Rate Bits min
Resolution 13 Range = ± 20 mV, 20 Hz Update Rate Bits p-p typ
18 Range = ±2.56 V, 20 Hz Update Rate Bits p-p typ
Output Noise See Tables IX and X Output Noise Varies with Selected
in ADC Description Update Rate and Gain Range
Integral Nonlinearity ± 15 ppm of FSR max
Offset Error
3
± 3 µV typ
Offset Error Drift ± 10 nV/°C typ
Full-Scale Error
4
± 10 µV typ
Gain Error Drift
5
± 0.5 ppm/°C typ
ADC Range Matching ± 2 AIN = 18 mV µV typ
Power Supply Rejection (PSR) 113 AIN = 7.8 mV, Range = ± 20 mV dBs typ
80 AIN = 1 V, Range = ± 2.56 V dBs min
Common-Mode DC Rejection
On AIN 95 At DC, AIN = 7.8 mV, Range = ±20 mV dBs min
On AIN 113 At DC, AIN = 1 V, Range = ± 2.56 V dBs typ
On REFIN 125 At DC, AIN = 1 V, Range = ± 2.56 V dBs typ
Common-Mode 50 Hz/60Hz Rejection
2
20 Hz Update Rate
On AIN 95 50 Hz/60 Hz ±1 Hz, AIN = 7.8 mV, dBs min
Range = ± 20 mV
90 50 Hz/60 Hz ±1 Hz, AIN = 1 V, dBs min
Range = ±2.56 V
On REFIN 90 50 Hz/60 Hz ± 1 Hz, AIN = 1 V, dBs min
Range = ±2.56 V
Normal Mode 50 Hz/60 Hz Rejection
2
On AIN 60 50 Hz/60 Hz ±1 Hz, 20 Hz Update Rate dBs min
On REFIN 60 50 Hz/60 Hz ± 1 Hz, 20 Hz Update Rate dBs min
Auxiliary ADC
No Missing Codes
2
16 Bits min
Resolution 16 Range = ± 2.5 V, 20 Hz Update Rate Bits p-p typ
Output Noise See Table XI Output Noise Varies with Selected
in ADC Description Update Rate
Integral Nonlinearity ± 15 ppm of FSR max
Offset Error
3
–2 LSB typ
Offset Error Drift 1 µV/°C typ
Full-Scale Error
6
–2.5 LSB typ
Gain Error Drift
5
± 0.5 ppm/°C typ
Power Supply Rejection (PSR) 80 AIN = 1 V, 20 Hz Update Rate dBs min
Normal Mode 50 Hz/60 Hz Rejection
2
On AIN 60 50 Hz/60 Hz ± 1 Hz dBs min
On REFIN 60 50 Hz/60 Hz ±1 Hz, 20 Hz Update Rate dBs min
DAC PERFORMANCE
DC Specifications
7
Resolution 12 Bits
Relative Accuracy ± 3 LSB typ
Differential Nonlinearity –1 Guaranteed 12-Bit Monotonic LSB max
Offset Error ± 50 mV max
Gain Error
8
± 1AV
DD
Range % max
± 1V
REF
Range % typ
AC Specifications
2, 7
Voltage Output Settling Time 15 Settling Time to 1 LSB of Final Value µs typ
Digital-to-Analog Glitch Energy 10 1 LSB Change at Major Carry nVs typ
(AV
DD
= 2.7 V to 3.6 V or 4.75 V to 5.25 V, DV
DD
= 2.7 V to 3.6 V or 4.75 V to 5.25 V, REFIN(+) = 2.5 V;
REFIN(–) = AGND; AGND = DGND = 0 V; XTAL1/XTAL2 = 32.768 kHz Crystal; all specifications T
MIN
to T
MAX
unless otherwise noted.)