Datasheet

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ELECTRICAL CHARACTERISTICS: +V
CC
= +5V
ADS7822
SBAS062C – JANUARY 1996 – REVISED AUGUST 2007
At – 40 ° C to +85 ° C, +V
CC
= +5V, V
REF
= +5V, f
SAMPLE
= 200kHz, and f
CLK
= 16 × f
SAMPLE
, unless otherwise noted.
ADS7822 ADS7822B
PARAMETER TEST CONDITIONS UNIT
MIN TYP MAX MIN TYP MAX
ANALOG INPUT
Full-scale input span +In – ( – In) 0 V
REF
0 V
REF
V
+In – GND – 0.2 V
CC
+ 0.2 – 0.2 V
CC
+ 0.2 V
Absolute input range
– In – GND – 0.2 +1.0 – 0.2 +1.0 V
Capacitance 25 25 pF
Leakage current ± 1 ± 1 μ A
SYSTEM PERFORMANCE
Resolution 12 12 Bits
No missing codes 11 12 Bits
Integral linearity error – 2 +2 – 1 +1 LSB
(1)
Differential linearity error ± 0.8 – 1 ± 0.5 +1 LSB
Offset error – 3 +3 – 3 +3 LSB
Gain error – 4 +4 – 3 +3 LSB
Noise 33 33 μ Vrms
Power-supply rejection 70 70 dB
SAMPLING DYNAMICS
Conversion time 12 12 Clk Cycles
Acquisition time 1.5 1.5 Clk Cycles
Throughput rate 200 200 kHz
DYNAMIC CHARACTERISTICS
Total harmonic distortion V
IN
= 5V
PP
at 10kHz – 78 – 78 dB
SINAD V
IN
= 5V
PP
at 10kHz 71 71 dB
Spurious-free dynamic range V
IN
= 5V
PP
at 10kHz 79 79 dB
REFERENCE OUTPUT
Voltage range 0.05 V
CC
0.05 V
CC
V
CS = GND, f
SAMPLE
= 0Hz 5 5 G Ω
Resistance
CS = V
CC
5 5 G Ω
At code 710h 40 100 40 100 μ A
Current drain f
SAMPLE
= 12.5kHz 2.5 2.5 μ A
CS = V
CC
0.001 3 0.001 3 μ A
DIGITAL INPUT/OUTPUT
Logic family CMOS CMOS
V
IH
I
IH
= +5 μ A 3.0 5.5 3.0 5.5 V
V
IL
I
IL
= +5 μ A – 0.3 0.8 – 0.3 0.8 V
Logic levels
V
OH
I
OH
= – 250 μ A 3.5 3.5 V
V
OL
I
OL
= 250 μ A 0.4 0.4 V
Data format Straight Binary Straight Binary
POWER-SUPPLY REQUIREMENTS
V
CC
Specified performance 4.75 5.25 4.75 5.25 V
Quienscent current f
SAMPLE
= 200kHz 320 550 320 550 μ A
Power down CS = V
CC
3 3 μ A
TEMPERATURE RANGE
Specified performance – 40 +85 – 40 +85 ° C
(1) LSB means least significant bit. With V
REF
equal to +5V, one LSB is 1.22mV.
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