Datasheet

ADS7924
www.ti.com SBAS482A –JANUARY 2010–REVISED MAY 2010
ELECTRICAL CHARACTERISTICS
Minimum/maximum specifications are at T
A
= –40°C to +85°C, 1.65V < DVDD < 5.5V, and 2.2V < AVDD < 5.5V. Typical
specifications are at T
A
= +25°C, AVDD = 5V, and DVDD = 5V, unless otherwise noted.
ADS7924
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
ANALOG INPUT
Full-scale input span (CHX – AGND) 0 AVDD V
Input capacitance
(1)
4 10 pF
ADC sampling capacitance 15 pF
MUX resistance 60 Ω
Input channel crosstalk 85 dB
SYSTEM PERFORMANCE
Resolution 12 Bits
No missing codes 12 Bits
Integral linearity –1.5 ±0.5 1.5 LSBs
Differential linearity –1.0 ±0.6 1.5 LSBs
Offset error –5 5 LSBs
Offset error drift 0.01 LSB/°C
Gain error –0.20 –0.01 0.20 %
Gain error drift 0.6 ppm/°C
Noise (rms) 0.125 LSB
SAMPLING DYNAMICS
Monitoring time/channel
(2)
10 µs
CLOCK
Internal clock frequency variation ±20 %
DIGITAL INPUT/OUTPUT
Logic family CMOS
Logic level:
V
IH
(SDA, SCL, A0, RESET) 0.8 DVDD DVDD + 0.3 V
V
IL
(SDA, SCL, A0, RESET) DGND – 0.3 0.4 V
Input current I
I
V
I
= DVDD or DGND –10 10 mA
I
OH
= 100mA, INT pin 0.8 DVDD DVDD V
V
OH
(PWRCON, INT)
I
OH
= 100µA, PWRCON pin 0.8 AVDD AVDD V
V
OL
(PWRCON, INT, SDA) I
OL
= 100mA DGND 0.4 V
Low-level output current I
OL
SDA pin, V
OL
= 0.6V 3 mA
Load capacitance C
B
SDA pin 400 pF
Data format Straight binary
POWER-SUPPLY REQUIREMENTS
Power-supply voltage:
DVDD
(3)
1.65 5.5 V
AVDD 2.2 5.5 V
I
AVDD
(4)
t
CYCLE
= 2.5ms, AVDD = 2.2V 5 8 mA
I
PWRD
, power-down current <1 mA
TEMPERATURE RANGE
Specified performance –40 +85 °C
(1) CH0 to CH3 input pin capacitance.
(2) Rate at which channels can be scanned. This is the minimum acquisition time (6µs) and conversion time (4µs).
(3) DVDD cannot exceed AVDD.
(4) See Figure 3 and Figure 4 for more information.
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