Datasheet

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SBAS312B − JANUARY 2005 − REVISED AUGUST 2007
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4
ELECTRICAL CHARACTERISTICS (continued)
Over recommended operating free-air temperature range at −40°C to +85°C, AV
DD
= 5V, BV
DD
= 3V, CH x+ = 0.5V to 4.5V, CH x− = 2.5V,
REFIN = REFOUT = internal +2.5V, CLKIN = 20MHz, and 16-bit Sinc
3
filter with decimation by 256, unless otherwise noted.
PARAMETER
UNITS
ADS1205I
TEST CONDITIONS
PARAMETER
UNITS
MAXTYP
(1)
MIN
TEST CONDITIONS
Voltage Reference Output
V
REFOUT
Reference voltage output −40°C to +85°C 2.450 2.5 2.550 V
dV
REFOUT
/dT Output voltage temperature drift ±20 ppm/°C
Output voltage noise
f = 0.1Hz to 10Hz, C
L
= 10µF 10 µVrms
Output voltage noise
f =10Hz to 10kHz, C
L
= 10µF 12 µVrms
PSRR Power-supply rejection ratio 60 dB
I
OUT
Output current 10 µA
I
SC
Short-circuit current 0.5 mA
Turn-on settling time to 0.1% at C
L
= 0 100 µs
Voltage Reference Input
V
IN
Reference voltage input 0.5 2.5 2.6 V
Reference input resistance 100 MΩ
Reference input capacitance 5 pF
Reference input current 1 µA
Digital Inputs
(6)
Logic family CMOS with Schmitt Trigger
V
IH
High-level input voltage 0.7×BV
DD
BV
DD
+0.3 V
V
IL
Low-level input voltage −0.3 0.3×BV
DD
V
I
IN
Input current V
I
= BV
DD
or GND ±50 nA
C
I
Input capacitance 5 pF
Digital Outputs
(6)
Logic family CMOS
V
OH
High-level output voltage BV
DD
= 4.5V, I
OH
= −100µA 4.44 V
V
OL
Low-level output voltage BV
DD
= 4.5V, I
OL
= +100µA 0.5 V
C
O
Output capacitance 5 pF
C
L
Load capacitance 30 pF
Data format Bit Stream
(1)
All typical values are at T
A
= +25°C.
(2)
Integral nonlinearity is defined as the maximum deviation of the line through the end points of the specified input range of the transfer curve
for CH x+ = −2V to +2V at 2.5V, expressed either as the number of LSBs or as a percent of measured input range (4V).
(3)
Ensured by design.
(4)
Maximum values, including temperature drift, are ensured over the full specified temperature range.
(5)
With reduced accuracy, the clock frequency can go from 1MHz to 33MHz.
(6)
Applicable for 5.0V nominal supply: BV
DD
(min) = 4.5V and BV
DD
(max) = 5.5V.
(7)
Applicable for 3.0V nominal supply: BV
DD
(min) = 2.7V and BV
DD
(max) = 3.6V.