Datasheet
SBAS312B − JANUARY 2005 − REVISED AUGUST 2007
www.ti.com
5
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
Digital Inputs
(7)
Logic family LVCMOS
V
IH
High-level input voltage BV
DD
= 3.6V 2 BV
DD
+0.3 V
V
IL
Low-level input voltage BV
DD
= 2.7V −0.3 0.8 V
I
IN
Input current V
I
= BV
DD
or GND ±50 nA
C
I
Input capacitance 5 pF
Digital Outputs
(7)
Logic family LVCMOS
V
OH
High-level output voltage BV
DD
= 2.7V, I
OH
= −100µA BV
DD
−0.2 V
V
OL
Low-level output voltage BV
DD
= 2.7V, I
OL
= +100µA 0.2 V
C
O
Output capacitance 5 pF
C
L
Load capacitance 30 pF
Data format Bit Stream
Power Supply
AV
DD
Analog supply voltage 4.5 5.5 V
BV
DD
Buffer I/O supply voltage
Low-voltage levels 2.7 3.6 V
BV
DD
Buffer I/O supply voltage
5V logic levels 4.5 5.5 V
AI
DD
Analog operating supply current
CLKSEL = 1 11.8 16 mA
AI
DD
Analog operating supply current
CLKSEL = 0 11.4 15.5 mA
BI
DD
Buffer I/O operating supply current
BV
DD
= 3V, CLKOUT = 10MHz 2 mA
BI
DD
Buffer I/O operating supply current
BV
DD
= 5V, CLKOUT = 10MHz 2 mA
Power dissipation
CLKSEL = 0 57 77.5 mW
Power dissipation
CLKSEL = 1 59 80 mW
(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.
EQUIVALENT INPUT CIRCUIT
R
ON
650
Ω
C
(SAMPLE)
1pF
BV
DD
D
IN
BGND
AV
DD
A
IN
AGND
Diode Turn−On Voltage: 0.35V
Equivalent Digital Input Circuit
Equivalent Analog Input Circuit