Datasheet

ADS8509
SLAS324C –OCTOBER 2004–REVISED APRIL 2010 www.ti.com
ELECTRICAL CHARACTERISTICS (continued)
At T
A
= –40°C to 85°C, f
s
= 250 kHz, V
DIG
= V
ANA
= 5 V, using internal reference and 0.1%, 0.25-W fixed resistors (see
Figure 29 and Figure 30) (unless otherwise specified)
ADS8509I ADS8509IB
PARAMETER TEST CONDITIONS UNIT
MIN TYP MAX MIN TYP MAX
REFERENCE
Internal reference voltage No load 2.48 2.5 2.52 2.48 2.5 2.52 V
Internal reference source current 1 1
mA
(must use external buffer)
Internal reference drift 8 8 ppm/°C
External reference voltage range 2.3 2.5 2.7 2.3 2.5 2.7
V
for specified linearity
External reference current drain Ext. 2.5-V ref. 100 100 mA
DIGITAL INPUTS
Logic levels
V
IL
Low-level input voltage –0.3 0.8 –0.3 0.8 V
V
IH
High-level input voltage 2.0 V
DIG
+0.3 V 2.0 V
DIG
+0.3 V V
I
IL
Low-level input current V
IL
= 0 V ±10 ±10 mA
I
IH
High-level input current V
IH
= 5 V ±10 ±10 mA
DIGITAL OUTPUTS
Data format (serial 16-bits)
Data coding (binary 2's
complement or straight binary)
Pipeline delay (conversion results
only available after completed
conversion)
Data clock (selectable for internal
or external data clock)
Internal clock (output only when EXT/INT Low 9 9 MHz
transmitting data)
External clock (can run EXT/INT High 0.1 26 0.1 26
continually but not recommended MHz
for optimum performance)
V
OL
Low-level output voltage I
SINK
= 1.6 mA 0.4 0.4 V
V
OH
High-level output voltage I
SOURCE
= 500 mA 4 4 V
Hi-Z State, ±5 ±5 mA
Leakage current
V
OUT
= 0 V to V
DIG
Output capacitance Hi-Z State 15 15 pF
POWER SUPPLIES
V
DIG
Digital input voltage 4.75 5 5.25 4.75 5 5.25 V
V
ANA
Analog input voltage 4.75 5 5.25 4.75 5 5.25 V
Must be ≤ V
ANA
I
DIG
Digital input current 4 4 mA
I
ANA
Analog input current 10 10 mA
POWER DISSIPATION
PWRD Low f
S
= 250 kHz 70 100 70 100 mW
PWRD High 50 50 mW
TEMPERATURE RANGE
Specified performance –40 85 –40 85 °C
Derated performance
(9)
–55 125 –55 125 °C
Storage –65 150 –65 150 °C
THERMAL RESISTANCE (q
JA
)
SSOP 62 62 °C/W
SO 46 46 °C/W
(9) The internal reference may not be started correctly beyond the industrial temperature range (–40°C to 85°C), therefore use of an
external reference is recommended.
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