Datasheet

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ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
ADS8508
SLAS433 – SEPTEMBER 2005
PACKAGE/ORDERING INFORMATION
(1)
MINIMUM
NO MINIMUM SPECIFICATION
RELATIVE PACKAGE PACKAGE ORDERING TRANSPORT
PRODUCT MISSING SINAD TEMPERATURE
ACCURACY LEAD DESIGNATOR NUMBER MEDIA, QTY
CODE (dB) RANGE
(LSB)
ADS8508IBDW Tube, 25
ADS8508IB ±0.45 12 72 -40 °C to 85 °C SO-20 DW
ADS8508IBDWR Tape and Reel, 2000
(1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI
website at www.ti.com.
over operating free-air temperature range (unless otherwise noted)
(1)
ADS8508
R1
IN
±25 V
R2
IN
±25 V
Analog inputs R3
IN
±25 V
CAP +V
ANA
+ 0.3 V to AGND2 - 0.3 V
REF Indefinite short to AGND2, momentary short to V
ANA
DGND, AGND2 ±0.3 V
V
ANA
6 V
Ground voltage differences
V
DIG
to V
ANA
0.3 V
V
DIG
6 V
Digital inputs -0.3 V to +V
DIG
+ 0.3 V
Maximum junction temperature 165 °C
Storage temperature range –65°C to 150°C
Internal power dissipation 700 mW
Lead temperature (soldering, 10s) 260 °C
(1) All voltage values are with respect to network ground terminal.
At T
A
= -40 °C to 85 °C, f
s
= 250 kHz, V
DIG
= V
ANA
= 5 V, using internal reference and fixed resistors (See Figure 28 and
Figure 29 ) (unless otherwise specified)
ADS8508IB
PARAMETER TEST CONDITIONS UNIT
MIN TYP MAX
Resolution 12 Bits
ANALOG INPUT
Voltage ranges
(1)
Impedance
(1)
Capacitance 50 pF
THROUGHPUT SPEED
Conversion cycle Acquire and convert 4 µs
Throughput rate 250 kHz
DC ACCURACY
INL Integral linearity error -0.45 0.45 LSB
(2)
DNL Differential linearity error -0.45 0.45 LSB
No missing codes 12 Bits
Transition noise
(3)
0.1 LSB
(1) ±10 V, 0 V to 5 V, etc. (see Table 3 )
(2) LSB means least significant bit. For the ±10-V input range, one LSB is 4.88 mV.
(3) Typical rms noise at worst case transitions and temperatures.
2