ADS8508_14 Datasheet, PDF (2/28 Pages) Texas Instruments – 12-BIT 250-KSPS SERIAL CMOS SAMPLING ANALOG-TO-DIGITAL CONVERTER

ADS8508
SLAS433 – SEPTEMBER 2005
PACKAGE/ORDERING INFORMATION⁽¹⁾
www.ti.com
PRODUCT
MINIMUM
RELATIVE
ACCURACY
(LSB)
NO
MISSING
CODE
ADS8508IB
±0.45
12
MINIMUM
SINAD
(dB)
72
SPECIFICATION
TEMPERATURE
RANGE
-40°C to 85°C
PACKAGE PACKAGE
LEAD
DESIGNATOR
SO-20
DW
ORDERING
NUMBER
TRANSPORT
MEDIA, QTY
ADS8508IBDW Tube, 25
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.
ABSOLUTE MAXIMUM RATINGS
over operating free-air temperature range (unless otherwise noted)⁽¹⁾
Analog inputs
R1_IN
R2_IN
R3_IN
CAP
REF
DGND, AGND2
Ground voltage differences
Digital inputs
V_ANA
V_DIG to V_ANA
V_DIG
Maximum junction temperature
Storage temperature range
Internal power dissipation
Lead temperature (soldering, 10s)
ADS8508
±25 V
±25 V
±25 V
+V_ANA + 0.3 V to AGND2 - 0.3 V
Indefinite short to AGND2, momentary short to V_ANA
±0.3 V
6V
0.3 V
6V
-0.3 V to +V_DIG + 0.3 V
165°C
–65°C to 150°C
700 mW
260°C
(1) All voltage values are with respect to network ground terminal.
ELECTRICAL CHARACTERISTICS
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)
PARAMETER
Resolution
ANALOG INPUT
Voltage ranges⁽¹⁾
Impedance ⁽¹⁾
Capacitance
THROUGHPUT SPEED
Conversion cycle
Throughput rate
DC ACCURACY
INL
Integral linearity error
DNL
Differential linearity error
No missing codes
Transition noise⁽³⁾
TEST CONDITIONS
Acquire and convert
ADS8508IB
MIN
TYP
MAX
12
UNIT
Bits
50
pF
4
µs
250
kHz
-0.45
0.45 LSB⁽²⁾
-0.45
0.45 LSB
12
Bits
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