Datasheet

ADS1291
ADS1292
ADS1292R
SBAS502B –DECEMBER 2011–REVISED SEPTEMBER 2012 www.ti.com
ELECTRICAL CHARACTERISTICS (continued)
Minimum and maximum specifications apply from –40°C to +85°C. Typical specifications are at +25°C. All specifications are
at DVDD = 1.8 V, AVDD – AVSS = 3 V
(1)
, V
REF
= 2.42 V, external f
CLK
= 512 kHz, data rate = 500 SPS, C
FILTER
= 4.7 nF
(2)
,
and gain = 6, unless otherwise noted.
ADS1291, ADS1292, ADS1292R
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
SUPPLY CURRENT (RLD Amplifier Turned Off)
AVDD – AVSS = 3 V 205 μA
ADS1292 and
I
AVDD
ADS1292R
AVDD – AVSS = 5 V 250 μA
DVDD = 3.3 V 75 μA
ADS1292 and
I
DVDD
ADS1292R
DVDD = 1.8 V 32 μA
POWER DISSIPATION (Analog Supply = 3 V, RLD Amplifier Turned Off)
Normal mode 670 740 µW
ADS1292 and
ADS1292R
Standby mode 160 µW
Quiescent power
dissipation
Normal mode 450 495 µW
ADS1291
Standby mode 160 µW
ADS1292R Normal mode 335 µW
Quiescent power
dissipation, per ADS1292 Normal mode 335 µW
channel
ADS1291 Normal mode 450 µW
POWER DISSIPATION (Analog Supply = 5 V, RLD Amplifier Turned Off)
Normal mode 1300 µW
ADS1292 and
ADS1292R
Standby mode 340 µW
Quiescent power
dissipation
Normal mode 950 µW
ADS1291
Standby mode 340 µW
ADS1292R Normal mode 670 µW
Quiescent power
dissipation, per ADS1292 Normal mode 670 µW
channel
ADS1291 Normal mode 860 µW
POWER DISSIPATION IN POWER-DOWN MODE
DVDD = 1.8 V 1 µW
Analog supply = 3 V
DVDD = 3.3 V 4 µW
DVDD = 1.8 V 5 µW
Analog supply = 5 V
DVDD = 3.3 V 10 µW
TEMPERATURE
Specified temperature range –40 +85 °C
Operating temperature range –40 +85 °C
Storage temperature range –60 +150 °C
THERMAL INFORMATION
ADS1291, ADS1292, ADS1292R
THERMAL METRIC
(1)
PBS (TQFP) RSM (QFN) UNITS
32 PINS 32 PINS
θ
JA
Junction-to-ambient thermal resistance 68.4 33.7
θ
JCtop
Junction-to-case (top) thermal resistance 25.9 36.4
θ
JB
Junction-to-board thermal resistance 30.5 25.2
°C/W
ψ
JT
Junction-to-top characterization parameter 0.5 0.2
ψ
JB
Junction-to-board characterization parameter 24.3 7.4
θ
JCbot
Junction-to-case (bottom) thermal resistance n/a 2.2
(1) For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.
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