Datasheet

ADS1299
www.ti.com SBAS499A –JULY 2012–REVISED AUGUST 2012
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 = 3.3 V, AVDD – AVSS = 5 V, V
REF
= 4.5 V, external f
CLK
= 2.048 MHz, data rate = 250 SPS, and gain = 12, unless
otherwise noted.
ADS1299
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
CLOCK
Internal oscillator clock frequency Nominal frequency 2.048 MHz
T
A
= +25°C ±0.5 %
Internal clock accuracy
–40°C ≤ T
A
≤ +85°C ±2.5 %
Internal oscillator start-up time 20 μs
Internal oscillator power consumption 120 μW
External clock input frequency CLKSEL pin = 0 1.5 2.048 2.25 MHz
DIGITAL INPUT/OUTPUT (DVDD = 1.8 V to 3.6 V)
V
IH
High 0.8 DVDD DVDD + 0.1 V
Logic level,
input voltage
V
IL
Low –0.1 0.2 DVDD V
V
OH
High I
OH
= –500 μA 0.9 DVDD V
Logic level,
output voltage
V
OL
Low I
OL
= +500 μA 0.1 DVDD V
I
IN
Input current 0 V < V
DigitalInput
< DVDD –10 +10 μA
POWER-SUPPLY REQUIREMENTS
Analog supply (AVDD – AVSS) 4.75 5 5.25 V
DVDD Digital supply 1.8 1.8 3.6 V
AVDD – DVDD –2.1 3.6 V
SUPPLY CURRENT (Bias Turned Off)
I
AVDD
AVDD – AVSS = 5 V 7.14 mA
Normal mode DVDD = 3.3 V 1 mA
I
DVDD
DVDD = 1.8 V 0.5 mA
POWER DISSIPATION (Analog Supply = 5 V, Bias Amplifiers Turned Off)
Normal mode 39 42 mW
Quiescent power dissipation Power-down 10 μW
Standby mode, internal reference 5.1 mW
Quiescent power dissipation,
Normal mode 4.3 mW
per channel
TEMPERATURE
Specified –40 +85 °C
Temperature
Operating –40 +85 °C
range
Storage –60 +150 °C
THERMAL INFORMATION
ADS1299
THERMAL METRIC
(1)
PAG UNITS
64 PINS
θ
JA
Junction-to-ambient thermal resistance 43.3
θ
JCtop
Junction-to-case (top) thermal resistance 36.5
θ
JB
Junction-to-board thermal resistance 60.6
°C/W
ψ
JT
Junction-to-top characterization parameter 0.1
ψ
JB
Junction-to-board characterization parameter 19.5
θ
JCbot
Junction-to-case (bottom) thermal resistance n/a
(1) For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.
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