Datasheet
SBAS306F − NOVEMBER 2004 − REVISED OCTOBER 2007
www.ti.com
4
ELECTRICAL CHARACTERISTICS (continued)
All specifications at T
A
= −40°C to +105°C, AVDD = +5V, DVDD = +1.8V, f
CLK
= 27MHz, VREFP = 2.5V, and VREFN = 0V, unless otherwise noted.
Specified values for ADS1271 and ADS1271B (high-grade version) are the same, except where shown in BOLDFACE type.
ADS1271BADS1271
PARAMETER UNITSMAXTYPMINMAXTYPMINTEST CONDITIONS
Voltage Reference Inputs
Reference input voltage (V
REF
) V
REF
= VREFP – VREFN 2.0 2.5 2.65 0.5 2.5 2.65 V
Negative reference input (VREFN) AGND − 0.1 VREFP − 2.0 AGND − 0.1 VREFP − 0.5 V
Positive reference input (VREFP) VREFN + 2.0 AVDD − 0.5 VREFN + 0.5 AVDD + 0.1 V
Reference
High-Speed mode 4.2 4.2 kΩ
Reference
Input
impedance
High-Resolution mode 4.2 4.2 kΩ
Input
impedance
Low-Power mode 8.4 8.4 kΩ
Digital Input/Output
V
IH
0.7 DVDD DVDD 0.7 DVDD DVDD V
V
IL
DGND 0.3 DVDD DGND 0.3 DVDD V
V
OH
I
OH
= 5mA 0.8 DVDD DVDD 0.8 DVDD DVDD V
V
OL
I
OL
= 5mA DGND 0.2 DVDD DGND 0.2 DVDD V
Input leakage
(4)
0 < V
IN
DIGITAL
< DVDD ±10 ±10 µA
Master clock rate (f
CLK
) 0.1 27 0.1 27 MHz
SPI format 24 f
DATA
f
CLK
24 f
DATA
f
CLK
MHz
Serial clock
rate (f )
(5)
High-Speed mode 64 f
DATA
64 f
DATA
64 f
DATA
64 f
DATA
MHz
Serial clock
rate (f
SCLK
)
(5)
Frame-Sync format
High-Resolution mode 128 f
DATA
128 f
DATA
128 f
DATA
128 f
DATA
MHz
SCLK
Frame-Sync format
Low-Power mode 64 f
DATA
64 f
DATA
64 f
DATA
64 f
DATA
MHz
Power Supply
AVDD 4.75 5 5.25 4.75 5 5.25 V
DVDD 1.65 3.6 1.65 3.6 V
High-Speed mode 17 25 17 25 mA
High-Resolution mode 17 25 17 25 mA
AVDD current
Low-Power mode 6.3 9.5 6.3 9.5 mA
AVDD current
Power-Down mode
T > 85°C 1 70 1 70 µA
Power-Down mode
T ≤ 85°C 1 10 1 10 µA
High-Speed mode 3.5 6 3.5 6 mA
High-Resolution mode 2.5 5 2.5 5 mA
DVDD current
Low-Power mode 1.8 3.5 1.8 3.5 mA
DVDD current
Power-Down mode
T > 85°C, DVDD = 3.3V 1 70 1 70 µA
Power-Down mode
T ≤ 85°C, DVDD = 3.3V 1 20 1 20 µA
Power
High-Speed mode 92 136 92 136 mW
Power
dissipation
High-Resolution mode 90 134 90 134 mW
dissipation
Low-Power mode 35 54 35 54 mW
Temperature Range
Specified −40 +105 −40 +105 _C
Operating −40 +105 −40 +105 _C
Storage −60 +150 −60 +150 _C
(1)
FSR = full-scale range = 2V
REF
.
(2)
Minimum SNR is ensured by the limit of the DC noise specification.
(3)
THD includes the first nine harmonics of the input signal.
(4)
MODE and FORMAT pins excluded.
(5)
See the text for more details on SCLK.