Datasheet
SLAS248D − DECEMBER 1999 − REVISED SEPTEMBER 2005
www.ti.com
6
ELECTRICAL CHARACTERISTICS (Cont.)
Over operating free-air temperature range, AVDD = DVDD = 3.3V, unless otherwise noted.
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
Reference Voltage
Bandgap voltage, internal mode 1.425 1.5 1.575 V
Input impedance 40 kΩ
Positive reference voltage, REF+ 2.5 V
Negative reference voltage, REF− 0.5 V
Reference difference, ∆REF, REF+ − REF− 2 V
Accuracy, internal reference 5%
Temperature coefficient 40 ppm/°C
Voltage coefficient 200 ppm/V
Analog Inputs
Positive analog input, IN+ 0 AV
DD
V
Negative analog input, IN− 0 AV
DD
V
Analog input voltage difference ∆A
IN
= IN+ − IN−, V
REF
= REF+ − REF− −V
REF
V
REF
V
Input impedance 25 kΩ
PGA range 0 7 dB
PGA step size 1 dB
PGA gain error ±0.25 dB
Digital Inputs
V
IH
High-level digital input 2 V
V
IL
Low-level digital input 0.8 V
Input capacitance 5 pF
Input current ±1 µA
Digital Outputs
V
OH
High-level digital output I
OH
= 50 µA 2.6 V
V
OL
Low-level digital output I
OL
= 50 µA 0.4 V
I
OZ
Output current, high impedance ±10 µA
Clock Timing (CS low)
THS1401 0.1
†
1 1 MHz
f
CLK
Clock frequency
THS1403 0.1
†
3 3 MHz
f
CLK
Clock frequency
THS1408 0.1
†
8 8 MHz
t
d
Output delay time 25 ns
Latency 9.5 Cycles
†
This parameter is not production tested for Q- and M-suffix devices.