Datasheet

LTC2145-14/
LTC2144-14/LTC2143-14
6
21454314fa
DIGITAL INPUTS AND OUTPUTS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Note 5)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
ENCODE INPUTS (ENC
+
, ENC
–
)
Differential Encode Mode (ENC
–
Not Tied to GND)
V
ID
Differential Input Voltage (Note 8)
l
0.2 V
V
ICM
Common Mode Input Voltage Internally Set
Externally Set (Note 8)
l
1.1
1.2
1.6
V
V
V
IN
Input Voltage Range ENC
+
, ENC
–
to GND
l
0.2 3.6 V
R
IN
Input Resistance (See Figure 10) 10 k
C
IN
Input Capacitance (Note 8) 3.5 pF
Single-Ended Encode Mode (ENC
–
Tied to GND)
V
IH
High Level Input Voltage V
DD
= 1.8V
l
1.2 V
V
IL
Low Level Input Voltage V
DD
= 1.8V
l
0.6 V
V
IN
Input Voltage Range ENC
+
to GND
l
0 3.6 V
R
IN
Input Resistance (See Figure 11) 30 k
C
IN
Input Capacitance (Note 8) 3.5 pF
DIGITAL INPUTS (CS, SDI, SCK in Serial or Parallel Programming Mode. SDO in Parallel Programming Mode)
V
IH
High Level Input Voltage V
DD
= 1.8V
l
1.3 V
V
IL
Low Level Input Voltage V
DD
= 1.8V
l
0.6 V
I
IN
Input Current V
IN
= 0V to 3.6V
l
–10 10 µA
C
IN
Input Capacitance (Note 8) 3 pF
SDO OUTPUT (Serial Programming Mode. Open-Drain Output. Requires 2kΩ Pull-Up Resistor if SDO is Used)
R
OL
Logic Low Output Resistance to GND V
DD
= 1.8V, SDO = 0V 200 
I
OH
Logic High Output Leakage Current SDO = 0V to 3.6V
l
–10 10 µA
C
OUT
Output Capacitance (Note 8) 3 pF
DIGITAL DATA OUTPUTS (CMOS MODES: FULL DATA RATE AND DOUBLE DATA RATE)
OV
DD
= 1.8V
V
OH
High Level Output Voltage I
O
= –500µA
l
1.750 1.790 V
V
OL
Low Level Output Voltage I
O
= 500µA
l
0.010 0.050 V
OV
DD
= 1.5V
V
OH
High Level Output Voltage I
O
= –500µA 1.488 V
V
OL
Low Level Output Voltage I
O
= 500µA 0.010 V
OV
DD
= 1.2V
V
OH
High Level Output Voltage I
O
= –500µA 1.185 V
V
OL
Low Level Output Voltage I
O
= 500µA 0.010 V
DIGITAL DATA OUTPUTS (LVDS MODE)
V
OD
Differential Output Voltage 100 Differential Load, 3.5mA Mode
100 Differential Load, 1.75mA Mode
l
247 350
175
454 mV
mV
V
OS
Common Mode Output Voltage 100 Differential Load, 3.5mA Mode
100 Differential Load, 1.75mA Mode
l
1.125 1.250
1.250
1.375 V
V
R
TERM
On-Chip Termination Resistance Termination Enabled, OV
DD
= 1.8V 100 