Linear Technology LTC2170-12, Manual, Page: 5 / 34

LTC2172-12/
LTC2171-12/LTC2170-12
5
21721012fb
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 kΩ
C
IN
Input Capacitance 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 kΩ
C
IN
Input Capacitance 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 3 pF
SDO OUTPUT (Serial Programming Mode. Open-Drain Output. Requires 2k Pull-Up Resistor if SDO Is Used)
R
OL
Logic Low Output Resistance to GND V
DD
= 1.8V, SDO = 0V 200 Ω
I
OH
Logic High Output Leakage Current SDO = 0V to 3.6V
l
–10 10 µA
C
OUT
Output Capacitance 3 pF
DIGITAL DATA OUTPUTS
V
OD
Differential Output Voltage 100Ω Differential Load, 3.5mA Mode
100Ω Differential Load, 1.75mA Mode
l
l
247
125
350
175
454
250
mV
mV
V
OS
Common Mode Output Voltage 100Ω Differential Load, 3.5mA Mode
100Ω Differential Load, 1.75mA Mode
l
l
1.125
1.125
1.250
1.250
1.375
1.375
V
V
R
TERM
On-Chip Termination Resistance Termination Enabled, OV
DD
= 1.8V 100 Ω
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)