DS1868
11 of 14
CAPACITANCE (t
A
=25°C)
PARAMETER SYMBOL MIN TYP MAX UNITS NOTES
Input Capacitance C
IN
5 pF 3, 6
Output Capacitance C
OUT
7 pF 3, 6
AC ELECTRICAL CHARACTERISTICS (-40°C to +85°C; V
CC
=5.0V ± 10%)
PARAMETER SYMBOL MIN TYP MAX UNITS NOTES
CLK Frequency f
CLK
DC 10 MHz 10
Width of CLK Pulse t
CH
50 ns 10
Data Setup Time t
DC
30 ns 10
Data Hold Time t
CDH
10 ns 10
Propagation Delay Time Low to High Level
Clock to Output
t
PLH
50 ns 10, 13
Propagation Delay Time High to Low Level t
PLH
50 ns 10, 13
RST High to Clock Input High
t
CC
50 ns 10
RST Low from Clock Input High
t
HLT
50 ns 10
RST Inactive
t
RLT
125 ns 10
Clock Low to Data Valid on a Read t
CDD
30 ns 10
CLK Rise Time, CLK Fall Time t
CR
50 ns 10
NOTES:
1. All voltages are referenced to ground.
2. Resistor inputs cannot exceed V
B
- 0.5V in the negative direction.
3. Capacitance values apply at 25°C.
4. Absolute linearity is used to determine wiper voltage versus expected voltage as determined by wiper
position. Device test limits ±1.6 LSB.
5. Relative linearity is used to determine the change in voltage between successive tap positions. Device
test limits ±0.5 LSB.
6. Typical values are for t
A
= 25°C and nominal supply voltage.
7. -3 dB cutoff frequency characteristics for the DS1868 depend on potentiometer total resistance:
DS1868-010; 1 MHz, DS1868-050; 200 kHz; and DS1868-100; 80 kHz.
8. Cout is active regardless of the state of RST .
9. V
REF
= 1.5 volts.
10. See Figure 9(a), (b), and (c).
11. Noise < -120 dB/ Hz . Reference 1 volt (thermal).
12. Supply current is dependent on clock rate (see Figure 11).
13. See Figure 10.
14. Standby currents apply when RST , LLIC, DQ are in the low-state.
15. When biasing the substrate minimum V
B
= -3.0V ± 10% and maximum V
CC
= 3.0V ± 10%.
16. Valid at 25°C only.
