Rainbow Electronics DS1800 - Manual (Page 8)

DS1800
072095 8/13
AC ELECTRICAL CHARACTERISTICS (–40 ° C to +85 ° C; V
CC
=2.7V to 5.5V)
PARAMETER SYMBOL MIN TYP MAX UNITS NOTES
CLK Frequency f
CLK
DC 10 MHz
Width of CLK Pulse t
CH
50 ns
Data Setup Time t
DC
30 ns
Data Hold Time t
CDH
10 ns
Propagation Delay Time
Low to High Level
High to Low Level
t
PLH
50 ns
RST High to Clock Input High t
CC
50 ns
RST Low from Clock Input High t
HLT
50 ns
CLK Rise Time t
CB
50 ns
RST Inactive t
BLT
200 ns
AC ELECTRICAL CHARACTERISTICS
PUSHBUTTON INPUTS
(–40
°
C to +85
°
C; V
CC
=2.7V to 5.5V)
PARAMETER SYMBOL MIN TYP MAX UNITS NOTES
Single Pulse Input
Slow Mode
Fast Mode
t
CPW
1
50
800 ms
µ s
3, 5, 11
Repetitive Input Pulse High Time
Slow Mode
Fast Mode
t
HPW
1
50
800 ms
µ s
3, 5, 11
Continuous Input Pulse t
CCP
0.8 DC s 3, 5, 11
NOTES:
1. All voltages are referenced to ground
2. Valid for V
CC
= 5V only.
3. Both PxA and PxG inputs are internally pulled up with a 50K Ω resistance.
4. Capacitance values apply at 25 ° C.
5. Input pulse width is the minimum time required for an input to cause an increment or decrement of wiper posi-
tion. If the PxA or PxG inputs are held active for longer than 0.8 seconds, subsequent increments or decre-
ments will occur at intervals of 25 ms. Timing tolerances for pushbutton control are specified at 35%.
6. Inter–Channel Matching is used to determine the relative voltage difference in dB between the same position
on each potentiometer. The DS1800 is specified for
±
0.25 dB inter channel matching from position 0 to posi-
tion 112 (+20 dB to –27 dB) and ± 0.5 dB from position 113 to position 127.
7. Tap–to–Tap tolerance is used to determine the change in voltage between successive tap positions. The
DS1800 is specified for ± 0.5 dB tap–to–tap tolerance. From position 0 to position 112 (+20 dB to –27 dB).
From position 113 to position 127, the DS1800 is specified for
±
1 dB tap–to–tap tolerance.