DS1800 Datasheet, PDF (9/14 Pages) Dallas Semiconductor – Dual Inverting Log Gain/Attenuator

DS1800
AC ELECTRICAL CHARACTERISTICS (-40°C to +85°C; V_CC=2.7V to 5.5V)
PARAMETER
SYMBOL MIN
TYP MAX UNITS NOTES
CLK Frequency
Width of CLK Pulse
Data Setup Time
Data Hold Time
Propagation Delay Time
Low to High Level
High to Low Level
f_CLK
DC
t_CH
50
t_DC
30
t_CDH
10
t_PLH
10
MHz
ns
ns
ns
50
ns
RST High to Clock Input High
t_CC
50
ns
RST Low to Clock Input High
t_HLT
50
ns
CLK Rise Time
RST Inactive
t_CB
t_BLT
200
50
ns
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
Repetitive Input Pulse High Time
Slow Mode
Fast Mode
Continuous Input Pulse
t_CPW
1
50
t_HPW
1
50
t_CCP
0.8
3,5,11
800
ms
µs
3,5,11
800
ms
µs
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 50KΩ 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 position. If the PxA or PxG inputs are held active for longer than 0.8 seconds, subsequent
increments or decrements 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 position 112 (+20 dB to –27 dB) and ±0.5 dB from position 113 to position 127.
9 of 14