Datasheet

MAX5450–MAX5455
Dual, 256-Tap, Up/Down Interface,
Digital Potentiometers
_______________________________________________________________________________________ 3
Note 1: Linearity is defined in terms of the H_ to L_ code-dependent resistance.
Note 2: The DNL and INL are measured with the potentiometer configured as a voltage divider with H_ = V
DD
and L_ = GND. The
wiper terminal is unloaded and measured with an ideal voltmeter.
Note 3: The DNL and INL are measured with the potentiometer configured as a variable resistor. For the 3-terminal potentiometers
(MAX5451/MAX5453/MAX5455), H_ is unconnected and L_ = GND. For the 2-terminal potentiometers
(MAX5450/MAX5452/MAX5454), L_ = GND. At V
DD
= +5V, the wiper terminal is driven with a source current of 400µA for the
10kΩ configuration, 80µA for the 50kΩ configuration, and 40µA for the 100kΩ configuration. At V
DD
= +3V,
200µA/40µA/20µA for 10kΩ/50kΩ/100kΩ configuration, respectively.
Note 4: The wiper resistance is the worst value measured by injecting the currents given in Note 3 into W_ with L_ = GND. R
W
_ =
(V
W
_ - V
H
_) / I
W
_.
Note 5: Device draws higher supply current when digital inputs are driven with voltages between (V
DD
- 0.5V) and (GND + 0.5V).
(See Supply Current vs. Digital Input Voltage in the Typical Operating Characteristics.)
Note 6: Wiper-Settling Time is the worst case 0% to 50% rise-time measured between consecutive wiper positions. H_ = V
DD
, L_ =
GND, and the wiper terminal is unloaded and measured with a 10pF oscilloscope probe (see Tap-To-Tap Switching
Transient in the Typical Operating Characteristics).
Note 7: Digital timing is guaranteed by design.
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +2.7V to +5.5V, V
H
= V
DD
, V
L
= 0; T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
DD
= +5V, T
A
= +25°C,
unless otherwise noted.)
PARAMETER SYM B O L CONDITIONS MIN TYP MAX UNITS
DIGITAL INPUTS (Note 5)
Input High Voltage V
IH
0.7 x V
DD
V
Input Low Voltage V
IL
0.3 x V
DD
V
Input Leakage Current ±1.0 µA
Input Capacitance 5pF
TIMING CHARACTERISTICS (Analog)
MAX5451 0.5
MAX5453 1.2
Wiper-Settling Time
(Note 6)
t
IW
MAX5455 1.8
µs
TIMING CHARACTERISTICS (Digital, Note 7, Figure 1)
Maximum INC Frequency f
MAX
7 MHz
CS to INC Setup Time t
CI
25 ns
CS to INC Hold Time t
IC
0ns
INC Low Period t
IL
25 ns
INC High Period t
IH
25 ns
U/D to INC Setup t
DI
50 ns
U/D to INC Hold t
ID
0ns
POWER SUPPLIES
Supply Voltage V
DD
2.7 5.5 V
V
DD
= +5V 0.7 2
Supply Current I
DD
CS = INC = U/D = V
DD
or GND
V
D D
= + 2.7V 0.1
µA