Rainbow Electronics MAX5489 - Manual (Page 4)

MAX5487/MAX5488/MAX5489
Dual, 256-Tap, Nonvolatile, SPI-Interface,
Linear-Taper Digital Potentiometers
4 _______________________________________________________________________________________
Note 1: All devices are production tested at T A = +25°C and are guaranteed by design and characterization for -40°C < T A < +85°C.
Note 2: DNL and INL are measured with the potentiometer configured as a voltage-divider with H_ = V DD and L_ = 0. The wiper terminal
is unloaded and measured with an ideal voltmeter.
Note 3: DNL and INL are measured with the potentiometer configured as a variable resistor. H_ is unconnected and L_ = 0. For V
DD
=
+5V, the wiper terminal is driven with a source current of 400µA for the 10k Ω configuration, 80µA for the 50kΩ configuration,
and 40µA for the 100k Ω configuration. For V
DD = +3V, the wiper terminal is driven with a source current of 200µA for the 10k Ω
configuration, 40µA for the 50k Ω configuration, and 20µA for the 100kΩ configuration.
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: The device draws higher supply current when the 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 section.
Note 6: Wiper at midscale with a 10pF load.
Note 7: Wiper-settling time is the worst-case 0-to-50% rise time, measured between tap 0 and tap 127. 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 section).
Note 8: Digital timing is guaranteed by design and characterization, and is not production tested.
DC ELECTRICAL CHARACTERISTICS (continued)
(V DD = +2.7V to +5.25V, V H = V DD , V L = GND, T A = -40 °C to +85°C, unless otherwise noted. Typical values are at V
DD = +5.0V,
T A = +25 °C, unless otherwise noted.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
POWER SUPPLIES
Power-Supply Voltage V DD 2.70 5.25 V
Supply Current I DD
During write cycle only, digital inputs =
V
DD or GND
400 µA
Standby Current Digital inputs = V DD or GND, T A = +25°C 0.5 1 µA
H
L
W
VOLTAGE-DIVIDER
CONFIGURATION
VARIABLE-RESISTOR
CONFIGURATION
H
L
Figure 1. Voltage-Divider/Variable-Resistor Configurations