MAX5422 Просмотр технического описания (PDF) - Maxim Integrated
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MAX5422 Datasheet PDF : 11 Pages
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256-Tap, Nonvolatile, SPI-Interface,
Digital Potentiometers
TIMING CHARACTERISTICS (continued)
(VDD = +2.7V to +5.25V, H = VDD, L = GND, TA = -40°C to +85°C. Typical values are at VDD = +5.0V, TA = +25°C, unless otherwise
noted. See Figure 1.) (Note 7)
PARAMETER
DIN Hold after SCLK
SCLK Rise to CS Fall Delay
CS Rise to SCLK Rise Hold
CS Pulse-Width High
Write NV Register Busy Time
SYMBOL
tDH
tCS0
tCS1
tCSW
tBUSY
CONDITIONS
MIN TYP MAX UNITS
0
ns
20
ns
80
ns
200
ns
12
ms
Note 1: The DNL and INL are measured with the potentiometer configured as a voltage-divider with H = VDD and L = GND. The
wiper terminal is unloaded and measured with a high-input-impedance voltmeter.
Note 2: The DNL and INL are measured with the potentiometer configured as a variable resistor. H is unconnected and L = GND.
For the 5V condition, the wiper terminal is driven with a source current of 80µA for the 50kΩ configuration, 40µA for the
100kΩ configuration, and 20µA for the 200kΩ configuration. For the 3V condition, the wiper terminal is driven with a source
current of 40µA for the 50kΩ configuration, 20µA for the 100kΩ, and 10µA for the 200kΩ configuration.
Note 3: The wiper resistance is measured using the source currents given in Note 2. For operation to VDD = 2.7V, see Maximum
Wiper Resistance vs. Temperature in the Typical Operating Characteristics.
Note 4: The device draws higher supply current when the digital inputs are driven with voltages between (VDD - 0.5V) and (GND +
0.5V). See Supply Current vs. Digital Input Voltage in the Typical Operating Characteristics.
Note 5: Wiper at midscale with a 10pF load (DC measurement). L = GND; an AC source is applied to H; and the W output is mea-
sured. A 3dB bandwidth occurs when the AC W/H value is 3dB lower than the DC W/H value.
Note 6: The programming current operates only during power-up and NV writes.
Note 7: Digital timing is guaranteed by design and characterization, and is not production tested.
Note 8: Wiper-settling time is the worst-case 0% to 50% rise-time measured between consecutive wiper positions. H = VDD, L =
GND, and the wiper terminal is unloaded and measured with a 10pF oscilloscope probe.
(VDD = 5.0V, TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics
DNL vs. TAP POSITION
0.25
0.20 VOLTAGE-DIVIDER MODE
0.15
0.10
0.05
0
-0.05
-0.10
-0.15
-0.20
-0.25
0
32 64 96 128 160 192 224 256
TAP POSITION
INL vs. TAP POSITION
0.25
0.20 VOLTAGE-DIVIDER MODE
0.15
0.10
0.05
0
-0.05
-0.10
-0.15
-0.20
-0.25
0
32 64 96 128 160 192 224 256
TAP POSITION
WIPER RESISTANCE vs. TAP POSITION
700
VDD = 2.7V
600 ISRC = 50μA
500
400
300
200
100
0
0 32 64 96 128 160 192 224 256
TAP POSITION
4 _______________________________________________________________________________________
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