Datasheet

AD5270/AD5271 Data Sheet
Rev. F | Page 4 of 24
Parameter Symbol Test Conditions/Comments Min Typ
1
Max Unit
Power Dissipation
10
V
IH
= V
DD
or V
IL
= GND 5.5 µW
Power Supply Rejection Ratio
5
PSRR ΔV
DD
/ΔV
SS
= ±5 V ± 10% dB
R
AW
= 20 kΩ −66 −55
R
AW
= 50 kΩ
−75
−67
R
AW
= 100 kΩ −78 −70
DYNAMIC CHARACTERISTICS
5, 11
Bandwidth −3 dB, R
AW
= 10 kΩ, Terminal W,
see
Figure 42
kHz
R
AW
= 20 kΩ 300
R
AW
= 50 kΩ 120
R
AW
= 100 kΩ
60
Total Harmonic Distortion V
A
= 1 V rms, f = 1 kHz,
code = half scale
dB
R
AW
= 20 kΩ −90
R
AW
= 50 kΩ
−88
R
AW
= 100 kΩ −85
Resistor Noise Density Code = half scale, T
A
= 25°C nV/√Hz
R
AW
= 20 kΩ 13
R
AW
= 50 kΩ 25
R
AW
= 100 kΩ 32
1
Typical specifications represent average readings at 25°C, V
DD
= 5 V, and V
SS
= 0 V.
2
Resistor position nonlinearity error (R-INL) is the deviation from an ideal value measured between the maximum resistance and the minimum resistance wiper
positions. R-DNL measures the relative step change from ideal between successive tap positions.
3
The maximum current in each code is defined by I
AW
= (V
DD
− 1)/R
AW
.
4
The terms resistor performance mode and R-Perf mode are used interchangeably. See the Resistor Performance Mode section.
5
Guaranteed by design and not subject to production test.
6
See Figure 25 for more details.
7
Resistor Terminal A and Resistor Terminal W have no limitations on polarity with respect to each other. Dual-supply operation enables ground referenced bipolar
signal adjustment.
8
Different from operating current, the supply current for the fuse program lasts approximately 55 ms.
9
Different from operating current, the supply current for the fuse read lasts approximately 500 ns.
10
P
DISS
is calculated from (I
DD
× V
DD
) + (I
SS
× V
SS
).
11
All dynamic characteristics use V
DD
= +2.5 V, V
SS
= −2.5 V.
Table 2. AD5270—20 kΩ Resistor Performance Mode Code Range
Resistor Tolerance Per Code |V
DD
− V
SS
| = 4.5 V to 5.5 V |V
DD
− V
SS
| = 2.7 V to 4.5 V
R-TOLERANCE
1% R-Tolerance From 0x078 to 0x3FF From 0x0BE to 0x3FF
2% R-Tolerance From 0x037 to 0x3FF From 0x055 to 0x3FF
3% R-Tolerance From 0x028 to 0x3FF From 0x037 to 0x3FF
Table 3. AD5270—50 kΩ and 100 kΩ Resistor Performance Mode Code Range
Resistor Tolerance Per Code R
AW
= 50 kΩ R
AW
= 100 kΩ
R-TOLERANCE
1% R-Tolerance From 0x078 to 0x3FF From 0x04B to 0x3FF
2% R-Tolerance From 0x055 to 0x3FF From 0x032 to 0x3FF
3% R-Tolerance From 0x032 to 0x3FF From 0x019 to 0x3FF