Changes to Ordering Guide .......................................................... 24
3/10—Rev. 0 to Rev. A
Changes to Product Title and General Description.....................1
Changes to Theory of Operation Section...................................14
10/09—Revision 0: Initial Version
Rev. F | Page 2 of 24
Data Sheet
SPECIFICATIONS
ELECTRICAL CHARACTERISTICS—AD5270
AD5270/AD5271
V
DD
= 2.7 V to 5.5 V, V
SS
= 0 V; V
DD
= 2.5 V to 2.75 V, V
SS
= −2.5 V to −2.75 V; −40°C < T
A
< +125°C, unless otherwise noted.
Table 1.
Parameter
DC CHARACTERISTICS—RHEOSTAT MODE
Resolution
Resistor Integral Nonlinearity
2, 3
Symbol
Test Conditions/Comments
Min
10
−1
−1
−1
−1
−1
±0.5
±15
5
35
Typ
1
Max
Unit
Bits
LSB
LSB
LSB
LSB
%
%
ppm/°C
Ω
V
pF
pF
50
nA
R-INL
R
AW
= 20 kΩ, |V
DD
− V
SS
| = 3.0 V to 5.5 V
R
AW
= 20 kΩ, |V
DD
− V
SS
| = 2.7 V to 3.0 V
R
AW
= 50 kΩ, 100 kΩ
Resistor Differential Nonlinearity
2
Nominal Resistor Tolerance
R-Perf Mode
4
Normal Mode
Resistance Temperature Coefficient
5, 6
Wiper Resistance
RESISTOR TERMINALS
Terminal Voltage Range
5
, 7
Capacitance
5
A
Capacitance
5
W
Common-Mode Leakage Current
5
DIGITAL INPUTS
Input Logic
5
High
Low
Input Current
Input Capacitance
5
DIGITAL OUTPUT
Output Voltage
5
High
Low
R-DNL
See
Table 2
and
Table 3
Code = full scale
Code = zero scale
+1
+1.5
+1
+1
+1
70
V
DD
V
SS
f = 1 MHz, measured to GND, code =
half scale
f = 1 MHz, measured to GND, code =
half scale
V
A
= V
W
90
40
V
INH
V
INL
I
IN
C
IN
2.0
0.8
±1
5
V
V
µA
pF
V
OH
V
OL
R
PULL_UP
= 2.2 kΩ to V
DD
R
PULL_UP
= 2.2 kΩ to V
DD
V
DD
= 2.7 V to 5.5 V, V
SS
= 0 V
V
DD
= 2.5 V to 2.75 V, V
SS
= −2.5 V to −2.75 V
V
DD
− 0.1
0.4
0.6
+1
5
V
V
V
µA
pF
V
V
µA
µA
mA
mA
500
µA
µA
Tristate Leakage Current
Output Capacitance
5
POWER SUPPLIES
Single-Supply Power Range
Dual-Supply Power Range
Supply Current
Positive
Negative
50-TP Store Current
5
, 8
Positive
Negative
OTP Read Current
5
, 9
Positive
Negative
−1
V
SS
= 0 V
2.7
±2.5
5.5
±2.75
1
I
DD
I
SS
I
DD_OTP_STORE
I
SS_OTP_STORE
I
DD_OTP_READ
I
SS_OTP_READ
−1
4
−4
−500
Rev. F | Page 3 of 24
AD5270/AD5271
Parameter
Power Dissipation
10
Power Supply Rejection Ratio
5
Symbol
PSRR
Test Conditions/Comments
V
IH
= V
DD
or V
IL
= GND
ΔV
DD
/ΔV
SS
= ±5 V ± 10%
R
AW
= 20 kΩ
R
AW
= 50 kΩ
R
AW
= 100 kΩ
−3 dB, R
AW
= 10 kΩ, Terminal W,
see
Figure 42
R
AW
= 20 kΩ
R
AW
= 50 kΩ
R
AW
= 100 kΩ
V
A
= 1 V rms, f = 1 kHz,
Min
Typ
1
Data Sheet
Max
5.5
−55
−67
−70
kHz
300
120
60
dB
−90
−88
−85
nV/√Hz
13
25
32
Unit
µW
dB
−66
−75
−78
DYNAMIC CHARACTERISTICS
5
, 11
Bandwidth
Total Harmonic Distortion
code = half scale
R
AW
= 20 kΩ
R
AW
= 50 kΩ
R
AW
= 100 kΩ
Code = half scale, T
A
= 25°C
R
AW
= 20 kΩ
R
AW
= 50 kΩ
R
AW
= 100 kΩ
Resistor Noise Density
Typical specifications represent average readings at 25°C, V
DD
= 5 V, and V
SS
= 0 V.
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.
1
2
Table 2. AD5270—20 kΩ Resistor Performance Mode Code Range
Resistor Tolerance Per Code
R-TOLERANCE
1% R-Tolerance
2% R-Tolerance
3% R-Tolerance
|V
DD
− V
SS
| = 4.5 V to 5.5 V
From 0x078 to 0x3FF
From 0x037 to 0x3FF
From 0x028 to 0x3FF
|V
DD
− V
SS
| = 2.7 V to 4.5 V
From 0x0BE to 0x3FF
From 0x055 to 0x3FF
From 0x037 to 0x3FF
Table 3. AD5270—50 kΩ and 100 kΩ Resistor Performance Mode Code Range
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