operated at 2.7 V single supply, except from 0°C to −40°C, where a minimum of 3 V is needed.
Table 1.
Parameter
DC CHARACTERISTICS—RHEOSTAT
MODE (All RDACs)
Resistor Differential Nonlinearity
2
Resistor Integral Nonlinearity
2
Nominal Resistor Tolerance
Resistance Temperature Coefficient
Wiper Resistance
Nominal Resistance Match
DC CHARACTERISTICS—POTENTIOMETER
DIVIDER MODE (All RDACs)
Resolution
Differential Nonlinearity
3
Integral Nonlinearity
3
Voltage Divider Temperature Coefficient
Full-Scale Error
Zero-Scale Error
RESISTOR TERMINALS
Terminal Voltage Range
4
Capacitance Ax, Bx
5
Capacitance Wx
5
Common-Mode Leakage Current
5, 6
DIGITAL INPUTS AND OUTPUTS
Input Logic High
Input Logic Low
Input Logic High
Input Logic Low
Input Logic High
Input Logic Low
Output Logic High (SDO, RDY)
Output Logic Low
Input Current
Input Capacitance
5
POWER SUPPLIES
Single-Supply Power Range
Dual-Supply Power Range
Positive Supply Current
Negative Supply Current
EEMEM Store Mode Current
Symbol
Conditions
Min
Typ
1
Max
Unit
R-DNL
R-INL
∆R
AB
/R
AB
(∆R
AB
/R
AB
)/∆T × 10
6
R
W
R
AB1
/R
AB2
R
WB
R
WB
Dx = 0x3FF
I
W
= 1 V/R
WB
, V
DD
= 5 V, code = 0x200
I
W
= 1 V/R
WB
, V
DD
= 3 V, code = 0x200
Code = 0x3FF, T
A
= 25°C
−2
−4
−30
35
50
200
±0.1
+2
+4
+30
100
LSB
LSB
%
ppm/°C
Ω
Ω
%
N
DNL
INL
(∆V
W
/V
W
)/∆T × 10
6
V
WFSE
V
WZSE
V
A
, V
B
, V
W
C
A
, C
B
C
W
I
CM
V
IH
V
IL
V
IH
V
IL
V
IH
V
IL
V
OH
V
OL
I
IL
C
IL
V
DD
V
DD
/V
SS
I
DD
I
DD
I
SS
I
DD
(store)
I
SS
(store)
−2
−4
Code = half scale
Code = full scale
Code = zero scale
15
−6
0
V
SS
f = 1 MHz, measured to GND,
code = half-scale
f = 1 MHz, measured to GND,
code = half-scale
V
W
= V
DD
/2
With respect to GND, V
DD
= 5 V
With respect to GND, V
DD
= 5 V
With respect to GND, V
DD
= 3 V
With respect to GND, V
DD
= 3 V
With respect to GND, V
DD
= +2.5 V,
V
SS
= −2.5 V
With respect to GND, V
DD
= +2.5 V,
V
SS
= −2.5 V
R
PULL-UP
= 2.2 kΩ to 5 V (see Figure 36)
I
OL
= 1.6 mA, V
LOGIC
= 5 V (see Figure 36)
V
IN
= 0 V or V
DD
2.4
11
80
0.01
10
+2
+4
0
4
V
DD
Bits
LSB
LSB
ppm/°C
LSB
LSB
V
pF
pF
±2
μA
V
V
V
V
V
V
V
V
μA
pF
V
V
μA
μA
μA
mA
mA
0.8
2.1
0.6
2.0
0.5
4.9
0.4
±2.25
5
V
SS
= 0 V
V
IH
= V
DD
or V
IL
= GND, T
A
= 25°C
V
IH
= V
DD
or V
IL
= GND
V
IH
= V
DD
or V
IL
= GND,
V
DD
= +2.5 V, V
SS
= −2.5 V
V
IH
= V
DD
or V
IL
= GND,
V
SS
= GND, I
SS
≈ 0
V
DD
= +2.5 V, V
SS
= −2.5 V
Rev. C | Page 3 of 28
3.0
±2.25
2
3.5
3.5
35
−35
5.5
±2.75
4.5
6.0
6.0
AD5235
Parameter
EEMEM Restore Mode Current
7
Symbol
I
DD
(restore)
I
SS
(restore)
P
DISS
P
SS
BW
THD
W
Conditions
V
IH
= V
DD
or V
IL
= GND,
V
SS
= GND, I
SS
≈ 0
V
DD
= +2.5 V, V
SS
= −2.5 V
V
IH
= V
DD
or V
IL
= GND
∆V
DD
= 5 V ± 10%
−3 dB, V
DD
/V
SS
= ±2.5 V,
R
AB
= 25 kΩ/250 kΩ
V
A
= 1 V rms, V
B
= 0 V, f = 1 kHz
V
A
= 1 V rms, V
B
= 0 V, f = 1 kHz,
R
AB
= 50 kΩ, 100 kΩ
V
A
= V
DD
, V
B
= 0 V,
V
W
= 0.50% error band,
Code 0x000 to Code 0x200,
R
AB
= 25 kΩ/250 kΩ
R
AB
= 25 kΩ/250 kΩ, T
A
= 25°C
V
A
= V
DD
, V
B
= 0 V, measured V
W1
with
V
W2
making full-scale change
V
DD
= V
A1
= +2.5 V, V
SS
= V
B1
= −2.5 V,
measured V
W1
with V
W2
= 5 V p-p @
f = 1 kHz, Code 1 = 0x200, Code 2 =
0x3FF, R
AB
= 25 kΩ/250 kΩ
Min
0.3
−0.3
Typ
1
3
−3
18
0.002
125/12
0.05
0.045
4/36
Max
9
−9
50
0.01
Unit
mA
mA
μW
%/%
kHz
%
%
μs
Power Dissipation
8
Power Supply Sensitivity
5
DYNAMIC CHARACTERISTICS
5, 9
Bandwidth
Total Harmonic Distortion
V
W
Settling Time
t
S
Resistor Noise Density
Crosstalk (C
W1
/C
W2
)
Analog Crosstalk
e
N_WB
C
T
C
TA
20/64
90/21
−81/−62
nV/√Hz
nV-s
dB
1
2
Typicals represent average readings at 25°C and V
DD
= 5 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. I
W
~ 50 μA for V
DD
= 2.7 V and I
W
~ 400 μA for V
DD
= 5 V (see Figure 25).
3
INL and DNL are measured at V
W
with the RDAC configured as a potentiometer divider similar to a voltage output DAC. V
A
= V
DD
and V
B
= V
SS
. DNL specification limits of
±1 LSB maximum are guaranteed monotonic operating conditions (see Figure 26).
4
Resistor Terminal A, Resistor Terminal B, and Resistor Terminal W have no limitations on polarity with respect to each other. Dual-supply operation enables ground-
referenced bipolar signal adjustment.
5
Guaranteed by design and not subject to production test.
6
Common-mode leakage current is a measure of the dc leakage from any Terminal A, Terminal B, or Terminal W to a common-mode bias level of V
DD
/2.
7
EEMEM restore mode current is not continuous. Current is consumed while EEMEM locations are read and transferred to the RDAC register (see Figure 22). To
minimize power dissipation, a NOP, Instruction 0 (0x0) should be issued immediately after Instruction 1 (0x1).
