Datasheet

MAX5426
Precision Resistor Network for
Programmable Instrumentation Amplifiers
_______________________________________________________________________________________ 3
Note 1: Total error when configured as instrumentation amplifier. Assumes ideal op amps.
Note 2: Each stage (input stage and output stage) is tested for accuracy separately and combined to give the total gain accuracy.
The input stage is tested as follows: OUT1 = 10V, OUT2 = 0. Output stage is tested as follows OUT1 = 10V, OUT2 = 0 and
OUT2 = 10V, OFFSET = 0.
Note 3: Gain of 1 configuration is open circuit (infinite impedance).
Note 4: Equivalent load at each pin is calculated according to instrumentation amplifier configuration and assumes ideal op amps.
Note 5: See Timing Diagram.
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +15V, V
SS
= -15V, GND = 0, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Gain = 2 29
Gain = 4 15
Resistance Between FB1 and FB2
(Note 3)
R
FB1
,
R
FB2
Gain = 8 7
kΩ
Gain = 1 0
Gain = 2 15
Gain = 4 22
Resistance Between OUT2 and
FB2
R
OUT2
,
R
FB2
Gain = 8 26
kΩ
Input Impedance at FB1 Z
FB1
0kΩ
Input Impedance at FB2 Z
FB2
0kΩ
Gain = 1 0
Gain = 2 9.5
Gain = 4 12
Input Impedance at OUT1
(Note 4)
Z
OUT1
Gain = 8 13
kΩ
Gain = 1 0
Gain = 2 9.5
Gain = 4 12
Input Impedance at OUT2
(Note 4)
Z
OUT2
Gain = 8 13
kΩ
Input Impedance at INDIF+
(Note 4)
Z
INDIF+
0kΩ
Input Impedance at INDIF-
(Note 4)
Z
INDIF-
0kΩ
Input Impedance at OUT (Note 4) Z
OUT
26 kΩ
Input Impedance at OFFSET
(Note 4)
Z
OFFSET
26 kΩ
POWER REQUIREMENTS
Positive Power-Supply Voltage V
DD
4.75 15.75 V
Negative Power-Supply Voltage V
SS
-15.75 -4.75 V
D1 = D0 = 0 10
Positive Supply Current I
DD
D1 = D0 = 5V 36 80
µA
Negative Supply Current I
SS
0.01 10 µA
TIMING REQUIREMENTS
Switching Time (Note 5) t
SWITCHING
(Figure 3) 60 ns