Datasheet
Note 1: Specifications are 100% production tested at +25°C, unless otherwise noted. Limits over temperature are guaranteed by
design.
Note 2: Guaranteed by design. Thermocouple and leakage effects preclude measurement of this parameter during production test-
ing. Devices are screened during production testing to eliminate defective units.
Note 3: IN+ and IN- are gates to CMOS transistors with typical input bias current of 1pA. CMOS leakage is so small that it is impracti-
cal to test and guarantee in production. Max V
DIFF
is ±100mV. Devices are screened during production testing to eliminate
defective units. For the MAX4208, when there are no external resistors, the input bias current at FB and REF is 1pA (typ).
Note 4: Setting REF to ground (V
SS
) is allowed if the REF buffer is off. The unity-gain buffer is on when V
REFIN/MODE
is between
0.15V and (V
DD
- 1.3V). In this range, V
REF
= V
REFIN/MODE
±40μV (maximum buffer input offset voltage over tempera-
ture). Setting REFIN/MODE to V
DD
puts the part in shutdown (I
DD
= 1.4μA).
Note 5: This is the REF current needed to directly drive the end terminal of the gain-setting resistors when REFIN/MODE is con-
nected to V
SS
to put the buffer in high-impedance mode. The REF input current is tested at the gain of 100. At gain 10 and
1000, I
REF
= ±100μA and 3.4μA, respectively at +25°C. See the Detailed Description.
Note 6: Output swing high (V
OH
) and output swing low (V
OL
) are measured only on G = 100 and G = 1000 devices. Devices with G
= 1 and G = 10 have output swing high limited by the range of V
REF
, V
CM
, and V
DIFF
(see the Output Swing section).
Note 7: Maximum range for V
DIFF
is from -100mV to +100mV.
Note 8: At G = 100V/V and G = 1000V/V, these instrumentation amplifiers are bandwidth limited and not capable of slew-rate-limited dV/dt.
(V
DD
= 5V, V
SS
= 0V, V
CM
= V
REF
= V
DD
/2, V
REFIN/MODE
= V
SS
, R
L
= 100kΩ to V
DD
/2, V
DIFF
= (V
IN+
- V
IN-
) = 0V, MAX4208 set for
G = 100V/V (R1 = 1kΩ, R2 = 99kΩ), T
A
= -40°C to +125°C, unless otherwise noted.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
REFIN/MODE Input-Voltage
High
V
IH
MAX4208/MAX4209 in shutdown V
DD
- 0.2 V
REFIN/MODE Buffer
Common-Mode Rejection Ratio
(V
SS
+ 0.2V)
≤ V
REF
≤
(V
DD
- 1.6V)
T
A
= +25°C to +85°C 96
dB
T
A
= -40°C to +125°C 90
REF Common-Mode Range
(Note 4)
Guaranteed by REF CMRR test V
SS
V
DD
- 1.6 V
REF Common-Mode Rejection
Ratio
V
SS
≤ V
REF
≤ (V
DD
-
1.6V)
T
A
= +25°C to +85°C 96
dB
T
A
= -40°C to +125°C 90
REFIN/MODE Buffer
Power-Supply Rejection Ratio
V
DD
= 2.85V to 5.5V,
V
REFIN/MODE
= V
CM
= (V
SS
+ 0.5V)
T
A
= +25°C to +85°C 96
dB
T
A
= -40°C to +125°C 90
OUTPUT DC CHARACTERISTICS
Output Voltage Swing (Note 6)
V
OH
V
DD
- V
OUT
R
L
= 100kΩ 60
mV
R
L
= 10kΩ 90
R
L
= 1kΩ 375
V
OL
V
OUT
- V
SS
R
L
= 100kΩ 50
R
L
= 10kΩ 75
R
L
= 1kΩ 325
POWER SUPPLY
Supply Voltage V
DD
Guaranteed by PSRR test 2.85 5.50 V
Supply Current
V
REFIN/MODE
= V
SS
,
buffer OFF
V
DD
= 5V 1.70
mA
(V
SS
+ 0.2V) ≤ V
REFIN/MODE
≤
(V
DD
- 1.6V), buffer ON
V
DD
= 5V 3.0
REFIN/MODE = V
DD
, shutdown mode 10 µA
MAX4208/MAX4209 Ultra-Low Offset/Drift, Precision
Instrumentation Ampliers with REF Buffer
www.maximintegrated.com
Maxim Integrated
│
6
Electrical Characteristics (continued)