Datasheet

MAX4036–MAX4039
Low I
BIAS
, +1.4V/800nA, Rail-to-Rail Op Amps
with +1.2V Buffered Reference
10 ______________________________________________________________________________________
Detailed Description
The MAX4036–MAX4039 consume an ultra-low supply
current and have rail-to-rail output stages specifically
designed for low-voltage operation. The input common-
mode voltage range extends from V
DD
- 0.4V to V
SS
,
although full rail-to-rail input range is possible with
degraded performance when operating from a supply
voltage above 3.0V. The input offset voltage is typically
200µV. Low-operating supply voltage, low supply current,
and rail-to-rail outputs make the MAX4036–MAX4039 an
excellent choice for precision or general-purpose low-
voltage, battery-powered systems.
Rail-to-Rail Outputs
The MAX4036–MAX4039 output stages can drive a 5kΩ
load and still swing to within 40mV of the rails. Figure 1
shows the output voltage swing of the MAX4036–
MAX4039 configured as a unity-gain buffer, powered
from a single 2.4V supply. The output for this setup typi-
cally swings from 5mV to V
DD
- 5mV with a 100kΩ load.
PIN
MAX4038/
MAX4038A
MAX4039
MAX4036/
MAX4036A
MAX4037
µMAX*/TDFN UCSP
µMAX/TDF
UCSP
NAME FUNCTION
1 3 — — — — IN+ Noninverting Amplifier Input
2 2 4 A2 5 A2 V
SS
Negative Power-Supply Voltage
3 4 — — — — IN- Inverting Amplifier Input
4 1 — — — — OUT Amplifier Output
56 8C210C2V
DD
Positive Power-Supply Voltage
— 5 — — 6 B2 REF Reference Voltage Output
— — 1 C1 1 C1 OUTA Amplifier Output (Channel A)
— — 2 B1 2 B1 INA- Inverting Amplifier Input (Channel A)
— — 3 A1 3 A1 INA+ Noninverting Amplifier Input (Channel A)
— — 5 A3 7 A3 INB+ Noninverting Amplifier Input (Channel B)
— — 6 B3 8 B3 INB- Inverting Amplifier Input (Channel B)
— — 7 C3 9 C3 OUTB Amplifier Output (Channel B)
— — — B2 4 — N.C. No Connection. Not internally connected.
—— ————
EP
(TDFN only)
Exposed Paddle. Solder EP to V
SS
or leave
unconnected (TDFN packages only).
2ms/div
1V/div
V
IN_+
1.5V
1.5V
V
OUT+
A
V
= 1V/V
Figure 1. Rail-to-Rail Input/Output Voltage Range
* Both MAX4038/MAX4038A available in µMAX package only.