Datasheet MAX9910, MAX9911, MAX9912, MAX9913 (Analog Devices) - 9

200kHz, 4µA, Rail-to-Rail I/O Op Amps with Shutdown MAX9910–MAX9913 Pin Description PIN MAX9911 MAX9911 NAME FUNCTION MAX9910 MAX9912 MAX9913 (WLP) (SC70)
A1 1 1 — — IN+ Noninverting Amplifier Input A2 2 2 4 4 VSS Negative Supply Voltage B1 3 3 — — IN- Inverting Amplifier Input C1 4 4 — — OUT Amplifier Output B2 5 6 8 10 VDD Positive Supply Voltage C2 — 5 — — SHDN Shutdown — — — 1 1 OUTA Amplifier Output Channel A — — — 2 2 INA- Inverting Amplifier Input Channel A — — — 3 3 INA+ Noninverting Amplifier Input Channel A — — — — 5 SHDNA Shutdown Channel A — — — — 6 SHDNB Shutdown Channel B — — — 5 7 INB+ Noninverting Amplifier Input Channel B — — — 6 8 INB- Inverting Amplifier Input Channel B — — — 7 9 OUTB Amplifier Output Channel B
Detailed Description
load. These devices can drive a 5kΩ load with swings to within 60mV of the rails. Figure 1 shows the output Featuring a maximized ratio of GBW to supply current, voltage swing of the MAX9910–MAX9913 configured as low operating supply voltage, low input bias current, a unity-gain buffer powered from a single 3V supply. and rail-to-rail inputs and outputs, the MAX9910– MAX9913 are an excellent choice for precision or gen-
Low Input Bias Current
eral-purpose, low-current, low-voltage, battery-powered The MAX9910–MAX9913 feature ultra-low 1pA (typ) applications. These CMOS devices consume an ultra- input bias current. The variation in the input bias current low 4µA (typ) supply current and a 200µV (typ) offset is minimal with changes in the input voltage due to very voltage. For additional power conservation, the high input impedance (in the order of 1GΩ). MAX9911/MAX9913 feature a low-power shutdown mode that reduces supply current to 1nA (typ), and
Applications Information
puts the amplifiers’ output in a high-impedance state.
Driving Capacitive Loads
These devices are unity-gain stable with a 200kHz The MAX9910–MAX9913 amplifiers are unity-gain sta- GBW product, driving capacitive loads up to 30pF. The ble for loads up to 30pF. However, the capacitive load capacitive load can be increased to 250pF when the can be increased to 250pF when the amplifier is config- amplifier is configured for a 10V/V gain. ured for a minimum gain of 10V/V. Applications that
Rail-to-Rail Inputs and Outputs
require greater capacitive-drive capability should use All of the MAX9910–MAX9913 amplifiers have a parallel- an isolation resistor between the output and the capaci- connected n- and p-channel differential input stage that tive load (Figure 2). Also, in unity-gain applications with allows an input common-mode voltage range that relatively small RL (approximately 5kΩ), the capacitive extends 100mV beyond the positive and negative sup- load can be increased up to 200pF. ply rails, with excellent common-mode rejection.
Power-Supply Considerations
The MAX9910–MAX9913 are capable of driving the out- The MAX9910–MAX9913 are optimized for single 1.8V put to within 5mV of both supply rails with a 100kΩ to 5.5V supply operation. A high amplifier power-supply
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