MAX9636(2011) Ver la hoja de datos (PDF) - Maxim Integrated

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Fabricante

MAX9636
(Rev.:2011)

3V/5V Low-Power, Low-Noise, CMOS, Rail-to-Rail I/O Op Amps

Maxim Integrated 

3V/5V Low-Power, Low-Noise, CMOS,

Rail-to-Rail I/O Op Amps

For best performance, follow standard high-impedance

layout techniques, which include the following:

U Using shielding techniques to guard against parasitic

leakage paths. For example, put a trace connected to

the noninverting input around the inverting input.

U Minimizing the amount of stray capacitance connect-

ed to op amp’s inputs to improve stability. To achieve

this, minimize trace lengths and resistor leads by

placing external components as close as possible to

the package.

U Use separate analog and digital power supplies.

Applications Information

Shutdown Operation

The MAX9636/MAX9638 feature an active-low shutdown

mode that sends the inputs and output into high imped-

ance and substantially lowers the quiescent current.

Active-Low Input

The shutdown active-low (VIL) and high (VIH) threshold

voltages are designed for ease of integration with digital

controls, such as microcontroller outputs. These thresh-

olds are independent of supply, eliminating the need for

external pulldown circuitry.

Output During Shutdown

The MAX9636/MAX9638 output is in a high-impedance

state while SHDN is low. The device structure limits the out-

put leakage current in this state to 0.01µA when the out-

put is between 0V to VDD.

ADC Driver

The MAX9636/MAX9637/MAX9638 are low-power ampli-

fiers ideal for driving high to medium-resolution ADCs.

Figure 3 shows how the MAX9636 is connected to a pho-

todiode, with the amplifier output connected to additional

signal conditioning/filtering, or directly to the ADC. The

MAX1286–MAX1289 family of low-power, 12-bit ADCs are

ideal for connecting to the MAX9636/MAX9637/MAX9638.

The MAX1286–MAX1289 ADCs offer sample rates up

to 150ksps, with 3V and 5V supplies, as well as 1- and

2-channel options. These ADCs dissipate just 15µA when

sampling at 10ksps and 0.2µA in shutdown. Offered in

tiny 8-pin SOT23 and 3mm x 3mm TDFN packages, the

MAX1286–MAX1289 ADCs are an ideal fit to pair with

the MAX9636/MAX9637/MAX9638 amplifiers in portable

applications.

Similarly, the MAX1086–MAX1089 is a family of 10-bit

pin-compatible low-power ADCs with the same 3V/5V,

1- and 2-channel options. Table 1 details the amplifier and

ADC pairings for single- and dual-channel applications.

PROCESS: BiCMOS

Chip Information

Table 1. Recommended Amplifiers/ADCs

CHANNELS

1

2

2

AMPLIFIER

MAX9636

MAX9637

MAX9638

3V, 10 BIT

MAX1089

MAX1087

MAX1087

3V, 12 BIT

MAX1289

MAX1287

MAX1287

ADC

5V, 10 BIT

MAX1088

MAX1086

MAX1086

5V, 12 BIT

MAX1288

MAX1286

MAX1286

11

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