MAX9632 データシートの表示（PDF） - Maxim Integrated

部品番号

コンポーネント説明

メーカー

MAX9632

36V, Precision, Low-Noise, Wide-Band Amplifier

Maxim Integrated 

36V, Precision, Low-Noise,

Wide-Band Amplifier

Detailed Description

The MAX9632 is designed in a new 36V, high-speed

complementary BiCMOS process that is optimized for

excellent AC dynamic performance combined with high-

voltage operation.

The IC offers precision, high-bandwidth, ultra-low noise

and exceptional distortion performance.

The IC is unity-gain stable and operates either with

single-supply voltage up to 36V or with dual supplies up

to Q18V.

Applications Information

Operating Supply Voltage

The IC can operate with dual supplies from Q2.25V to

Q18V or with a single supply from +4.5V to +36V with

respect to ground. Even though the IC supports high-

voltage operation with excellent performance, the device

can also operate in very popular applications at 5V.

Low Noise and Low Distortion

The IC is designed for extremely low-noise applications

such as professional audio equipment, very high perfor-

mance instrumentations, automated test equipment, and

medical imaging. The low noise, combined with fast set-

tling time, makes it ideal to drive high-resolution sigma-

delta or SARs analog-to-digital converters.

The IC is also designed for ultra-low-distortion perfor-

mance. THD specifications in the Electrical Characteristics

table and Typical Operating Characteristics are calcu-

lated up to the fifth harmonic. Even when driving high-

voltage swing up to 10VP-P, the IC maintains excellent low

distortion operation over and above 100kHz of bandwidth.

Rail-to-Rail Output Stage

The output stage swings to within 50mV (typ) of either

power-supply rail with a 10kI load and provides a

55MHz GBW with a 30V/s slew rate. The device is

unity-gain stable and can drive a 100pF capacitive

load without compromising stability. Stability with higher

capacitive loads can be improved by adding an isola-

tion resistor in series with the op-amp output. This resis-

tor improves the circuit’s phase margin by isolating the

load capacitor from the amplifier’s output. The Typical

Operating Characteristics show a profile of the isolation

resistor and capacitive load values that maintain the

device into the stable region.

Figure 1. Input Protection Circuit

Input Differential Voltage Protection

During normal op-amp operation, the inverting and nonin-

verting inputs of the IC are at essentially the same voltage.

However, either due to fast input voltage transients or

other fault conditions, these inputs can be forced to be

at two different voltages.

Internal back-to-back diodes protect the inputs from an

excessive differential voltage (Figure 1). Therefore, IN+

and IN- can be any voltage within the range shown in the

Absolute Maximum Ratings section. Note the protection

time is still dependent on the package thermal limits.

If the input signal is fast enough to create the internal

diodes’ forward bias condition, the input signal current

must be limited to 20mA or less. If the input signal cur-

rent is not inherently limited, an input series resistor can

be used to limit the signal input current. Care should be

taken in choosing the input series resistor value, since it

degrades the low-noise performance of the device.

Shutdown

The shutdown is referenced to the positive supply. See

the Electrical Characteristics table for the proper levels

of functionality. A high level (above VCC - 0.35V) disables

the op amp and puts the output into a high-impedance

state. A low level (below VCC - 3V) enables the device. As

an example, if the op amp is powered with dual supplies

of Q15V, the device is enabled when shutdown is at or

below 12V. The device is disabled when shutdown is at

or above 14.65V. If the op amp is powered with a single

supply of 36V, the device is enabled when shutdown is at

or below 33V. The device is disabled when shutdown is at

or above 35.65V. This input must be connected to a valid

high or low voltage and should not be left disconnected.

Power Supplies and Layout

The MAX9632 can operate with dual supplies from

Q2.25V to Q18V or with a single supply from +4.5V to

+36V with respect to ground. When used with dual

supplies, bypass both VCC and VEE with their own

0.1FF capacitor to ground. When used with a single

supply, bypass VCC with a 0.1FF capacitor to ground.

8  _______________________________________________________________________________________

Share Link: