MAX9939AUB 데이터 시트보기 (PDF) - Maxim Integrated

부품명

상세내역

제조사

MAX9939AUB

SPI Programmable-Gain Amplifier with Input VOS Trim and Output Op Amp

Maxim Integrated 

SPI Programmable-Gain Amplifier

with Input VOS Trim and Output Op Amp

Table 4. Input Offset-Voltage Trim

INPUT OFFSET VOLTAGE

(V4 = 0 TRIMS POSITIVE, V4 = 1 TRIMS NEGATIVE)

V3:V0

0000

VOS (mV)

0

0001

1.3

0010

2.5

0011

3.8

0100

4.9

0101

6.1

0110

7.3

0111

8.4

1000

10.6

1001

11.7

1010

12.7

1011

13.7

1100

14.7

1101

15.7

1110

16.7

1111

17.6

Use of Output Operational Amplifier as TIA

CMOS inputs on the output op amp makes it ideal for

use as an input transimpedance amplifier (TIA) in cer-

tain current-output sensor applications. In such a situ-

ation, keep in mind that the inverting input operates at

fixed voltage of VCC/2. Use a high-value resistor as a

feedback gain element, and use a feedback capacitor

in parallel with this resistor if necessary to aid amplifi-

er stability in the presence of high photodiode or

cable capacitance. The output of this TIA can be rout-

ed to INA+ or INA- for further processing and signal

amplification.

Power-Supply Bypassing

Bypass VCC to GND with a 0.1µF capacitor in parallel

with a 1µF low-ESR capacitor placed as close as possi-

ble to the MAX9939.

Differential-Input, Differential-Output PGA

The output amplifier can be configured so that the

MAX9939 operates as a differential-input, differential-

output programmable gain amplifier. As shown in

Figure 4, use a 10kΩ resistor between OUTA and INB,

and between INB and OUTB. Such a differential-output

configuration is ideal for use in low-voltage applications

that can benefit from the 2X output voltage dynamic

range when compared to single-ended output format.

10 ______________________________________________________________________________________

Share Link: