OPA4364-Q1 Datasheet, PDF (14/21 Pages) Texas Instruments – 1.8-V, 7-MHz, 90-dB CMRR, SINGLE-SUPPLY, RAIL-TO-RAIL I/O OPERATIONAL AMPLIFIER

OPA2364-Q1, OPA4364-Q1
SGLS363A – JUNE 2006 – REVISED OCTOBER 2006
www.ti.com
APPLICATION INFORMATION (continued)
Directly Driving the ADS8324 and the MSP430
The OPAx364 series operational amplifiers are optimized for driving medium speed (up to 100 kHz) sampling
A/D converters. However, they also offer excellent performance for higher-speed converters. The no crossover
input stage of the OPAx364 directly drives A/D converters without degradation of differential linearity and THD.
They provide an effective means of buffering the A/D converters input capacitance and resulting charge
injection, while providing signal gain. Figure 26 and Figure 27 show the OPAx364 configured to drive the
ADS8324 and the 12-bit A/D converter on the MSP430.
V+ = 1.8 V
V+ = 1.8 V
–
OPAx364
V
IN
+
100 W
ADS8324
1 nF
Figure 26. OPAx364 Directly Drives the ADS8324
V+
V+
–
OPAx364
100 Ω
MSP430
V_IN
+
1 nF
Figure 27. Driving the 12-Bit A/D Converter on the MSP430
Audio Applications
The OPAx364 family has linear offset voltage over the entire input common-mode range. Combined with
low-noise, this feature makes the OPAx364 suitable for audio applications. Single-supply 1.8-V operation allows
the OPA2364 to be an optimal candidate for dual stereo-headphone drivers and microphone preamplifiers in
portable stereo equipment (see Figure 28).
Clean 3.3-V Supply
49 kΩ
Electret
Microphone
4 kΩ
3.3 V
OPA2364
+
V_OUT
6 kΩ 5 kΩ
1 µF
Figure 28. Microphone Preamplifier
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