Texas Instruments PGA2505EVMV2, User Manual

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1 Product Overview
The PGA2505 is a digitally-controlled, microphone preamplifier integrated circuit designed for amplifying the
output of dynamic and condenser microphones and driving high-performance audio analog-to-digital converters
(ADCs).
Figure 1-1 shows a functional block diagram of the PGA2505.
SERIAL PORT
and
LOGIC CONTROL
PGA
DC
Servo
CS1
CS2
GPO1
GPO2
GPO3
GPO4
V
IN+
V
IN–
AGND
VA+
VA–
CS
SCLK
SDI
SDO
OVR
V
COM
IN
V
OUT+
V
OUT–
DGND
VD–
Figure 1-1. PGA2505 Functional Block Diagram
The analog input to the preamplifier is provided differentially at the VIN+ and VIN− inputs (pins 24 and 23,
respectively). The programmable gain amplifier can be programmed to either pass through the signal at unity
gain, or apply 9 dB to 60 dB of gain to the input signal. The gain of the amplifier is adjustable over the full 9-dB
to 60-dB range in 3-dB steps. The differential output of the PGA2505 is made available at VOUT+ and VOUT−
(pins 15 and 14, respectively). Gain is controlled using a
MSP430F5529 microcontroller and PGA2505EVMV2
graphical user interface (GUI), which can be accessed here . The microcontroller and GUI are used to program
the PGA2505 gain and support functions, as shown in Figure 1-2 .
www.ti.com Product Overview
SBOU259 – OCTOBER 2021
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