Texas Instruments PGA2505 Evaluation Module PGA2505EVM PGA2505EVM 데이터 시트
제품 코드
PGA2505EVM
1.5
FCC Warning
2
Introduction
2.1
PGA2505 Product Overview
SERIAL
PORT and
LOGIC
CONTROL
CS
SCLK
SDI
SDO
OVR
V
IN
COM
V
+
OUT
V
-
OUT
VD-
PGA
DC
Servo
C
(2)
S1
C
S2
V +
IN
V -
IN
AGND
VA-
VA+
DGND
Gain Range
(1)
GPO1
GPO2
GPO3
GPO4
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Introduction
This equipment is intended for use in a laboratory test environment only. It may generate, use, or radiate
radio frequency energy and has not been tested for compliance with the limits of computing devices
pursuant to subpart J of part 15 of the FCC regulations, which are designed to provide reasonable
protection against radio frequency interference. Operation of this equipment in other environments may
cause interference with radio communications, in which case the user at his own expense will be required
to take whatever measures may be required to correct this interference.
radio frequency energy and has not been tested for compliance with the limits of computing devices
pursuant to subpart J of part 15 of the FCC regulations, which are designed to provide reasonable
protection against radio frequency interference. Operation of this equipment in other environments may
cause interference with radio communications, in which case the user at his own expense will be required
to take whatever measures may be required to correct this interference.
This chapter provides a brief technical overview for the PGA2505 digitally-controlled microphone
preamplifier, as well as a general description and feature list for the PGA2505EVM.
preamplifier, as well as a general description and feature list for the PGA2505EVM.
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
(A/D) converters. A functional block diagram of the PGA2505 is shown in
the output of dynamic and condenser microphones and driving high-performance audio analog-to-digital
(A/D) converters. A functional block diagram of the PGA2505 is shown in
.
(1)
Gain Range: 0dB, or +9dB to +60dB (3dB/step).
(2)
C
S1
and C
S2
are external dc servo integrator capacitors, and are connected across the C
S11
/C
S12
and
C
S21
/C
S22
pins, respectively.
Figure 1. PGA2505 Functional Block Diagram
The analog input to the preamplifier is provided differentially at the V
IN
+ and V
IN
– inputs (pins 24 and 23,
respectively). The programmable gain amplifier can be programmed to either unity gain, or adjustable over
the full 9dB to 60dB range in 3dB steps. The differential output of the PGA2505 is made available at
V
the full 9dB to 60dB range in 3dB steps. The differential output of the PGA2505 is made available at
V
OUT
+ and V
OUT
– (pins 15 and 14, respectively). Gain is controlled using a serial port interface (SPI).
SBOU078 – June 2009
PGA2505EVM
3