The GM3008 hybrid contains two of Sound Design Technologies' proprietary integrated circuits, the GP537 preamplifier and the GS551 Class B output amplifier. This configuration provides up to 80dB (typ) of electrical gain.
Low total harmonic distortion and input noise make this circuit well suited for high power applications. Various additional pads are provided to allow for maximum flexibility of system performance.
The GP537 contains the following blocks:
Two low-noise inverting preamplifiers with an open
loop voltage gain of typically 50dB
Telecoil preamplifier with its own reference voltage
that enables for direct coupling of the telecoil
Voltage regulator with typically 74dB of supply
rejection capable of working with a supply voltage
down to 1.1 volts
This chip also enables the user to disconnect the
telecoil preamplifier when it is not required, thereby
saving approximately 85 μA of current.
The GS551 class B amplifier contains three basic
blocks:
Low noise inverting preamplifier
Unity gain phase splitter
Fixed gain class B output stage
Features
Up to 80dB of electrical gain
Dedicated preamp for a telecoil
Direct coupling of a telecoil to preamp
Low input referred noise
On-chip voltage regulator
Capable of driving low impedance receivers
Standard Packaging
Hybrid typical dimensions:
0.250 in x 0.150 in x 0.115 in
(6.35 mm x 3.81 mm x 2.92 mm)
Block Diagram
To see this Block Diagram in higher resolution please click on the image.
