PDF GP520A Data sheet ( Hoja de datos )

Número de pieza	GP520A
Descripción	Programmable Analog Signal Processor
Fabricantes	Gennum
Logotipo
Hay una vista previa y un enlace de descarga de GP520A (archivo pdf) en la parte inferior de esta página. Total 10 Páginas
No Preview Available ! www.DataSheet4U.com GENNUM C␣ ␣ O␣ ␣ R␣ ␣ P␣ ␣ O␣ ␣ R␣ ␣ A␣ ␣ T␣ ␣ I␣ ␣ O␣ ␣ N Programmable Analog Signal Processor FEATURES • programmable parameters - gain - low pass filter - high pass filter - AGC threshold - release time - MPO - receiver bias voltage • on-chip voltage regulator • typical gain 60 dB • voltage drive output stage • telecoil preamp STANDARD PACKAGING • Chip (136 x 110 mils) Au Bump CIRCUIT DESCRIPTION The GP520A is a programmable analog signal path IC designed for use in hearing instruments. The GP520A’s programmable parameters are adjusted by external programming currents, such as generated by the GP521. The GP520A provides a 2.5 µA reference current for use by the GP521. Sixteen settings are possible in the GP521, allowing the Programmable Current Sink (PCS) to sink between 0 and 1.875 x IREF. The GP520A is composed of five functional blocks. The input preamp, a filter block, the AGC block, MPO clipper and the output stage. GP520A - DATA SHEET Principle features of the preamp are the input impedance 100 kΩ and a gain of 14 dB. The programmable filter block is composed of a low pass and high pass filter which generates a range of high and low pass corner frequencies. Although the control current to this block varies linearly, linear to logarithmic conversion is performed internally in order to adjust the corner frequencies logarithmically. Both filters feature a 12 dB/octave rolloff and unity gain. The filters are followed by an AGC block. Up to 35␣ dB of adjustable gain is provided as well as programmable threshold and release time. The attack time of the AGC block remains fixed and is independent of the release time. The output current is driven into the preamp of the clipper, thus, the AGC converts a voltage input into a current output and is therefore, a transconductance block. The next stage is an electronic MPO control peak “clipper” providing electronic clipping of the signal and setting of the maximum output level. The clipper output is also a transconductance block and drives a 40 kΩ resistor (ROUT␣ 8) tied to the supply. The input of the final stage is an inverting operational amplifier. A feedback resistance of 240 kΩ is provided internally and this final stage is thus configured as a voltage drive output stage. The DC bias current through the receiver is also programmable. VREG 13 28 29 A IN 14 V CC A OUT HPFB HP BUFFER BUFFER RECT. LPFB IN OUT IN 9 15 18 19 22 24 26 27 VOLTAGE REGULATOR 50k RIN14 + PREAMP - 40K + HP 2R FILTER - R R + LP FILTER - FULL WAVE RECTIFIER CAGC 1 AVERAGING CIRCUIT CCOMPDOEULTTA BIN 31 3 5 THRESHOLD BOUT CCLIP 7 30 V cc ROUT 8 AGC VC AMP CLIPPER COUT 8 10 DIN RF R 10K LIN/LOG CONVERTER LIN/LOG CONVERTER 12 6 P GND GND 20 I HP 21 I LP All resistors in ohms, all capacitors in farads unless otherwise stated. I REF 16 I REF 25 I REL LIN/LOG CONVERTER 2 23 I THRESH I GAIN 4 I CLIP - OUTPUT + VBIAS 17 I BIAS 11 DOUT Revision Date: May 1998 FUNCTIONAL BLOCK DIAGRAM Document No. 510 - 78 - 06 GENNUM CORPORATION P.O. Box 489, Stn. A, Burlington, Ontario, Canada L7R 3Y3 tel. +1 (905) 632-2996 Web Site: www.gennum.com E-mail: [email protected] 1 page 2n2 2n2 V CC 9 A OUT HPFB 15 18 HP 19 3µ3 13 VOLTAGE REGULATOR AIN 14 10µ RIN14 + PREAMP - 40K + HP 2R FILTER - 680p 1n5 TP 68n LPFB BUFFER OUT 22 24 BUFFER IN 26 27 R + LP FILTER - R 10n 10n 68n 10K 1 31 30 5 BIN BOUT VCC 7 2k2 11 DOUT R 10K 0.6V LIN/LOG CONVERTER 12 6 P GND GND 20 I HP PINK NOISE GENERATOR I HP 0.6 V LIN/LOG CONVERTER 21 I LP I LP All resistors in ohms, all capacitors in farads, unless otherwise stated. Fig. 4 AC Test Circuit for High & Low Pass Filters 10k 10k IHP = 1.875 x IR 1k 100 80 0 0.25 0.5 0.75 1 1.25 1.5 1.75 NORMALIZED I HP / I R CURRENT 2 Fig. 5 High Pass Filter Corner Frequency vs IHP Current (Note 1) (Fig.4 Test Circuit) 1k 700 0 0.25 0.5 0.75 1 1.25 1.5 1.75 NORMALIZED I HP / I R CURRENT 2 Fig. 6 Low Pass Filter Corner Frequency vs ILP Current (Note 1) (Fig.4 Test Circuit) NOTES: 1. Corner frequency calculated in reference to signal at 3 kHz 5 510 - 78 - 06 5 Page

Páginas	Total 10 Páginas
PDF Descargar	[ Datasheet GP520A.PDF ]

Hoja de datos destacado

Número de pieza	Descripción	Fabricantes
GP520A	Programmable Analog Signal Processor	Gennum

Número de pieza	Descripción	Fabricantes
SLA6805M	High Voltage 3 phase Motor Driver IC.	Sanken
SDC1742	12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters.	Analog Devices

DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares,
permitiéndote verlos en linea o descargarlos en PDF.

DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar