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Delphi Open Port Seven Band Equalizer

When controlled by serial data, the Delphi Open Port Graphic Equalizer (OPEQ7) IC provides for seven bands of equalization. The exploitation of transconductance-C circuit techniques minimizes the number of external components required. The seven bands are fully integrated bandpass filters with +/-12dB boost and cut ranges. Band center frequencies are located at 40 Hz, 100 Hz, 250 Hz, 1.6 kHz, 4 kHz, and 12 kHz. Each band is independently controlled via serial data words.

Features

Seven bands of tone control and frequency shaping with symmetrical boost and cut
Bowing is less than 4dB with all bands boosted at +12dB
Automatic input attenuation

Packaging

16-pin 300-mil wide SO

Typical Applications

Automotive Radios
Home Receivers and Equalizers
Portable Stereo Systems

Recommended Operating Conditions
Characteristic	Symbol	Value	Unit
Supply Voltage	Vdd, Vd	8.3 to 8.7	V
Digital Input Low Voltage	Vin	0.8	V (max)
Digital Input High Voltage	Vin	3.0	V (min)
Input Voltage-Audio	Vin	2.37	Vrms (max)
Operating Temp. Range, Ambient	Ta	-40 to 85	°C

Absolute Maximum Ratings
Characteristic	Symbol	Value	Unit
Supply Voltage	Vdd, Vd	-0.4 to 9.5	V
Digital Input Voltage	Vin	-0.3 to Vd+0.3	V
Storage Temp. Range	Tstg	-65 to +150	V
Max. Junction Temp.	Tj	150	V
Max. IC Power Dissipation		350	mV

Electrical Performance Characteristics - OPEQ7
Characteristics	Symbol	Condition	Min	Max	Unit
Adjacent Step Offset Voltage	Vaso	No Input Signal, Compare each output between consecutive equalizer steps	-3.0	3.0	mV
Equalizer Step Linearity	Veql	For all EQ Bands Ex: (Gain(2dB)-Gain(4dB))/Avg. Step Avg. Step=(Gain(12dB)-Gain(-12dB))/12	0.65	1.35	dB/dB
Equalizer Bowing	Vbow	Input=0.5Vrms @ 1.66kHz, Ratio Response with all bands at +12dB to Response with only 1.6kHz band at +12dB, other bands flat	1	4	dB
Total Harmonic Distortion	Vhd	Input=1.0Vrms @ 1kHz, All EQ bands=2.0dB		0.1	%
Noise	Vn	With EQ bands flat		50	µV

Delphi Open Port Seven Band Equalizer (48k)