HL7005 (Echo / Surround)

GENERAL DESCRIPTION

HL7005 is a monolithic CMOS IC, used in audio processing system. It can be used as echo or surround audio system. In this circuit, it consists of control circuit, ADC, DAC and digital delay system. The delay time can be controlled by a micro roller or manual setting or analog variable resistor. A VCO circuit is included in the circuit, and can be adjusted to the suitable frequency. Fade-out, muting and Fade-in circuit is designed in the circuit. The delay signal can be changed smoothly by the circuit. Also two operational amplifiers are built in the circuit, to reduce the cost of the system.  

FEATURES

  • Linear phase
  • External adjustable VCO
  • Two kinds of delay time range setting
    • a. digital setting: by microcomputer mode or easy mode
    • b. analog setting: (used in easy mode) 32 ranges set by an analog adjustable resistor
  • Low noise
  • Low distortion: linear phase
  • Wide range time delay settings
    • a. digital setting echo mode: from 20 msec to 164 msec (8 steps) surround mode: from 5 msec to 41 msec (8 steps)
    • b. analog setting echo mode: from 5 msec to 164 msec (32 steps) surround mode: from 1 msec to 41 msec (32 steps)
  • UP / manual control mode setting and time delay
  • Auto muting
  • Power on reset
  • Built-in dual microphone operational amplifier

ABSOLUTE MAXIMUM RATING

  • Power Supply ----------------------------- 6V
  • Input Voltage ------------------------------ (VSS - 0.3V) to (VDD + 0.3V)
  • Operating Temperature -------------------- -20。C to 70。C
  • Storage Temperature ---------------------- - 25。C to 125。C

ELECTRICAL CHARACTERISTICS

SYMBOL

DESCRIPTION

TEST CONDITION

MIN

TYP

MAX

UNITS

  V CC Analog Supply Voltage     4.5   5.0   5.5   V
  V DD Digital Supply Voltage       4.5   5.0   5.5   V  
  V IL   Input Voltage Low   VDD = 5V   _     _   0.3VDD  
  V IH   Input Voltage High   VDD = 5V   0.7VDD   _   _  
  I OP Operating Current         25     mA

PIN DESCRIPTION

PIN NO.

PIN NAME

FUNCTIONAL DESCRIPTION

1 VCC Analog positive power supply
2 VREF Analog reference voltage
3 AGND Analog ground
4 DGND Digital ground
5 DELAY ADJ Analog delay time adjust input. ( used in easy mode ) When left floating, the delay time will be determined by digital delay time setting inputs : DEL1, DEL2 and DEL3
6 OSCI Oscillator frequency adjust input
7 uCOM/EASY uCOM mode – serial data control  ( when connected  to VDD )EASY mode – paralle l data control  ( when connected to GND ) 
8 VDD Digital positive power supply
9 TEST Test input pin.  Normal low input.
10 MODE VDD : Echo mode GND : Surround mode
11 REQ/DEL1 In uCOM mode, this input defines data request signal; in easy mode, this input defines delay time 1.
12 SECK/DEL2 In uCOM mode, this input defines clock input; in easy mode, this input defines delay time 2.
13 Sedata/DEL3 In uCOM mode, this input defines serial data input; in easy mode, this input defines delay time 3.
14 MUTEP When MUTEP = VDD, delay signal is muted
15 IP1 The non-inverting input of operational amplifier 1
16 IN1 The inverting input of operational amplifier 1
17 OUT1 The output of operational amplifier 1
18 OUT2 The output of operational amplifier 2
19 IP2 The non-inverting input of operational amplifier 2
20 IN2 The inverting input of operational amplifier 2
21 NC No connection
22 OP2 OUT Delayed signal l output
23 LPF2 IN Low pass filter 2 input
24 LPF2 OUT Low pass filter 2 output
25 NC No connection
26 ECHO FB Echo feedback pin.  In echo mode, it can be used to adjust the level of echo signal
27 LPF1 OUT Low pass filter 1 output
28 LPF1 IN Low pass filter 1 input

APPLICATION CIRCUIT

PIN CONNECTION DIAGRAM

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