View HT8665_301159.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

HT8665 Talking Back with Echo
Features
* * * *
*
Single power supply: 4.5V~5.5V ADM algorithm Auto playback with an echo effect DRAM options: - 64K - 256K Sampling rate options: - 32K bps (bits per second) - 16K bps
* * * * * * *
Recording capacity: 2, 4, 8, 16 seconds A built-in 2 stage microphone amplifier A built-in DRAM refresh circuit A voltage type D/A output A current type D/A output Auto power-off Low power dissipation
Applications
* *
Toys Educations
*
Games
General Description
The HT8665 is a single chip CMOS LSI using an ADM algorithm. It is designed for applications on talking back with an echo effect. Functions of the IC consist of recording/playing and auto power off in addition to an echo effect. The IC starts recording when a sound input is detected, and stops to play back when silence lasts 0.5 seconds during recording. The auto power off function is activated once a REC/PLAY cycle has been implemented 64 times or an interval of silence exceeds 2 minutes. The HT8665 provides a recording capacity of 2 seconds at a 32K bps sampling rate for DRAM of 64K (8 seconds for DRAM of 256K) and 4 seconds at a 16K bps sampling rate (16 seconds for DRAM of 256Kb). A higher sampling rate results in sounds of better quality but sacrifices the recording time, and vice versa.
1
21st Dec '95
HT8665
Pin Assignment
A0 RASB WRB DATA 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 A2 A1 A3 A4 A5 NC A6 A7 VSS MS DS TESTB 16KB START AIN1 NC AIN2 AO1 BIAS ADMOUT
Pad Assignment
A8 NC
CASB VDD MOTOR
LEDB IOUT NC VOUT MIXIN
NC NC NC MIXOUT OSC1 OSC2
HT8665 - 40 DIP
Chip size: 3260 x 3080 (m)2 * The IC substrate should be connected to VSS in the PCB layout artwork.
Block Diagram
2
21st Dec '95
HT8665
Pad Coordinates
Pad No.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 Unit: m
X
-1447.00 -1434.00 -1447.00 -1447.00 -1429.50 -1447.00 -1450.00 -1106.50 -813.00 -31.00 296.00 626.00 881.50 1143.50 1447.00 1447.00 1447.00
Y
977.75 648.25 354.75 99.25 -178.75 -1004.75 -1300.75 -1300.75 -1300.75 -1300.75 -1300.75 -1300.75 -1300.75 -1300.75 -1305.75 -965.25 -717.75
Pad No.
18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33
X
1447.00 1447.00 1447.00 1442.00 1447.00 1447.00 1346.00 1020.00 741.00 460.00 181.00 -100.00 -393.00 -674.00 -983.50 -1340.00
Y
-452.75 -189.75 75.25 434.25 718.75 999.75 1300.75 1300.75 1300.75 1300.75 1300.75 1300.75 1300.75 1300.75 1300.75 1300.75
Pin Description
Pin No.
1 2 3 4 5 6 7 8 9
Pin Name I/O
A0 RASB WRB DATA A8 NC CASB VDD MOTOR O O O I/O O -- O I O
Internal Connection
CMOS CMOS CMOS CMOS CMOS -- CMOS -- CMOS
Description
DRAM address output DRAM row address strobe DRAM write enable DRAM data input/output DRAM address output No connection DRAM column address strobe Positive power supply Motor drive output (active high)
10
LEDB
O
LED indicator: NMOS Idle: LED is turned on; Open Drain Record: LED flashes; Play: LED is turned off. PMOS Current type audio output for an external transistor Open Drain
11
IOUT
O
3
21st Dec '95
HT8665
Internal Connection
-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- CMOS Pull-High Pull-Low No connection Voltage type audio output for an external power AMP Echo mixer input No connection No connection No connection Echo mixer output Oscillator input Oscillator output ADM D/A output For OP bias de-coupling Internal AMP first stage output Internal AMP second stage input (inverting) No connection Internal AMP first stage input (inverting) System start pin Sampling rate selection: Open/high: 32K bps; Low: 16K bps For IC test only Echo delay time selection: 1. DRAM of 64K: Open/high: 256ms; Low: 128ms 2. DRAM of 256K: Open/high: 512ms; Low: 256ms DRAM size selection: Open/high: 64K; Low: 256K Negative power supply (GND) DRAM address output DRAM address output No connection DRAM address output
Pin No.
12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29
Pin Name I/O
NC VOUT MIXIN NC NC NC MIXOUT OSC1 OSC2 ADMOUT BIAS AO1 AIN2 NC AIN1 START 16KB TESTB -- O I -- -- -- O I O O O O I -- I O I I
Description
30
DS
I
Pull-High
31 32 33 34 35 36
MS VSS A7 A6 NC A5
I I O O -- O
Pull-High -- CMOS CMOS -- CMOS
4
21st Dec '95
HT8665
Internal Connection
CMOS CMOS CMOS CMOS
Pin No.
37 38 39 40
Pin Name I/O
A4 A3 A1 A2 O O O O
Description
DRAM address output DRAM address output DRAM address output DRAM address output
Absolute Maximum Ratings
Supply Voltage ................................. -0.3V to 6V Input Voltage................. VSS-0.3V to VDD+0.3V Storage Temperature................. -50C to 125C Operating Temperature............... -20C to 70C (Ta=25C)
Electrical Characteristics
Symbol
VDD IOP IOH1 IOH2 IOL VIH VIL VOUT FOSC
Parameter
Operating Voltage Operating Current IOUT Max. Source Current MOTOR Source Current LED Sink Current "H" Input Voltage "L" Input Voltage Max. VOUT Output Voltage System Frequency
Test Condition VDD
-- 5V 5V 5V 5V -- -- 5V 5V
Min.
4.5 -- -1.5 -1 3 0.7VDD 0 -- --
Typ.
-- 3 -3 -3.5 -3.5 -- -- 1.5 1
Max.
5.5 6 -- -- -- VDD 0.3VDD -- --
Unit
V mA mA mA mA V V VP-P MHz
Condition
-- No load, FOSC=1MKHz VOH=0.5V VOH=4.5 VOH=0.5V -- -- RL>50K ROSC=27K
5
21st Dec '95
HT8665
Functional Description
The HT8665 is a single chip LSI with an external DRAM. It is designed for applications on talking back with an echo effect. The recording length of the IC is decided by the data rate along with the size of an external memory. Sounds input from an external microphone are coded through an internal ADM algorithm and saved in an external memory until the memory is full or an interval of silence lasts over 0.5 seconds. Once recording is terminated, the IC will play back the recorded sounds with an echo effect automatically.
DRAM Step Size Estimation D/A + Delay x Accumulator
Play function
The HT8665 stops to play back the recorded sounds when an interval of silence lasts 0.5 seconds or the memory is full during recording. Its playing rate is the same as the rates of recording and echo effect. The echo delay time is settable by the DS pin as shown.
DS DRAM
64Kb 256Kb
Power control
1
256ms 512ms
0
128ms 256ms
Record function
The HT8665 provides a START pin for power control. The START pin is of high impedance and switch Q is turned off at initial. After the START key is triggered, it will output a high level signal and switch Q is turned on. This pin outputs a low level signal and the power of LSI is switched off when a REC/PLAY cycle has been implemented 64 times or an interval of silence lasts over 2 minutes.
Q VDD START VSS
The HT8665 provides 2 kinds of sampling rate as well as DRAM interfaces. The sampling rate (S.R.) along with DRAM determine the recording capacity as shown in the following table: (for FOSC=640 KHz)
MS (DRAM)
1 (64Kb) 1 (64Kb) 0 (256Kb) 0 (256Kb)
16KB (S.R.)
1 (32K bps) 0 (16K bps) 1 (32K bps) 0 (16K bps)
Recording Capacity
2 seconds 4 seconds 8 seconds 16 seconds
Motor
The HT8665 provides a motor driving pin. The motor is turned on during playing but off once talking back is terminated.
Status display
Notes: "1" is connected to VDD or left open. "0" is connected to VSS. Recording starts whenever a sound input is detected. It then stops once silence is detected or the recording capacity is full. After that, talking back comes into play.
The HT8665 provides an LEDB pin to display its operation status.An external LED is switched on when the IC is in the standby state. It, on the other hand, is switched off when the IC is in the playing state. The LED will flash with the sound volume when the IC is in the recording state, but its intensity will vary inversely with the volume.
6 21st Dec '95
HT8665
Flowchart
Begin
Power Off
START Y Power On
N
Idle State, LED On
Voice Input
Y
N
Stay 2 mins Record State, LED Flash
N
Y
Silence or Memory Full Y Play State, LED Off
N
Silence or Memory Full Y Increase Recycle Counter
N
N
Recycle Counter=64 Y
7
21st Dec '95
HT8665
Application Circuits
LM386 output
8
21st Dec '95
HT8665
9
21st Dec '95
HT8665
Two transistor output
10
21st Dec '95
HT8665
11
21st Dec '95
HT8665
LM324 output
12
21st Dec '95
8050 100 8 VDD A1 A2 A3 A4 A5 A6 A7 A8 RASB CASB WRB DATA TESTB VOUT 26 AIN1 AIN2 AO1 OSC1 0.1 500P 100 22 10V MIC 27K 4.7K 30K 19 0.1 23 100K 24 IOUT BIAS VSS OSC2 13 11 22 32 20 0.1 10 10V 20K 200K 3 2 LM324 U1A 1 36K 3900P 27P MIXIN 14 10K 50K 10K 22 10V 0.1 36K ADMOUT 21 20K 10K MIXOUT 18 1K 8050 VCC2 4001 MOTOR 9 DS 30 M MS 31 16KB 28 START 27 10K 8050 LEDB 40 38 37 36 34 33 5 2 7 3 4 29 39 10 5 A0 7 A1 6 A2 12 A3 11 A4 10 A5 13 A6 9 A7 A8 1 1 A0 VDD 8 RASB 4 CASB 15 WRB 3 DI 2 DO 14 5.6V 1K 10 10V 1K START
8550 VCC 9V
64K/256K DRAM
18 VSS
6 5 LM324
U1B
4 7 10 8 9 LM324 U1C 11 43K
8050 8550
HT8665
36K
18K 0.1
100 10V SPK 8
13
21st Dec '95
HT8665

▲Up To Search▲

Price & Availability of HT8665

	To Download HT8665 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .