Tel: 886-2-66296288
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
6-Channel Electronic Volume Controller IC
PT2258
DESCRIPTION
PT2258 is a 6-Channel Electronic Volume Controller IC utilizing CMOS Technology specially designed
for the new generation of AV Multi-Channel Audio System. PT2258 provides an I
2
C Control Interface,
an attenuation range of 0 to -79dB at 1dB/step, low noise, and high channel separation. Housed in 20
pins, DIP or SOP, PT2258’s pin assignments and application circuit are optimized for easy PCB Layout
and cost saving advantages.
FEATURES
•
•
•
•
•
•
•
•
•
•
•
CMOS Technology
Low Power Consumption
Least External Components
Attenuation Range: 0 to -79dB at 1dB/step
Operating Voltage: 5 to 9 V
Low Noise, S/N Ratio>100dB (A-weighting)
High Channel Separation
I
2
C Bus Control Interface
Selectable Address
6-Channel Outputs
Available in 20 pins, DIP or SOP
APPLICATIONS
•
•
•
•
•
AV Surround Audio Equipment
Car Audio
Mini Compo
Computer Multi-Media Speaker
Other Audio Equipments
PT2258 V1.2
-1-
July, 2005
Tel: 886-2-66296288
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
6-Channel Electronic Volume Controller IC
PT2258
BLOCK DIAGRAM
IN1
10 dB /S t ep
1d B/ s t e p
+
-
OUT 1
Ref
1d B/s te p
10 dB /S t ep
+
-
OUT 2
IN2
IN3
1d B/ s t e p
10 dB /S t ep
+
-
OUT 3
Ref
1d B/s te p
10 dB /S t ep
+
-
OUT 4
IN4
IN5
10 dB /S t ep
1d B/s te p
+
-
OUT 5
Ref
1d B/ s t e p
10 dB /S t ep
+
-
OUT 6
Vc c
IN6
COD E1
COD E2
C ontr ol unit
Ref
+
-
REF
DGN D
SDA
SCL
GND
PT2258 V1.2
-2-
July, 2005
Tel: 886-2-66296288
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
6-Channel Electronic Volume Controller IC
PT2258
PIN CONFIGURATION
IN1
IN2
IN3
CODE 2
DGND
SCL
SDA
IN4
IN5
IN6
1
2
3
4
5
6
7
8
9
10
P T 2 25 8
20
19
18
17
16
15
14
13
12
11
OUT 1
OUT 2
OUT 3
CODE 1
VCC
REF
GND
OUT 4
OUT 5
OUT 6
PT2258 V1.2
-3-
July, 2005
Tel: 886-2-66296288
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
6-Channel Electronic Volume Controller IC
PT2258
PIN DESCRIPTION
Pin Name
IN1
IN2
IN3
CODE2
DGND
SCL
SDA
IN4
IN5
IN6
OUT6
OUT5
OUT4
GND
REF
VCC
CODE1
OUT3
OUT2
OUT1
I/O
I
I
I
-
-
I
I
I
I
I
O
O
O
-
-
-
-
O
O
O
Description
Channel Input No. 1.
Connect a Capacitor to Audio Source
Channel Input No. 2
Connect a Capacitor to Audio Source
Channel Input No. 3
Connect a Capacitor to Audio Source
Refer to Address Code Section
Digital Ground
I
2
C Clock Input
I
2
C Data Input
Channel Input No. 4
Connect a Capacitor to Audio Source
Channel Input No. 5
Connect a Capacitor to Audio Source
Channel Input No. 6
Connect a Capacitor to Audio Source
Channel Output No. 6
Connect a Capacitor to the Next Stage
Channel Output No. 5
Connect a Capacitor to the Next Stage
Channel Output No. 4
Connect a Capacitor to the Next Stage
Ground 14
Reference Voltage= 1/2 Vcc
Connect a Capacitor to the Ground
Power Supply Input 16
Refer to the Address Code Section
Channel Output No. 3
Connect a Capacitor to the Next Stage
Channel Output No. 2
Connect a Capacitor to the Next Stage
Channel Output No. 1
Connect a Capacitor to the Next Stage
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
PT2258 V1.2
-4-
July, 2005
Tel: 886-2-66296288
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
6-Channel Electronic Volume Controller IC
PT2258
FUNCTION DESCRIPTION
BUS INTERFACE
Data are transmitted to and from the microprocessor to the PT2258 via the SDA and SCL. The SDA
and SCL make up the BUS Interface. It should be noted that the pull-up resistors must be connected to
the positive supply voltage.
DATA VALIDITY
A data on the SDA Line is considered valid and stable only when the SCL Signal is in HIGH State. The
HIGH and LOW States of the SDA Line can only change when the SCL signal is LOW. Please refer to
the figure below.
D ATA
CLK
D a t a Lin e
S ta b le ,
D a t a Va lid
D a ta
C h a ng e
A llo w e d
START AND STOP CONDITIONS
A Start Condition is activated when
1. the SCL is set to HIGH and
2. SDA shifts from HIGH to LOW State.
The Stop Condition is activated when
1. SCL is set to HIGH and
2. SDA shifts from LOW to HIGH State.
Please refer to the timing diagram below.
CLK
DATA
Start
Stop
BYTE FORMAT
Every byte transmitted to the SDA Line consists of 8 bits. Each byte must be followed by an
Acknowledge Bit. The MSB is transmitted first.
PT2258 V1.2
-5-
July, 2005
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