Tel: 886-2-66296288
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
8-Bit D/A Converter IC
PT8214
DESCRIPTION
PT8214 is an 8-bit D/A Converter IC with operational amplifier output buffers. It supports up to a
maximum of 36 channels and provides two reference voltages which enable its 36 channels to be
used as 12 and 24 independent channels. Digital data are inputted in serially and is controlled by the
CLK and STB Pins making a cascading connection between devices. Available in 48 pins, LQFP
package, PT8214 is capable of large current drive since each channel has an operational amplifier
output buffer. Pin assignments and application circuit are optimized for easy PCB Layout and cost
saving advantages.
FEATURES
•
•
•
•
•
•
•
•
•
•
CMOS technology
Very low power consumption: Type 1.1mW/channel
Max. 2.5MHz serial data input
Separate supply voltages for digital and analog blocks
R-2R resistor ladder conversion method
On-chip operational amplifier output buffers: Max. +1.0/-1.0mA analog output sink/source current
capability
Analog data output range: 0 to Vcc (V)
Two analog output reference voltage
Analog data can be outputted in different reference voltages
Available in 48 pins, LQFP package
APPLICATIONS
•
•
•
•
•
•
Digital equipment
V8
CD ROM/VCD
MPEG
Sound card
Replacement for potentiometers
PT8214 V1.0
-1-
January, 2006
Tel: 886-2-66296288
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
8-Bit D/A Converter IC
PT8214
BLOCK DIAGRAM
DI
CLK
14-Bit Shift Register *1
D13 D12 D11 D10 D9 D8 D7 D6
D5 D4 D3 D2 D1 D0
DO
Channel Decoder
1
36
STB
VDD1
1
8-Bit
Register
R-2R Type 8-Bit
D/A Converter
+
AO1
24
8-Bit
Register
R-2R Type 8-Bit
D/A Converter
+
AO24
VSS1
VDD2
25
8-Bit
Register
R-2R Type 8-Bit
D/A Converter
+
AO25
VCC
GND
30
8-Bit
Register
R-2R Type 8-Bit
D/A Converter
+
AO30
31
8-Bit
Register
R-2R Type 8-Bit
D/A Converter
+
AO31
36
8-Bit
Register
R-2R Type 8-Bit
D/A Converter
+
AO36
VSS2
Note: *1=14-Bit Shift Register with an MSB-First format.
PT8214 V1.0
-2-
January, 2006
Tel: 886-2-66296288
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
8-Bit D/A Converter IC
PT8214
PIN CONFIGURATION
AO11
AO10
48
47
46
45
44
43
42
41
40
39
38
37
AO9
AO8
AO7
AO6
AO5
AO4
AO3
AO2
AO1
AO36
DI 1
CLK 2
STB 3
DO 4
GND 5
NC 6
VSS1 7
VDD1 8
AO 12 9
AO 13 10
AO 14 11
AO 15 12
PT8214
36
35
34
33
32
31
30
29
28
27
26
25
AO35
AO34
AO33
AO32
VSS2
VDD2
NC
VCC
AO31
AO30
AO29
AO28
PT8214 V1.0
AO 16
AO 17
AO 18
AO 19
AO 20
AO 21
AO 22
AO 23
AO 24
AO 25
AO 26
AO 27
13
14
15
16
17
18
19
20
21
22
23
24
-3-
January, 2006
Tel: 886-2-66296288
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
8-Bit D/A Converter IC
PT8214
PIN DESCRIPTION
Pin Name
DI*
CLK*
STB*
DO
GND
NC
VSS1
VDD1
AO12 to AO24
AO25 to AO27
AO28 to AO31
VCC
VSS2
AO32 to AO36
AO1 to AO11
I/O
I
I
I
O
-
-
-
-
O
O
O
-
-
O
O
Description
Serial data input pin
Shift clock input pin
Serial data input from the DI pin are inputted to the internal shift
register at the rising edge of the CLK signal.
Load strobe input pin
When this pin is “High”, the shift register contents are loaded into
the decoder and 8-bit register.
Serial data output pin
The serial data in the shift register are outputted from this pin.
This pin allows a cascade connection.
Ground
No connection
D/A converter ground pin (for AO1 to AO24 outputs)
D/A converter supply voltage (for AO1 to AO24 outputs)
D/A converter output pin #1
D/A converter output pin #2
D/A converter output pin #2
Digital block & operational amplifier output buffer supply voltage
(for AO25 to AO36 outputs)
D/A converter ground pin (for AO25 to AO36 outputs)
D/A converter output pin #2
D/A converter output pin #1
Pin No.
1
2
3
4
5
6, 30
7
7
9 to 21
22 to 24
25 to 28
29
32
33 to 37
38 to 48
Note: *=DI, CLK & STB must be fixed at low level when there is no data transfer.
PT8214 V1.0
-4-
January, 2006
Tel: 886-2-66296288
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
8-Bit D/A Converter IC
PT8214
FUNCTION DESCRIPTION
PT8214 is an 8-bit D/A Converter IC which provides 14 bits shift register for digital data storage and
channel selection. The 14 bits shift register are shown below.
Last
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
First
D13
D/A Converter
The D/A converter output are given in the table below.
Input data
D0
D1
D2
D3
D4
D5
D6
D7 DAC Output
0
0
0
0
0
0
0
0
≅V
SS
1
0
0
0
0
0
0
0
≅VREF/256x1+V
SS
：
：
：
：
：
：
：
： ：
：
：
：
：
：
：
：
： ：
：
：
：
：
：
：
：
： ：
0
1
1
1
1
1
1
1
≅VREF/256x254+V
SS
1
1
1
1
1
1
1
1
≅VREF/256x255+V
SS
Note: VREF=VDD-V
SS
The channel selection table is given below.
Input data
D8
D9 D10 D11 D12 D13 Selected channel
0
0
0
0
0
0
Not selected
0
0
0
0
0
1
AO1 to AO30 selected
0
1
1
1
1
0
0
1
1
1
1
1
AO31 to AO36 selected
1
0
0
1
0
0
1
0
0
1
0
1
Not selected
1
1
1
1
1
1
Channel
PT8214 V1.0
-5-
January, 2006
测试/测量
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