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PDF MAS9188 Data sheet ( Hoja de datos )
| Número de pieza | MAS9188 | |
| Descripción | 12 X 8-Bit D to A Converter | |
| Fabricantes | MAS | |
| Logotipo |  |
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DA9188.002
23 February 2005
MAS9188
12 × 8-Bit D to A Converter
• 3-Pin Serial Data Interface
• Low Voltage Output Buffer
• Replaces 12 Potentiometers
• Individually Programmable
Outputs
• Fully Operational Down to 1.2 V
DESCRIPTION
MAS9188 is 12-channel 8-bit DAC, designed
primarily for trimmer replacement. The device is
controlled by a simple 3-line input.
FEATURES
• Twelve 8-Bit DACs on a Single Monolithic Chip
• Voltage Level Output
• TSSOP-20 Package
• Single, Low +1.2 V Supply
• Power-On Reset
• Functionally and Pin Compatible with
AD8802/AD8804
BLOCK DIAGRAM
The DAC is selected with the four first bits in the
serial input data (SDI-pin) and the DAC output value
is set according to the last 8 bits in the serial input
data.
APPLICATIONS
• High Resolution Monitors
• Automatic Gain Control
• Trimmer Replacement
• Portable and Battery-Operated Equipment
SDI
CLK
12-bit
Shift
Register
8-bit data
XCS
Address
Decoder
VREFHVREFL VDD GND
8-BIT DAC
8-BIT DAC
8-BIT DAC
8-BIT DAC
8-BIT DAC
8-BIT DAC
8-BIT DAC
8-BIT DAC
8-BIT DAC
8-BIT DAC
8-BIT DAC
8-BIT DAC
O12
O11
O10
O9
O8
O7
O6
O5
O4
O3
O2
O1
1 (10)
1 page  
DA9188.002
23 February 2005
OPERATING MODES
DAC maximum output voltage is set using VREFH and VREFL pins (= 255/256 * (VREFH-VREFL)+VREFL)
(note: VREFL = GND in case of MAS9188A1). The XRESET pin is used for middle code preset: DAC registers
are reset and middle code will appear at the DAC output.
Serial input data is written to SDI while XCS is low. Data is read at CLK rising edge to on-chip shift register.
Rising XCS-pin reads data and 12 CLK-cycles are used as the input data (4 address bits and 8 data bits). The
last 12 bits before rising XCS are used as input data.
◆ Timing diagram
SDI A3 A2 A1 A0 D7 D6 D5 D4 D3 D2 D1 D0
CLK
XCS
DAC Register Load
VOUT
APPLICATION AND TEST CIRCUIT INFORMATION
+3.0v
Controller
Power On/Off
Clock
Data In
Chip Select
100 nF
20
VDD
1
VREFH
MAS9188A2
8 XSHDN
O12
12
CLK
13 SDI
9 XCS
O11
O10
O9
O8
O7
O6
O5
O4
O3
O2
O1
GND
10
VREFL
11
19
18
17
16
15
14
7
6
5
4
3
2
5 (10)
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet MAS9188.PDF ] | |
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