Datasheet
Table Of Contents
- FEATURES
- APPLICATIONS
- DESCRIPTION
- ABSOLUTE MAXIMUM RATINGS
- THERMAL INFORMATION
- ELECTRICAL CHARACTERISTICS
- PIN CONFIGURATIONS
- TIMING DIAGRAM
- TIMING REQUIREMENTS
- TYPICAL CHARACTERISTICS: DAC at AVDD = 5.5 V
- TYPICAL CHARACTERISTICS: DAC AT AVDD = 3.6 V
- TYPICAL CHARACTERISTICS: DAC AT AVDD = 2.7 V
- THEORY OF OPERATION
- DIGITAL-TO-ANALOG CONVERTER (DAC)
- RESISTOR STRING
- OUTPUT AMPLIFIER
- TWO-WIRE, I2C-COMPATIBLE INTERFACE
- DACx578 I2C UPDATE SEQUENCE
- POWER-ON RESET TO ZERO-SCALE OR MIDSCALE
- LDAC FUNCTIONALITY
- POWER-DOWN COMMANDS
- CLEAR CODE REGISTER AND CLR PIN
- SOFTWARE RESET FUNCTION
- OPERATING EXAMPLES: DAC7578
- Example 1: Write Mid Scale to Data Buffer A and Update Channel A Output
- Example 2: Power-Down Channel B, C, and H with Hi-Z Output
- Example 3: Read-back the value of the input register of DAC Channel G
- Example 4: Write multiple bytes of data to Channel F. Write Full Scale and then Quarter Scale to Channel F
- Example 5: Write Mid Scale and then Full Scale to all DAC channels.
- APPLICATION INFORMATION
- PARAMETER DEFINITIONS
- Revision History
DAC5578
DAC6578
DAC7578
SBAS496A –MARCH 2010–REVISED AUGUST 2010
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Table 14. Control Matrix for Write Commands (see Table 10, Table 11, and Table 12 for 8-bit, 10-bit, and 12-bit mapping)
COMMAND AND ACCESS BYTE MOST SIGNIFICANT DATA BYTE LEAST SIGNIFICANT DATA BYTE DESCRIPTION
C3 C2 C1 C0 A3 A2 A1 A0 DATA[7:0] X X X X X X X X General data format for 8-bit DAC5578
C3 C2 C1 C0 A3 A2 A1 A0 DATA[9:2] D1 D0 X X X X X X General data format for 10-bit DAC6578
C3 C2 C1 C0 A3 A2 A1 A0 DATA[11:4] D3 D2 D1 D0 X X X X General data format for 12-bit DAC7578
Write to DAC Input Register
0 0 0 0 0 0 0 0 Data[11:4] Data[3:0] X X X X Write to DAC input register of channel A
0 0 0 0 0 0 0 1 Data[11:4] Data[3:0] X X X X Write to DAC input register of channel B
0 0 0 0 0 0 1 0 Data[11:4] Data[3:0] X X X X Write to DAC input register of channel C
0 0 0 0 0 0 1 1 Data[11:4] Data[3:0] X X X X Write to DAC input register of channel D
0 0 0 0 0 1 0 0 Data[11:4] Data[3:0] X X X X Write to DAC input register of channel E
0 0 0 0 0 1 0 1 Data[11:4] Data[3:0] X X X X Write to DAC input register of channel F
0 0 0 0 0 1 1 0 Data[11:4] Data[3:0] X X X X Write to DAC input register of channel G
0 0 0 0 0 1 1 1 Data[11:4] Data[3:0] X X X X Write to DAC input register of channel H
0 0 0 0 1 X X X X X X X X X X X X X X X X X X X Invalid code, no action performed
0 0 0 0 1 1 1 1 Data[11:4] Data[3:0] X X X X Broadcast mode, write to all DAC channels
Select DAC Register to Update
0 0 0 1 0 0 0 0 X X X X X X X X X X X X X X X X Selects DAC channel A to be updated
0 0 0 1 0 0 0 1 X X X X X X X X X X X X X X X X Selects DAC channel B to be updated
0 0 0 1 0 0 1 0 X X X X X X X X X X X X X X X X Selects DAC channel C to be updated
0 0 0 1 0 0 1 1 X X X X X X X X X X X X X X X X Selects DAC channel D to be updated
0 0 0 1 0 1 0 0 X X X X X X X X X X X X X X X X Selects DAC channel E to be updated
0 0 0 1 0 1 0 1 X X X X X X X X X X X X X X X X Selects DAC channel F to be updated
0 0 0 1 0 1 1 0 X X X X X X X X X X X X X X X X Selects DAC channel G to be updated
0 0 0 1 0 1 1 1 X X X X X X X X X X X X X X X X Selects DAC channel H to be updated
0 0 0 1 1 X X X X X X X X X X X X X X X X X X X Invalid code, no action performed
Broadcast mode, selects all DAC channels to be
0 0 0 1 1 1 1 1 X X X X X X X X X X X X X X X X
updated
Write to Selected DAC Input Register and Update Corresponding DAC Register (Individual Software LDAC)
Write to DAC input register for channel A and update
0 0 1 1 0 0 0 0 Data[11:4] Data[3:0] X X X X
channel A DAC register
Write to DAC input register for channel B and update
0 0 1 1 0 0 0 1 Data[11:4] Data[3:0] X X X X
channel B DAC register
Write to DAC input register for channel C and update
0 0 1 1 0 0 1 0 Data[11:4] Data[3:0] X X X X
channel C DAC register
Write to DAC input register for channel D and update
0 0 1 1 0 0 1 1 Data[11:4] Data[3:0] X X X X
channel D DAC register
Write to DAC input register for channel E and update
0 0 1 1 0 1 0 0 Data[11:4] Data[3:0] X X X X
channel E DAC register
Write to DAC input register for channel F and update
0 0 1 1 0 1 0 1 Data[11:4] Data[3:0] X X X X
channel F DAC register
Write to DAC input register for channel G and update
0 0 1 1 0 1 1 0 Data[11:4] Data[3:0] X X X X
channel G DAC register
Write to DAC input register for channel H and update
0 0 1 1 0 1 1 1 Data[11:4] Data[3:0] X X X X
channel H DAC register
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