MP7612AP EXAR [Exar Corporation], MP7612AP Datasheet - Page 8

• Manufacturer Part Number: MP7612AP
• Description: Octal 12-Bit DAC Array D/A Converter with Output Amplifier and Serial Data/Address uP Control Logic
• Manufacturer: EXAR [Exar Corporation]

and board wire (space). If the LD signal is high, the CLK signal
loads the digital input bits (SDI) into the shift register (4 bits ad-
dress A3 to A0 plus 12 bits data DB11 to DB0 for the MP7612).
The LD signal going low loads the data into the selected DAC.
MP7612
-processor logic interface to reduce pin count, package size,
The MP7612 is equipped with a serial data (3-wire standard)
Rev. 3.00
Reset all DACs
to 0 V
Shift Data In
and Out
Stop Shifting
Data In and
Out
Load DACs
Function
DAC 0
DAC 1
DAC 2
DAC 3
DAC 4
DAC 5
DAC 6
DAC 7
Note: For timing information see Electrical Characteristics
A3
X
X
X
0
0
0
0
0
0
0
0
1
1
1
A2 A1 A0
X
X
X
0
0
0
0
1
1
1
1
0
1
1
Table 1. Digital Function Truth Table
X
X
X
0
0
1
1
0
0
1
1
0
1
1
X
X
X
0
1
0
1
0
1
0
1
0
0
1
No Operation
No Operation
Serial In/Serial Out
No Operation
No Operation
1
1
1
1
1
1
1
1
LD
X
1
0
0
0
0
0
0
0
0
0
8
The LD signal going low also disables the serial data (SDI), out-
put (SDO 3-stated) and the CLK input. This design tremen-
dously reduces digital noise and glitch transients into the DACs
due to free running CLK and SDI. Note also that the preset sig-
nal (RST) resets all analog outputs to 0 volt regardless of digital
inputs.
Repeat
0
CLK
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
1
RST
1
1
1
1
1
1
1
1
1
1
1
1
0
Data Input
Valid
SDI
X
X
X
X
X
X
X
X
X
X
X
X
Data Output
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Hi-Z
SDO
Valid
Hi-Z
X