Rainbow Electronics MAX5223 - Manual (Page 8)

MAX5223
Low-Power, Dual, 8-Bit, Voltage Output
Serial DAC in 8-Pin SOT23
8 _______________________________________________________________________________________
in starting with UB1 (uncommitted bit), followed by the
remaining control bits and the data byte. The least sig-
nificant bit (LSB) of the data byte (D0) is the last bit
clocked into the shift register (Figure 2).
Table 3 is an example of a 16-bit input word. It per-
forms the following functions:
• 80 hex (128 decimal) loaded into DAC registers
A and B.
• DAC A and DAC B are active.
Table 4 shows code examples and how to calculate
their corresponding outputs.
*Clocked in last
**Clocked in first
Uncommitted Bit 1 UB1**
Uncommitted Bit 2 UB2
Uncommitted Bit 3 UB3
Shutdown, Active-High SB
Shutdown, Active-High SA
Uncommitted Bit 4 UB4
Load Reg DAC B, Active-High LB
Load Reg DAC A, Active-High LA
DAC Data Bit 7 (MSB) D7
DAC Data Bit 6 D6
DAC Data Bit 5 D5
DAC Data Bit 4 D4
DAC Data Bit 3 D3
DAC Data Bit 2 D2
DAC Data Bit 1 D1
DAC Data Bit 0 (LSB) D0*
Table 1. Input Shift Register
DIN
SCLK
CS
UB1 UB2 UB3 SB SA UB4 LB LA D7 D6 D5 D4 D3 D2 D1 D0
OPTIONAL
(CONTROL BYTE) (DATA BYTE)
INSTRUCTION
EXECUTED
Figure 2. 3-Wire Serial-Interface Timing Diagram
DATA BITS
CONTROL BITS