Rainbow-electronics MAX5223 Manual de usuario descargar pdf (Pagina 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 2UB2

Uncommitted Bit 3UB3

Shutdown, Active-HighSB

Shutdown, Active-HighSA

Uncommitted Bit 4UB4

Load Reg DAC B, Active-HighLB

Load Reg DAC A, Active-HighLA

DAC Data Bit 7 (MSB)D7

DAC Data Bit 6D6

DAC Data Bit 5D5

DAC Data Bit 4D4

DAC Data Bit 3D3

DAC Data Bit 2D2

DAC Data Bit 1D1

DAC Data Bit 0 (LSB)D0*

Table 1. Input Shift Register

DIN

SCLK

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 BITSCONTROL BITS

1 2 3 4 5 6 7 8 9 10 11

Serial DAC in 8-Pin SOT23 1

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