Ultra-Small, Quad-Channel, 8-/10-/12-Bit Buffered

MAX5813/MAX5814/MAX5815

 Maxim Integrated Products 21

The MAX5813/MAX5814/MAX5815 are fully compatible

ance inputs; SDA has an open drain which pulls the data

line low to transmit data or ACK pulses. Figure 8 shows a

This section lists the user accessible commands and

registers for the MAX5813/MAX5814/MAX5815.

Table 5 provides detailed information about the Command

Registers.

CODEn Command

The CODEn command (B[23:20] = 0000) updates the

CODE register contents for the selected DAC(s). Changes

to the CODE register content based on this command will

not affect DAC outputs directly unless the LDAC is in a

low state or the DAC latch has been configured to be

transparent. Issuing the CODEn command with DAC

SELECTION = ALL DACs is equivalent to CODE_ALL

(B[23:16] = 10000000). See Table 5 and Table 6.

LOADn Command

The LOADn command (B[23:20] = 0001) updates the

DAC register content for the selected DAC(s) by upload-

ing the current contents of the CODE register. The

LOADn command can be used with DAC SELECTION =

ALL DACs to issue a software load for all DACs, which

is equivalent to the LOAD_ALL (B[23:16] = 10000001)

command. See Table 5 and Table 6.

CODEn_LOAD_ALL Command

The CODEn_LOAD_ALL command (B[23:20] = 0010)

updates the CODE register contents for the selected

DAC(s) as well as the DAC register content of all DACs.

Channels for which the CODE register content has not

been modified since the last load to DAC register or LDAC

operation will not be updated to reduce digital crosstalk.

Issuing this command with DAC_ADDRESS = ALL is

equivalent to the CODE_ALL_LOAD_ALL command. The

CODEn_LOAD_ALL command by definition will modify at

least one CODE register. To avoid this, use the LOADn

command with DAC SELECTION = ALL DACs or use the

LOAD_ALL command. See Table 5 and Table 6.

CODEn_LOADn Command

The CODEn_LOADn command (B[23:20] = 0011) updates

the CODE register contents for the selected DAC(s) as

well as the DAC register content of the selected DAC(s).

Channels for which the CODE register content has not

been modified since the last load to DAC register or

LDAC operation will not be updated to reduce digital

crosstalk. Issuing this command with DAC SELECTION

= ALL DACs is equivalent to the CODE_ALL_LOAD_ALL

command. See Table 5 and Table 6.

CODE_ALL Command

The CODE_ALL command (B[23:16] = 10000000)

updates the CODE register contents for all DACs. See

Table 5.

LOAD_ALL Command

The LOAD_ALL command (B[23:16] = 10000001) updates

the DAC register content for all DACs by uploading the

current contents of the CODE registers. See Table 5.

CODE_ALL_LOAD_ALL Command

The CODE_ALL_LOAD_ALL command (B[23:16] =

1000001x) updates the CODE register contents for all

DACs as well as the DAC register content of all DACs.

See Table 5.

µC

ADDR0

(ADDR1)

SCL

SDA

SCL

SDA

ADDR0

(ADDR1)

( ) TSSOP PACKAGE ONLY

+5V

SCL

SDA

MAX5813

MAX5814

MAX5815

MAX5813

MAX5814

MAX5815