TLC5618 Datasheet, PDF (16/26 Pages) Texas Instruments – PROGRAMMABLE DUAL 12-BIT DIGITAL-TO-ANALOG CONVERTERS

TLC5618, TLC5618A
PROGRAMMABLE DUAL 12-BIT DIGITAL-TO-ANALOG CONVERTERS
SLAS156E – JULY 1997 – REVISED SEPTEMBER 1999
APPLICATION INFORMATION
Table 2 shows the function of program bits D15 – D12.
Table 2. Program Bits D15 – D12 Function
PROGRAM BITS
D15
D14
D13
D12
DEVICE FUNCTION
1
X
X
X
Write to latch A with serial interface register data
and latch B updated with buffer latch data
0
X
X
0 Write to latch B and double buffer latch
0
X
X
1 Write to double buffer latch only
X
0
X
X 12.5 µs settling time
X
1
X
X 2.5 µs settling time
X
X
0
X Powered-up operation
X
X
1
X Power down mode
function of the latch control bits (D15 and D12)
Three data transfers are possible. All transfers occur immediately after CS goes high and are described in the
following sections.
latch A write, latch B update (D15 = high, D12 = X)
The serial interface register (SIR) data are written to latch A and the double buffer latch contents are written to
latch B. The double buffer contents are unaffected. This program bit condition allows simultaneous output
updates of both DACs.
Serial
Interface
Register
Latch A
To DAC A
D12 = X
D15 = High
Double
Buffer Latch
Latch B
To DAC B
Figure 20. Latch A Write, Latch B Update
latch B and double-buffer 1 write (D15 = low, D12 = low)
The SIR data are written to both latch B and the double buffer. Latch A is unaffected.
Serial
Interface
Register
Latch A
To DAC A
D12 = Low
D15 = Low
Double
Buffer Latch
Latch B
To DAC B
Figure 21. Latch B and Double-Buffer Write
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