LTC2704IGW-16 Linear Technology, LTC2704IGW-16 Datasheet - Page 12

• Manufacturer Part Number: LTC2704IGW-16
• Description: IC,D/A CONVERTER,QUAD,16-BIT,CMOS,SOP,44PIN
• Manufacturer: Linear Technology

OPERATIO
Table 2. Address Codes
Codes not shown are reserved and should not be used.
LTC2704
OUTPUT RANGES
The LTC2704 is a quad DAC with software-programmable
output ranges. SoftSpan provides two unipolar output
ranges (0V to 5V and 0V to 10V), and four bipolar ranges
(±2.5V, ±5V, ±10V and – 2.5V to 7.5V). These ranges are
obtained when an external precision 5V reference and
analog supplies of ±12V to ±15V are used. When a
reference voltage of 2V and analog supplies of ±5V are
12
A3 A2 A1
0
0
0
0
1
0
0
1
1
1
0
1
0
1
1
Table 1. Command Codes
Codes not shown are reserved and should not be used.
Note 1: Normal operation can be resumed by issuing any update B1→B2 command to the sleeping DAC.
A0
C3
0
0
0
0
1
0
0
0
0
0
0
1
1
1
1
1
1
1
1
U
C2
0
0
1
1
1
1
0
0
0
0
1
1
1
1
CODE
All DACs
DAC A
DAC B
DAC C
DAC D
C1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
n
C0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Update B1→B2 All DACs
Update B1→B2 All DACs
Update B1→B2 All DACs
Write to B1 Span DAC n
Write to B1 Code DAC n
Write to B1 Span DAC n
Write to B1 Code DAC n
Write to B1 Span DAC n
Write to B1 Code DAC n
Update B1→B2 DAC n
Update B1→B2 DAC n
Update B1→B2 DAC n
Sleep DAC n (Note 1)
Read B1 Span DAC n
Read B1 Code DAC n
Read B2 Span DAC n
Read B2 Code DAC n
READBACK POINTER n
No Operation
COMMAND
DAC A
DAC B
DAC C
DAC D
DAC A
CURRENT INPUT WORD W
Set by Previous Command
Set by Previous Command
Set by Previous Command
Set by Previous Command
Set by Previous Command
Set by Previous Command
Set by Previous Command
Set by Previous Command
Set by Previous Command
Set by Previous Command
READBACK POINTER—
Table 3. Span Codes
Codes not shown are reserved and should not be used.
used, the SoftSpan ranges become: 0V to 2V, 0V to 4V,
±1V, ±2V, ±4V and –1V to 3V. The output ranges are
linearly scaled for references other than 2V and 5V (appro-
priate analog supplies should be used within the range
±5V to ±15V). Each of the four DACs can be programmed
to any one of the six output ranges. DAC outputs can swing
to ±10V on ±10.8V supplies (±12V supplies with ±10%
tolerance) while sourcing or sinking 5mA of load current.
S3
0
0
0
0
0
0
S2
0
0
0
0
1
1
B1 Span DAC n
B1 Code DAC n
B2 Span DAC n
B2 Code DAC n
S1
0
0
1
1
0
0
0
S0
0
1
0
1
0
1
NEXT INPUT WORD W
READBACK POINTER—
SPAN
Unipolar 0V to 5V
Unipolar 0V to 10V
Bipolar –5V to 5V
Bipolar –10V to 10V
Bipolar – 2.5V to 2.5V
Bipolar –2.5V to 7.5V
B1 Span DAC n
B1 Code DAC n
B2 Span DAC n
B2 Code DAC A
B2 Span DAC n
B2 Code DAC n
B2 Span DAC n
B2 Code DAC n
B2 Span DAC n
B2 Code DAC n
+1
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