LTC1654 LINER [Linear Technology], LTC1654 Datasheet - Page 7

• Manufacturer Part Number: LTC1654
• Description: Dual 14-Bit Rail-to-Rail DAC in 16-Lead SSOP Package
• Manufacturer: LINER [Linear Technology]

OPERATION
Power Down
Each DAC can also be independently powered down to less
than 5 A/DAC of supply current. The reference pin also
goes into a high impedance state when the DAC is powered
down and the reference current will drop to below 0.1 A.
The amplifiers’ output stage is also three-stated but the
Table 1.
CONTROL
C3 C2 C1 C0
INPUT WORD
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
C3
CONTROL
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
C2
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
C1 C0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
U
Load Input Register n
Update (Power-Up) DAC Register n
Load Input Register n, Update (Power-Up) All
Load and Update n
Power Down n
Fast n (Speed States are Maintained Even If DAC is
Put in Power-Down Mode)
Slow n (Default State is Slow When Supplies are
Powered Up)
Reserved (Do Not Use)
Reserved (Do Not Use)
Reserved (Do Not Use)
Reserved (Do Not Use)
Reserved (Do Not Use)
Reserved (Do Not Use)
Reserved (Do Not Use)
Reserved (Do Not Use)
No Operation
A3
ADDRESS
A2
A1
A0 D13 D12 D11 D10 D9 D8 D7
DATA (14 + 2 DUMMY LSBs)
V
connected to them resulting in an effective resistance from
V
X
REFLO. Because of this resistance, V
when the DAC is powered down and V
ADDRESS (n)
A3 A2 A1 A0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
OUT
OUT
1
/X
1/2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
D6 D5 D4 D3 D2
to REFLO. This resistance is typically 90k when the
pins still have the internal gain-setting resistors
pin is tied to V
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
DAC A
DAC B
Reserved (Do Not Use)
Reserved (Do Not Use)
Reserved (Do Not Use)
Reserved (Do Not Use)
Reserved (Do Not Use)
Reserved (Do Not Use)
Reserved (Do Not Use)
Reserved (Do Not Use)
Reserved (Do Not Use)
Reserved (Do Not Use)
Reserved (Do Not Use)
Reserved (Do Not Use)
Reserved (Do Not Use)
Both DACs
OUT
and 36k when X
D1 D0
X
OUT
1654 TABLE
OUT
X
will go to V
LTC1654
1
is unloaded.
/X
1/2
is tied to
REFLO
7