LT6654_12 LINER [Linear Technology], LT6654_12 Datasheet - Page 14

• Manufacturer Part Number: LT6654_12
• Description: SOT-23 Precision Wide Supply High Output Drive Low Noise Reference
• Manufacturer: LINER [Linear Technology]

LT6654
APPLICATIONS INFORMATION
14
20mV/DIV/AC
10mV/DIV/AC
10mV/DIV/AC
Figure 4. LT6654-2.5 Sourcing and Sinking 0.5mA
2.5V/DC
2.5V/DC
2.5V/DC
–0.5mA
0.5mA
–5mA
–4mA
Figure 5. LT6654-2.5 Sourcing 4mA to 5mA
V
V
V
I
4mA
5mA
I
I
OUT
OUT
OUT
OUT
OUT
OUT
Figure 6. LT6654-2.5 Sinking 4mA to 5mA
C
C
C
LOAD
LOAD
LOAD
= 1μF
= 1μF
= 1μF
50μs/DIV
50μs/DIV
50μs/DIV
6654 F04
6654 F05
6654 F06
Positive or Negative Operation
In addition to the series connection, as shown on the front
page of this data sheet, the LT6654 can be operated as a
negative voltage reference.
The circuit in Figure 7 shows an LT6654 confi gured for
negative operation. In this confi guration, a positive volt-
age is required at V
circuitry. This voltage must be current limited with R1 to
keep the output PNP transistor from turning on and driv-
ing the grounded output. C1 provides stability during load
transients. This connection maintains the same accuracy and
temperature coeffi cient of the positive connected LT6654.
Figure 7. Using the LT6654-2.5 to Build a –2.5V Reference
R ≤
550μA + I
V
EE
6
– V
OUT
OUT
LT6654-2.5
IN
V
(Pin 4) to bias the LT6654 internal
EE
4
1, 2
0.1μF
C1
1μF
4.7k
R1
V
OUT
3V
= –2.5V
6654 F07
6654fc