Datasheet

10
LTC1661
Figure 3. Pin Driver V
H
and V
L
Adjustment in ATE Applications
2
0.1µF
V
IN
≥ 4.3V
LTC1258-4.1
1
4.096V
4
REF
D
IN
SCK
CS/LD
V
OUTA
GND
V
CC
LTC1661
V
OUTB
0V TO 4.096V
(4mV/BIT)
T
0V TO 4.096V
(4mV/BIT)
1661 F04
4
3
2
1
8
5
7
6
0.1µF
–
+
U3A
LT1368
PIN
DRIVER
(1 0F N)
V
H
V
L
V
OUT
1661 F03
LOGIC
DRIVE
4
–5V
10V
5V
V
H
= 7.5V
(FROM MAIN
INPUT DAC)
V
L
= –2.5V
(FROM MAIN
INPUT DAC)
V
A1
= 2.5V
V
H
′ = V
H
+ ∆V
H
V
L
′ = V
L
+ ∆V
L
V
B1
R4
5k
0.1µF
8
3
1
CS/LD
D
IN
SCK
4 6
3
2
1
8
5
2
0.1µF
R3
50k
LTC1661
U1
DAC A
DAC B
R2
50k
R1
5k
0.1µF
+
–
U3B
LT1368
5V
V
B2
V
A2
= 2.5V
6
1
4 6
3
2
7
5
8
5
0.1µF
R7
50k
LTC1661
U2
DAC B
DAC A
R5
50k
R6
5k
7
R8
5k
0.1µF
0.1µF
FOR EACH U1 AND U2
CODE A CODE B ∆V
H
, ∆V
L
512 1023 –250mV
512 512 0
512 0 250mV
–2.5V ±250mV
7.5V ±250mV
V
A2
= 2.5VV
A1
=
V
H
+(V
A1
– V
B1
)V
H
′ =
R1
R2
V
L
+(V
A2
– V
B2
)V
L
′ =
FOR VALUES SHOWN,
∆V
H
, ∆V
L
ADJUSTMENT RANGE = ±250mV
∆V
H
, ∆V
L
STEP SIZE = 500µV
R1
R2
Figure 4. Using the LTC1258 and the LTC1661 In a Single Li-Ion Battery Application
TYPICAL APPLICATIO S
U