Datasheet

8
LTC1541/LTC1542
15412fd
AMPOUT (Pin 1): Op Amp Output. The output can swing
from rail-to-rail while driving a capacitive load of up to
1000pF. The output can source and sink 0.7mA (min).
AMPIN
–
(Pin 2): Inverting Input of Op Amp. The input
common mode ranges from V
SS
to (V
CC
– 1.3V). The input
current is typically 10pA at 25°C.
AMPIN
+
(Pin 3): Noninverting Input of Op Amp. The input
common mode ranges from V
SS
to (V
CC
– 1.3V). The input
current is typically 10pA at 25°C.
V
SS
(Pin 4): Negative Supply or Ground Connection.
COMPIN
+
(Pin 5): Noninverting Input of Comparator. The
input common mode ranges from V
SS
to (V
CC
– 1.3V). The
input current is typically 10pA at 25°C.
7
8
5
1
2
3
4
LTC1542
LTC1541 BD2
–
+
COMPIN
+
COMPIN
–
6
COMPOUT
V
CC
COMP
OP AMP
AMPOUT
AMPIN
–
AMPIN
+
V
SS
+
–
+
–
7
8
5
1
2
3
4
LTC1541
LTC1541 BD
–
+
COMPIN
+
6REF
COMPOUT
V
CC
COMP
OP AMP
AMPOUT
AMPIN
–
AMPIN
+
V
SS
×1
UU
U
PI FU CTIO S
BLOCK DIAGRA S
W
Op Amp Open-Loop Gain and
Phase vs Frequency
FREQUENCY (Hz)
OPEN-LOOP GAIN (dB)
PHASE SHIFT (DEGREES)
120
100
80
60
40
20
0
–20
–40
0
–45
–90
–135
–180
–225
–270
–315
–360
10 1k 10k 1M
1541/42 TPC13
100 100k
V
CC
= 5V
V
SS
= GND
R
LOAD
= 100kΩ
PHASE
GAIN
REF (Pin 6) (LTC1541): Reference Output. V
REF
= 1.2V
±1% over industrial temperature range, and is also con-
nected to inverting comparator input internally. This de-
vice can source up to 2mA and sink up to 20µA. The output
can drive a bypass capacitor of up to 0.01µF without
oscillation.
COMPIN
–
(Pin 6) (LTC1542): Inverting Input of Compara-
tor. The input common mode ranges from V
SS
to
(V
CC
– 1.3V). The input current is typically 10pA at 25°C.
COMPOUT (Pin 7): Comparator Output. The output can
source 20mA and sink 5mA.
V
CC
(Pin 8): Positive Supply, 2.5V ≤ V
CC
≤ 12.6V. The supply
bypass capacitors are not required if the supply impedance
is low. For single supply applications, it is a good general
practice to bypass V
CC
with a 0.1µF capacitor to ground.
TYPICAL PERFOR A CE CHARACTERISTICS
UW