Datasheet

LTC2970/LTC2970-1
9
29701fc
CURRENT (mA)
0
ΔV
DD
(ppm)
–500
–400
–300
–3
–5
29701 G19
–600
–700
–800
–1 –2 –4
–200
–100
0
–45°C
25°C90°C
V
12VIN
= 12V
V
12VIN
(V)
8
–500
ΔV
DD
(ppm)
–400
–200
–100
0
12
400
29701 G20
–300
10
9
13 14
10 15
100
200
300
25°C
90°C
NO LOAD ON V
DD
–45°C
TEMPERATURE (°C)
–50
–40
SHORT-CIRCUIT CURRENT (mA)
–35
–30
–25
–25 0 25 50
29701 G21
75 100
V
12VIN
= 12V
V
DD
= 0V
V
DD
Regulator Load Regulation
V
DD
Regulator Line Regulation
V
DD
Regulator Short-Circuit
Current vs Temperature
TYPICAL PERFOR A CE CHARACTERISTICS
UW
PI FU CTIO S
UUU
V
IN0_AP
(Pin 1): Positive CH0_A ADC Multiplexer Input.
The output of the differential, 7:1 multiplexer connects to
the input of the ADC. CH0_A can be confi gured to servo
IDAC0.
V
IN0_AM
(Pin 2): Negative CH0_A ADC Multiplexer Input.
The output of the differential, 7:1 multiplexer connects to
the input of the ADC. CH0_A can be confi gured to servo
IDAC0.
V
IN0_BP
(Pin 3): Positive CH0_B ADC Multiplexer Input. The
output of the differential, 7:1 multiplexer connects to the
input of the ADC. CH0_B is a voltage monitor input only.
V
IN0_BM
(Pin 4): Negative CH0_B ADC Multiplexer Input.
The output of the differential, 7:1 multiplexer connects to the
input of the ADC. CH0_B is a voltage monitor input only.
V
IN1_AP
(Pin 5): Positive CH1_A ADC Multiplexer Input.
The output of the differential, 7:1 multiplexer connects to
the input of the ADC. CH1_A can be confi gured to servo
IDAC1.
V
IN1_AM
(Pin 6): Negative CH1_A ADC Multiplexer Input.
The output of the differential, 7:1 multiplexer connects to
the input of the ADC. CH1_A can be confi gured to servo
IDAC1.
V
IN1_BP
(Pin 7): Positive CH1_B ADC Multiplexer Input. The
output of the differential, 7:1 multiplexer connects to the
input of the ADC. CH1_B is a voltage monitor input only.
V
IN1_BM
(Pin 8): Negative CH1_B ADC Multiplexer Input.
The output of the differential, 7:1 multiplexer connects to the
input of the ADC. CH1_B is a voltage monitor input only.
V
DD
(Pin 9): V
DD
Power Supply, Voltage Monitor Input,
and Internal 5V Regulator Output. The supply input range
is 4.5V to 5.75V. The V
DD
pin voltage can be connected
to the ADC through an internal mux. Bypass the V
DD
pin
to device ground with a 100nF capacitor (C
VDD
). If no 5V
input voltage supply is available, fl oat the V
DD
pin and
power the LTC2970 from the 12V
IN
pin.
12V
IN
(Pin 10): 12V Power Supply and Voltage Monitor
Input. An internal regulator generates 5V from 12V
IN
. The
input range for 12V
IN
is 8V to 15V. Bypass this pin with a
100nF capacitor. The regulator’s output is connected to the
V
DD
pin. The 12V
IN
pin voltage can also be monitored by
the ADC through a 3:1 attenuator and the internal mux. If
no 12V supply input is available, tie the 12V
IN
to the V
DD
pin and operate from 4.5V to 5.75V.
V
OUT0
(Pin 11): CH0 Voltage Output. Buffered version of
IDAC0 output voltage.