Datasheet

LTC2308
7
2308fb
TEMPERATURE (°C)
–50 –25
0
SLEEP CURRENT (μA)
4
10
0
50
75
3208 G10
2
8
6
25
100
125
TEMPERATURE (°C)
–50 –25
0
LEAKAGE CURRENT (nA)
400
1000
0
50
75
3208 G11
200
800
600
25
100
125
CH (ON)
CH (OFF)
f
SMPL
= 0ksps
TEMPERATURE (°C)
–50
0
OFFSET (LSB)
0.5
1.0
1.5
–25 0 25 50
2308 G12
75 100 125
EXTERNAL REFERENCE
BIPOLAR
UNIPOLAR
TEMPERATURE (°C)
–50 –25
–6
FULL-SCALE ERROR (LSB)
–2
4
0
50
75
2308 G13
–4
2
0
25
100
125
EXTERNAL REFERENCE
BIPOLAR
UNIPOLAR
TYPICAL PERFORMANCE CHARACTERISTICS
Sleep Current vs Temperature
Analog Input Leakage Current vs
Temperature
Offset vs Temperature
Full-Scale Error vs Temperature
T
A
= 25°C, AV
DD
= DV
DD
= OV
DD
= 5V,
f
SMPL
= 500ksps, Internal Reference, unless otherwise noted.
PIN FUNCTIONS
CH3-CH7 (Pins 1, 2, 3, 4, 5): Channel 3 to Channel 7
Analog Inputs. CH3-CH7 can be confi gured as single-
ended or differential input channels. See the Analog Input
Multiplexer section.
COM (Pin 6): Common Input. This is the reference point
for all single-ended inputs. It must be free of noise and
connected to ground for unipolar conversions and midway
between GND and REFCOMP for bipolar conversions.
V
REF
(Pin 7): 2.5V Reference Output. Bypass to GND with
a minimum 2.2μF tantalum capacitor or low ESR ceramic
capacitor. The internal reference may be over driven by an
external 2.5V reference at this pin.
REFCOMP (Pin 8): Reference Buffer Output. Bypass to
GND with a 10μF tantalum and 0.1μF ceramic capacitor
in parallel. Nominal output voltage is 4.096V. The internal
reference buffer driving this pin is disabled by grounding
V
REF
, allowing REFCOMP to be overdriven by an external
source (see Figure 6c).
GND (Pins 9, 10, 11, 18, 20): Ground. All GND pins must
be connected to a solid ground plane.