LTC2420IS8 Linear Technology, LTC2420IS8 Datasheet - Page 8

• Manufacturer Part Number: LTC2420IS8
• Description: IC ADC 20BIT MICROPOWER 8SOIC
• Manufacturer: Linear Technology

Specifications of LTC2420IS8

• Number Of Bits: 20
• Sampling Rate (per Second): 7.5
• Data Interface: MICROWIRE™, Serial, SPI™
• Number Of Converters: 2
• Power Dissipation (max): 1mW
• Voltage Supply Source: Single Supply
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

LTC2420
TYPICAL PERFOR A CE CHARACTERISTICS
PIN
V
(Pin 4) with a 10 F tantalum capacitor in parallel with
0.1 F ceramic capacitor as close to the part as possible.
V
is 0.1V to V
V
– 0.125 • V
voltage range may be limited by the pin absolute maxi-
mum rating of – 0.3V to V
GND (Pin 4): Ground. Shared pin for analog ground,
digital ground, reference ground and signal ground. Should
be connected directly to a ground plane through a mini-
mum length trace or it should be the single-point-ground
in a single point grounding system.
CS (Pin 5): Active LOW Digital Input. A LOW on this pin
enables the SDO digital output and wakes up the ADC.
Following each conversion, the ADC automatically enters
the Sleep mode and remains in this low power state as
long as CS is HIGH. A LOW on CS wakes up the ADC. A
LOW-to-HIGH transition on this pin disables the SDO
digital output. A LOW-to-HIGH transition on CS during the
Data Output transfer aborts the data transfer and starts a
new conversion.
8
CC
REF
IN
20
18
12
16
14
10
U
(Pin 3): Analog Input. The input voltage range is
(Pin 1): Positive Supply Voltage. Bypass to GND
0
(Pin 2): Reference Input. The reference voltage range
INL vs Output Rate
V
V
F
FUNCTIONS
O
CC
REF
10 20 30
= EXTERNAL
= 5V
= 5V
U
REF
CC
T
A
.
= –45 C
OUTPUT RATE (Hz)
to 1.125 • V
T
40
A
= 25 C
50 60 70 80 90 100
U
CC
T
REF
W
A
= 90 C
+ 0.3V.
. For V
2420 G28
U
REF
> 2.5V the input
20
18
16
14
12
10
0
INL vs Output Rate
V
V
F
T
O
CC
REF
A
10 20 30
= EXTERNAL
= 25 C
= 3V
T
= 2.5V
A
= –45 C
OUTPUT RATE (Hz)
40
50 60 70 80 90 100
SDO (Pin 6): Three-State Digital Output. During the data
output period this pin is used for serial data output. When
the chip select CS is HIGH (CS = V
high impedance state. During the Conversion and Sleep
periods, this pin can be used as a conversion status out-
put. The conversion status can be observed by pulling CS
LOW.
SCK (Pin 7): Bidirectional Digital Clock Pin. In Internal
Serial Clock Operation mode, SCK is used as digital output
for the internal serial interface clock during the data output
period. In External Serial Clock Operation mode, SCK is
used as digital input for the external serial interface. A
weak internal pull-up is automatically activated in Internal
Serial Clock Operation mode. The Serial Clock mode is
determined by the level applied to SCK at power up and the
falling edge of CS.
F
controls the ADC’s notch frequencies and conversion
time. When the F
converter uses its internal oscillator and the digital filter’s
first null is located at 50Hz. When the F
to GND (F
and the digital filter first null is located at 60Hz. When F
is driven by an external clock signal with a frequency f
the converter uses this signal as its clock and the digital
filter first null is located at a frequency f
O
(Pin 8): Frequency Control Pin. Digital input that
T
A
O
= 90 C
= OV), the converter uses its internal oscillator
2420 G29
O
pin is connected to V
24
22
20
18
16
0 7.5
Resolution vs Output Rate
V
V
f
O
CC
REF
= EXTERNAL
= 5V
= 5V
25
CC
OUTPUT RATE (Hz)
), the SDO pin is in a
O
CC
50
EOSC
pin is connected
(F
O
/2560.
= V
75
T
T
T
A
A
A
CC
= 25 C
= 90 C
= –45 C
), the
EOSC
2420 G30
100
O
,