LTC1277CSW Linear Technology, LTC1277CSW Datasheet - Page 7

• Manufacturer Part Number: LTC1277CSW
• Description: IC A/D CONV 12BIT W/SHTDN 24SOIC
• Manufacturer: Linear Technology

Specifications of LTC1277CSW

• Number Of Bits: 12
• Sampling Rate (per Second): 100k
• Data Interface: Parallel
• Number Of Converters: 1
• Power Dissipation (max): 20mW
• Voltage Supply Source: Dual ±
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 24-SOIC (0.300", 7.50mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: LTC1277CS

PI FU CTIO S
LTC1274
A
0V) or ±2.048V, bipolar (V
V
(10µF tantalum in parallel with 0.1µF ceramic). V
overdriven positive with an external reference voltage.
AGND (Pin 3): Analog Ground.
D11 to D4 (Pins 4 to 11): Three-State Data Outputs. D11
is the Most Significant Bit.
DGND (Pin 12): Digital Ground.
TYPICAL PERFORMANCE CHARACTERISTICS
IN
REF
3.0
2.5
2.0
1.5
1.0
0.5
3.0
2.5
2.0
1.5
1.0
0.5
U
0
0
(Pin 1): Analog Input. 0V to 4.096V, unipolar (V
–55
Supply Current vs Temperature
0
Supply Current vs
Supply Voltage
(Pin 2): 2.42V Reference Output. Bypass to AGND
f
SAMPLE
f
SAMPLE
–25
1
U
= 100kHz
= 100kHz
SUPPLY VOLTAGE (V)
0
TEMPERATURE (°C)
2
25
3
U
50
4
75
SS
LTC1274/77 • TPC14
W
LT1274/77 • TPC11
100
= – 5V).
5
U
125
6
10000
1000
–100
100
–10
–20
–30
–40
–50
–60
–70
–80
–90
10
1
0
0.1
Power Supply Feedthrough vs
Ripple Frequency
1
Supply Current vs Sample Rate
With Sleep and Nap Modes
V
C
REF
f
REF
SS
SAMPLE
(V
= 4.7µF
1
can be
RIPPLE
WITHOUT SLEEP OR NAP
RIPPLE FREQUENCY (kHz)
SS
= 100kHz
DGND (V
AV
NAP = REFRDY
(SLEEP MODE)
NAP = 5V
(SLEEP MODE)
SAMPLE RATE (Hz)
10
10
= 10mV)
=
DD
(V
RIPPLE
100
RIPPLE
D3 to D0 (Pins 13 to 16): Three-State Data Outputs.
REFRDY (Pin 17): Reference Ready Signal. It goes high
when the reference has settled after SLEEP indicating that
the ADC is ready to sample.
SLEEP (Pin 18): SLEEP Mode Input. Tie this pin to low to
put the ADC in Sleep mode and save power (REFRDY will
go low). The device will draw 1µA in this mode.
CONVST (Pin 19): Conversion Start Signal. This active low
signal starts a conversion on its falling edge (to recognize
CONVST, CS has to be low.)
= 0.1V)
= 1mV)
NAP MODE
100
1k
LTC1274/77 • TPC15
LTC1274/77 • TPC12
10k
1000
100k
2.435
2.430
2.425
2.420
2.415
2.410
2.405
10
9
8
7
6
5
4
3
2
1
0
LTC1274/LTC1277
–6
Wake-Up Time vs
C
0
Reference Voltage vs
Load Current
REF
T
A
5
–5
= 25°C
(Sleep Mode)
10
–4
LOAD CURRENT (mA)
15
20
–3
C
REF
25
(µF)
–2
30
– 1
35
LTC1274/77 • TPC16
LT1274/77 • TPC13
40
0
45
7
50
1