LTC1090CN Linear Technology, LTC1090CN Datasheet - Page 9

• Manufacturer Part Number: LTC1090CN
• Description: IC DATA ACQUIS SYS 10BIT 20-DIP
• Manufacturer: Linear Technology
• Type: Data Acquisition System (DAS), ADCr

Specifications of LTC1090CN

• Resolution (bits): 10 b
• Sampling Rate (per Second): 30k
• Data Interface: Serial
• Voltage Supply Source: Dual ±
• Voltage - Supply: 5V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Through Hole
• Package / Case: 20-DIP (0.300", 7.62mm)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

APPLICATIO S I FOR ATIO
TYPICAL PERFOR A CE CHARACTERISTICS
SCLK
The LTC1090 is a data acquisition component which
contains the following functional blocks:
1. 10-bit successive approximation capacitive
2. Analog multiplexer (MUX)
3. Sample and hold (S/H)
4. Synchronous, full duplex serial interface
5. Control and timing logic
D
OUT
D
CS
IN
A/D converter
4
3
2
1
0
4
Digital Input Logic Threshold vs
Supply Voltage
T
A
= 25°C
SGL/
DIFF
5
1
SUPPLY VOLTAGE, V
ODD/
SIGN
6
SEL1
SHIFT CONFIGURATION
U
7
SEL0 UNI MSBF WL1 WL0
(Example: Differential Inputs (CH3 to CH2), Bipolar, MSB First and 10-Bit Word Length)
WORD IN
8
CC
U
5
(V)
W
LTC1090 • TPC19
9
U
10
W
t
CYC
t
SMPL
8
1000
900
800
700
600
500
400
300
200
100
–50
10
Input Channel Leakage Current
vs Temperature
U
–25
AMBIENT TEMPERATURE, T
Operating Sequence
DON’T CARE
0
DON’T CARE
t
CONV
25
OFF CHANNELS
GUARANTEED
50
DIGITAL CONSIDERATIONS
1. Serial Interface
The LTC1090 communicates with microprocessors and
other external circuitry via a synchronous, full duplex,
four wire serial interface (see Operating Sequence). The
shift clock (SCLK) synchronizes the data transfer with
each bit being transmitted on the falling SCLK edge
and captured on the rising SCLK edge in both transmit-
ting and receiving systems. The data is transmitted and
received simultaneously (full duplex).
ON CHANNEL
75
A
(°C)
LTC1090 • TPC20
100
(SB)
B9
125
B8
B7
NEW CONFIGURATION WORD IN
SHIFT A/D RESULT OUT AND
1.75
1.25
0.75
0.25
B6
2.0
1.0
1.5
0.5
Noise Error vs Reference Voltage
B5
LTC1090 NOISE = 200µV PEAK-TO-PEAK
0.2
B4
REFERENCE VOLTAGE, V
B3
B2
LTC1090
1
B1
REF
B0
LTC1090 • TPC21
(V)
5
LTC1090 • AI01
1090fc
9