LTC2408CG Linear Technology, LTC2408CG Datasheet - Page 35

• Manufacturer Part Number: LTC2408CG
• Description: IC A/D CONV 24BIT 8-CHAN 28-SSOP
• Manufacturer: Linear Technology

Specifications of LTC2408CG

• Number Of Bits: 24
• Sampling Rate (per Second): 7.5
• Data Interface: MICROWIRE™, Serial, SPI™
• Number Of Converters: 1
• Power Dissipation (max): 1mW
• Voltage Supply Source: Single Supply
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 28-SSOP (0.200", 5.30mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

APPLICATIONS
PACKAGE DESCRIPTIO
These infrared thermocouples are self-contained: 1) they
do not require external cold junction compensation; 2)
they cannot use conventional open thermocouple detec-
tion schemes; and 3) their output impedances are high,
approximately 3k . Alternatively, conventional thermo-
couples can be connected directly to the LTC2408 (not
shown) and cold junction compensation can be provided
by an external temperature sensor connected to a different
channel (see the thermistor circuit on CH5) or by using the
LT1025, a monolithic cold-junction compensator IC.
The components connected to CH7 are used to sense
daylight or photodiode current with a resolution of 300pA.
In the figure, the photodiode is biased in photoconduc-
tive mode; however, the LTC2408 can accommodate
either photovoltaic or photoconductive configurations.
(0.005 – 0.009)
**
*
0.13 – 0.22
NOTE: DIMENSIONS ARE IN MILLIMETERS
DIMENSIONS DO NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.152mm (0.006") PER SIDE
DIMENSIONS DO NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.254mm (0.010") PER SIDE
U
(0.205 – 0.212)
INFORMATION
5.20 – 5.38**
U
(0.022 – 0.037)
0.55 – 0.95
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
W
U
Dimensions in millimeters (inches) unless otherwise noted.
28-Lead Plastic SSOP (0.209)
0 – 8
U
(LTC DWG # 05-08-1640)
G Package
(0.0256)
0.65
BSC
The photodiode chosen (Hammatsu S1336-5BK) pro-
duces an output of 500mA per watt of optical illumina-
tion. The output of the photodiode is dependent on two
factors: active detector area (2.4mm • 2.4mm) and
illumination intensity. With the 5k resistor, optical inten-
sities up to 368W/m
proximately 1000W/m
With a resolution of 300pA, the optical dynamic range
covers 6 orders of magnitude.
The application circuits shown connected to the LTC2408
demonstrate the mix-and-match capabilities of this multi-
plexed-input, high resolution
signals and high level signals can be accommodated with
a minimum of additional circuitry.
28
1 2 3 4 5 6 7 8 9 10 11 12
(0.010 – 0.015)
27
0.25 – 0.38
26
25
24
(0.397 – 0.407)
10.07 – 10.33*
23
22 21 20 19 18 17 16 15
2
2
) can be measured by the LTC2408.
at 960nM (direct sunlight is ap-
LTC2404/LTC2408
13
(0.002 – 0.008)
14
0.05 – 0.21
(0.068 – 0.078)
1.73 – 1.99
ADC. Very low level
(0.301 – 0.311)
G28 SSOP 1098
7.65 – 7.90
35