LTC2990IMS View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTC2990IMS' PDF : 24 Pages View PDF
LTC2990
Typical ApplicationS
Oscillator/Reference Oven Temperature Regulation
HEATER
VOLTAGE
HEATERPWR = I •V
0.1Ω
5V
0.1µF
STYROFOAM
INSULATION
20°C
AMBIENT
2-WIRE
I2C
INTERFACE
VCC V1
V2
SDA
V3
SCL LTC2990
ADR0
ADR1 GND
V4
TINTERNAL
MMBT3904
470pF
TOVEN
HEATER
70°C
OVEN
2990 TA10
HEATER CONSTRUCTION:
5FT COIL OF #34 ENAMEL WIRE
~1.6Ω AT 70°C
PHEATER = ~0.4W WITH TA = 20°C
HEATER POWER = A • (TSET – TAMB) + B • ∫(TOVEN – TSET) dt
FEED
FORWARD
FEED
BACK
A = 0.004W, B = 0.00005W/DEG-s
VOLTAGE AND TEMPERATURE CONFIGURATION:
CONTROL REGISTER: 0x58
TAMB
V1, V2
REG 4, 5
REG 8, 9
0.0625°C/LSB
305.18µVLSB
TOVEN
VCC
REG A, B
REG E, F
0.0625°C/LSB
2.5V + 305.18µV/LSB
CURRENT AND TEMPERATURE CONFIGURATION:
CONTROL REGISTER: 0x59
TAMB
IHEATER
THEATER
VCC
REG 4, 5
REG 6, 7
REG A, B
REG E, F
0.0625°C/LSB
269µVLSB
0.0625°C/LSB
2.5V + 305.18µV/LSB
Wind Direction/Instrumentation
3.3V
0.1µF
VCC V1
V2
MMBT3904 3.3V MMBT3904
µC
SDA
V3
SCL LTC2990
ADR0
470pF
ADR1 GND
V4
TINTERNAL
HEATER
75Ω
0.125W
CONTROL REGISTER: 0x5D
TAMB
TR1
TR2
VCC
REG 4, 5
REG 8, 9
REG A, B
REG E, F
FAN ENABLE
2 SECOND PULSE
0.0625°C/LSB
0.0625°C/LSB
0.0625°C/LSB
2.5V + 305.18µV/LSB
2N7002
470pF
2990 TA11
2990f
22
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