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ADT7518 Datasheet(PDF) 4 Page - Analog Devices

Part No. ADT7518
Description  SPI/I2C Compatible, Temperature Sensor, 4-Channel ADC and Quad Voltage Output DAC
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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ADT7518 Datasheet(HTML) 4 Page - Analog Devices

 
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ADT7518
Rev. A | Page 4 of 40
Parameter1
Min
Typ
Max
Unit
Conditions/Comments
Scale Factor
8.97
mV/°C
0 V to VREF output. TA = –40°C to +120°C.
17.58
mV/°C
0 V to 2 VREF output. TA = –40°C to +120°C.
CONVERSION TIMES
Single channel mode.
Slow ADC
VDD/AIN
11.4
ms
Averaging (16 samples) on.
712
µs
Averaging off.
Internal Temperature
11.4
ms
Averaging (16 samples) on.
712
µs
Averaging off.
External Temperature
24.22
ms
Averaging (16 samples) on.
1.51
ms
Averaging off.
Fast ADC
VDD/AIN
712
µs
Averaging (16 samples) on.
44.5
µs
Averaging off.
Internal Temperature
2.14
ms
Averaging (16 samples) on.
134
µs
Averaging off.
External Temperature
14.25
ms
Averaging (16 samples) on.
890
µs
Averaging off.
ROUND ROBIN UPDATE RATE5
Time to complete one measurement cycle
through all channels.
Slow ADC @ 25°C
Averaging On
79.8
ms
AIN1 and AIN2 are selected on Pins 7 and 8.
Averaging Off
4.99
ms
AIN1 and AIN2 are selected on Pins 7 and 8.
Averaging On
94.76
ms
D+ and D– are selected on Pins 7 and 8.
Averaging Off
9.26
ms
D+ and D– are selected on Pins 7 and 8.
Fast ADC @ 25°C
Averaging On
6.41
ms
AIN1 and AIN2 are selected on Pins 7 and 8.
Averaging Off
400.84
µs
AIN1 and AIN2 are selected on Pins 7 and 8.
Averaging On
21.77
ms
D+ and D– are selected on Pins 7 and 8.
Averaging Off
3.07
ms
D+ and D– are selected on Pins 7 and 8.
DAC EXTERNAL REFERENCE INPUT4
VREF Input Range
1
VDD
V
Buffered reference.
VREF Input Impedance
>10
MΩ
Buffered reference and power-down mode.
Reference Feedthrough
–90
dB
Frequency = 10 kHz.
Channel-to-Channel Isolation
–75
dB
Frequency = 10 kHz.
ON-CHIP REFERENCE
Reference Voltage4
2.25
V
Temperature Coefficient4
80
ppm/°C
OUTPUT CHARACTERISTICS4
Output Voltage 7
0.001
VDD − 0.1
V
This is a measure of the minimum and maximum
drive capability of the output amplifier.
DC Output Impedance
0.5
Short-Circuit Current
25
mA
VDD = 5 V.
16
mA
VDD = 3 V.
Power-Up Time
2.5
µs
Coming out of power-down mode. VDD = 5 V.
5
µs
Coming out of power-down mode. VDD = 3.3 V.
DIGITAL INPUTS4
Input Current
±1
µA
VIN = 0 V to VDD.
VIL, Input Low Voltage
0.8
V
VIH, Input High Voltage
1.89
V
Pin Capacitance
3
10
pF
All digital inputs.
SCL, SDA Glitch Rejection
50
ns
Input filtering suppresses noise spikes of less
than 50 ns.
LDAC Pulse Width
20
ns
Edge triggered input.


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