ADT7518
Rev. A | Page 4 of 40
Parameter
1
Min
Typ
Max
Unit
Conditions/Comments
Scale Factor
8.97
mV/癈
0 V to V
REF
output. T
A
= 40癈 to +120癈.
17.58
mV/癈
0 V to 2 V
REF
output. T
A
= 40癈 to +120癈.
CONVERSION TIMES
Single channel mode.
Slow ADC
V
DD
/AIN
11.4
ms
Averaging (16 samples) on.
712
祍
Averaging off.
Internal Temperature
11.4
ms
Averaging (16 samples) on.
712
祍
Averaging off.
External Temperature
24.22
ms
Averaging (16 samples) on.
1.51
ms
Averaging off.
Fast ADC
VDD/AIN
712
祍
Averaging (16 samples) on.
44.5
祍
Averaging off.
Internal Temperature
2.14
ms
Averaging (16 samples) on.
134
祍
Averaging off.
External Temperature
14.25
ms
Averaging (16 samples) on.
890
祍
Averaging off.
ROUND ROBIN UPDATE RATE
5
Time to complete one measurement cycle
through all channels.
Slow ADC @ 25癈
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癈
Averaging On
6.41
ms
AIN1 and AIN2 are selected on Pins 7 and 8.
Averaging Off
400.84
祍
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 INPUT
4
VREF Input Range
1
VDD
V
Buffered reference.
V
REF
Input Impedance
>10
M&
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 Voltage
4
2.25
V
Temperature Coefficient
4
80
ppm/癈
OUTPUT CHARACTERISTICS
4
Output Voltage
7
0.001
V
DD
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
V
DD
= 3 V.
Power-Up Time
2.5
祍
Coming out of power-down mode. V
DD
= 5 V.
5
祍
Coming out of power-down mode. V
DD
= 3.3 V.
DIGITAL INPUTS
4
Input Current
?
礎
V
IN
= 0 V to V
DD.
V
IL
, 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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