Datasheet

®
5
ADS7845
TYPICAL PERFORMANCE CURVES (CONT)
At T
A
= +25°C, +V
CC
= +2.7V, V
REF
= +2.5V, f
SAMPLE
= 125kHz, and f
CLK
= 16 • f
SAMPLE
= 2MHz, unless otherwise noted.
REFERENCE CURRENT vs SAMPLE RATE
750 12525 50 100
Sample Rate (kHz)
Reference Current (µA)
14
12
10
8
6
4
2
0
REFERENCE CURRENT vs TEMPERATURE
20–40 100–20 0 40
Temperature (°C)
Reference Current (µA)
18
16
14
12
10
8
6
60 80
2
1.8
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
0
LSB Error
20 40 60 80 100 120 140 160 180 200
Sampling Rate (kHz)
MAXIMUM SAMPLING RATE vs R
IN
INL: R = 2kΩ
INL: R = 500Ω
DNL: R = 2kΩ
DNL: R = 500Ω
SWITCH ON RESISTANCE vs TEMPERATURE
(X+, Y+: +V
CC
to Pin; X–, Y–: Pin to GND)
20–40 100–20
UL
LL
40
Temperature (°C)
R
ON
(Ω)
16
14
12
10
8
6
4
2
60 800
UR
LR
SWITCH ON RESISTANCE vs +V
CC
(X+, Y+: +V
CC
to Pin; X–, Y–: Pin to GND)
3.5252.5
UL
LL LR
4
+V
CC
(V)
R
ON
(Ω)
16
14
12
10
8
6
4
2
4.53
UR