ISL26320 Datasheet, PDF (15/23 Pages) Intersil Corporation – 12-bit, 250kSPS Low-power ADCs with Single-ended and Differential Inputs and Multiple Input Channels

ISL26320, ISL26321, ISL26322, ISL26323, ISL26324, ISL26325, ISL26329
5V
0.1μF
+ ^BULK
1 DNC DNC 8
2 VIN
DNC 7
2.5V
3 COMP VOUT 6
4 GND TRIM 5
ISL2631X ^VDD
ISL2632X
VREF
0.1μF
1μF (see text)
ISL21090
FIGURE 27. PRECISION VOLTAGE REFERENCE FOR +5V SUPPLY
+2.7V TO +3.6V
OR +5V
VIN 1
VOUT 2
GND
3
ISL21010
+
BULK
0.1μF
0.1μF
ISL2631X ^VDD
ISL2632X
VREF
1.25, 2.048 OR 2.5V
1μF (see text)
FIGURE 28. VOLTAGE REFERENCE FOR +2.7V TO +3.6V, OR FOR +5V SUPPLY
+2.7V TO +5V
BULK
ISL26320 ^VDD
ISL26323
1μF (see text)
FIGURE 29. VOLTAGE REFERENCE FOR ISL26320/ISL26323 IS DERIVED FROM VDD
TABLE 1. OUTPUT CODES - DIFFERENTIAL
Input Voltage
Two’s Complement (12-bit)
>(VFS-1.5 LSB)
7FF
7FF
VFS-1.5 LSB
...
7FE
000
-0.5 LSB
…
FFF
801
-VFS +0.5 LSB
…
800
NOTE: VFS in the table above equals the voltage between AIN+ and AIN-.
Differential full scale is equal to 2* VREF.
TABLE 2. OUTPUT CODES - SINGLE-ENDED
Input Voltage
Binary (12 bit)
>AIN-1.5 LSB
FFF
FFF
AIN-1.5 LSB
…
FFE
001
0.5 LSB
…
000
<0.5 LSB
000
NOTE: Single-ended full scale is equal to VREF.
15
FN8273.0
June 8, 2012