MAX1333 Maxim Integrated Products, MAX1333 Datasheet - Page 17

• Manufacturer Part Number: MAX1333
• Description: (MAX1332 / MAX1333) True-Differential 12-Bit ADCs
• Manufacturer: Maxim Integrated Products

Figure 8. SPI Interface—Full Power-Down
Figure 9. Unipolar Transfer Function
Another way of entering the full power-down mode is
using the SHDN input. Drive SHDN to a logic low to put
the device into the full power-down mode. Drive SHDN
high to exit full power-down mode and return to normal
operating mode. SHDN overrides any software-controlled
power-down mode and every time it is deasserted, it
places the MAX1332/MAX1333 in its normal mode of
operation regardless of its previous state.
CNVST
MODE
DOUT
SCLK
FFD
FFC
FFB
FFF
FFE
004
003
002
001
000
0
1 LSB =
FS = V
ZS = 0
1
2
REF
4096
V
______________________________________________________________________________________
DIFFERENTIAL INPUT VOLTAGE (LSB)
REF
3
0
1ST SCLK RISING EDGE
4
3Msps/2Msps, 5V/3V, 2-Channel, True-
0
FULL-SCALE
TRANSITION
0
1ST 8-BIT TRANSFER
FS - 1.5 LSB
D11
NORMAL
D10
D9
FS
1ST SCLK RISING EDGE
D8
D7
Differential 12-Bit ADCs
The MAX1332/MAX1333 output is straight binary in
unipolar mode and is two’s complement in bipolar mode.
Figure 9 shows the unipolar transfer function for the
MAX1332/MAX1333. Table 1 shows the unipolar relation-
ship between the differential analog input voltage and
the digital output code. Figure 10 shows the bipolar
transfer function for the MAX1332/MAX1333. Table 2
shows the bipolar relationship between the differential
analog input voltage and the digital output code.
PPD
Figure 10. Bipolar Transfer Function
0
7FF
7FE
001
000
FFF
FFE
801
800
0
EXECUTE PARTIAL POWER-DOWN TWICE
-FS
+FS = V
1 LSB =
ZS = 0
-FS =
0
2ND 8-BIT TRANSFER
-V
REF
2
2
REF
4096
-FS + 0.5 LSB
V
REF
DIFFERENTIAL INPUT VOLTAGE (LSB)
RECOVERY
0
0
0
0
FULL-SCALE
TRANSITION
+FS - 1.5 LSB
Transfer Function
0
0
FPD
+FS
17