max5322 Maxim Integrated Products, Inc., max5322 Datasheet - Page 16

• Manufacturer Part Number: max5322
• Description: Max5322 ?10v, Dual, 12-bit, Serial, Voltage-output Dac
• Manufacturer: Maxim Integrated Products, Inc.

(max), DOUT is high impedance, and OUTA and OUTB
are pulled to SGNDA and SGNDB, respectively, through
the internal feedback resistors of the output amplifier
(Figure 1). When coming out of shutdown, or during
device power-up, allow 350µs for the output to stabilize.
±10V, Dual, 12-Bit, Serial, Voltage-Output DAC
A single supply of +12V to +15V is required to realize an
output swing of 0 to 10V. A dual supply of ±12V to ±15V
is required to realize an output swing of ±10V, and allows
unipolar, 0 to +10V output if UNI/BIP_ is forced high. A
+3V to +5V digital power supply and two +2.000V to
+5.250V external reference voltages are also required.
Always bring up the reference voltages last; the other
power supplies do not require sequencing.
Table 3. Output Voltage as Input Code Examples
Figure 5. Unipolar Transfer Function
16
MSB
BINARY DAC CODE
1111 1111 1111
1000 0000 0001
1000 0000 0000
0111 1111 1111
0000 0000 0001
0000 0000 0000
______________________________________________________________________________________
4095
4094
4093
4092
2049
2048
2047
3
2
1
0
1 LSB =
Applications Information
2 x V
LSB
4096
REF
hex DIGITAL INPUT CODE (LSB)
UNIPOLAR (UNI/BIP_ = HIGH)
+2 x V
Power Supplies
+2 x V
+2 x V
+2 x V
+2 x V
REF
REF
REF
REF
(2048 / 4096) = V
REF
(4095 / 4096)
(2049 / 4096)
(2047 / 4096)
0
(1 / 4096)
REF
Bypass V
AGND, and bypass V
tors to DGND. Minimize trace lengths to reduce induc-
tance. Digital and AC transient signals on AGND or
DGND can create noise at the output. Connect AGND
and DGND to the highest quality ground available. Use
proper grounding techniques, such as a multilayer board
with a low-inductance ground plane or star connect all
ground return paths back to AGND. Carefully lay out the
traces between channels to reduce AC cross coupling
and crosstalk. Wire-wrapped boards, sockets, and
breadboards are not recommended.
Figure 6. Bipolar Transfer Function
ANALOG OUTPUT
+2047
+2046
+2045
+2044
-2045
-2046
-2047
-2048
DD
+1
-1
0
and V
1 LSB =
-2 x V
4 x V
SS
4096
Power-Supply Bypassing and
BIPOLAR (UNI/BIP_ = LOW)
REF
CC
with 1.0µF and 0.1µF capacitors to
hex DIGITAL INPUT CODE (LSB)
+2 x V
REF
-2 x V
+2 x V
with a 1.0µF and 0.1µF capaci-
-2 x V
(2048 / 2048) = -2 x V
REF
REF
Ground Management
REF
REF
(2047 / 2048)
(2047 / 2048)
0
(1 / 2048)
(1 / 2048)
REF