MP7226 Exar Corporation, MP7226 Datasheet - Page 9

• Manufacturer Part Number: MP7226
• Description: Bicmos Fixed, Quad, Voltage Output, Single Or Dual Supply 8-bit Digital-to-analog Converter
• Manufacturer: Exar Corporation

APPLICATIONS INFORMATION
Power On Reset
the addressed DAC will receive input data.
Power Supply
supply. Improved zero-code settling error can be obtained by
using dual power supplies. The dual power supply specifica-
tions are a positive supply (V
a –5V supply (V
a positive supply (V
+4.75V to 5.5V . The specified reference voltage (V
under these conditions is from +2V to V
cations requiring +10V at the output (V
be +14V minimum to meet data sheet limits . 8-bit performance
is guaranteed for single supply operation (V
zero code output sink capability is improved with V
adequate DAC and Buffer operation, V
low V
Power Supply Decoupling
regulated and filtered. Local power supply decoupling consist-
ing of a 10 F tantalum capacitor in parallel with a 0.01 F ce-
ramic is recommended. The decoupling capacitors should be
connected between the V
AGND if V
Unipolar Output Operation
ity as the output voltage. Since the reference voltage must al-
ways be positive with respect to GND, the output can only be 0 or
positive.
operation
At power up, all inputs are reset to 0 V if WR = 1. For WR = 0,
The MP7226 can operate with either a single or dual power
The Power Supplies used with the MP7226 should be well
In this configuration, the reference voltage is the same polar-
Table 2. shows the code relationship for the part in unipolar
Rev. 2.00
DD
by at least 3.5V.
SS
= –5V.
SS
) . The single power supply specifications are
DD
) range of +10.5V to +16.5V, or range of
DD
DD
and AGND, and between V
) range of +10.5V to +16.5V, and
DD
REF
REF
–4V. For those appli-
= +10V), V
must always be be-
SS
= 0V); however,
SS
REF
= –5V. For
DD
) range
SS
must
and
9
Note : 1 LSB + (2
1
1
1
0
0
0
Digital Input
1
0
0
1
0
0
1
1
1
0
0
0
Digital Input
1
0
0
1
0
0
1
0
0
1
0
0
1
0
0
1
0
0
1
0
0
1
0
0
Table 2. Unipolar Code Table
Table 3. Bipolar Code Table
1
0
0
1
0
0
1
0
0
1
0
0
1
0
0
1
0
0
1
0
0
1
0
0
1
0
0
1
0
0
1
0
0
1
0
0
1
0
0
1
0
0
*8
1
1
0
1
1
0
1
1
0
1
1
0
) (V
* V
REF
) V
Analog Output, V
) + 1
REF
Analog Output
) V
) V
* V
* V
REF
) V
) V
) V
) V
256
( 128
MP7226
128
( 128
REF
REF
REF
REF
256
0 V
REF
REF
REF
REF
0 V
(V
) + * V
) + )
( 127
( 1
( 1
( 127
128
128
128
128
( 255
( 129
( 127
( 1
REF
256
256
256
256
)
)
)
)
)
)
)
)
)
OUT
V
REF
REF
2