MAX5354 Maxim, MAX5354 Datasheet - Page 13

• Manufacturer Part Number: MAX5354
• Description: 10-Bit Voltage-Output DACs in 8-Pin MAX
• Manufacturer: Maxim

Table 3. Bipolar Code Table
NOTE: ( ) are for sub-bits.
Figure 8. Unipolar Output Circuit
MSB
1 1 1 1 1 1 1 1 1 1 ( 0 0 0 )
1 0 0 0 0 0 0 0 0 1 ( 0 0 0 )
1 0 0 0 0 0 0 0 0 0 ( 0 0 0 )
0 1 1 1 1 1 1 1 1 1 ( 0 0 0 )
0 0 0 0 0 0 0 0 0 1 ( 0 0 0 )
0 0 0 0 0 0 0 0 0 0 ( 0 0 0 )
MAX5354
MAX5355
DAC CONTENTS
______________________________________________________________________________________
REF
LSB
DAC
ANALOG OUTPUT
-V
+5V/3.3V
REF
V
+V
+V
-V
-V
DD
REF
REF
REF
REF
512
512
GND
0V
512
512
511
512
512
511
1
1
- V
FB
REF
OUT
10-Bit Voltage-Output DACs
The MAX5354’s total harmonic distortion plus noise
(THD+N) is typically less than -77dB (full-scale code),
and the MAX5355’s THD+N is typically less than -72dB
(full-scale code), given a 1Vp-p signal swing and input
frequencies up to 25kHz. The typical -3dB frequency is
650kHz for both devices, as shown in the Typical
Operating Characteristics graphs.
The circuit of Figure 12 places an NPN transistor
(2N3904 or similar) within the op-amp feedback loop
to implement a digitally programmable, unidirectional
current source. The output current is calculated with
the following equation:
where NB is the numeric value of the DAC’s binary
input code and R is the sense resistor shown in
Figure 12.
Figure 9. Unipolar Rail-to-Rail Output Circuit
Digitally Programmable Current Source
MAX5354
MAX5355
I
OUT
REF
= (V
DAC
in 8-Pin µMAX
REF
/R) x (NB/1024)
+5V/+3.3V
V
DD
GND
FB
OUT
10k
10k
13