max5352bmja Maxim Integrated Products, Inc., max5352bmja Datasheet - Page 13

• Manufacturer Part Number: max5352bmja
• Description: Low-power, 12-bit Voltage-output Dacs With Serial Interface
• Manufacturer: Maxim Integrated Products, Inc.

Table 3. Bipolar Code Table
NOTE: ( ) are for sub-bit.
Figure 8. Unipolar Output Circuit
MSB
1 1 1 1 1 1 1 1 11 1 1 ( 0 )
1 0 0 0 0 0 0 0 00 0 1 ( 0 )
1 0 0 0 0 0 0 0 00 0 0 ( 0 )
0 1 1 1 1 1 1 1 11 1 1 ( 0 )
0 0 0 0 0 0 0 0 00 0 1 ( 0 )
0 0 0 0 0 0 0 0 00 0 0 ( 0 )
MAX5352
MAX5353
DAC CONTENTS
LSB
______________________________________________________________________________________
REF
Low-Power, 12-Bit Voltage-Output DACs
DAC
-V
ANALOG OUTPUT
REF
+5V/+3.3V
V
DD
+V
+V
-V
-V
2048
2048
REF
REF
REF
REF
GND
0V
2047
2048
2048
2048
2047
2048
1
1
- V
FB
REF
OUT
The MAX5352’s total harmonic distortion plus noise
(THD+N) is typically less than -77dB (full-scale code),
and the MAX5353’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 fre-
quency 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 cur-
rent 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
MAX5352
MAX5353
with Serial Interface
I
OUT
REF
= (V
DAC
REF
/R) x (NB/4096)
+5V/+3.3V
V
DD
GND
FB
OUT
10k
10k
13