MAX5304CUA+ Maxim Integrated Products, MAX5304CUA+ Datasheet - Page 10

• Manufacturer Part Number: MAX5304CUA+
• Description: IC DAC 10BIT LP VOLT OUT 8-UMAX
• Manufacturer: Maxim Integrated Products

Specifications of MAX5304CUA+

• Settling Time: 10µs
• Number Of Bits: 10
• Data Interface: Serial
• Number Of Converters: 1
• Voltage Supply Source: Single Supply
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
• Number Of Dac Outputs: 1
• Resolution: 10 bit
• Interface Type: Serial (SPI)
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 4.5 V
• Maximum Operating Temperature: + 70 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: 0 C
• Supply Current: 400 uA
• Voltage Reference: External
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power Dissipation (max): -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

10-Bit Voltage-Output DAC
in 8-Pin µMAX
Table 3. Bipolar Output Codes
Note: ( ) are for sub-bits.
Figure 8. Unipolar Output Circuit
10
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 )
______________________________________________________________________________________
DAC CONTENTS
REF
DAC
MAX5304
LSB
+5V
V
DD
ANALOG OUTPUT
-V
REF
GND
+V
+V
-V
-V
REF
REF
REF
REF



512
512
0V












512
511
512
512
512
511

 =

FB
OUT
1
1












- V
REF
The MAX5304’s total harmonic distortion plus noise
(THD+N) is typically less than -77dB (full-scale code),
given a 1Vp-p signal swing and input frequencies up to
25kHz. The typical -3dB frequency is 650kHz, as
shown in the Typical Operating Characteristics graphs.
Figure 12’s circuit 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
I
OUT
REF
= (V
DAC
MAX5304
REF
/ R)(NB / 1024)
+5V
V
DD
GND
FB
OUT
10k
10k