MAX531BCSD+ Maxim Integrated Products, MAX531BCSD+ Datasheet - Page 10

• Manufacturer Part Number: MAX531BCSD+
• Description: IC DAC V-OUT SRL 12BIT 5V 14SOIC
• Manufacturer: Maxim Integrated Products

Specifications of MAX531BCSD+

• Settling Time: 25µs
• Number Of Bits: 12
• Data Interface: Serial
• Number Of Converters: 1
• Voltage Supply Source: Single Supply
• Power Dissipation (max): 667mW
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 14-SOIC (3.9mm Width), 14-SOL
• Number Of Dac Outputs: 1
• Resolution: 12 bit
• Interface Type: Serial (SPI)
• Supply Voltage (max): 5.25 V
• Supply Voltage (min): 4.5 V
• Maximum Operating Temperature: + 70 C
• Mounting Style: SMD/SMT
• Maximum Power Dissipation: 471 mW
• Minimum Operating Temperature: 0 C
• Supply Current: 260 uA
• Voltage Reference: Internal
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The serial output, DOUT, allows cascading of two or
more DACs. The data at DIN appears at DOUT,
delayed by 16 clock cycles plus one clock width. For
low power, DOUT is a CMOS output that does not
require an external pull-up resistor. DOUT does not go
into a high-impedance state when CS is high. DOUT
changes on SCLK’s falling edge when CS is low. When
CS is high, DOUT remains in the state of the last data
bit.
Any number of MAX531/MAX538/MAX539 DACs can
be daisy-chained by connecting the DOUT of one
device to the DIN of the next device in the chain. For
proper timing, ensure that t
greater than t
The MAX531 is configured for a gain of +1 (0V to V
unipolar output) by connecting BIPOFF and RFB to
VOUT (Figure 6). The converter operates from either sin-
gle or dual supplies in this configuration. See Table 1 for
the DAC-latch contents (input) vs. the analog VOUT
(output). In this range, 1LSB = V
MAX538 is internally configured for unipolar gain = +1
operation.
A gain of +2 (0V to 2V
by connecting BIPOFF to AGND and RFB to VOUT
(Figure 7). Table 2 shows the DAC-latch contents vs.
VOUT. The MAX531 operates from either single or dual
+5V, Low-Power, Voltage-Output,
Serial 12-Bit DACs
Figure 3a. MAX531 Typical Operating Circuit
10
33 F
______________________________________________________________________________________
AGND DGND
REFIN
REFOUT
DIN
2.048V
DOUT SCLK
DO
+ t
0.1 F
INVERTED
R-2R DAC
MAX531
DS
V
0.1 F
DD
.
REFIN
V
CS
SS
Daisy-Chaining Devices
Unipolar Configuration
CL
CLR
+5V
0V TO -5V
unipolar output) is set up
(CS low to SCLK high) is
2R
2R
BIPOFF
VOUT
REFIN
RFB
CONNECT BIPOFF
TO VOUT FOR G = 1,
TO AGND FOR G = 2,
OR TO REFIN FOR
BIPOLAR GAIN
(2
-12
). The
REFIN
supplies in this mode. In this range, 1LSB = (2)(V
(2
ured for unipolar gain = +2 operation.
A bipolar range is set up by connecting BIPOFF to
REFIN and RFB to VOUT, and operating from dual
(±5V) supplies (Figure 8). Table 3 shows the DAC-latch
contents (input) vs. VOUT (output). In this range,
1LSB = V
The MAX531 can be used as a four-quadrant multiplier
by connecting BIPOFF to REFIN and RFB to VOUT,
using (1) an offset binary digital code, (2) bipolar power
supplies, using dual power supplies, and (3) a bipolar
analog input at REFIN within the range V
- 2V, as shown in Figure 9.
In general, a 12-bit DAC’s output is (D) (V
where “G” is the gain (+1 or +2) and “D” is the binary
representation of the digital input divided by 2
4096. This formula is precise for unipolar operation.
However, for bipolar, offset binary operation, the MSB is
really a polarity bit. No resolution is lost, as there are
the same number of steps. The output voltage, howev-
er, has been shifted from a range of, for example, 0V to
4.096V (G = +2) to a range of -2.048V to +2.048V.
Keep in mind that when using the DAC as a four-quad-
rant multiplier, the scale is skewed. Negative full scale
is -V
Figure 3b. MAX538/MAX539 Typical Operating Circuit
-12
REFIN
) = (V
REFIN
REFIN
, while positive full scale is +V
REFIN
AGND
(2
MAX538
MAX539
)(2
DIN
0.1 F
-11
-11
Four-Quadrant Multiplication
).
INVERTED
R-2R DAC
SCLK
). The MAX539 is internally config-
V
DD
CS
Bipolar Configuration
2R
DOUT
+5V
MAX539
ONLY
2R
REFIN
SS
+ 2V to V
VOUT
REFIN)
- 1LSB.
REFIN
12
(G),
DD
or
)