MAX5531ETC+ Maxim Integrated Products, MAX5531ETC+ Datasheet - Page 15

• Manufacturer Part Number: MAX5531ETC+
• Description: IC DAC 12BIT SGL ULP 12-TQFN
• Manufacturer: Maxim Integrated Products

Specifications of MAX5531ETC+

• Settling Time: 660µs
• Number Of Bits: 12
• Data Interface: MICROWIRE™, QSPI™, Serial, SPI™
• Number Of Converters: 1
• Voltage Supply Source: Single Supply
• Power Dissipation (max): 1.35mW
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 12-TQFN Exposed Pad
• Number Of Dac Outputs: 1
• Resolution: 12 bit
• Interface Type: Serial (SPI)
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 1.8 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Supply Current: 0.007 mA
• Voltage Reference: Internal
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The MAX5530/MAX5531 feature two power modes to
conserve power during idle periods. In normal opera-
tion, the device is fully operational. In shutdown mode,
the device is completely powered down, including the
internal voltage reference in the MAX5531. The
MAX5531 also offers a standby mode where all circuitry
is powered down except the internal voltage reference.
Standby mode keeps the reference powered up while
the remaining circuitry is shut down, allowing it to be
used as a system reference. Standby mode also helps
reduce the wake-up delay by not requiring the refer-
ence to power up when returning to normal operation.
The MAX5530/MAX5531 feature a software-program-
mable shutdown mode that reduces the typical supply
current and the reference input current to 0.18µA
(max). Writing an input control word with control bits
C[3:0] = 1110 places the device in shutdown mode
(Table 2). In shutdown, the MAX5530 reference input
and DAC output buffers go high impedance. Placing
the MAX5531 into shutdown turns off the internal refer-
ence, and the DAC output buffers go high impedance.
The serial interface remains active for all devices.
Table 2 shows several commands that bring the
MAX5530/MAX5531 back to normal operation. The
power-up time from shutdown is required before the
DAC outputs are valid.
Note: For the MAX5531, standby mode cannot be
entered directly from shutdown mode. The device must
be brought into normal operation before entering stand-
by mode.
Table 3. Reference Output Voltage
Programming
D11
0
0
1
1
D10
0
1
0
1
______________________________________________________________________________________
REFERENCE VOLTAGE (V)
1.214
1.940
2.425
3.885
Power Modes
Shutdown Mode
Ultra-Low-Power, 12-Bit,
The MAX5531 features a software-programmable
standby mode that reduces the typical supply current
to 6µA. Standby mode powers down all circuitry except
the internal voltage reference. Place the device in
standby mode by writing an input control word with
control bits C[3:0] = 1100 (Table 2). The internal refer-
ence and serial interface remain active while the DAC
output buffers go high impedance. If the MAX5531 is
coming out of standby, the power-up time from standby
is required before the DAC outputs are valid.
For the MAX5531, standby mode cannot be entered
directly from shutdown mode. The device must be
brought into normal operation before entering standby
mode. To enter standby from shutdown, issue the com-
mand to return to normal operation, followed immedi-
ately by the command to go into standby.
Table 2 shows several commands that bring the
MAX5531 back to normal operation. When transitioning
from standby mode to normal operation, only the DAC
power-up time is required before the DAC outputs
are valid.
The MAX5530 accepts a reference with a voltage range
extending from 0 to V
represented by a digitally programmable voltage
source as:
where N is the numeric value of the DAC’s binary input
code (0 to 4095), V
gain is the externally set voltage gain for the MAX5530/
MAX5531.
In shutdown mode, the reference input enters a high-
impedance state with an input impedance of 2.5GΩ (typ).
The MAX5531 internal voltage reference is software
configurable to one of four voltages. Upon power-up,
the default reference voltage is 1.214V. Configure the
reference voltage using the D11 and D10 data bits
(Table 3) when the control bits are as follows C[3:0] =
1100, 1101, or 1110 (Table 2). V
minimum of 200mV above V
Voltage-Output DACs
V
OUT
= (V
REF
REF
DD
Standby Mode (MAX5531 Only)
. The output voltage (V
is the reference voltage and
x N / 4096) x gain
REF
for proper operation.
Reference Output
DD
Reference Input
must be kept at a
OUT
) is
15