max5510etct Maxim Integrated Products, Inc., max5510etct Datasheet - Page 14

• Manufacturer Part Number: max5510etct
• Description: +1.8v To +5.5v, Ultra-low-power, 8-bit, Voltage-output Dacs
• Manufacturer: Maxim Integrated Products, Inc.

The MAX5510/MAX5511 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 MAX5511. The
MAX5511 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 MAX5510/MAX5511 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 MAX5510 reference input
and DAC output buffers go high impedance. Placing
the MAX5511 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
MAX5510/MAX5511 back to normal operation. The
power-up time from shutdown is required before the
DAC outputs are valid.
Note: For the MAX5511, standby mode cannot be
entered directly from shutdown mode. The device must
be brought into normal operation before entering stand-
by mode.
The MAX5511 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 MAX5511 is
coming out of standby, the power-up time from standby
is required before the DAC outputs are valid.
For the MAX5511, standby mode cannot be entered
+1.8V to +5.5V, Ultra-Low-Power, 8-Bit,
Voltage-Output DACs
14
______________________________________________________________________________________
Standby Mode (MAX5511 Only)
Power Modes
Shutdown Mode
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 MAX5511
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 MAX5510 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 255), V
is the externally set voltage gain for the MAX5510/
MAX5511.
In shutdown mode, the reference input enters a high-
impedance state with an input impedance of 2.5GΩ (typ).
The MAX5511 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 D6 and D7 data bits (Table
3) when the control bits are as follows: C[3:0] = 1100,
1101, or 1110 (Table 2). V
mum of 200mV above V
Table 3. Reference Output Voltage
Programming
D7
0
0
1
1
V
OUT
D6
0
1
0
1
REF
= (V
DD
is the reference voltage and gain
REF
REF
. The output voltage (V
x N / 256) x gain
DD
for proper operation.
REFERENCE VOLTAGE (V)
must be kept at a mini-
Reference Output
Reference Input
1.214
1.940
2.425
3.885
OUT
) is