Datasheet

ADS62P45, ADS62P44
ADS62P43, ADS62P42
www.ti.com SLAS561C –JULY 2007– REVISED FEBRUARY 2012
POWER DOWN
ADS62P4X has three powerdown modes – power down global, individual channel standby and individual channel
output buffer disable. These can be set using either the serial register bits or using the control pins CTRL1 to
CTRL3.
Table 21. Powerdown Modes
CONFIGURE USING
WAKE-UP
POWERDOWN MODES SERIAL INTERFACE PARALLEL CONTROL PINS
TIME
<POWER DOWN MODES>
CTRL1 CTRL2 CTRL3
Normal operation 000 low low low —
Channel A output buffer disabled 001 low low high Fast (100 ns)
Channel B output buffer disabled 010 low high low Fast (100 ns)
Channel A and B output buffer disabled 011 low high high Fast (100 ns)
Global power down 100 high low low Slow (15 μS)
Channel A standby 101 high low high Fast (100 ns)
Channel B standby 110 high high low Fast (100 ns)
Multiplexed (MUX) mode – Output data of
channel A and B is multiplexed and available 111 high high high —
on DB13 to DB0 pins.
Power Down Global
In this mode, the entire chip including both the A/D converters, internal reference and the output buffers are
powered down resulting in reduced total power dissipation of about 50 mW. The output buffers are in high
impedance state. The wake-up time from the global power down to data becoming valid in normal mode is
typically 15 μs.
Channel Standby (Individual or Both Channels)
This mode allows the individual ADCs to be powered down. The internal references are active and this results in
fast wake-up time, about 100 ns. The total power dissipation in standby is about 482 mW.
Output Buffer Disable (Individual or Both Channels)
Each channel’s output buffer can be disabled and put in high impedance state -- wakeup time from this mode is
fast, about 100 ns.
Input Clock Stop
In addition to the above, the converter enters a low-power mode when the input clock frequency falls below 1
MSPS. The power dissipation is about 140 mW.
POWER SUPPLY SEQUENCE
During power-up, the AVDD and DRVDD supplies can come up in any sequence. The two supplies are
separated in the device. Externally, they can be driven from separate supplies or derived from a single supply.
Copyright © 2007–2012, Texas Instruments Incorporated Submit Documentation Feedback 55
Product Folder Link(s): ADS62P45, ADS62P44 ADS62P43, ADS62P42