AD7856KR-REEL Analog Devices Inc, AD7856KR-REEL Datasheet - Page 19

• Manufacturer Part Number: AD7856KR-REEL
• Description: IC ADC 14BIT 8CH 5V 24-SOIC
• Manufacturer: Analog Devices Inc

Specifications of AD7856KR-REEL

• Rohs Status: RoHS non-compliant
• Number Of Bits: 14
• Sampling Rate (per Second): 285k
• Data Interface: 8051, QSPI™, Serial, SPI™ µP
• Number Of Converters: 2
• Power Dissipation (max): 89.25mW
• Voltage Supply Source: Analog and Digital
• Operating Temperature: 0°C ~ 105°C
• Mounting Type: Surface Mount
• Package / Case: 24-SOIC (0.300", 7.50mm Width)

A combination of hardware and software selection can also be
used to achieve the desired effect.
PMGT1
Bit
0
0
0
1
1
NOTE
HW = Hardware Selection; SW = Software Selection.
REV. A
PMGT0
Bit
0
0
1
0
1
Table VI. Power Management Options
AUTO CAL ON
AUTO POWER
DOWN AFTER
CONVERSION
POWER-UP
SLEEP
Pin
0
1
X
X
X
ANALOG
SUPPLY
CURRENT, I = 12mA TYP
+5V
0V TO 2.5V
Comment
Full Power-Down Between
Conversions (HW/SW)
Full Power-Up (HW/SW)
Normal Operation
(Independent of the SLEEP
Pin)
Full Power-Down (SW)
Partial Power-Down Between
Conversions
0.01 F
INPUT
10 F
0.1 F
0.01 F
Figure 21. Typical Low Power Circuit
0.1 F
REF-192
C
C
AIN(+)
AIN(–)
CAL
AGND
DGND
SLEEP
REF1
REF2
AV
DD
OPTIONAL
EXTERNAL
REFERENCE
REF
AD7856
DV
IN
DD
0.1 F
/REF
–19–
OUT
0.1 F
MASTER CLOCK
INTERNAL
REFERENCE
CONVST
POWER-UP TIMES
Using an External Reference
When the AD7856 is powered up, the part is powered up from
one of two conditions. First, when the power supplies are ini-
tially powered up and, secondly, when the part is powered up
from either a hardware or software power-down (see last section).
When AV
left idle for approximately 42 ms (6 MHz CLK) to allow for the
autocalibration if a 10 nF cap is placed on the CAL pin, (see
Calibration section). During power-up the functionality of the
SLEEP pin is disabled, i.e., the part will not power down until
the end of the calibration if SLEEP is tied logic low. The auto-
calibration on power-up can be disabled if the CAL pin is tied to
a logic high. If the autocalibration is disabled, then the user must
take into account the time required by the AD7856 to power-up
before a self-calibration is carried out. This power-up time is the
time taken for the AD7856 to power up when power is first
applied (300 s) typ) or the time it takes the external reference
to settle to the 14-bit level–whichever is the longer.
CLKIN
SYNC
SCLK
DOUT
INPUT
DIN
4/6MHz OSCILLATOR
DD
SERIAL CLOCK
SERIAL DATA OUTPUT
SERIAL DATA INPUT
and DV
100kHz PULSE GENERATOR
INPUT
DD
CONVERSION
START INPUT
are powered up, the AD7856 should be
LOW POWER
C/ P
AD7856